DE102018104653A1 - Rotor, asynchronous machine and use of a thrust washer - Google Patents

Abstract

The present invention relates to a rotor for an asynchronous machine comprising a rotor shaft (10), in operation magnetically active rotor elements comprising a lamination stack (11), shorting bars (12) and shorting rings (13, 14), thrust washers (15, 16), between which at least the laminated plate set (11) is arranged, wherein the pressure discs (15, 16) are axially connected to at least one of the rotor elements, and- at least one positive locking element (17), one of the pressure discs (15, 16) and one of the rotor elements connects, between the laminated plate set (11) and the rotor shaft (10) game or a gap (18) is formed, the pressure discs (15, 16) torque-locking with the rotor shaft (10) and the positive-locking element (17) one of the pressure discs (15, 16) and one of the rotor elements for transmitting a torque between the rotor shaft (10) and the rotor elements in the circumferential direction of the rotor shaft (10) connects, wherein the torque is introduced during operation by the rotor elements. Furthermore, the invention relates to an asynchronous machine and the use of a pressure washer.

Description

The invention relates to a rotor, an asynchronous machine and the use of a thrust washer. A rotor according to the preamble of claim 1 is for example made EP 2 149 970 B1 known.

In rotor manufacturing of electric motors, the magnetically active part of the rotor must be mounted on the rotor shaft. Generally, this part of the rotor consists of stacked laminations. In permanent-magnet synchronous machines (PSM) integrated axially permanent magnets are arranged in the stacked laminations. In asynchronous machines (ASM) or induction machines, the stacked laminations have integrated, axially arranged short-circuit bars. It is generally known that for the transmission of torque from the laminations to the rotor shaft of the rotor, radial press connections, for example by shrinking the laminations onto the rotor shaft, are used.

Such a radial press connection is for example from the aforementioned EP 2 149 970 B1 known. In this case, a rotor of an asynchronous machine has a rotor shaft and a rotor lamination stack, which is connected in a rotationally fixed manner to the rotor shaft. The rotor core is laterally closed by pressing plates and bolted to them. Furthermore, the rotor laminated core has slots for receiving short-circuiting rods whose ends are connected to each other by short-circuiting rings. Each press plate is positively connected to the respective short-circuit ring in the tangential direction by complementarily configured formations in the press plate and the short-circuit ring. The press plates thus increase the total weight, thereby achieving an improvement in the natural frequency of the system. The press plates therefore have the function of stabilizing the entire system and reducing the risk of breakage of the short-circuit bars. The torque transmission takes place here by the rotationally fixed connection of the rotor laminated core with the rotor shaft. A disadvantage of radial compression joints for torque transmission is the high mechanical processing effort of the contact surfaces of rotor shaft and rotor core.

Furthermore, from the DE 10 2014 106 614 A1 a rotor shaft with a laminated core known, wherein between the rotor shaft and the laminated core a game is formed. The laminated core is held frictionally by an axial pressure between two seated on the rotor shaft thrust washers. At least one of the pressure plates is connected by a force-positive connection with the rotor shaft. The torque is transmitted exclusively by the frictional press connection between the laminated core and the pressure plates. For the transmission of high torques therefore often additional fasteners in the form of tie rods are used.

In general, the use of axial press connections of laminated cores with pressure disks in rotors for asynchronous machines is difficult to realize because the short-circuit rods are embedded in the radial, outer region of the rotor laminations. Tie rods can therefore not be arranged in the outer area. Furthermore, the attachment of tie rods mechanically and magnetically disadvantageous in the radially inner region of the rotor laminations. Rotors for asynchronous machines with an axial press connection are therefore limited in torque transmission to a defined torque range.

The invention is based on the object to provide a rotor for an asynchronous, which can be used by an improved structure for the transmission of high torques. The invention is further based on the object of specifying an asynchronous machine and the use of a thrust washer.

According to the invention, this object is achieved with regard to the rotor by the subject matter of claim 1. With regard to the asynchronous machine and the use of a pressure washer, the above-mentioned object is achieved in each case by the subject matter of claim 29 (asynchronous machine) and by the subject matter of claim 30 (use).

• - eine Rotorwelle,
• - im Betrieb magnetisch aktive Rotorelemente umfassend ein Blechlamellenpaket, Kurzschlussstäbe und Kurzschlussringe,
• - Druckscheiben, zwischen denen wenigstens das Blechlamellenpaket angeordnet ist, wobei die Druckscheiben mit wenigstens einem der Rotorelemente axial verbunden sind,

wobei wenigstens ein Formschlusselement vorgesehen ist, das eine der Druckscheiben und eines der Rotorelemente verbindet,
wobei zwischen dem Blechlamellenpaket und der Rotorwelle Spiel oder ein Spalt ausgebildet ist. Die Druckscheiben sind drehmomentschlüssig mit der Rotorwelle verbunden. Die Druckscheiben können dabei durch ein Setzverfahren mit vorherigem Rollieren der Rotorwelle mit der Rotorwelle verbunden sein. Das Formschlusselement verbindet eine der Druckscheiben und eines der Rotorelemente zur Übertragung eines Drehmomentes zwischen der Rotorwelle und den Rotorelementen in Umfangsrichtung der Rotorwelle. Das Drehmoment wird im Betrieb durch die Rotorelemente eingeleitet. Die Umfangsrichtung entspricht dabei einer tangentialen Richtung um die Rotorwelle.The invention is based on the idea of specifying a rotor for an asynchronous machine, comprising:

• a rotor shaft,
• in operation, magnetically active rotor elements comprising a laminated plate set, short-circuit bars and short-circuit rings,
• Pressure disks, between which at least the laminated disk set is arranged, the pressure disks being axially connected to at least one of the rotor elements,

wherein at least one positive-locking element is provided, which connects one of the pressure disks and one of the rotor elements,
wherein between the lamination stack and the rotor shaft clearance or a gap is formed. The pressure discs are torque-locked to the rotor shaft. The pressure discs can by a setting method with prior rolling of the rotor shaft with the rotor shaft be connected. The interlocking element connects one of the pressure plates and one of the rotor elements for transmitting a torque between the rotor shaft and the rotor elements in the circumferential direction of the rotor shaft. The torque is introduced during operation by the rotor elements. The circumferential direction corresponds to a tangential direction about the rotor shaft.

In general, short circuit rings are not limited in their training to a ring shape. The shorting rings can have a triangular, rectangular or polygonal geometry shape. Furthermore, the shorting rings may have a circular shape, a circular ring shape or another geometric shape. The short-circuit rings can be formed in one piece, in particular in one piece, or in several parts, in particular in several pieces. In other words, the short-circuit rings may be formed as a single part or composed of a plurality of short-circuit ring sections or a plurality of short-circuit ring elements. The respective short-circuit ring sections can each be integrally formed with a shorting bar. Furthermore, the short-circuit ring sections can be integrally formed with the respective thrust washer, in particular integrally. Likewise, the short-circuit ring sections may be formed as a single, in particular separate, short-circuit ring element.

• Durch die Ausbildung von Spiel oder einem Spalt zwischen dem Blechlamellenpaket und der Rotorwelle liegt das Blechlamellenpaket nicht an einer Umfangsfläche der Rotorwelle an. Im Bereich des Blechlamellenpakets sind daher nur grobe Fertigungstoleranzen der Rotorwelle einzuhalten, wodurch ein mechanischer Bearbeitungsaufwand der Rotorwelle reduziert wird und somit Herstellungskosten eingespart werden. Das Blechlamellenpaket ist ebenso wie die vorstehend genannten Kurzschlussstäbe und Kurzschlussringe im Betrieb ein magnetisch aktives Rotorelement. Das zu übertragende Drehmoment wird dabei im Betrieb durch ein oder mehrere Rotorelemente über Formschlusselemente in Umfangsrichtung der Rotorwelle in die Druckscheiben eingeleitet. Die Drehmomenteinleitung in die Druckscheiben erfolgt daher in tangentialer Richtung um die Rotorwelle. Durch die drehmomentschlüssige Verbindung der Druckscheibe mit der Rotorwelle wird das Drehmoment auf die Rotorwelle übertragen. Mit anderen Worten wird das Drehmoment nicht durch die Rotorelemente direkt auf die Rotorwelle übertragen, sondern indirekt durch die Druckscheiben. Hierbei ermöglicht die formschlüssige Verbindung der Rotorelemente mit den Druckscheiben die drehzahlunabhängige Übertragung hoher Drehmomente von den Rotorelementen auf die Rotorwelle. Somit wird eine ausfallssichere bzw. lösungssichere Verbindung zur Drehmomentübertragung erreicht.

The invention has several advantages:

• Due to the formation of clearance or a gap between the lamination stack and the rotor shaft, the lamination stack does not abut against a circumferential surface of the rotor shaft. In the area of the lamination stack, therefore, only rough manufacturing tolerances of the rotor shaft are to be maintained, as a result of which a mechanical processing effort of the rotor shaft is reduced and thus manufacturing costs are saved. The lamination stack is as well as the aforementioned shorting bars and shorting rings in operation a magnetically active rotor element. The torque to be transmitted is thereby introduced in operation by one or more rotor elements via form-locking elements in the circumferential direction of the rotor shaft in the pressure discs. The introduction of torque into the pressure disks therefore takes place in the tangential direction around the rotor shaft. Due to the torque-locking connection of the thrust washer with the rotor shaft, the torque is transmitted to the rotor shaft. In other words, the torque is not transmitted by the rotor elements directly to the rotor shaft, but indirectly through the pressure plates. In this case, the positive connection of the rotor elements with the pressure plates enables the rotational speed-independent transmission of high torques from the rotor elements to the rotor shaft. Thus, a fail-safe or solution-secure connection for torque transmission is achieved.

The invention has the further advantage that the high expenditure for producing a radial compression connection, in particular torque-locking connection, of the laminated plate package with the rotor shaft is eliminated by the transmission of the torque via the pressure plates and thus manufacturing costs are saved. Furthermore, by reducing fasteners material costs can be saved.

Preferred embodiments of the invention are specified in the subclaims.

In a particularly preferred embodiment, the positive-locking element connects one of the pressure disks and the laminated disk set. The pressure disk is located in the axial direction on the lamination stack. This has the advantage that the pressure disks directly clamp or press the laminations and thus the laminations. A flow of the short-circuiting rings, in particular the copper shorting rings, is thus prevented.

In a preferred embodiment, the positive-locking element connects one of the pressure disks and one of the short-circuiting rings. The pressure disk is located in the axial direction and / or in the radial direction on the short-circuit ring. The axial direction corresponds to a longitudinal direction of the rotor shaft. The radial direction corresponds to a direction perpendicular to the axis of rotation of the rotor shaft. Advantageously, this allows a simple and cost-effective design for transmitting the torque. A contact pressure of the respective thrust washer for clamping or pressing the laminated plate package is dependent on the flow behavior of the shorting rings.

The positive-locking element is preferably arranged on an end face of the pressure disk and extends parallel to the axis of rotation of the rotor shaft. The front side of the thrust washer allows easy accessibility in the processing or production of positive-locking elements, whereby Richtbedarf and manufacturing costs are reduced.

Further preferably, the positive-locking element is formed by a profiled lateral surface of the thrust washer and extends radially to the axis of rotation of the rotor shaft. The profiled lateral surface can be formed on the pressure disk and / or on the associated rotor element, for example on the short-circuit ring. The profiled lateral surface can be corrugated and / or corrugated. This has the advantage of being an improved Torque transmission between the pressure plate and the rotor element is achieved. Furthermore, this enables a direct radial, in particular deflection-free, introduction of the torque to be transmitted from the rotor element into the pressure disk. In other words, this achieves an improved torque conduction from the rotor element to the pressure plate by reducing deflections, thereby enabling the transmission of high torques from the magnetically active rotor element to the rotor shaft.

In a preferred embodiment, the form-locking element forms a pin-like projection or a pin-like recess. The form-fitting element can be formed in and / or on the pressure plate. Furthermore, the positive-locking element can also be formed in and / or on at least one rotor element. The respective form-fitting element extends in the longitudinal direction of the rotor shaft or in the axial direction. This advantageously allows the formation of a groove / spring connection between the pressure plate and the rotor element. As a result, a stable and tight positive connection is achieved. The form-fitting element of the pressure disk and the positive-locking element of the rotor element are arranged directly opposite each other. The form-locking elements of the pressure plate and the rotor element engage each other. The respectively opposite positive-locking elements can be formed complementary to each other. The oppositely disposed positive-locking elements may also have a different shape, in particular a non-complementary to each other, formed shape. In this case, a plastic deformation of one and / or both positive locking elements is made possible by joining the interlocking elements, whereby a non-positive and / or positive connection is formed.

In a further embodiment, the positive-locking element forms a wedge-like projection or a wedge-like recess. The wedge-like projection or the wedge-like recess may be formed in and / or on the pressure plate. Furthermore, the wedge-like projection or the wedge-like recess may be formed in and / or on the rotor element. The respective form-locking element extends in the radial direction inwardly to the rotor shaft or in the radial direction of the rotor shaft to the outside. This advantageously also allows the formation of a groove / spring connection between the pressure plate and the rotor element. As a result, a stable and tight positive connection is achieved. The form-fitting element of the pressure disk and the positive-locking element of the rotor element are arranged directly opposite each other. The form-locking elements of the pressure plate and the rotor element engage each other. The respectively opposite positive-locking elements can be formed complementary to each other. The oppositely disposed positive-locking elements may also have a different shape, in particular a non-complementary to each other, formed shape. In this case, a plastic deformation of one and / or both positive locking elements is made possible by joining the interlocking elements, whereby a non-positive and / or positive connection is formed.

The form-fitting element can form a polygonal profile. The polygonal profile can be formed on a peripheral surface of the pressure plate. Furthermore, the rotor element may have a recess which is designed to be complementary to the polygonal profile of the thrust washer. Advantageously, in this case a positive connection is produced by joining the rotor element to the pressure disk, whereby the transmission of high torques is made possible.

Preferably, the positive-locking element centers the laminated plate set and the rotor shaft. When mounting the rotor, the form-locking element also acts as a centering aid. An exact assembly of the rotor elements and the pressure plate on the rotor shaft is thereby facilitated, whereby an assembly effort and thus manufacturing costs are reduced. The lamination stack is thus easily and quickly aligned or mounted centered to the rotor shaft.

In a particularly preferred embodiment, at least one of the short-circuiting rings is arranged in the axial direction between the lamination stack and one of the pressure disks. In this case, at least one of the thrust washers abut against an axially outer end face of one of the short-circuit rings. This has the advantage that an improved torque line to the rotor shaft is made possible by the simple structure of the positive connection between the short-circuit ring and the pressure plate. The form-locking element designed as a pin-like projection can have an axial inner bore. This has the advantage that the axial inner bore balances radially varying expansions of the thrust washer and the short-circuit ring with different materials of the thrust washer and the short-circuit ring to each other. In this case, a chip-receiving pocket can be formed next to the positive-locking element. When joining the positive-locking element of the short-circuit ring with the positive-locking element of the pressure disk, at least one of the positive-locking elements is plastically or elastically deformed. The bag takes on the deformed material of the positive locking element. The bag forms a material space for receiving the deformed Materials, in particular a chip. It is advantageous that during joining no inadmissible material stresses occur and thus damage to the positive-locking element is prevented.

In a preferred embodiment, at least one of the shorting rings and the associated thrust washer are movable in the axial direction relative to each other. The respective thrust washer rests on the lamination stack, whereby the contact pressure of the thrust washers acts directly in the lamination stack. Thus, an axial interference fit is advantageously produced, can be transmitted through the form-locking elements high torques.

In a further preferred embodiment, the positive-locking element is adapted for an axial relative movement between at least one of the short-circuit rings and the associated thrust washer. This allows a floating mounting of the shorting rings and thus the shorting bars. It is advantageous that thermal stresses are prevented by the axial mobility of the short-circuit rings relative to the pressure plate. Furthermore, it is advantageous that no changing load acts on the associated thrust washer. In this case, a compensation element between the short-circuit ring and the pressure plate to compensate for the axial relative movement can be arranged. The compensating element may comprise a spring element which acts on the short-circuit ring with a spring force acting in the axial direction. This has the advantage that the spring element in an axial movement of the short-circuit ring on the one hand receives controlled and on the other hand increases the spring force on the short-circuit ring. Thus, a controlled axial relative movement of the short-circuit ring is made possible.

Preferably, the shorting bars are passed through at least one of the pressure plates, wherein the shorting bars and the pressure plate are relatively movable in the axial direction. Advantageously, damage to the pressure disks can thus be prevented by thermal expansion of the short-circuiting rods.

Further preferably, at least one of the pressure plates is arranged in the axial direction between the lamination packet and one of the short-circuit rings. This allows a compact design due to a component-integrated design of the pressure plate with the associated short-circuit ring. At least one of the thrust washers may have a reinforcing ring which holds the associated short-circuit ring radially outward. Advantageously, in this case, the centrifugal forces occurring during operation are absorbed at the short-circuit ring by the reinforcing ring and introduced directly into the pressure disk. The short-circuit bars are thus relieved. Furthermore, at least one of the pressure disks may have an annular undercut which holds the associated short-circuit ring radially inward. In this case, as well as the centrifugal forces occurring at the short-circuit ring are introduced directly into the pressure plate by the undercut and thereby relieved the short-circuit bars.

• - eine Rotorwelle,
• - im Betrieb magnetisch aktive Rotorelemente umfassend ein Blechlamellenpaket (11), Kurzschlussstäbe (12) und Kurzschlussringe (13, 14),
• - Druckscheiben (15, 16), zwischen denen wenigstens das Blechlamellenpaket (11) angeordnet ist, wobei die Druckscheiben (15, 16) mit wenigstens einem der Rotorelemente axial verbunden sind,

wobei
die Druckscheiben (15, 16) und die Kurzschlussringe (13, 14) einstückig miteinander ausgebildet sind und drehmomentschlüssig mit der Rotorwelle (10) verbunden sind und zur Übertragung eines Drehmomentes zwischen der Rotorwelle (10) und dem Blechlamellenpaket (11) und/oder den Kurzschlussstäben (12) in Umfangsrichtung der Rotorwelle (10) verbindet.Further, the object of the invention is achieved by a rotor for an asynchronous machine, comprising:

• a rotor shaft,
• in operation, magnetically active rotor elements comprising a lamination stack ( 11 ), Short-circuit bars ( 12 ) and shorting rings ( 13 . 14 )
• - pressure discs ( 15 . 16 ), between which at least the laminated plate package ( 11 ), wherein the pressure discs ( 15 . 16 ) are axially connected to at least one of the rotor elements,

in which
the pressure discs ( 15 . 16 ) and the short-circuit rings ( 13 . 14 ) are integrally formed with each other and torque-locking with the rotor shaft ( 10 ) and for transmitting a torque between the rotor shaft ( 10 ) and the lamination stack ( 11 ) and / or the short-circuit bars ( 12 ) in the circumferential direction of the rotor shaft ( 10 ) connects.

Due to the one-piece design of the pressure plates with the associated short-circuit ring a very high torque transmission is ensured and also allows a simple construction of the rotor. The one-piece design material and manufacturing costs are reduced. Furthermore, an assembly is advantageously facilitated by the component reduction and weight saved.

In one embodiment, at least one of the pressure disks has a balancing element. The pressure plates have in this case by the balancing element on a dual function, which is simplified by reducing the component by the elimination of additional balancing elements, the structure of the rotor and manufacturing costs are reduced.

The thrust washer and the short-circuiting ring can be relatively movably connected in the axial direction by at least one elastic connecting element. It can be formed between the thrust washer and the short-circuit ring an annular gap. Elastic connecting elements in the form of webs can bridge the annular gap and connect the thrust washer and the short-circuit ring in the axial direction relatively movable. The webs may be formed s-shaped. Due to the elastic connecting elements, an expansion of the short-circuiting rods in the axial direction is made possible. The connecting elements allow an axial offset of the short-circuit ring to the pressure plate. Advantageously, the short-circuit ring builds a counter-clamping force, in particular a spring force, when the short-circuit bars expand.

In a further preferred embodiment, the elastic connecting element has a region with a material weakening between the pressure disk and the short-circuit ring, which is elastically deformable in the axial direction. The material weakening region may include a circumferential groove extending axially between the thrust washer and the shorting ring. Due to the elastic connecting elements occurring thermal stresses are compensated by an expansion of the short-circuit bars in the axial direction. The connecting elements thereby allow an axial offset, in particular a tilting offset, of the short-circuit ring to the pressure plate. Advantageously, the short-circuit ring builds a counter-clamping force, in particular a spring force, when the short-circuit bars expand.

In the various embodiments of the invention, it is conceivable and possible to represent the pressure plates, the laminations of the laminations and the short-circuit rings made of optimized materials for each purpose. In particular, the pressure plates made of steel and the short-circuited rings of copper or aluminum alloys and the plates of the lamination plate packs can be made of an electrical steel. The components can also be encapsulated with a plastic. In particular, a short-circuit ring with a thrust washer can be connected to one another in each case by such an encapsulation to form a one-piece design. Alternatively, if thrust washer and short-circuit ring are made of different materials, it is possible to surround or shed a thrust washer with a short-circuit ring.

An additional aspect of the invention relates to an asynchronous machine with a rotor of the aforementioned type.

Another additional aspect of the invention relates to the use of at least one pressure disk for a rotor of an asynchronous machine together with at least one form-locking element acting in the circumferential direction of the pressure plate for transmitting a torque between a rotor shaft and magnetically active rotor elements of the asynchronous machine in the circumferential direction of the rotor shaft.

Preferably, the rotor comprises a built rotor or a cast rotor.

With regard to the advantages of using a pressure disk according to the invention for a rotor of an asynchronous machine, reference is made to the advantages explained in connection with the rotor. In addition, the use may alternatively or additionally comprise a single or a combination of several features mentioned above with respect to the rotor.

The invention will be explained in more detail below with further details with reference to the accompanying drawings. The illustrated embodiments illustrate examples of how the rotor according to the invention can be configured.

• 1 eine Vorderansicht eines Blechlamellenpakets nach einem erfindungsgemäßen Ausführungsbeispiel;
• 2a einen Längsschnitt eines Rotors mit innenliegenden Kurzschlussringen nach einem bevorzugten erfindungsgemäßen Ausführungsbeispiel;
• 2b einen Detailansicht eines Längsschnittes eines Formschlusselementes des Rotors nach 2a;
• 3 eine Reihenfolge zur Montage des Rotors nach 2a und 2b;
• 4a eine Teilansicht eines Längsschnittes des Rotors nach 2a und 2b;
• 4b eine Teilansicht eines Längsschnittes eines Rotors mit einem innenliegenden Kurzschlussring und einem Ausgleichelement nach einem erfindungsgemäßen Ausführungsbeispiel;
• 4c eine Teilansicht eines Längsschnittes eines Rotors mit einem innenliegenden Kurzschlussring und einem Ausgleichelement nach einem weiteren erfindungsgemäßen Ausführungsbeispiel;
• 4d eine Teilansicht eines Längsschnittes eines Rotors mit einem außenliegenden Kurzschlussring nach einem erfindungsgemäßen Ausführungsbeispiel;
• 4e eine Teilansicht eines Längsschnittes eines Rotors mit einem außenliegenden Kurzschlussring nach einem weiteren erfindungsgemäßen Ausführungsbeispiel;
• 4f eine Teilansicht eines Längsschnittes eines Rotors, bei dem ein Kurzschlussring und eine Druckscheibe einstückig ausgebildet sind, nach einem erfindungsgemäßen Ausführungsbeispiel;
• 4g eine Teilansicht eines Längsschnittes eines Rotors, bei dem ein Kurzschlussring und eine Druckscheibe einstückig ausgebildet sind, nach einem weiteren erfindungsgemäßen Ausführungsbeispiel;
• 4h eine Teilansicht eines Längsschnittes eines Rotors, bei dem ein Kurzschlussring und eine Druckscheibe einstückig ausgebildet sind, nach einem weiteren erfindungsgemäßen Ausführungsbeispiel;
• 5 eine Vorderansicht einer Druckscheibe mit Durchgangsöffnungen zur Aufnahme von Kurzschlussstäben nach einem erfindungsgemäßen Ausführungsbeispiel;
• 6 eine Vorderansicht einer Druckscheibe und eines Kurzschlussrings des Rotors nach 4d nach einem erfindungsgemäßen Ausführungsbeispiel;
• 7a eine Vorderansicht einer Druckscheibe mit radial ausgebildeten Formschlusselementen nach einem erfindungsgemäßen Ausführungsbeispiel;
• 7b eine Vorderansicht eines Kurzschlussrings mit radial ausgebildeten Formschlusselementen nach einem erfindungsgemäßen Ausführungsbeispiel, und
• 8 eine Vorderansicht eines Kurzschlussringes und einer Druckscheibe, die einstückig ausgebildet und durch elastische Verbindungselemente verbunden sind, nach einem erfindungsgemäßen Ausführungsbeispiel;

In these show

• 1 a front view of a lamination stack according to an embodiment of the invention;
• 2a a longitudinal section of a rotor with inner short-circuited rings according to a preferred embodiment of the invention;
• 2 B a detailed view of a longitudinal section of a positive connection element of the rotor after 2a ;
• 3 an order for mounting the rotor after 2a and 2 B ;
• 4a a partial view of a longitudinal section of the rotor after 2a and 2 B ;
• 4b a partial view of a longitudinal section of a rotor with an inner short-circuit ring and a compensating element according to an embodiment of the invention;
• 4c a partial view of a longitudinal section of a rotor with an inner short-circuit ring and a compensation element according to a further embodiment of the invention;
• 4d a partial view of a longitudinal section of a rotor with an external short-circuit ring according to an embodiment of the invention;
• 4e a partial view of a longitudinal section of a rotor with an outer short-circuit ring according to another embodiment of the invention;
• 4f a partial view of a longitudinal section of a rotor, in which a short-circuit ring and a thrust washer are integrally formed, according to an embodiment of the invention;
• 4g a partial view of a longitudinal section of a rotor in which a short-circuit ring and a thrust washer are integrally formed, according to a further embodiment of the invention;
• 4h a partial view of a longitudinal section of a rotor in which a short-circuit ring and a thrust washer are integrally formed, according to a further embodiment of the invention;
• 5 a front view of a thrust washer with through holes for receiving short-circuiting rods according to an embodiment of the invention;
• 6 a front view of a thrust washer and a shorting ring of the rotor after 4d according to an embodiment of the invention;
• 7a a front view of a thrust washer with radially formed positive locking elements according to an embodiment of the invention;
• 7b a front view of a short-circuit ring with radially shaped positive-locking elements according to an embodiment of the invention, and
• 8th a front view of a short-circuit ring and a pressure washer, which are integrally formed and connected by elastic connecting elements, according to an embodiment of the invention;

1 shows a front view of a lamination stack 11 which is formed of a plurality of individual laminations. The lamellar package 11 has a central passage opening. According to 1 the central passage opening is circular. The central passage opening can also have a different geometric shape, for example a polygonal shape or a freeform.

Furthermore, each lamination of the lamination stack 11 in an outer surface area a plurality of further passage openings for receiving short-circuit bars 12 on. The further passage openings are formed by grooves which have an elongated shape. The grooves may also have a different geometric shape and / or a free form. The grooves are formed in the respective lamination, the central passage opening radially encircling. The grooves are evenly distributed around the central passage opening arranged. The grooves can also be arranged differently, in particular bundled, distributed around the central passage opening of the respective lamination. The laminations of the laminations 11 are stacked together so that the central passage opening and the grooves of the laminations are arranged in alignment with each other.

According to 2a a longitudinal section of a rotor is shown. The rotor comprises a rotor shaft 10 , two pressure discs 15 . 16 and a sheet metal laminate package 11 according to 1 , Furthermore, the rotor has a short circuit cage. The short-circuit cage is characterized by several short-circuit bars 12 and two shorting rings 13 . 14 educated.

The short-circuit cage is integral, in particular formed from a cast. The short-circuit cage can also be designed in several parts, in particular several pieces. The shorting bars 12 are in grooves of the sheet metal laminate package 11 embedded and extend through the entire laminated plate package 11 , In each case a short-circuit ring 13 . 14 of the short-circuit cage is at each end face of the lamination stack 11 arranged. The short-circuit ring 13 . 14 lies with an inside directly on the lamella packet 11 on. The inside of the shorting ring 13 . 14 is the sheet metal plate package 11 in the axial longitudinal direction of the rotor shaft 10 facing. The respective short-circuit ring 13 . 14 limits the lamination stack 11 laterally in the longitudinal direction of the rotor shaft 10 ,

The lamellar package 11 and the rotor shaft 10 are arranged coaxially with each other, wherein the lamination stack 11 on the rotor shaft 10 is deferred. Between the central passage opening of the lamination stack 11 and the rotor shaft 10 is game or a gap eighteen , in particular an air gap formed.

Likewise, the short-circuit ring 13 . 14 coaxial to the rotor shaft 10 arranged. In this case, the central passage opening of the short-circuit ring 13 . 14 larger than an outer diameter of the rotor shaft 10 educated. Between an inner surface of the central passage opening of the short-circuit ring 13 . 14 and an outer surface of the rotor shaft 10 is also a clearance or gap, in particular an air gap formed.

The short-circuit rings 13 . 14 each have on one outer side a plurality of positive locking elements 17 on. The positive locking elements 17 extend parallel to the axis of rotation of the rotor shaft 10 , The outside of the shorting ring 13 . 14 is the sheet metal plate package 11 in the axial longitudinal direction of the rotor shaft 10 away. The positive locking elements 17 have a rectangular longitudinal cross-sectional shape. For example, the positive-locking elements 17 therefore cylindrical, rectangular or triangular shaped. The positive locking elements 17 may also have a different cross-sectional shape, for example. An L-shape or a C-shape.

The pressure discs 15 . 16 each have a central passage opening. Furthermore, each includes a thrust washer 15 . 16 Form-fitting elements 17 at one end of the thrust washer 15 . 16 are arranged. The positive locking elements 17 the pressure disk 15 . 16 are the positive-locking elements 17 of the respective short-circuit ring 13 . 14 formed complementary. The respective opposite form-fitting elements 17 can also have a different, in particular a non-complementary to each other, formed shape. The positive locking elements 17 connect the thrust washer 15 . 16 and the shorting ring 13 . 14 , where the pressure disk 15 . 16 in the axial longitudinal direction of the rotor shaft 10 at the short-circuit ring 13 . 14 is applied. The pressure disc 15 . 16 is with the shorting ring 13 . 14 through the positive-locking elements 17 for transmitting the torque in the circumferential direction of the rotor shaft 10 positively, in particular rotatably connected.

The pressure disc 15 . 16 has a material reduction from the central passage opening radially outward. As a result, the centrifugal forces occurring during operation are reduced and the service life of the rotor is increased. Furthermore, thereby the radial forces occurring on the positive-locking elements 17 reduced. The pressure disc 15 . 16 may also have other and / or additional centrifugal force reducing structural features to reduce the centrifugal forces occurring. The respective pressure disc 15 . 16 is with the rotor shaft 10 connected torque-locking. The torque-locking connection may be formed positively and / or non-positively. The respective pressure disc 15 . 16 Can also be used with the rotor shaft 10 be connected cohesively. Furthermore, to connect the respective thrust washer 15 . 16 with the rotor shaft 10 a combination of the aforementioned types of connection conceivable.

As in 2a shown are the shorting rings 13 . 14 in the axial direction between the pressure discs 15 . 16 and the lamination pack 11 arranged. The axial direction corresponds to the longitudinal direction of the rotor shaft 10 , The pressure discs 15 . 16 be on the rotor shaft 10 pressed on and on the short-circuit rings 13 . 14 pressed. The Kurschlussringe 13 . 14 and the lamellar package 11 are between the pressure discs 15 . 16 clamped or clamped. This creates an axial press connection between the pressure disks 15 . 16 , the short rings 13 . 14 and the sheet metal laminate package 11 , The order of assembly will be discussed later.

The torque to be transmitted is from the short-circuit bars 12 over the positive-locking elements 17 the shorting rings 13 . 14 in the pressure discs 15 . 16 initiated. Through the pressure discs 15 . 16 the torque is applied to the rotor shaft 10 transfer.

2 B shows a positive connection of the form-fitting elements 17 according to 2a , The form-locking element 17 of the short-circuit ring 13 has a material recess at a base of the positive-locking element 17 on. The Materialausnehmung is by a spanaufnehmende pocket 20 educated.

The pocket 20 extends along the positive-locking element 17 in the short-circuit ring 13 in the axial longitudinal direction of the rotor shaft 10 , The pocket 20 can in the short-circuit ring 13 the positive-locking element 17 be formed completely circumferentially or sections circumferentially. The pocket 20 is next to the positive locking element 17 educated. The pocket 20 can also be the positive connection element 17 Sectionally undercutting in the short-circuit ring 13 be educated.

When joining the positive-locking element 17 of the short-circuit ring 13 with the positive-locking element 17 the pressure disk 15 becomes at least one positive locking element 17 plastically or elastically deformed. The pocket 20 takes the deformed material, such as chips, the positive-locking element 17 on. The pocket 20 forms a material space for receiving the deformed material. It is advantageous that during joining no inadmissible material stresses occur and thus damage to the positive-locking element is prevented. Furthermore, a press connection between the positive-locking elements is thereby produced.

As in 2 B shown, forms the positive connection element 17 of the short-circuit ring 13 a pin-like projection and the positive locking element 17 the pressure disk 15 a pin-like recess. In the assembled state form the positive locking elements 17 a tongue and groove connection between the thrust washer 15 and the shorting ring 13 , The form-locking element 17 the pressure disk 15 and the positive-locking element 17 of the short-circuit ring 13 are arranged directly opposite each other. The positive locking elements 17 the pressure disk 15 and the shorting ring 13 can be arranged coaxially with each other. This sets a rotationally symmetrical design of the form-fitting elements 17 ahead.

As in 2 B clearly recognizable, the interlocking elements grip 17 the pressure disk 15 and the shorting ring 13 each other. The respective opposite form-fitting elements 17 can be complementary to each other. The respective opposite form-fitting elements 17 can also have a different, in particular a non-complementary to each other, formed shape.

When joining the positive-locking element 17 of the short-circuit ring 13 with the positive-locking element 17 the pressure disk 15 may be a plastic deformation of one and / or both positive locking elements 17 respectively. The short-circuit ring 13 is with the pressure disc 15 non-positively and / or positively connected. The positive locking elements 17 the pressure disk 16 and the shorting ring 14 as well as their connection are identical to the positive locking elements described above 17 the pressure disk 15 and the shorting ring 13 educated.

According to 3 is shown an order of the assembly steps in the assembly of a rotor according to the invention. The rotor components, as in 1 to 2 B described above, on a rotor shaft 10 assembled. In a first assembly step, the pressure plate 15 by joining with the rotor shaft 10 connected torque-locking. In a second assembly step, the lamination stack 11 through the positive-locking elements 17 of the short-circuit ring 13 with the pressure disk 15 connected positively and / or non-positively in the circumferential direction of the rotor shaft. The positive locking elements 17 center the laminations 11 and the rotor shaft 10 , In other words, the lamellar package 11 and the rotor shaft 10 thereby centered aligned with each other. In a third assembly step then the thrust washer 16 through the positive-locking elements 17 in the circumferential direction of the rotor shaft with the short-circuit ring 14 positively and / or non-positively connected. At the same time the pressure disk becomes 16 with the rotor shaft 10 connected torque-locking. The pressure disc 16 thereby presses the short-circuit ring 14 . 16 and the lamellar package 11 against the face of the pressure disk 17 , Thus, an axial press connection, in which the pressure plates 15 . 16 the shorting rings 13 . 14 against the lamination pack 11 press. The assembly is not limited to the order described above. The rotor components can also be applied to the rotor shaft in a different order 10 to be assembled.

In the following description of the 4a to 4f is the formation of the lamination stack 11 as well as its arrangement on the rotor shaft 10 identical to the lamella package 11 according to 1 . 2a and 3 , Furthermore, the non-rotatable or torque-locking connection of the pressure plate corresponds 15 with the rotor shaft 10 , as in 2a described, the rotationally fixed connection of the pressure plate 15 with the rotor shaft 10 according to 4a to 4h , Furthermore, the following description corresponds to 4a to 4h in relation to the thrust washer 15 and the shorting ring 13 the description of the pressure washer 16 and the shorting ring 14 , For example, this relates to the configurations and the arrangements of the thrust washer 15 and the shorting ring 13 and the curves of the torques to be transmitted from the short-circuit bars 12 over the short-circuit ring 13 and the pressure disc 15 on the rotor shaft 10 ,

4a to 4c each show a rotor with a short-circuit ring 13 which is in the axial direction within the thrust washer 15 is arranged. In other words, the short-circuit ring 13 between the pressure disc 15 and the lamination pack 11 arranged. In 4a is a partial view of a longitudinal section of the rotor according to 2a as described above. The torque is in this case of the short-circuit bars 12 over the positive-locking elements 17 of the short-circuit ring 13 into the pressure disk 15 initiated. Through the pressure disc 15 the torque is applied to the rotor shaft 10 transfer.

4b shows a partial view of a rotor, in which the short-circuit bars 12 and a short-circuit ring 13 are formed separately. The short-circuit ring 13 is designed as a separate rotor element. The short-circuit ring 13 has passage openings for receiving the short-circuit bars 12 on. The short-circuit ring 13 is with the respective shorting bar 12 rotatably connected. The non-rotatable connection can be formed positively and / or non-positively and / or cohesively.

The pressure disc 15 has a form-locking element 17 on, by a profiled lateral surface of the thrust washer 15 is formed and radially to the axis of rotation of the rotor shaft 10 extends. The short-circuit ring 13 has a central passage opening, which has a complementary profile surface to the profiled lateral surface of the thrust washer 15 forms. The form-locking element 17 can form a polygon profile. The short-circuit ring 13 and the pressure disc 15 are positively connected, in particular rotatably connected to each other. The form-locking element 17 connects the pressure plate 15 and the lamellar package 11 , where the pressure disk 15 in the axial direction on the lamination stack 11 is applied. The torque transmission takes place as in 4a described above.

The short-circuit rings 13 and the pressure disc 15 are movable in the axial direction relative to each other. The form-locking element 17 is for an axial relative movement between the short-circuit ring 13 and the pressure disc 15 customized. Of Another is a compensation element 21 between the short-circuit ring 13 and the pressure disc 15 arranged to compensate for the axial relative movement. The compensation element 21 includes a spring element that the short-circuit ring 13 acted upon by a spring force acting in the axial direction. The pressure disc 15 has a web on which rests the spring element. The web forms a counter-pressure surface of the spring element. For an axial movement of the short-circuit ring 13 the spring element is against the counter-pressure surface of the pressure plate 15 deformed and thus increases the spring force.

According to 4b is the torque from the short-circuit bars 12 via the non-rotatable connection of the short-circuit bars 12 with the short-circuit ring 13 and over the profiled lateral surface in the pressure disk 15 introduced radially. Through the pressure disc 15 then the torque is applied to the rotor shaft 10 transfer.

The rotor according to 4c differs from the rotor according to 4b in that the shorting bars 12 through the pressure disk 15 are guided, with the shorting bars 12 and the pressure disc 15 are relatively movable in the axial direction. Between the respective shorting bar 12 and the pressure disc 15 is formed a gap or game. The shorting bars 12 can in this case by the compensation element 21 be guided. It may also be a gap or clearance between the respective shorting bar 12 and the compensation element 21 be educated. The compensation element 21 can also be designed such that this between the short-circuit bars 12 is arranged in between.

Furthermore, the thrust washer 15 Form-fitting elements 17 on, at the front of the thrust washer 15 are formed and in the axial longitudinal direction of the rotor shaft 10 extend. The positive locking elements 17 connect the thrust washer 15 and the lamellar package 11 , where the pressure disk 15 in the axial direction on the lamination stack 11 is applied. The positive locking elements 17 can like the positive locking element 17 according to the 2a and 2 B be educated. The positive locking elements 17 but may also be designed differently and / or differently oriented. The torque transmission takes place as in 4a described above. A part of the torque to be transmitted can also via the positive-locking elements 17 on the front side of the thrust washer 15 on the rotor shaft 10 be transmitted.

4d and 4e each show a rotor with a short-circuit ring 13 , outside the pressure washer 15 in the axial opposite direction to the lamination stack 11 is arranged. The pressure disc 15 is in the axial direction between the lamination stack 11 and the shorting ring 13 arranged. The rotor according to 4d and 4e can tangential positive locking elements 17 include on the in 6 will be discussed later.

4d shows a partial view of a rotor, in which the short-circuit bars 12 and a short-circuit ring 13 are formed separately. The short-circuit ring 13 is designed as a separate rotor element. The short-circuit ring 13 has passage openings for receiving the short-circuit bars 12 on. The short-circuit ring 13 is with the respective shorting bar 12 rotatably connected. The non-rotatable connection can be formed positively and / or non-positively and / or cohesively.

The pressure disc 15 has a form-locking element 17 on, by a profiled lateral surface of the thrust washer 15 is formed and radially to the axis of rotation of the rotor shaft 10 extends. The short-circuit ring 13 has a central passage opening, which has a complementary profile surface to the profiled lateral surface of the thrust washer 15 forms. The form-locking element 17 can form a polygon profile. The short-circuit ring 13 and the pressure disc 15 are positively connected, in particular rotatably connected to each other. The form-locking element 17 connects the pressure plate 15 and the lamellar package 11 , where the pressure disk 15 in the axial direction on the lamination stack 11 is applied.

The short-circuit rings 13 and the pressure disc 15 are movable in the axial direction relative to each other. The form-locking element 17 is here for an axial relative movement between the short-circuit ring 13 and the pressure disc 15 customized.

The pressure disc 15 according to 4d has at least one balancing element on an outer side surface. The balancing element can be formed by a balancing mark in the form of a balancing bore. The balancing element can also be formed by a balancing groove or a balancing groove. The pressure disc 15 can also have balancing elements that are formed by another shape. As in 4d clearly recognizable, the pressure plate points 15 Further, a reinforcing ring 22 on, the shorting ring 13 holds radially outward. The reinforcement ring 22 can the pressure disk 15 and / or the shorting ring 13 Completely or partially radially enclose the outer circumference. The reinforcement ring 22 can be formed by a reinforcing ring. During operation occurring centrifugal forces of the short-circuit ring 13 be through the reinforcement ring 22 taken and directly into the pressure disk 15 initiated. The shorting bars 12 be relieved thereby. The Torque transmission occurs as in 4a described above.

The rotor according to 4e differs from the rotor according to 4d just in that the pressure washer 15 has an annular undercut, which is the short-circuit ring 13 holds radially inward. The undercut can be formed by a circumferential groove. Furthermore, a short-circuit ring 13 a bridge on the undercut of the pressure disc 15 is formed complementary. The bridge of the Kurschlussrings 13 and the undercut of the thrust washer 15 form a positive connection. In this case, the centrifugal forces occurring in the operation of the rotor in the short-circuit ring 13 directly into the pressure disc 15 initiated and thus the shorting bars 12 relieved. Furthermore, the thrust washer 15 Form-fitting elements 17 on, like in 4c described trained or arranged. The torque transmission takes place as in 4a described above. A part of the torque can also be via the positive-locking elements 17 on the front side of the thrust washer 15 on the rotor shaft 10 be transmitted.

4f to 4h each show a rotor, in which the thrust washer 15 and the short-circuit ring 13 are integrally formed. The short-circuit ring 13 has passage openings for receiving the short-circuit bars 12 on. The short-circuit ring 13 is with the respective shorting bar 12 rotatably connected. The non-rotatable connection can be formed positively and / or non-positively and / or cohesively. The pressure disc 15 and the short-circuit ring 13 are doing by one or more elastic fasteners 24 relatively movably connected in the axial direction. Therefore, due to temperature changes in the operation of the rotor thermal expansion of the short-circuit bars 12 This is achieved by the elastic fasteners 24 compensated. Furthermore, the thrust washer 15 according to 4f to 4h Form-fitting elements 17 on, at the front of the thrust washer 15 are formed and in the axial longitudinal direction of the rotor shaft 10 extend. The design and arrangement of the positive locking elements 17 corresponds to the in 4c described training and arrangement of positive-locking elements 17 , In this case, a part of the torque to be transmitted via the on the front side of the pressure plate 15 formed positive-locking elements 17 on the rotor shaft 10 be transmitted.

As in 4f shown is the shorting ring 13 radially on the outside of the thrust washer 15 educated. The short-circuit ring 13 lies with an internally arranged end face on the lamination stack 11 in the axial direction. The short-circuit ring 13 Also, there may be a gap or clearance between the inside end face and the lamination pack 11 in the axial direction. Furthermore, the thrust washer is located 15 directly on the sheet metal plate package 11 on.

Between the short-circuit ring 13 and the pressure disc 15 is further an annular gap 25 educated. This bridge the elastic connecting elements 24 in the form of webs 26 the annular gap 25 , The bridges 26 connect the thrust washer 15 and the shorting ring 13 relatively movable in the axial direction. On the execution of a connection of the shorting ring 13 and the pressure disc 15 through bars 26 in the above-mentioned type is in the description of the 8th discussed later.

According to 4f is the torque from the short-circuit bars 12 over the short-circuit ring 13 through the bridges 26 into the pressure disk 15 introduced and then from the pressure plate 15 on the rotor shaft 10 transfer.

In 4g and 4h in each case a rotor is shown in which a short-circuit ring 13 outside the pressure plate 15 in the axial opposite direction to the lamination stack 11 is arranged. The pressure disc 15 is between the short-circuit ring 13 and the lamination pack 11 arranged. The pressure disc 15 is located on the lamination stack 11 in the axial direction. The respective elastic connecting elements 24 according to 4g and 4h have an area with a material weakening 27 between the pressure disc 15 and the shorting ring 13 on, which is elastically deformable in the axial direction. The area with the material weakening 27 includes a circumferential groove 28 extending in the axial direction between the thrust washer 15 and the shorting ring 13 extends. The material weakening 27 can also sections radially and / or axially between the short-circuit ring 13 and the pressure disc 15 be educated.

According to 4g is the material weakening 27 between the short-circuit ring 13 and the pressure disc 15 educated. The material weakening 27 is L-shaped, with a longitudinal leg of the material weakening 27 from a circumference of the shorting ring 13 extends radially inward. The longitudinal leg of the material weakening can be designed to be radially circumferential. A short leg of the L-shaped material weakening 27 extends in the axial direction outward from the pressure plate 15 in the short-circuit ring 13 , The short leg of material weakening 27 is through the circumferential groove 28 educated. The circumferential groove 28 limits the elastic connecting element 24 , The circumferential groove 28 forms an axial material constriction of the short-circuit ring 13 , The material weakening 27 is integral between the thrust washer 15 and the shorting ring 13 educated.

In 4h is a material weakening 27 shown at the circumferential groove 28 is formed open in the axial direction to the outside. The circumferential groove 28 extends from an outer end face of the short-circuit ring 13 in the axial direction to the thrust washer 15 , The circumferential groove 28 extends in the axial direction in the short-circuit ring 13 , The circumferential groove 28 is thus arranged externally in the axial direction. Between the short-circuit ring 13 and the pressure disc 15 is another material weakening 27 formed, extending from a perimeter of the shorting ring 13 extends radially inward. The circumferential groove 28 and the further material weakening 27 limit the elastic connecting element 24 ,

According to 5 is a front view of a thrust washer 15 . 16 shown with multiple through holes. The passage openings are by positive locking elements 17 educated. The positive locking elements 17 are each diamond-shaped. The positive locking elements 17 can also be triangular, rectangular or substantially round. The positive locking elements 17 can be identical. Likewise, the interlocking elements 17 be formed differently from each other. The pressure disc 15 . 16 has a central passage opening for receiving a rotor shaft 10 on. The positive locking elements 17 are the central passage opening radially circumferentially in the pressure plate 15 . 16 educated.

In 6 is a pressure washer 15 . 16 and a short-circuit ring 13 . 14 according to 4d shown. The pressure disc 15 . 16 and the short-circuit ring 13 . 14 has in each case positive-locking elements 17 on, which form a wedge-like projection or a wedge-like recess. The positive locking elements 17 the pressure disk 15 . 16 and the positive-locking elements 17 of the short circuit ring 13 . 14 are each formed complementary to each other. To transmit the torque, the interlocking elements engage 17 the pressure disk 15 . 16 and the shorting ring 13 . 14 each other. The positive locking elements 17 the pressure disk 15 . 16 and the shorting ring 13 . 14 are tangentially, in particular arranged on the outside. In other words, the form-locking elements 17 the pressure disk 15 . 16 and the shorting ring 13 . 14 radially in the direction of the axis of rotation of the rotor shaft 10 educated. The positive locking elements 17 can also be formed parallel to each other or arranged differently.

The pressure disc 15 . 16 according to 6 has on a front side balancing elements, as in 4d described above.

7a shows a pressure washer 15 . 16 with a central passage opening for receiving a rotor shaft 10 and grooves for receiving short-circuit bars 12 , The grooves are the central through hole radially circumferentially in the pressure plate 15 . 16 educated. The design of the grooves corresponds to the in 1 above-described grooves of the laminations.

The pressure disc 15 . 16 has around the central passage opening positive locking elements 17 on, by a profiled lateral surface of the thrust washer 15 are formed. 7a shows a cross-sectional profile of the profiled lateral surface. The profiled lateral surface is as in 4b and 4d described trained or arranged.

7b shows a short-circuit ring 13 . 14 with grooves for receiving short circuit bars 12 , The grooves are complementary to the grooves of the laminations according to 1 educated. The short-circuit ring has positive-locking elements 17 on, leading to the profiled lateral surface of the thrust washer 15 . 16 according to 7a are formed complementary.

After joining the short-circuit ring 13 . 14 on the pressure disc 15 . 16 grab the positive locking elements 17 , in particular the profiled lateral surfaces, into one another, whereby a positive and / or non-positive connection is produced. The torque is from the shorting bars 12 through the short-circuit ring 13 . 14 thus almost lossless in the pressure plate 15 . 16 initiated.

According to 8th is a front view of a shorting ring 13 . 14 and a pressure washer 15 . 16 shown formed integrally and by elastic connecting elements 24 connected to each other. The short-circuit ring 13 . 14 and the pressure disc 15 . 16 have a circular ring shape, wherein an inner diameter of the Kurschlussrings 13 . 14 larger than an outer diameter of the pressure plate 15 . 16 , The Kurschlussring 13 . 14 and the pressure disc 15 . 16 are arranged coaxially with each other. Between the short-circuit ring 13 . 14 and the pressure disc 15 . 16 is an annular gap 25 formed, wherein the short-circuit ring 13 . 14 and the pressure disc 15 . 16 through the elastic connecting elements 24 in the form of bars 26 , as in 4f described above, are connected. The pressure disc 15 . 16 has a central passage opening for receiving a rotor shaft 10 on. The short-circuit ring 13 . 14 has grooves corresponding to the grooves of the laminations according to 1 are formed complementary. The execution of the grooves therefore corresponds to the grooves according to 1 ,

The bridges 26 can be S-shaped. The bridges 26 connect the thrust washer 15 and the shorting ring 13 . 14 relatively movable in the axial direction. In other words, the short-circuit ring 13 . 14 in the longitudinal direction of the rotor shaft 10 opposite the pressure disc 15 . 16 formed movable in the axial direction. The bridges 26 can also be designed to taper radially to the central passage opening. Furthermore, the webs 26 be formed rectilinear and / or curved. The bridges 26 may also have other shapes and / or web gradients.

Generally, the short-circuit ring 13 . 14 in the foregoing description of the embodiments is not limited to a ring shape. The short-circuit ring 13 . 14 can have a triangular, rectangular or polygonal geometry shape. Furthermore, the short-circuit ring 13 . 14 have a circular shape, circular ring shape or another geometric shape. The short-circuit ring 13 . 14 can be formed in one piece, in particular in one piece, or in several parts, in particular several pieces. In other words, the short-circuit ring 13 . 14 be formed as a single part or be formed by a plurality of short-circuit ring sections or more Kurschlußringelemente. The respective short-circuit ring sections can each be integrally formed with a shorting bar. The training of the Kurschlussrings 13 . 14 is not limited to the aforementioned embodiments. The short-circuit ring 13 . 14 may therefore have shapes and configurations which are not explicitly mentioned in the above description. Furthermore, generally the pressure disc 15 with the short-circuit ring 13 from the pressure disk 16 with the short-circuit ring 14 differ from each other. The rotor is therefore not on mirror images of the pressure discs 15 . 16 and the shorting rings 13 . 14 limited.

LIST OF REFERENCE NUMBERS

10

rotor shaft

11

Laminations package

12

Shorting bars

13, 14

Shorting ring

15, 16

thrust washer

17

Form-fitting element

18

gap

19

axial inner bore

20

bag

21

compensation element

22

reinforcement ring

23

undercut

24

elastic connecting element

25

annular gap

26

web

27

material weakening

28

circumferential groove

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 2149970 B1 [0001, 0003]
• DE 102014106614 A1 [0004]

Claims (31)

Rotor for an asynchronous machine comprising - a rotor shaft (10), - in operation magnetically active rotor elements comprising a lamination stack (11), shorting bars (12) and shorting rings (13, 14), - pressure plates (15, 16), between which at least the lamination stack (11) is arranged, wherein the pressure discs (15, 16) are axially connected to at least one of the rotor elements, characterized in that - at least one positive locking element (17) is provided, one of the pressure discs (15, 16) and one of the rotor elements connects, between the laminated plate set (11) and the rotor shaft (10) game or a gap (18) is formed, the pressure plates (15, 16) torque-locking manner with the rotor shaft (10) and the positive-locking element (17) one of the pressure plates (15, 16) and one of the rotor elements for transmitting a torque between the rotor shaft (10) and the rotor elements in the circumferential direction of the rotor shaft (10) connects, wherein the rotation oment is initiated during operation by the rotor elements. Rotor after Claim 1 characterized in that the positive-locking element (17) connects one of the pressure disks (15, 16) and the laminated disk set (11), the pressure disk (15, 16) abutting in the axial direction on the laminated disk set (11). Rotor after Claim 1 or 2 characterized in that the positive-locking element (17) connects one of the pressure disks (15, 16) and one of the short-circuit rings (13, 14), wherein the pressure disk (15, 16) in the axial direction and / or in the radial direction on the short-circuit ring (13, 14) is applied. Rotor according to one of the preceding claims, characterized in that the positive-locking element (17) is arranged on an end face of the pressure disk (15, 16) and extends parallel to the axis of rotation of the rotor shaft (10). Rotor according to one of the preceding claims, characterized in that the positive-locking element (17) by a profiled lateral surface of the thrust washer (15, 16) is formed and extends radially to the axis of rotation of the rotor shaft (10). Rotor according to one of the preceding claims, characterized in that the positive-locking element (17) forms a pin-like projection or a pin-like recess. Rotor according to one of the preceding Claims 1 to 5 characterized in that the positive-locking element (17) forms a wedge-like projection or a wedge-like recess. Rotor according to one of the preceding Claims 1 to 5 characterized in that the positive-locking element (17) forms a polygonal profile. Rotor according to one of the preceding claims, characterized in that the positive-locking element (17) centers the laminated plate set (11) and the rotor shaft (10). Rotor according to one of the preceding claims, characterized in that at least one of the short-circuit rings (13, 14) in the axial direction between the laminated plate set (11) and one of the pressure plates (15, 16) is arranged. Rotor after Claim 10 characterized in that at least one of the pressure discs (15, 16) bears against an axially outer end face of one of the short-circuit rings (13, 14). Rotor after Claim 11 characterized in that the form-locking element (17) designed as a pin-like projection has an axial inner bore (19). Rotor after Claim 11 or 12 characterized in that a chip-receiving pocket (20) is formed next to the positive-locking element (17). Rotor according to one of the preceding claims, characterized in that at least one of the short-circuit rings (13, 14) and the associated thrust washer (15, 16) are movable in the axial direction relative to each other. Rotor according to one of the preceding claims, characterized in that the positive-locking element (17) is adapted for an axial relative movement between at least one of the short-circuit rings (13, 14) and the associated thrust washer (15, 16). Rotor after one of Claims 14 or 15 characterized in that a compensating element (21) between the short-circuit ring (13, 14) and the thrust washer (15, 16) is arranged to compensate for the axial relative movement. Rotor after Claim 16 characterized in that the compensating element (21) comprises a spring element which acts on the short-circuit ring (13, 14) with a spring force acting in the axial direction. Rotor after one of Claims 14 to 17 characterized in that the shorting bars (12) are passed through at least one of the thrust washers (15, 16), the shorting bars (12) and the thrust washer (15, 16) are relatively movable in the axial direction. Rotor according to one of the preceding claims, characterized in that at least one of the pressure discs (15, 16) in the axial direction between the lamination stack (11) and one of the short-circuit rings (13, 14) is arranged. Rotor after Claim 19 characterized in that at least one of the pressure discs (15, 16) has a reinforcing ring (22) which holds the associated short-circuit ring (13, 14) radially outward. Rotor after Claim 19 characterized in that at least one of the pressure discs (15, 16) has an annular undercut (23) which holds the associated short-circuit ring (13, 14) radially inward. Rotor for an asynchronous machine comprising - a rotor shaft (10), - in operation magnetically active rotor elements comprising a lamination stack (11), shorting bars (12) and shorting rings (13, 14), - pressure plates (15, 16), between which at least the lamination stack (11) is arranged, wherein the pressure discs (15, 16) are axially connected to at least one of the rotor elements, characterized in that the pressure discs (15, 16) and the short-circuit rings (13, 14) are integrally formed with each other and torque-locking with the Rotor shaft (10) are connected and for transmitting a torque between the rotor shaft (10) and the lamination stack (11) and / or the short-circuiting rods (12) in the circumferential direction of the rotor shaft (10) connects. Rotor according to one of the preceding claims, characterized in that at least one of the pressure discs (15, 16) has a balancing element. Rotor after Claim 23 characterized in that the thrust washer (15, 16) and the short-circuit ring (13, 14) are connected in a relatively movable manner in the axial direction by at least one elastic connecting element (24). Rotor after Claim 24 characterized in that between the thrust washer (15, 16) and the short-circuit ring (13, 14) an annular gap (25) is formed and elastic connecting elements (24) in the form of webs (26) bridge the annular gap (25) and the pressure plate (15, 16) and the short-circuit ring (13, 14) connect in the axial direction relatively movable. Rotor after Claim 25 characterized in that the webs (26) are S-shaped. Rotor after Claim 23 characterized in that the elastic connecting element (24) has a region with a material weakening (27) between the thrust washer (15, 16) and the short-circuit ring (13, 14), which is elastically deformable in the axial direction. Rotor after Claim 27 characterized in that the area with the material weakening (27) comprises a circumferential groove (28) which extends in the axial direction between the thrust washer (15, 16) and the short-circuit ring (13, 14). Asynchronous machine with a rotor after Claim 1 , Use of at least one thrust washer (15, 16) for a rotor of an asynchronous machine together with at least one form-locking element (17) acting positively in the circumferential direction of the thrust washer (15, 16) for transmitting a torque between a rotor shaft (10) and magnetically active rotor elements of the asynchronous machine Circumferential direction of the rotor shaft (10). Use after Claim 30 characterized in that the rotor comprises a built rotor or a cast rotor.

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