JP2003120532A - Electric compressor - Google Patents

Abstract

(57) [Problem] To electrically connect a motor drive circuit and a motor. SOLUTION: A bending portion 121 is provided on a drive circuit side terminal 120. As a result, the motor-side terminal 110 and the drive-circuit-side terminal 1 depend on the dimensional tolerances and assembly variations of each part.
Even if the position is displaced from the position 20, the displacement of the terminals 110 and 120 can be absorbed by the deformation of the curved portion 121. Therefore, since the two terminals 110 and 120 can be securely joined, the joining (welding) reliability of the terminals is improved, so that the joining strength and vibration resistance of the two terminals 110 and 120 can be improved, and the electric compression can be performed. The reliability (lifetime) of the machine 100 can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric compressor in which a compression mechanism for sucking and compressing a fluid, an electric motor for driving the compression mechanism, and a motor drive circuit for driving the motor are integrated. It is effective when applied to vehicle air conditioners and home air conditioners.

[0002]

2. Description of the Related Art As an electric compressor, for example, in the invention described in Japanese Patent No. 3086819, a semiconductor module for driving a motor is mounted on a side surface (cylindrical surface) of the electric compressor to form a semiconductor. The module and electric compressor are integrated. At this time, each terminal of the semiconductor module and the motor is directly connected.

In view of the above points, the present invention has an object to electrically connect a motor drive circuit such as a semiconductor module and a motor with a novel configuration different from the above patented invention.

[0004]

In order to achieve the above object, the present invention provides a compression mechanism (Cp) for sucking and compressing a fluid, and an electric motor for driving the compression mechanism (Cp). A motor-type compressor (Mo) and a motor drive circuit (Ic) for driving the motor (Mo) are integrated, and a motor-side terminal (110) electrically connected to the motor (Mo). ) And the drive circuit side terminal (120) electrically connected to the motor drive circuit (Ic) are joined to electrically connect the motor (Mo) and the motor drive circuit (Ic). , Both terminals (110, 12
The joint part (0) is molded with an insulating resin, and further, at least one of the motor side terminal (110) and the drive circuit side terminal (120) has a curved portion (121) that is curved. Is formed.

As a result, even if the positions of both terminals (110, 120) are displaced due to dimensional tolerances of each component and assembly variations, the curved portion (121) is deformed and the positions of both terminals (110, 120) are displaced. Can be absorbed.

Therefore, since both terminals (110, 120) can be reliably joined, the joining reliability of the terminals is improved, so that the joining strength and vibration resistance of both terminals (110, 120) can be improved. Therefore, the reliability (life) of the electric compressor can be improved.

The bending portion (121) may be provided on the drive circuit side terminal (120) as in the second aspect of the invention.

According to the third aspect of the invention, a compression mechanism (Cp) for sucking and compressing the fluid, an electric motor (Mo) for driving the compression mechanism (Cp), and a motor drive circuit for driving the motor (Mo). A motor-side terminal (110) electrically connected to a motor (Mo) and a drive circuit electrically connected to the motor drive circuit (Ic), which is an electric compressor integrated with (Ic). The side terminals (120) are screwed together to electrically connect the motor (Mo) and the motor drive circuit (Ic), and both terminals (110, 12) are connected.
The joint part of 0) is characterized by being molded with an insulating resin.

As a result, when the terminals (110, 120) are joined together, the heat during welding is transferred to the semiconductor components in the motor drive circuit (Ic) via the drive circuit side terminal (120). Therefore, there is no problem that the semiconductor component in the motor drive circuit (Ic) is thermally damaged by the heat during welding.

Incidentally, the reference numerals in parentheses of the above-mentioned respective means are examples showing the correspondence with the concrete means described in the embodiments described later.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment)
The present invention is applied to an electric compressor for a vehicle air conditioner (vapor compression refrigeration cycle), and FIG. 1 is a front view (partial cross section) of an electric compressor 100 according to the present embodiment. FIG. 2 is a top view of FIG.

The electric compressor 100 is a motor drive circuit Ic including a scroll type compression mechanism Cp for sucking and compressing refrigerant, a DC brushless type electric motor Mo for driving the compression mechanism Cp, and an inverter circuit for driving the motor Mo.
The compression mechanism Cp and the motor Mo are integrated coaxially and side by side in series.

The motor drive circuit Ic has a compression mechanism C.
Of the housing housing p and the motor Mo, the compression mechanism Cp and the motor M are attached to the outer surface (motor Mo side) of the cylindrical motor housing 101 by a bolt.
It is integrated with o.

In the electric compressor 100, the motor drive circuit Ic sandwiches the motor Mo, and the engine 200 for traveling is used.
It is assembled and fixed to the crankcase of a traveling engine (not shown) with bolts so as to be located on the opposite side. In this example, the electric compressor 100 is attached to the crankcase, but it may be attached to the vehicle body in an electric vehicle or a hybrid vehicle that uses an electric motor as a drive source.

By the way, the motor drive circuit Ic and the motor M
As shown in FIG. 1, the o is electrically connected to the motor side terminal 110 electrically connected to the motor Mo and the drive circuit side terminal 120 electrically connected to the motor drive circuit Ic. Both terminals 110 and 12 are connected
The joint portion of 0 is molded (sealed) with an insulating resin (for example, epoxy resin, polyurethane resin, polyamide resin, etc.).

Here, the drive circuit side terminal 120 is the motor M.
The motor-side terminal 110 is a rod-shaped member extending substantially parallel to the axial direction of the motor Mo, and the motor-side terminal 110 is a rod-shaped terminal extending substantially parallel to the radial direction of the motor Mo. They are joined by a thermal joining method such as soldering or soldering. Both terminals 110 and 120 are made of a conductive metal such as an aluminum-based or iron-based metal.

At least one of the motor-side terminal 110 and the drive-circuit-side terminal 120 (the drive-circuit-side terminal 120 in this embodiment) is provided with a curved portion 121 which is curved in a substantially U shape. There is.

The base 111 to which the motor-side terminal 110 is fixed is composed of the base 111 and the motor housing 101.
Is fixed by bolts in a state where the gap is hermetically sealed by a gasket 112 disposed between and, and a through hole (not shown) into which the motor side terminal 110 is inserted and which is formed in the base 111 is glass-sealed. .

Next, the features (effects) of this embodiment will be described.

In this embodiment, since the drive circuit side terminal 120 is provided with the curved portion 121, the curved portion 121 is deformed even if the terminals 110 and 120 are displaced due to dimensional tolerances and assembly variations of each component. This makes it possible to absorb the positional deviation between the terminals 110 and 120.

Therefore, since the terminals 110 and 120 can be reliably joined to each other, the joining (welding) reliability of the terminals is improved, so that the joining strength and vibration resistance of both terminals 110 and 120 can be improved. The reliability (life) of the electric compressor 100 can be increased.

In this embodiment, the drive circuit side terminal 1
Although the bending portion 121 is provided in the bending portion 121 in FIG. 20, the present embodiment is not limited to this, and both terminals 110,
12 is provided with a curved portion 121, or the motor side terminal 110
The curved portion 121 may be provided only in the area. Incidentally, when the curved portion 121 is provided on the motor-side terminal 110, it is desirable that the motor-side terminal 110 has a thin plate shape like the drive circuit-side terminal 120.

(Second Embodiment) In the first embodiment, the motor side terminal 110 and the drive circuit side terminal 120 are welded, but in the present embodiment, as shown in FIGS.
0 and 120 are screwed together.

Specifically, a male screw 113 is formed on the motor side terminal 110, while a hole (not shown) into which the motor side terminal 110 is inserted is formed on the drive circuit side terminal 120.
The nut 130 is screwed into the male screw 113 of the motor side terminal 110 to connect the terminals 110 and 120 together.

As a result, when the terminals 110 and 120 are joined, they are joined (welded) via the drive circuit side terminal 120.
Since the heat at the time is not transferred to the semiconductor component in the motor drive circuit Ic, the problem that the semiconductor component in the motor drive circuit Ic is thermally damaged by the heat at the time of joining (welding) does not occur.

In FIG. 3, the motor side terminal 110 is stepped so that a male screw is formed on the small diameter portion 114, and the driving side terminal 120 is sandwiched between the large diameter portion 115 and the nut 130. It is fixed to the motor side terminal 110. Further, in FIG. 4, a large diameter portion 115 is formed by inserting a cylindrical collar 131 into the motor side terminal 110.

Incidentally, in the present embodiment, by making the size of the hole formed in the drive circuit side terminal 120 into which the motor side terminal 110 is inserted larger than the size of the male screw 113, the positional deviation is absorbed. Similar to the embodiment, the bending portion 1
21 may be provided on at least one of the terminals 110 and 120.

(Other Embodiments) In the above-mentioned embodiments, the motor drive circuit Ic is mounted on the motor Mo side, but the present invention is not limited to this, and the motor drive circuit Ic is mounted on the compression mechanism Cp side. May be assembled.

In the above embodiment, the DC brushless motor is used as the motor Mo, but the present invention is not limited to this.

In the above embodiment, the compression mechanism Cp is used.
As the above, a scroll type compression mechanism is adopted, but the present invention is not limited to this.

Further, the application of the electric compressor 100 according to the present invention is not limited to the vehicle air conditioner, but can be applied to other uses such as a refrigerator.

[Brief description of drawings]

FIG. 1 is a front view (partial cross section) of an electric compressor according to a first embodiment of the present invention.

FIG. 2 is a top view of FIG.

FIG. 3 is a front view (partial cross section) of an electric compressor according to a second embodiment of the present invention.

FIG. 4 is a front view (partial cross section) of an electric compressor according to a modified example of the second embodiment of the present invention.

[Explanation of symbols]

100 ... Electric compressor, 110 ... Motor side terminal, 120 ...
Drive circuit side terminals, 121 ... Curved portion, Ic ... Motor drive circuit, Mo ... Motor, Cp ... Compression mechanism.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kenji Iriyama             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO (72) Inventor Hiroyuki Kawada             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO (72) Inventor Yuji Takeo             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO F-term (reference) 3H003 AA05 AB01 AC03 AD03 CF02

Claims (3)

[Claims] 1. A compression mechanism (Cp) for sucking and compressing a fluid,
An electric motor (M for driving the compression mechanism (Cp)
o) and a motor drive circuit (Ic) for driving the motor (Mo), which is an electric compressor, and includes a motor side terminal (110) electrically connected to the motor (Mo). , A drive circuit side terminal (120) electrically connected to the motor drive circuit (Ic) is joined,
The motor (Mo) and the motor drive circuit (Ic) are electrically connected, and both terminals (110, 1)
The joint part of 20) is molded with an insulating resin, and further, at least one of the motor side terminal (110) and the drive circuit side terminal (120) has a curved curved portion ( 121) is formed, The electric compressor characterized by the above-mentioned. 2. The motor drive circuit (Ic) is assembled and fixed to an outer wall portion of a housing (101) of the motor (Mo), and the drive circuit side terminal (120) is arranged in an axial direction of the motor (Mo). The terminals (110) on the motor side extend substantially parallel to each other, and the terminals (110) on the motor side extend substantially parallel to the radial direction of the motor (Mo). The electric compressor according to claim 1, wherein the bending portion (121) is provided on the drive circuit side terminal (120). 3. A compression mechanism (Cp) for sucking and compressing a fluid,
An electric motor (M for driving the compression mechanism (Cp)
o) and a motor drive circuit (Ic) for driving the motor (Mo), which is integrated, and includes a motor side terminal (110) electrically connected to the motor (Mo). , The drive circuit side terminal (120) electrically connected to the motor drive circuit (Ic) is screw-coupled, and the motor (Mo) and the motor drive circuit (Ic)
And are electrically connected, and both terminals (11
The electric compressor is characterized in that the joint part (0, 120) is molded with an insulating resin.