DE102018217737A1 - Rotating electrical machine - Google Patents

Abstract

[TASK] To provide a rotating electrical machine capable of producing a sufficiently high torque even at low speeds.
[Solution] There is disclosed a rotary electric machine (1) comprising a stator (10) and a rotor (20). The rotor (20) comprises a rotor core (21) having a circumferentially arranged series of salient poles (22); a rotor winding (23) permitting the induction of currents in response to a high-frequency harmonic superimposed on the magnetic flux generated by the stator (10); and diodes (D1, D2) for rectifying the induced currents. The circumferentially arranged series of salient poles comprises first salient poles (31), each having a permanent magnet (30), and second salient poles (32) around which the rotor winding (23) is wound.

Description

[Technical area]

The present invention relates to a rotary electric machine.

[Background of the technique]

A rotating electric machine, as in JP 2012-196095 A is disclosed is known. In this known rotary electric machine, salient poles of a rotor are magnetized by passing currents through rotor coils, which currents are induced by an electromotive force generated due to space harmonics superimposed on the magnetic flux generated by a stator, and the like Currents are rectified by diodes.

[State of the art]

[Patent Literature]

Patent Literature 1: JP 2012-196095 A

Summary of the Invention

[Technical task]

However, in the known rotary electric machine, the induced electromotive force generated in each of the rotors during operation in a low speed region is small because the frequency with which the magnetic flux changes is low. Thus, the currents flowing through the rotor coils and rectified by the diodes become small. For this reason, the known rotary electric machine can not generate high torque during operation at low rotor speeds.

An object of the present invention is to provide a rotary electric machine capable of generating a sufficiently high torque even during low rotor speed operation.

[Solution of the task]

As one embodiment of the present invention, there is provided a rotary electric machine, comprising: a rotor rotatably mounted about a rotation axis opposite to a stator, the stator being capable of generating a magnetic flux by voltage-biasing a stator winding; A rotor comprising: first salient poles having permanent magnets; a rotor winding permitting the induction of currents in response to a high frequency harmonic superimposed with the magnetic flux when the high frequency harmonic is co-operating with the rotor winding; and rectifiers for rectifying the induced currents, and second salient poles around which the rotor winding is wound.

[Advantageous Effect of the Invention]

The present invention provides a rotary electric machine capable of generating a sufficiently high torque even at low rotor speeds.

list of figures

• 1 FIG. 12 is a perspective view of a rotary electric machine according to an embodiment of the present invention. FIG.
• 2 is an exploded view of the rotating electrical machine.
• 3 is a fragmentary exploded view of a stator of the rotary electric machine.
• 4 Fig. 10 is an exploded view of the stator of the rotary electric machine showing a stator mounting method.
• 5 Fig. 12 is a fragmentary sectional view taken along a circular line along the circumference of the stator, showing an assembled state of the stator cores and a support in the stator of the rotary electric machine.
• 6 is an exploded view of a second rotor of the rotating electrical machine.
• 7 is a circuit diagram of a rectifier circuit of the rotating electrical machine.
• 8th is a schematic representation of the rotating electrical machine.
• 9 FIG. 12 is a perspective view of a first rotor of the rotary electric machine separated from the second rotor. FIG.
• 10 (a) is an equivalent circuit diagram of the d-axis of the rotating electrical machine.
• 10 (b) is an equivalent circuit diagram of the q-axis of the rotating electrical machine.
• 11 FIG. 12 is a diagram illustrating the first and second rotor sections in a first configuration. FIG.
• 12 is a simulation result representing the magnetic flux density in the case of the first configuration of the first and second rotor sections.
• 13 FIG. 12 is a diagram illustrating the first and second rotor sections in a second configuration. FIG.
• 14 is a simulation result representing the magnetic flux density in the case of the second configuration of the first and second rotor sections.
• 15 FIG. 12 shows a comparison of a static torque in a rotor position comparing a machine according to the first configuration with a machine according to the second configuration. FIG.
• 16 (a) FIG. 12 is a diagram illustrating the fluxes formed when the coils wound around the second salient poles magnetize the second salient poles with a magnetic polarity such that flux relaxation is achieved.
• 16 (b) FIG. 12 is a diagram illustrating the fluxes formed when the coils wound around the second salient poles magnetize the second salient poles with a magnetic polarity such that flux gain is achieved.
• 17 is a simulation result representing the magnetic flux density in a case where the second salient poles are magnetized to achieve flux relaxation.
• 18 is a simulation result representing the magnetic flux density in a case where the second salient poles are magnetized to obtain a flux gain.
• 19 is a simulation result representing the magnetic flux density in a case where the circuit of the rotor winding is in an idle state.
• 20 FIG. 12 shows a comparison of torque / phase characteristics comparing a flow-weakening engine and a flow-augmenting engine. FIG.
• 21 shows a comparison of a torque in a magnetomotive force of the stator, wherein the flow-weakening machine and the flow-enhancing machine are compared.
• 22 shows a comparison of the torque / speed characteristics, comparing the flow-weakening machine and the flow-enhancing machine.
• 23 shows a comparison of the outer conductor voltage at a speed, wherein the flow-attenuating machine and the flow-enhancing machine are compared.
• 24 (a) Figure 12 is a vector diagram illustrating the flux-weakening machine with various vectors in a dq-frame connected to the rotor.
• 24 (b) is a vector diagram representing the flux-enhancing machine with various vectors in the dq frame.
• 24 (c) Figure 4 is a vector diagram illustrating the flux-enhancing machine with various vectors in the dq frame, with the norm of a vector of the input current being reduced.
• 25 FIG. 15 is a perspective view of a change of a rotor showing a first rotor portion separated from a second rotor portion. FIG.
• 26 FIG. 12 is a diagram illustrating the fluxes formed when the coils wound around the second salient poles of the second rotor section magnetize the second salient poles with a magnetic polarity such that flux gain is achieved.

[Detailed description]

In the present case, a rotating electrical machine is disclosed. The machine comprises: a rotor rotatably mounted about a rotational axis opposite a stator, the stator being capable of generating a magnetic flux by stressing a stator winding, the rotor comprising: first salient poles having permanent magnets, a rotor winding which allows the induction of currents in response to a high-frequency harmonic superimposed with the magnetic flux; and rectifiers for rectifying the induced currents, and second salient poles around which the rotor winding is wound. Thus, the rotating electric machine can generate a sufficiently high torque even at low rotor speeds.

[Embodiment (s)]

In the following, exemplary embodiments of the invention will be described with reference to the accompanying drawings, wherein like reference numerals designate like elements.

A rotary electric machine denoted by 1 or having an inner double permanent magnet rotor, a single stator, and axial flux according to the present embodiment is shown in FIG 1 in a perspective view and in 2 shown in an exploded view. The machine 1 includes one stator 10 and one about an axis of rotation relative to the stator 10 rotatably mounted rotor 20 , A three-phase electrical input, ie three-phase alternating currents, supplies the stator 10 with power. In detail, the stator 10 when the coils of a stator winding 11 be energized, generate a magnetic flux. The rotor 20 includes a first rotor section 20A and a second rotor section 20B ,

In the present embodiment, the machine is 1 a machine with axial gap in which the rotor 20 with respect to the axis of rotation axially adjacent to the stator 10 lies, but from the stator 10 axially spaced by an axial gap. As described below, there is no external power supply to the rotor 20 needed.

(Stator)

Referring also to the 3 includes the stator 10 a variety of stator cores 12 which are evenly distributed in the circumferential direction, wherein coils of the stator windings 11 around the stator cores 12 are wrapped, and a bracket 13 to the stator cores 12 such that they are magnetically separated from each other. In this example, the stator cores 12 separate individual pieces. But they can also be integrally formed, provided that they are magnetically separated.

In the present embodiment, the stator cores exist 12 of a magnetic core formed of powder resulting from molding a fine ferromagnetic metallic powder. To ensure excellent electrical insulation, are the stator cores 12 powder-coated with a resin powder. Around the stator cores 12 There are concentrated wound W-phase coils, V-phase coils and U-phase coils.

In the stator 10 are the stator cores 12 magnetically separated from each other because, as previously described, the stator cores 12 are separate individual pieces, wherein the holder 13 , which consists of a non-magnetic material, the stator cores 12 holds. This ensures that the flow of each of the stator cores 12 leaving second space harmonics effectively and successfully with the second salient poles described below, as compared with a conventional stator including a rear yoke which leaves a path for leakage fluxes of the second space harmonic from one stator core to the next adjacent stator core 32 linked, because such leakage flux is prevented by a rear yoke. In addition, the concentrated wound stator winding ensures 11 for that of each side of each of the stator cores 12 exiting flow of the second space harmonic effectively and successfully with the second salient poles 32 concatenated. The production of the stator cores 12 can be simplified by using a rear yoke made of a magnetic material.

Further referring to the 3 each includes stator cores 12 a first and a second (ie, two) stator core section 12A and 12B which is a pitch in accordance with a section through the stator core which is perpendicular to the axis of rotation 12 correspond.

The stator 10 includes the bracket 13 , The holder 13 is annular and made of a non-magnetic material, such as stainless steel. The holder 13 is designed to the stator cores 12 to hold around the coils of the stator winding 11 are wound. The holder 13 is provided with a circumferentially extending or circumferentially extending series of mounting holes 13a formed, which are evenly distributed and each one of the stator cores 12 hold, ie in each case a first circumferentially extending series of first stator core sections 12A and a second axially aligned circumferentially extending series of second stator core sections 12B , An unillustrated motor housing may at its outer periphery with the holder 13 get connected.

As a result, the assembly process of the stator 10 with reference to the 4 described.

The coils of the stator winding 11 are coils with an alpha winding and are for accommodating the stator cores 12 shaped. In alpha windings, a beginning and an end of a wire may extend outward in the same direction.

In an alpha winding of the coils of the stator 11 There is a better area ratio of the cross section of a wire. No other coils can be wound more tightly. The alpha winding of the coils simplifies their external connection because the beginning and the end of each wire from the outer circumference of the stator 10 extend in the same direction.

3 shows a portion of a first circumferentially arranged series of W, V and U phase coils of the stator winding 11 and a second through a gap 11a axially spaced circumferentially arrayed W, V and U phase coils of the stator winding 11 , When assembled, the bracket 13 in this gap 11a disposed between the first and second series of W, V, and U-phase coils.

The holder 13 comprises a circumferentially arranged series of mounting holes 13a each extending radially and inwardly, in a radial direction, from a radially outer wide edge to a radially inner narrow edge. The W, V and U phase coils of the first upper circumferentially extending row and the W, V and U phase coils of the second circumferentially arranged row are on the upper and lower sides of the holder 13 arranged so that each of the openings surrounded by the phase coils of the first row arranged in the circumferential direction with one of the mounting holes 13a and is also axially aligned with an opening bounded or surrounded by the phase coils of the second axially spaced circumferentially array.

In the foregoing description and in the following description, the term "radial direction" refers to a direction perpendicular to the axis of rotation of the rotor 20 runs. The term "radially outward" and the term "radially inward" respectively designate remote and less distant positions from the axis of rotation in a radial direction perpendicular to the axis of rotation.

Because the phase coils of the stator winding 11 on both sides of the bracket 13 are arranged, the first stator core sections 12A through the openings bounded by the phase coils in the mounting holes 13a axially inserted and the second stator core sections 12B become through the openings defined by the phase coils in the mounting holes 13a Introduced until they are inside the mounting holes 13a meet, causing the phase coils of the stator winding 11 against the holder 13 be pressed (see 5 ).

A potting of the assembled arrangement of the phase coils of the stator winding 11 with the first and second stator core sections 12A and 12B and the holder 13 is preferred. In the potting process, the assembly is placed in a mold, which is then filled with an insulating liquid resin, thereby protecting the assembly. The mold is part of the finished stator 10 and can limit electromagnetic vibrations and improve the thermal conductivity for cooling.

As previously described, the stator cores are 12 in the present embodiment, powder-coated for isolation with a resin powder. The coils of the stator winding 11 But you can also use insulators around the stator cores 12 wherein the insulators are formed by molding from a non-magnetic material such as an insulating resin, for excellent insulation of the stator cores 12 to offer.

5 FIG. 12 is a schematic sectional view of the stator assembled as just described. FIG 10 ,

As in 5 is shown, each of the first and second stator core sections 12A and 12B with an edge or a prominent edge 12a formed to the corresponding coil of the stator winding 11 to hold in position. This will prevent the coils of the stator winding 11 from the first and second stator core sections 12A and 12B slip out.

The stator described above 10 is capable of generating a rotating magnetic field by the coils of the stator winding 11 be supplied with a three-phase alternating current. The magnetic flux of the stator 10 linked to the rotor 20 what the generation of a rotor 20 applied torque caused.

(Rotor)

Referring again to the 1 and 2 includes the rotor 20 a first rotor section 20A and a second rotor section 20B ,

The first rotor section 20A is axially adjacent to one side of the stator 10 on and the second rotor section 20B is axially adjacent to the opposite side of the stator 10 so that they can rotate about the axis of rotation.

In the present embodiment, the first rotor section is 20A from one side of the stator 10 axially spaced by an axial air gap, while the second rotor section 20B from the opposite side of the stator 10 axially spaced by an axial air gap, so that the stator 10 lies between them. The first and second rotor sections 20A and 20B have the same structure and arrangement. Accordingly, only the second rotor section will follow in the sequence 20B described, and the description of the first rotor section 20A omit for the sake of brevity.

Referring to the 2 and the 6 includes the second rotor section 20B an annular rotor core 21 , a rotor winding 23 and rectifier circuits 24 (please refer 7 ).

The rotor core 21 includes a circumferentially extending or arranged series of salient poles 22 , The rotor core 21 is a core of a magnetic powder consisting of compressed ferromagnetic fine powders.

The circumferentially extending series of salient poles 22 is a series of alternating first salient poles 31 and second salient poles 32 , Every first salient pole 31 has a permanent magnet 30 on. For every second leg pole 32 is a rotor winding 23 wound. As in 2 The best visible are the first and second salient poles 31 and 32 arranged alternately.

Each of the first salient poles 31 has a pair of excellent ribs 31a on. Ribs 31a each pair protrude in the same direction as each of the second salient poles 32 out. A permanent magnet 30 is between the ribs 31a embedded each pair and is based on an adhesive with one of the first salient poles 31 bonded. Examples of such an adhesive are silicon-based adhesives, acrylic adhesives, and epoxy adhesives. The adhesive is one of the above-mentioned adhesives, but is not limited to these.

Ribs 31a each pair serve to limit the circumferential movement of the permanent magnet 30 , In addition, they serve to hold the permanent magnet 30 in the correct position until the permanent magnet 30 with one of the first salient poles 31 is glued. Thus, bonding does not become an exclusive device for positioning each of the permanent magnets 30 at one of the first salient poles 31 needed. This improves the working efficiency during the bonding operation, thereby reducing manufacturing costs.

The second salient poles 32 protrude from the stator 10 opposite surface 21a of the stator core 21 axially in the direction of the stator 10 out. Between the two circumferentially adjacent salient poles, namely between each of the second salient poles 32 and the first salient pole adjacent thereto 31 , there is a rotor slot 34 , The coils of the rotor winding 23 are in the rotor slots 24 around the second salient poles 32 wound.

The rotor winding 23 allows induction of alternating currents as a function of the magnetic flux of the stator 10 superimposed high-frequency harmonics. In detail, the rotor winding comprises 23 inductors 23a and field coils 23b ,

The induction coils 23a are from the stator 10 axially separated but at the stator 10 arranged adjacent. In each of the induction coils 23a is due to the interaction with one with the magnetic flux of the stator 10 superimposed high-frequency harmonics, ie a room harmonic, generates a current. The induction coils 23a are about rectifiers described below with the field coils 23b connected.

It is known that on the stator 10 generated rotating magnetic field in addition to the fundamental vibration contains a space harmonic. The space harmonic is not synchronized with the fundamental.

The field coils 23b are arranged to magnetize the second salient poles 32 To conduct field currents resulting from the rectification of the induced currents through the rectifier circuits 24 (in 7 shown).

Each of the rectifier circuits 24 is a circuit for rectification by the rotor windings 23 directed induced alternating currents. In particular, these circuits are designed to be in the induction coils 23a rectified induced AC currents to a DC current to the field coils 23b to be supplied (see 7 ).

Further referring to the 7 includes the rectifier circuit 24 two diodes D1 and D2 as a rectifier. Referring also to the 8th is each of the rectifier circuits 24 a closed circle, the diodes D1 and D2 , an induction coil 23a and a field coil 23b around a second salient pole 32 at the first rotor section 20A are wound, and an induction coil 23a and a field coil 23b around a second salient pole 32 on the second rotor section 20B are wound, connecting with each other.

Since the second rotor section 20B around a pole pitch (see 8th ) in the circumferential direction of the first rotor section 20A is offset, each of the rectifier circuits connects 24 a set of induction and field coils 23a and 23b around a second salient pole 32 at the first rotor section 20A with induction and field coils 23a and 23b around an adjacent salient pole 32 on the second rotor section 20B , Thus, the number of passes through the machine 1 required rectifier circuits a function of the number of poles.

The diodes D1 and D2 are housed in a diode housing, not shown, and on the rotor 20 assembled. The diodes D1 and D2 can be inside the rotor 20 be mounted. The rectifiers are diodes but are not limited thereto and may be semiconductor devices such as switching devices.

The rectifier circuit 24 is a full-wave rectifier of the type of mid-point switching, which, following an alternating direction of one of the two induced input ACs to produce a 180 ° phase difference, positive half-waves of two induced input alternating currents (AC) using two diodes D1 and D2 into a pulsating DC output current (DC).

On the basis of the diodes D1 and D2 converts the rectifier circuit 24 the induced input alternating currents, which in two induction coils 23a be induced in an output DC. The output DC becomes the field coils 23b fed as a field current, causing the field coils 23b the associated second salient poles 32 magnetize.

In the present embodiment, the field coils 23b wrapped so that each of the second salient poles 32 on each of the first and second rotor sections 20A and 20B on an inner, the stator 10 a magnetic pole S and on an outer surface a magnetic pole N (see 9 ) so that the poles are aligned in the axial direction.

As described above, depending on a with the stator 10 generated magnetic flux superimposed spatial harmonics a current in each of the induction coils 23a induced. The space harmonic becomes dependent on a change in magnetic reluctance in an air gap between the stator 10 and each of the first rotor sections 20A and second rotor sections 20B for rotation of the first and second rotor sections 20A and 20B generating the circumferentially arranged rows of alternating first and second salient poles 31 and 32 respectively.

The room harmonic becomes in a state of rest with the stator 10 connected coordinate system referred to as second spatial harmonics; but is called in a synchronized with the rotating magnetic field rotating coordinate system as a third spatial harmonics.

In the present embodiment, the number of slots in the stator 10 "18", and the number of poles in each of the first and second rotor sections 20A and 20B of the rotor 20 is "12", so the ratio between the poles and slots is "3: 2". Since a harmonic that is three times the fundamental frequency pulsates the permeance distribution at each of the first and second salient poles 31 and 32 caused the magnetic coupling coefficient due to the third spatial harmonic reaches a peak, thereby increasing the likelihood that the third spatial harmonics with the second salient poles 32 chained, increased.

The inductance in a positive direction along the d-axis and the inductance in a negative direction along the d-axis differ in their order of magnitude, so that, in the case where the relationship between the poles and the slots at 3: 2 is not symmetrical. Thus, the second spatial harmonics appear in the stationary coordinate system or the third spatial harmonics in the rotating coordinate system.

The third space harmonic links with and induces in each of the induction coils 22 an induced alternating current because it is not symmetrical with the fundamental frequency.

(Surface structure of the rotor core)

Referring again to the 1 and 2 consists of the rotor core 21 on his the stator 10 opposite inner surface of the circumferentially extending series of first salient poles 31 and second salient poles 32 has, on its opposite outer surface 21b from a variety of elevated segments 40 , The variety of elevated segments 40 are arranged in the circumferential direction and evenly distributed.

Each of the elevated segments 40 has a flat outer surface 40a on that with a positioning hole 40b is formed, which is used to an unillustrated diode housing on the outer surface 40a to assemble. In the diode housing are the aforementioned diodes D1 and D2 a rectifier circuit 24 accommodated. Each of the diode cases is annular and has a plurality of protrusions on its surface that fit into one of the positioning holes 40b match it to the rotor core 21 to position. The outer surface 40a is rejuvenated on its edge.

In the present embodiment, the plurality of elevated segments provides 40 an uneven surface structure on a surface 21b of the rotor core 21 , reducing the area of the rotor core 21 is increased. This increases the rigidity of the flattened rotor core 21 , which restricts surface vibrations caused by its natural vibration.

When a rotor core is not formed with raised segments, it is difficult to limit the surface vibrations caused by its natural vibration to rotate a rotor because the rigidity of the rotor core is low.

(Structure of the following pole)

Referring to the 9 and further referring to FIGS 2 , follower pole structures include a structure in which, in the present embodiment, each of the first and second rotor sections 20A and 20B the rotating electric machine 1 a rotor core 21 with a circumferentially or circumferentially extending series of alternating ones first leg poles 31 and second salient poles 32 which are alternately arranged and evenly distributed, wherein: each of the first salient poles 31 in the form of a permanent magnet 30 supporting permanent magnet pole is present; and each of the second salient poles in the form of an induction coil 23a and a field coil 23b comprehensive pole piece is present. The second leg pole 32 does not carry a permanent magnet.

There are follower pole rotors in which salient poles with permanent magnets and magnetic salient poles without permanent magnets, often called "follower poles", are alternately arranged circumferentially along a circle about the central axis of a rotating electrical machine. When such a follower pole rotor is used in a rotary electric machine, the magnetic fields generated by the salient poles with permanent magnets cooperate with the adjacent follower poles to magnetize them so that each of the follower poles generates a magnetic polarity similar to that of the adjacent ones Salient pole with the permanent magnet generated opposite polarity.

Following pole rotors are advantageous in that the use of permanent magnets is reduced by half compared to other type rotors having only salient poles with permanent magnets, but have a problem to be solved as follows. Specifically, in follow-on pole rotors, the magnetic reluctance (or resistance) in a magnetic circuit passing through a tracking pole is not less than the magnetic reluctance in a magnetic circuit passing through a salient pole with a permanent magnet, so that the density of the magnetic flux guided through a gap River, ie an air gap flux density, between the follower pole and a stator becomes less than the flux density through a gap between the salient pole with a permanent magnet and the stator. This results in a considerable torque ripple (of a considerable order of magnitude).

In the present embodiment, the magnetic reluctance in each of the second salient poles 32 , due to an induction coil 23a and a field coil 23b in each of the first and second rotor sections 20A and 20B around the second leg pole 32 are wound, vary.

The magnetic reluctance in each of the second salient poles 32 varies depending on the amplitude of an induced electromotive force (or induced EMF) in the associated induction coil 23a around the second leg pole 32 is wound. The induced EMF in the associated induction coil 23a varies depending on the second space harmonic one through the second salient poles 32 guided magnetic field. The magnetic flux of the second spatial harmonic varies as a function of the stator current, the current phase and the rotational speed of the rotor 20 ,

Thus, the magnetic reluctance varies in each of the second salient poles 32 depending on the stator current, the current phase and the speed of the rotor 20 , As by a in 10 (b) As shown in the equivalent q-axis equivalent circuit, the magnetic reluctance varies depending on the stator current, the current phase and the rotational speed of the rotor 20 so that the second salient poles 32 in the present embodiment can serve as variable field poles. The 10 (a) shows an equivalent circuit diagram of the d-axis. In the 10 (a) and 10 (b) are vd: a d-axis component of the armature voltage; vq: a q-axis component of the armature voltage; id: a d-axis component of the armature current; iq: a q-axis component of the armature current; Ra: a winding resistance; Rc: an iron loss resistance; ω: an angular velocity; Ld: a d-axis inductance; Lq: a q-axis inductance; and Ψm: a magnetic flux generated by permanent magnets.

In the present embodiment described below, each of the second salient poles is 32 a salmon pole reinforcing the river. This allows a reduction in the magnetic reluctance in each of the second salient poles 32 by the induced EMF, which depends on the stator current, the current phase and the speed of the rotor 23a varies in the associated induction coil 23a is increased. As a result, the torque ripple resulting from a difference between an air-gap flux density between each of the first salient poles becomes 31 and the stator 10 and an air gap flux density between each of the second salient poles 32 and the stator 10 results in limited, because a reduction of the magnetic resistance, the air gap flux density between the second salient poles 32 and the stator 10 elevated.

(Configuration of the first and second rotor sections) The rotor 20 which is in the form of a double rotor comprises, in the present embodiment, a first rotor portion 20A and a second rotor section 20 , The first and second rotor sections 20A and 20B are rotatable about an axis of rotation and on the stator 10 mounted axially adjacent to opposite sides of the stator. There are two relative configurations of the first and second rotor sections described below 20A and 20B :

In the in 11 schematically shown first configuration are the first salient poles 31 the first extending in the circumferential direction or arranged series of alternating first salient poles 31 and second salient poles 32 of the first rotor section 20A and the first salient poles 31 the second circumferentially extending or arranged series of alternating first salient poles 31 and second salient poles 32 of the second rotor section 20B axially aligned. In the in 11 shown first configuration are the permanent magnets 30 of the first rotor section 20A arranged so that it is one of the polarity of the permanent magnets 30 of the second rotor section 20B have opposite polarity.

In the in 13 schematically shown second configuration, is the second rotor section 20B from the first rotor section 20A offset by one pole pitch in the circumferential direction. In other words, the first salient poles 31 the first circumferentially arranged series of alternating first salient poles 31 and second salient poles 32 of the first rotor section 20A and the second salient poles 32 the second circumferentially arranged series of alternating first salient poles 31 and second salient poles 32 of the second rotor section 20B axially aligned. In the in 13 shown second configuration are the permanent magnets 30 of the first rotor section 20A arranged so as to be one side of the stator 10 facing polarity, and the permanent magnets 30 of the second rotor section 20B are arranged so that they are one of the opposite side of the stator 10 facing opposite polarity.

Referring also to the 12 and 14 Subsequently, the flow weakening process of the first configuration is compared with that of the second configuration.

The 12 is a simulation result showing the magnetic flux density in a rotary electric machine having first and second rotor sections 20A and 20B in the first configuration according to the 11 represents whose rotor winding 23 around second salient poles 32 on each of the first and second rotor sections 20A and 20B are wound in a manner suitable for the flow attenuation process to reduce the air gap flux density. As in 12 well visible, one is through the arrows during the flux weakening process F _pm Designated flow direction of the flow from the permanent magnet 30 and one by the arrows F _em designated flow direction of the flow of the pole pieces of the second salient poles 32 opposite directions.

The 14 is a simulation result showing the magnetic flux density in a rotary electric machine having first and second rotor sections 20A and 20B in the second configuration according to the 13 represents whose rotor winding 23 around second salient poles 32 on each of the first and second rotor sections 20A and 20B are wound in a manner suitable for the flow attenuation process to reduce the air gap flux density. As in 13 well visible, one is through the arrows during the flux weakening process F _pm Designated flow direction of the flow from the permanent magnet 30 and one by the arrows F _em designated flow direction of the flow of the pole pieces of the second salient poles 32 opposite directions.

As in 12 clearly visible, shows the machine with the first and second rotor sections 20A and 20B in the in 11 shown first configuration that the air gap flux density of a rotor position of the rotor 20 in which one of the first salient poles 31 at the first rotor section 20A and the corresponding first salient pole 31 on the second rotor section 20B axially aligned with each other, to the next position in which one of the second salient poles 32 at the first rotor section 20A and the corresponding second salient pole 32 on the second rotor section 20B axially aligned with each other, is very different. In addition, at each rotor position where one of the first salient poles is 31 and its corresponding salient pole or one of the second salient poles 32 and its corresponding salient pole are axially aligned with each other, the air gap flux density between the stator 10 and the first rotor section 20A approximately equal to the air gap flux density between the stator 10 and the second rotor section 20B ,

Referring to the 15 In the following, a static torque with rotor position characteristics will be described. The 15 shows that in the case of the machine with the first and second rotor sections 20A and 20B according to the first configuration (see 11 ), the static torque waveform of a torque for rotating the first rotor section 20A with a torque for rotation of the second rotor section 20B is in phase so that the torque peaks occur simultaneously. Thus, the magnitude of the peaks of the static torque waveform of a total torque becomes the rotation of the first and second rotor sections 20A and 20B increases, but the torque ripple is increased to a not insignificantly high level.

The machine with the first and second rotor sections 20A and 20B according to the second configuration (see 13 ) differs from the aforementioned machine in which the first and second rotor sections 20A and 20B in the first configuration (see 11 ), in that in each rotor position in which one of the alternating first salient poles 31 and second salient poles 32 at the first rotor section 20A and the corresponding first salient pole 31 and second salient pole 32 on the second rotor section 20B axially aligned with each other, the air gap flux density between the stator 10 and the first rotor section 20A from the air gap flux density between the stator 10 and the second rotor section 20B differs because the second rotor section 20B from the first rotor section 20A offset by one pole pitch in the circumferential direction. Specifically, in a rotor position in the example of one of the first salient poles 31 at the first rotor section 20A and the corresponding second salient pole 32 on the second rotor section 20B axially aligned with each other, or one of the second salient poles 32 at the first rotor section 20A and the corresponding first salient pole 31 on the second rotor section 20B axially aligned, the air gap flux density between the stator 10 and the first rotor section 20A or the air gap flux density between the stator 10 and the second rotor section 20B high, while the other is low. Referring to the 14 is in a rotor position, in which, for example, one of the second salient poles 32 at the first rotor section 20A and the corresponding first salient pole 31 on the second rotor section 20B axially aligned, the air gap flux density between the stator 10 and the first rotor section 20A high, while the air gap flux density between the stator 10 and the second rotor section 20B is low.

Thus, in the case of the engine having the first and second rotor sections 20A and 20B in the second configuration (see 13 ) The static torque waveform of a torque for rotation of the first rotor section 20A by 120 degrees relative to a torque for rotation of the second rotor section 20B out of phase, so the torque peaks, as in 15 shown to take place at different times. Thus, the magnitude of the peaks of the static torque waveform of total torque becomes the rotation of the first and second rotor sections 20A and 20B reduced and the torque ripple is reduced to a lower level than the not insignificant high level, on the torque ripple of the machine with the first and second rotor sections 20A and 20B in the first configuration (see 11 ) is increased.

As just described, the machine can with the first and second rotor sections 20A and 20B in the second configuration (see 13 ) contribute to the reduction of torque ripple. In the present embodiment, the in 13 used second configuration shown.

(Field setting)

Referring to the 16 to 24 , provides the 16 (a) the air gap flux at a positive excitation coil current, the second salient poles 32 in the second position (see 13 ) flows around while the 16 (b) the air gap flux at a second salient poles 32 represents around negative negative excitation coil current. The field settings just described are for machines in the first position (see 11 ) arranged second salient poles applicable.

As in 16 (a) shown, the average air gap flux is reduced when a positive current to the second salient 32 surrounding excitation winding is applied, because the flow directions over the permanent magnet 30 and the second salient poles 32 are opposite, whereby a field weakening is achieved. As in 16 (b) is shown, the flux generated by the excitation winding is added to the flow of the permanent magnets when a negative current to the second salient pole 32 surrounding field winding is applied, whereby a field gain is achieved. In the 16 (a) and 16 (b) are those through the first salient poles 31 at the first rotor section 20A worn permanent magnets 30 arranged so that it has one of the polarity of the first salient poles 32 on the second rotor section 20B worn permanent magnets 30 have opposite polarity, with their north poles the stator 10 are opposite. Alternatively, the permanent magnets 30 with her the stator 10 opposite south poles be arranged so that they are one of the polarity of the first salient poles 32 on the second rotor section 20B worn permanent magnets 30 have opposite polarity. In this case, the average air gap flux is reduced when a negative current is applied to the second salient pole 32 surrounding excitation winding is applied, because the flow directions over the permanent magnet 30 and the second salient poles 32 are opposite, whereby a field weakening is achieved. When the direction of the field current is changed to become positive, the flow direction becomes over the second salient poles 32 added to the flux generated by the permanent magnets, whereby the magnetic field is amplified and the stator 10 Chaining flow is increased.

To achieve flux relaxation, the coils are the rotor winding 23 around the second salient poles 32 wrapped so that when a direction of one through the rotor coils 23 conducted current the same as the winding direction of the coils of the rotor winding 23 is, the second salient poles 32 generate a field flux with a direction tending to pass through the permanent magnets 30 to reduce generated magnetic flux. In 16 (a) are the coils of the rotor winding 23 around the second salient poles 32 at each of the first and second rotor segments 20A and 20B such that when a direction of one through each coil of the rotor winding 23 conducted current the same as the winding direction of the coils of the rotor winding 23 is, the second salient poles 32 the one by the arrows F _em in 16 (a) generate designated river, which has a direction that by the arrows F _pm in 16 (a) Designated flow direction of the permanent magnet 30 is opposite.

Thus, when a flux relaxation is achieved, the direction of the through the permanent magnets 30 generated river F _pm and the direction of the river F _em at the second leg poles 32 opposite directions. In this case, the flux density at the second salient pole becomes 32 , as in 17 Visible, reduced, as the magnetic reluctance at each of the second salient poles 32 is increased, so that an introduction of the salient poles 32 Chaining flow of the stator 10 in the circumferentially adjacent first salient pole 31 difficult. As a result, the maximum value of the rotor 20 generated torque waveform, as in 20 shown, reduced.

On the other hand, to achieve flux amplification, the coils are the rotor winding 23 so around the second salient poles 32 that wound when the direction of one through the coils of the rotor winding 23 conducted current the same as the winding direction of the coils of the rotor winding 23 is, the second salient poles 32 generate a field flux with a direction tending to pass through the permanent magnets 30 amplify generated magnetic flux. In 16 (b) are the coils of the rotor winding 23 around the second salient poles 32 at each of the first and second rotor segments 20A and 20B such that when a direction of one through each coil of the rotor winding 23 conducted current the same as the winding direction of the coils of the rotor winding 23 is, the second salient poles 32 the one by the arrows F _em in 16 (b) generate the designated flow, which is the same direction as that through the arrows F _pm in Fig. (16b) designated flow direction of the permanent magnet 30 having.

Thus, when a flux relaxation is achieved, the direction of the through the permanent magnets 30 generated river F _pm and the direction of the river F _em at the second leg poles 32 the same direction. In this case, the flux density at the second salient pole becomes 32 , as in 18 Visible increases, since the magnetic reluctance at each of the second salient poles 32 is reduced, so that an introduction of the salient poles 32 Chaining flow of the stator 10 in the circumferentially adjacent first salient pole 31 easy. As a result, the maximum value of the torque becomes the rotation of the rotor 20 , as in 20 shown, increased.

The 19 is a simulation result representing the magnetic flux density in a reference example in which the rotor winding 23 (including the rotor coils) is in an idle state. In this case, the flux density is at the second salient poles 32 higher than in the case of a flux weakening (see 19 compared to 17 ), but lower than in the case of flux amplification (see 19 compared to 18 ). Thus, the in 20 shown torque waveforms that the maximum value of the torque for rotation of the rotor 20 in the reference example (see 19 ) greater than in the case of flux weakening (see 16 (a) and 17 ), but smaller than in the case of flux amplification (see 16 (b) and 18 ).

Referring to 21 In the graphs of torque, the d-axis current is zero (id = 0). The magnitude of the magnetomotive force (MMK) is equal to the product of the current in the coils and the number of turns of the coil.

As in 21 As shown, each of the flow-attenuating type and flux-enhancing type machines has characteristics according to which the higher the magnetomotive force, the higher the torque for rotating the rotor becomes. The flux-enhancing type machine is superior to the flow-attenuating type machine because the magnitude of the torque is larger for each magnetomotive force and the increase of the torque is larger.

22 is a graphical representation of the torque as a function of the rotor speed at a maximum torque per ampere (MTPA). The MTPA is achieved, for example, by varying the magnetic field vector with the input AC currents to take advantage of the reluctance torque.

As in 22 As shown, the flow-attenuating type engine has a torque / speed characteristic in which the torque decreases along with the rotational speed up to a predetermined rotational speed which is in the in 22 shown example, 1000 rpm. At speeds that exceed this predetermined speed, the torque does not decrease further with the speed, because the self-excitation generates sufficient electrical energy.

On the other hand, the flux-enhancing type engine has a torque / speed characteristic in which the torque increases along with the rotational speed up to a predetermined rotational speed, which in the in 22 example shown 2000 U / min. is. At speeds that exceed this predetermined speed, the torque does not increase with the speed because the self-excitation generates sufficient electrical energy.

The 23 FIG. 12 is a graph of outer conductor voltage versus rotor speed under MTPA conditions, comparing the flux-attenuating type machine and the flux-enhancing type machine. FIG.

The 23 shows that both the flow-attenuating type engine and the flow-enhancing type engine have similar torque / speed characteristics in which the torque increases along with the rotor speed. The flux-enhancing type machine is superior to the flow-attenuating type machine because the magnitude of the torque is greater for each speed and the torque increase rate.

Referring to the 24 (a) . 24 (b) and 24 (c) For example, the flow-weakening type machine, the flow-enhancing type machine, and the machine are compared with a rotor winding in the idle state. In each of the 24 (a) . 24 (b) and 24 (c) the machine whose rotor winding is in the idling state (ie Ψ _e-coil = 0), represented by vectors drawn as dotted lines, where: I _a , the current vector; Ψ _m the rotor flux through the permanent magnets; Ψ _e-coil the rotor flux due to the electromotive force generated in the rotor coils; j , the inertia of the rotor; ω the angular velocity of the dq frame connected to the rotor; i _d , the d-axis current; i _q , the q-axis current; L _d , the d-axis inductance; L _q , the q-axis inductance; R , the reluctance; and V _s which are outer conductor voltage.

As from the in 24 (a) As shown by a solid line shown vectors, the magnetic reluctance in the machine of the flux-relaxing type at the second salient poles 32 increased because the directions of the rotor flux Ψ _e-coil and the rotor flux Ψ _m are opposite directions.

This reduces the outer conductor voltage V _s in the flow-attenuating-type machine, as compared with the vector of the outer-conductor voltage shown by a solid line V _s with the vector of the outer conductor voltage shown in dotted line in FIG 24 (a) is recognizable.

On the other hand, as from the in 24 (b) shown by a solid line vectors shown, the magnetic reluctance in the machine of the flux-enhancing type at the second salient poles 32 increased because the directions of the rotor flux Ψ _e-coil and the rotor flux Ψ _m same direction.

This increases the outer conductor voltage V _s in the flux-enhancing type machine, as compared with the vector of the outer-conductor voltage shown by a solid line V _s with the vector of the outer conductor voltage shown in dotted line in FIG 24 (b) is recognizable.

In a case where the flux-enhancing type machine reduces the outer conductor voltage V _s requires, the gain amount of the flux can be reduced by the vector norm (or magnitude) of the current vector I _a as by the in 24 (c) indicated by the dotted line vector, is reduced because the rotor flux Ψ _e-coil varies as a function of a change in the magnetic field linked to the rotor.

In a case where a flux-enhancing type machine has a d-axis inductance L _d which is larger than a q-axis inductance L _q is ( L _d > L _q ), is a q-axis voltage V _q greater than a d-axis voltage V _d so that a dq-frame voltage limiting ellipse is formed, at which the d-axis voltage V _q represents a radius of its long axis. Thus, it is necessary for the flux-enhancing machine to operate with a reduced vector standard of a current vector.

For the foregoing reasons, it is better to select a flow enhancing machine rather than a flux weakening machine and to vary the vector norm of the current vector to set an operating point of an outer conductor voltage, thereby improving torque and reducing copper loss for good performance.

Thus, in the present embodiment, the winding direction of the coils of the rotor winding 23 around the second salient poles 32 preferably determined such that the direction of an input DC dependent direction of the through the coils of the rotor winding 23 directed river and the direction of the flow of permanent magnets 30 , as in 16 (b) shown are the same direction to provide a flux-enhancing machine with internal permanent magnets.

As described above, the rotary electric machine 1 according to the present Embodiment, in addition to the reluctance torque, of the permanent magnets 30 gain a magnetic torque because the first salient poles 31 each of the first and second rotor sections 20A and 20B permanent magnets 30 carry. Thus, the present embodiment of the rotary electric machine 1 even at low rotor speeds 20 to generate a sufficiently high torque.

In the present embodiment, DC currents resulting from the rectification are through the diodes D1 and D2 of the rectifier 24 , resulting from induced alternating currents in the around the second salient poles 32 without permanent magnets 30 at each of the first and second rotor sections 30A and 20B wound coils of the rotor winding 23 be induced by the coils of the rotor winding 23 around the second salient poles 32 left, leaving it the second salient poles 32 magnetize so that the second salient poles 32 as a result serve as magnetic poles with variable flux.

In addition, the variation of the flow of the space harmonics by the adjustment of the flow of the stator by the adjustment of three-phase currents causes a variation of the power range of the rotary electric machine 1 because the second salient poles 32 work as magnetic poles with variable flux. For example, the power range extends toward a higher speed by attenuating the flow of the stator to reduce the flow of the room harmonics at high speeds.

In the present embodiment, a circumferentially arranged series of alternating first and second salient poles comprises 22 at each of the rotor sections 20A and 20B alternately first salient poles 31 (with permanent magnets 30 ) and second salient poles 32 (without permanent magnets), so that the coils of the rotor winding 23 in each of the second salient poles 32 surrounding and up to the two adjacent first salient poles 31 extending space around the second salient poles 32 can be wound. This allows an increase in the number of turns around each of the second salient poles 32 coiled coils, which makes contact with each of the second salient poles 32 linking flux is amplified.

Furthermore, the second salient poles 32 in the present embodiment are not provided with permanent magnets, whereby the projection ratio (L _q / L _d ) is increased to achieve an improved reluctance torque as compared to the prior art circumferentially array of permanent magnet poles. In addition, a reduction in the number of permanent magnets and the manufacturing cost is expected.

In the present embodiment, demagnetization of the permanent magnets becomes 30 restricted by the use of coils on the second salient poles 32 is restricted and the first salient poles 31 Do not be surrounded by coils to control the amount of radiant heat of the coils that make up the permanent magnets 30 are exposed to reduce.

In the present embodiment, a mutual magnetic interference between two of the circumferentially distributed permanent magnets 30 reduced, because each of the first and second rotor sections 20A and 20B a circumferentially arranged series of alternating first salient poles 31 and second salient poles 32 includes.

In the present embodiment, the torque density is increased because the range in which the torque is generated is increased because of the rotor 20 a so-called double rotor is that on one side of the stator 10 axially adjacent first rotor section 20A and the one on the opposite side of the stator 10 axially adjacent second rotor section 20B includes. This improves the power output.

In the present embodiment, the first and second rotor sections are 20A and 20B arranged such that each of the first salient poles 31 at the first or second of the rotor sections 20A and 20B with one of the second salient poles 32 at the other of the first or second rotor sections 20A and 20B flees. Since the first rotor section 20A by an electrical angle of 180 ° from the second rotor section 20B offset in the circumferential direction, rotate the first and the second rotor sections 20A and 20B , Thus, the torque ripple of the first rotor section act 20A and the torque ripple of the second rotor section 20B in such a way that they balance each other (see 15 ), whereby the torque ripple of the entire torque is reduced.

In the present embodiment, the coils comprise the rotor winding 23 the induction coils 23a and the field coils 23b , The induction coils 23a and the field coils 23b are separated to the operation of the induction coils 23a for current induction from the operation of the field coils 23b to separate the generation of the magnetic field. This prevents a reduction in the efficiency of the process of inducing current and the process of generating the magnetic field due to mutual magnetic interference between the process of inducing current and the process of generating the magnetic field.

There, in the present embodiment, the stator cores 12 through the holder 13 are made of a non-magnetic material, each of the stator cores 12 from the neighboring stator core 12 magnetically isolated. This prevents scattering on one of the stator cores 12 generated room harmonics in one or more of the other stator cores 12 , whereby the concatenation of the Raumharmonischen with the induction coils 23a during the rotation of the rotor 20 is relieved. Thus, the space harmonic is used more effectively.

In the present embodiment, an induction coil 23a and a field coil 23b different coils. But they can also be a common coil. In this case, the common coil and a diode may be used to form a closed loop.

In addition, the first and second rotor sections 20A and 20B formed in the present embodiment according to the second configuration (see 13 ). But you can also according to the first configuration (see 11 ) be formed.

In the present embodiment, each of the first and second rotor sections includes 20A and 20B a circumferentially arranged series of alternating first salient poles 31 (with permanent magnets 30 ) and second salient poles 32 (with rotor windings 23 ), wherein the first rotor section 20A and the second rotor section 20B but also like in the 25 and 26 shown can be formed.

As in the 25 and 26 shown, the first rotor section 20A In detail, a circumferentially arranged series of salient poles, each as a first salient poles 31 with a permanent magnet 30 are formed, and the second rotor section 20B a circumferentially arranged series of salient poles, each as a second salient poles 32 with one or more rotor coils of a rotor winding 23 are formed.

With respect to the second rotor section 20B according to the changes in the 25 and 26 , the coils are the rotor winding 23 around second salient poles 32 wound so that DC currents can flow clockwise or counterclockwise around the second salient poles 32 to magnetize such that adjacent second salient poles 32 change their magnetic polarity one after the other. The second salient poles 32 are spaced apart and arranged in a ring with two axial end surfaces. Each of the salient poles 32 has a magnetic polarity at one axial end surface, and an opposite magnetic polarity at the other axial end surface, so that alignment of the poles in the axial direction is formed. Through the first salient poles 31 worn permanent magnets 30 Change their magnetic polarity one after the other. The permanent magnets 30 are spaced apart and arranged in a ring with two axial end surfaces. Every permanent magnet 30 has a magnetic polarity at one axial end surface, and an opposite magnetic polarity at the other axial end surface, so that alignment of the poles in the axial direction is formed.

According to the change in the 25 and 26 can the second rotor section 20B a higher torque than the first rotor section 20A produce. Thus, this change can be applied to other loads.

The rotating electric machine 1 Not only can be used in engines for vehicles, but also in generators for the production of wind power energy and in motors for machine tools.

In the present embodiment, a rotary electric machine 1 as a machine with an axial gap. But it can also be performed as a rotating electric machine with a radial gap. In the present embodiment, a rotary electric machine 1 designed as a three-phase motor. But it can also be designed as a four-phase or five-phase or two-phase motor.

In the present embodiment, a stator 10 Use a toroidal coil with concentrated windings on each stator pole. In this case, in addition to torque generating areas adjacent to the axial ends, a torque generating area is formed on the outer circumference of the stator 10 provided. These three torque generating areas may provide improved torque generation.

Although the disclosure is directed to, but not limited to, the present embodiment, it will be obvious to those skilled in the art that changes may be made without departing from the spirit of the present invention. Thus, all possible changes and equivalents of the embodiments shown are to be considered covered by the present invention.

LIST OF REFERENCE NUMBERS

1.

rotating electrical machine

10th

stator

11th

stator

12th

stator core

13th

holder

20th

rotor

20A.

first rotor section

20B.

second rotor section

21st

rotor core

22nd

arranged in the circumferential direction series of alternating first salient poles and second salient poles

23rd

Rotorwiclung

23a.

induction coil

23b.

field coil

24th

Rectifier circuit

30th

permanent magnet

31st

first salient pole (permanent magnet pole)

32nd

second salient pole (pole piece)

D1, D2

Diode (rectifier)

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

• JP 2012196095 A [0002, 0003]

Claims (9)

A rotary electric machine (1) comprising: a rotor (20) rotatably mounted about a rotation axis opposite to a stator (10), said stator being capable of generating a magnetic flux by energizing a stator winding (11), characterized in that: the rotor (20) comprises: first salient poles (31) having permanent magnets (30), a rotor winding (23) allowing the induction of currents in response to a high frequency harmonic superimposed with the magnetic flux when the high-frequency harmonic interacts with the rotor winding; and rectifiers (D1, D2) for rectifying the induced currents, and second salient poles (32) around which the rotor winding (23) is wound. Rotary electric machine behind Claim 1 wherein the rotor (20) comprises a circumferentially arranged series of alternating first salient poles (31) and second salient poles (32). Rotary electric machine behind Claim 1 or 2 wherein the rotor (20) comprises: a first rotor portion (20A) axially adjacent one side of the stator (10); and a second rotor portion (20B) axially adjacent to the opposite side of the stator (10). Rotary electric machine behind Claim 3 wherein the first and second rotor sections (20A, 20B) are arranged such that each of the first salient poles (31) on the first or second rotor section (20A, 20B) is connected to one of the second salient poles (32) on the other of the first or second rotor sections (20). 20A, 20B) is aligned. Rotary electric machine according to one of the preceding Claims 1 to 4 wherein the rotor winding (23) comprises: induction coils (23a) in each of which a current is induced by the interaction with the high frequency harmonic of the magnetic flux; and field coils (23b) arranged to conduct field currents generated by the rectification of the induction currents to magnetize the second salient poles (32). Rotary electric machine according to one of the preceding Claims 1 to 5 wherein the stator comprises stator cores (12) each surrounded by a coil of the stator winding (11), the stator cores (12) being magnetically separated from each other. Rotary electric machine according to one of the preceding Claims 1 to 6 wherein the rotor winding (23) is wound to magnetize the second salient poles (32) in a manner suitable for flux amplification to increase the air gap flux density between the rotor (20) and the stator (10) , Rotary electric machine behind Claim 4 wherein the rotor winding (23) is wound so as to magnetize the second salient poles (32) in a manner suitable for a flux amplification process to increase the air gap flux density between each of the first and second rotor sections (20A, 20B) and To increase stator (10). Rotary electric machine behind Claim 6 wherein the stator cores (12) are circumferentially arranged in a row at predetermined intervals, and the stator comprises a support (13) adapted to magnetically separate the stator cores (12).

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