JP2009250173A - Motor-driven compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor-driven compressor whose axial length can be shortened with a motor driving circuit cooling performance held highly efficient. <P>SOLUTION: Within the motor-driven compressor C, a compressing unit, an electric motor 18, and a motor driving circuit 41 are provided axially along a rotating shaft 17. An inside of a housing 10 is partitioned by a partition wall 13b into a first space S and a second space T. In the rotating shaft 17, its front end is supported by a bearing in a cantilevered manner and its rear end 17b is arranged in a position more retreated than an extremity of a coil end 21a toward a side of the rotor 22. A bulging portion 13c, bulging from a side of the motor driving circuit 41 to a side of the electric motor 18, is formed in part of the partition wall 13b and besides is housed and arranged at an inner circumferential side of the coil end 21a. Further, an electrolytic capacitor 44b and coil 44c of the motor driving circuit 41 are housed and arranged within the bulging portion 13c. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electric compressor including a compression unit, an electric motor, and a motor drive circuit.

  In an electric compressor including a compression unit, an electric motor, and a motor drive circuit, the inverter of the motor drive circuit includes a switching element, and generates a large amount of heat due to power loss of the switching element. For this reason, the improvement of the cooling property of the motor drive circuit in an electric compressor is desired. As an electric compressor which improved the cooling property of the motor drive circuit, the electric compressor of patent document 1 is mentioned, for example. The outer shell of the electric compressor is formed by joining a discharge housing made of a metal material containing aluminum, an intermediate housing, and a suction housing. In this electric compressor, a scroll-type compression portion is provided inside the discharge housing, and a rotation shaft is arranged inside the intermediate housing and the suction housing.

  One end of the rotating shaft is supported by a bearing provided in the suction housing, and the other end is supported by a bearing provided in the intermediate housing. A rotor is fixed around the rotation shaft, and a stator fixed to inner walls of the intermediate housing and the suction housing is disposed around the rotor.

The suction housing is formed with a partition wall that partitions the inside of the electric compressor into the compression portion side and the motor drive circuit side, and the opening of the suction housing is closed by a lid member. A motor drive circuit composed of an inverter is accommodated between the partition wall and the lid member, and the motor drive circuit is attached in close contact with the partition wall. The suction housing is formed with a suction port for sucking refrigerant gas sucked into the compression portion into the electric compressor. In the electric compressor of Patent Document 1, when the suction housing is cooled by the refrigerant gas sucked into the electric compressor from the suction port, the motor drive circuit attached to the suction housing is cooled. Yes.
JP 2000-291557 A

  By the way, in the electric compressor of patent document 1, in order to cool a motor drive circuit efficiently, it is necessary to stick a motor drive circuit to a partition wall. However, the partition wall is formed by a surface orthogonal to the axial direction in the electric compressor. For this reason, when the motor drive circuit is brought into close contact with the partition wall, the electrical components mounted on the motor drive circuit board are erected so as to extend from the partition wall to the lid member side along the axial direction of the rotation shaft. Thus, there has been a problem that the length of the electric compressor in the axial direction becomes longer.

  An object of the present invention is to provide an electric compressor capable of shortening the length of the electric compressor in the axial direction while improving the cooling performance of the motor drive circuit.

  In order to solve the above-described problems, an invention according to claim 1 includes an electric motor including a stator and a rotor, a compression unit that is driven by rotation of a rotating shaft that rotates integrally with the rotor, and the electric motor. A motor drive circuit for driving is housed in the housing, and the compression portion, the electric motor, and the motor drive circuit are disposed along the axial direction of the rotating shaft, and the inside of the housing is a partition wall Is divided into a first space in which the compression unit and the electric motor are accommodated and a second space in which the motor drive circuit is accommodated, and the motor drive circuit is thermally coupled to the partition wall. One end portion of the rotating shaft is cantilevered by a bearing on the compression portion side from the rotor, and the other end portion of the motor coil in the stator is A bulging portion that bulges from the motor drive circuit side toward the electric motor side is formed in a part of the partition wall. The protruding portion is accommodated and arranged on the inner peripheral side of the coil end, and further, a part of the motor drive circuit is accommodated and arranged inside the bulging portion. Here, “the motor drive circuit is thermally coupled to the partition wall” means that at least a part of the motor drive circuit is in direct contact with the partition wall so that the partition wall and the motor drive circuit can conduct heat. This means that the partition wall and the motor drive circuit can conduct heat when at least a part of the motor drive circuit is in contact with the partition wall via the heat conducting member.

  According to this, since the motor drive circuit is thermally coupled to the partition wall, when the partition wall is cooled by the refrigerant gas sucked into the first space, the motor drive circuit is cooled via the partition wall. can do. And in the electric compressor which made the cooling property of a motor drive circuit favorable, when a motor drive circuit is thermally couple | bonded with a partition wall, a part of motor drive circuit will extend along the axial direction of a rotating shaft. Will be erected. In the electric compressor of the present invention, the inside of the bulging portion accommodated and arranged on the inner peripheral side of the coil end is used as a space for accommodating a part of the motor drive circuit. Therefore, for example, the shaft of the electric compressor is compared with the case where the bulging portion is not formed on the partition wall and a part of the motor drive circuit is erected on the partition wall so as to extend in a direction away from the electric motor. The length in the direction can be shortened.

  In addition, an electrical component mounted on a substrate of the motor drive circuit may be accommodated and disposed inside the bulging portion. According to this, the inside of the bulging part can be used as a space for accommodating electrical components. Therefore, for example, the bulging portion is not formed in the partition wall, and the length of the electric compressor in the axial direction is longer than that in the case where the electric component is erected on the partition wall so as to extend away from the electric motor. Can be shortened.

  Further, on the substrate, as the electrical component, a high-size electrical component having a high height from the substrate and a low-size electrical component having a lower height than the high-size electrical component are mounted, and inside the bulging portion The above-mentioned high-sized electrical component may be accommodated. According to this, the board can be brought closer to the partition wall side and the length along the axial direction of the electric compressor is further shortened as compared with the case where the low-size electrical component is accommodated inside the bulging portion. be able to.

  In addition, the high-size electrical component is thermally coupled to the inner bottom surface of the bulge portion, and the low-size electrical component is heated on the outer peripheral side of the bulge portion in the partition wall via a heat conduction portion. May be combined. According to this, the low-sized electrical component is cooled by the refrigerant gas sucked into the first space through the partition wall and the heat conducting portion, and the motor drive circuit can be cooled well.

  ADVANTAGE OF THE INVENTION According to this invention, the length to the axial direction of an electric compressor can be shortened, making the cooling property of a motor drive circuit favorable.

  Hereinafter, an embodiment in which the present invention is embodied in an electric compressor mounted on a hybrid vehicle and used in a vehicle air conditioner will be described with reference to FIGS. 1 and 2. In the following description, for the “front” and “rear” of the electric compressor, the direction of the arrow Y shown in FIG.

  As shown in FIG. 1, the second housing component 12 is joined to the front end (one end) of the first housing component 11 that forms the housing 10 of the electric compressor C. The third housing component 13 is joined to the rear end (other end) of the first housing component 11, and the fourth housing component 14 is connected to the rear end (other end) of the third housing component 13. Are joined. Each of the first housing component 11, the second housing component 12, the third housing component 13, and the fourth housing component 14 is made of an aluminum alloy die casting.

  The first housing component 11 and the second housing component 12 are fastened together by four bolts B1 (only two bolts B1 are shown in FIG. 1), and the first housing component 11 and the third housing. The structural body 13 and the fourth housing structural body 14 are fastened together by four bolts B2 (only one bolt B2 is shown in FIG. 1). The housing 10 of the electric compressor C is formed by the first housing component 11, the second housing component 12, the third housing component 13, and the fourth housing component 14.

  A gasket G1 is interposed between the first housing component 11 and the second housing component 12, and a gasket G2 is interposed between the first housing component 11 and the third housing component 13. Has been. A first space S that is hermetically sealed is defined inside the first housing component 11, the second housing component 12, and the third housing component 13, and in the first space S The electric motor 18 and the compression part 23 are accommodated. Further, a seal member 26 is interposed between the third housing component 13 and the fourth housing component 14, and the inside of the third housing component 13 and the fourth housing component 14 is hermetically sealed. The second space T is partitioned and a motor drive circuit 41 for driving the electric motor 18 is accommodated in the second space T.

  A bearing housing member 15 is fixed on the front end side (one end side) of the first housing component 11, and two bearings 16 are housed in the center of the bearing housing member 15. In addition, a rotary shaft 17 is disposed in the first housing component 11, and a front end portion 17 a (one end portion) which is one end portion of the rotary shaft 17 is cantilevered and supported by two bearings 16. ing. The direction along the central axis L of the rotating shaft 17 is the axial direction of the electric compressor C.

  In the electric compressor C (in the first housing component 11), the compression portion 23 is disposed on the front end side (one end side), and the electric motor 18 is disposed on the rear end side (the other end side). Has been. Therefore, the front end portion 17 a which is one end portion of the rotating shaft 17 is cantilevered by the bearing 16. The electric motor 18 includes a stator 19 fixed to the inner surface of the first housing component 11 and a rotor 22 fixed to the rotary shaft 17 inside the stator 19. The electric motor 18 rotates the rotating shaft 17 via the rotor 22 by receiving power supplied to the stator 19.

  The stator 19 includes an annular stator core 20 and a motor coil 21 wound around the stator core 20. From the front end face 20a (one end face) facing the compression portion 23 side of the stator core 20 and the rear end face 20b (other end face) facing the third housing component 13 (motor drive circuit 41) side, the coil of the motor coil 21 The end 21a protrudes in an annular shape. In the rotor 22, the front end surface 22a (one end surface) facing the compression portion 23 side and the rear end surface 22b (other end surface) facing the third housing component 13 (motor drive circuit 41) side are electrically compressed. Along the axial direction of the machine C, it is in a position that is deeper (retreated) than the front end portions of the front and rear coil ends 21a. In the rotating shaft 17, the rear end portion 17 b that is the other end portion slightly protrudes from the rear end surface 22 b of the rotor 22. That is, the rear end portion 17 b of the rotating shaft 17 is disposed at a position that is retracted to the rotor 22 side from the tip end portion of the coil end 21 a of the motor coil 21. For this reason, the rear end side (other end side) which becomes the 3rd housing structure 13 side of the electric motor 18 is dented in the inner peripheral side of the coil end 21a.

  The compression unit 23 is a scroll type including a fixed scroll 23a and a movable scroll 23b. A refrigerant gas inlet 24 is formed on the rear end side (the other end side) of the first housing component 11. The compression unit 23 compresses the refrigerant gas by turning the movable scroll 23b with respect to the fixed scroll 23a according to the rotation of the rotary shaft 17. Accordingly, when the compression unit 23 is driven by the rotation of the rotating shaft 17 by the drive of the electric motor 18, the low-temperature and low-pressure refrigerant gas from the external refrigerant circuit (not shown) is electrically driven from the suction port 24 in the first space S. The air is sucked into the compression unit 23 via the vicinity of the motor 18. The refrigerant gas sucked into the compression unit 23 becomes high-temperature and high-pressure refrigerant gas by the compression action of the compression unit 23 and is discharged from the discharge port 25 formed in the second housing structure 12 to the external refrigerant circuit.

  As shown in FIG. 2, the third housing component 13 has a substantially circular shape provided on the front end side (one end side) of the peripheral wall portion 13 a and the peripheral wall portion 13 a forming a part of the housing 10. It is formed in a substantially bottomed cylindrical shape from the partition wall portion 13b formed. And in the 3rd housing structure 13, the partition wall part 13b closes the opening of the rear end side of the 1st housing structure 11, and partitions the inside of the electric compressor C into the 1st space S and the 2nd space T. Yes. Therefore, the partition wall portion 13 b of the third housing component 13 forms a partition wall that partitions the interior of the housing 10 of the electric compressor C into the first space S and the second space T. A connection terminal (not shown) is attached and fixed to the partition wall 13 b of the third housing component 13. A substrate 43 of the motor drive circuit 41 is electrically connected to one end of the connection terminal by a lead wire (not shown), and the stator 19 of the electric motor 18 is electrically connected to the other end of the connection terminal by a lead wire (not shown). It is connected to the.

  In the third housing component 13, the central portion of the partition wall 13 b has a bulge that bulges in a bottomed cylindrical shape from the motor drive circuit 41 side toward the electric motor 18 side along the axial direction of the electric compressor C. A protruding portion 13c is formed. And the inside of the bulging part 13c is dented toward the electric motor 18 side from the motor drive circuit 41 side, and the accommodation recessed part 30 which accommodates a part of the motor drive circuit 41 in the recessed part is formed. Therefore, the second space T includes the accommodating recess 30.

  The bulging portion 13c is accommodated and arranged on the inner peripheral side of the annular coil end 21a protruding from the rear end side (the other end side) of the electric motor 18. Therefore, the bulging length of the bulging portion 13c along the axial direction of the electric compressor C is slightly shorter than the length from the rear end surface 20b of the stator core 20 to the tip portion of the coil end 21a. The bulging portion 13c is formed so that a slight gap is formed between the front end surface 13d facing the rear end surface 22b of the rotor 22 and the rear end portion 17b of the rotary shaft 17 facing the front end surface 13d. It bulges toward 22. Further, the outer peripheral surface 13e of the bulging portion 13c is formed such that a slight gap is formed between the outer peripheral surface 13e and the inner peripheral surface of the coil end 21a facing the outer peripheral surface 13e.

  The motor drive circuit 41 includes an inverter and supplies power to the stator 19 of the electric motor 18 based on a command from an air conditioner ECU (not shown). The motor drive circuit 41 includes a flat substrate 43, and a switching element 44a, an electrolytic capacitor 44b, a coil 44c, and a driver 44d as a plurality of types of electrical components mounted on the surface of the substrate 43 on the partition wall 13b side. It has become. The driver 44d is an IC chip that intermittently controls the switching element 44a based on a command from the air conditioner ECU.

  The substrate 43 is fixed to the third housing component 13 by bolts or the like not shown so that the substrate 43 is parallel to the partition wall portion 13b, that is, the substrate 43 is orthogonal to the axial direction of the electric compressor C. Yes. The height h1 of the electrolytic capacitor 44b from the substrate 43 and the height h2 of the coil 44c are higher than the height h3 of the switching element 44a from the substrate 43. Then, the electrolytic capacitor 44b and the coil 44c can be grasped as high-sized electrical components having high heights h1 and h2 from the substrate 43, and the switching element 44a is replaced with the heights h1 and h2 of the electrolytic capacitor 44b and the coil 44c. It can be grasped as a low-size electrical component having a height h3 lower than that of

  Almost all of the electrolytic capacitor 44b and the coil 44c, which are high-sized electrical components, are accommodated in the accommodating recess 30 that is inside the bulging portion 13c. For this reason, the electrolytic capacitor 44 b and the coil 44 c are vertically placed so as to stand from the substrate 43 toward the electric motor 18 along the axial direction of the electric compressor C.

  The tip surface of the coil 44c is in contact with the inner bottom surface 13f of the bulging portion 13c via a potting having good thermal conductivity (not shown), and the coil 44c and the bulging portion 13c are thermally coupled via potting. ing. The tip surface of the electrolytic capacitor 44b is separated from the inner bottom surface 13f of the bulging portion 13c, and the peripheral surface of the electrolytic capacitor 44b is placed on the inner peripheral surface 13g of the bulging portion 13c via a potting with good thermal conductivity (not shown). The electrolytic capacitor 44b and the bulging portion 13c are in thermal contact with each other through potting. That is, the motor drive circuit 41 is thermally coupled to the bulging portion 13c that is a part of the partition wall portion 13b. Here, “the motor drive circuit 41 is thermally coupled to the bulging portion 13c (partition wall portion 13b)” means that at least a part of the motor driving circuit 41 is in direct contact with the bulging portion 13c. It means that it can conduct heat, or that can conduct heat when at least a part of the motor drive circuit 41 is in contact with the bulging portion 13c via a heat conducting member. In this embodiment, heat generated from the electrolytic capacitor 44b and the coil 44c, which are part of the motor drive circuit 41, is thermally conducted to the bulging portion 13c (partition wall portion 13b) through potting which is a heat conducting member. . For this reason, when a relatively low-temperature refrigerant gas is introduced into the first space S, the expanded portion 13c is cooled by the refrigerant gas, and the electrolytic capacitor 44b and the coil 44c are cooled via the expanded portion 13c. It has come to be.

  The switching element 44 a, which is a low-size electrical component, is disposed on the outer peripheral side from the central portion of the substrate 43. Between the partition wall part 13b and the switching element 44a, a heat conduction plate 33 as a heat conduction part and a potting with good heat conductivity (not shown) are interposed. The heat conduction plate 33 is formed in an annular shape from a metal material having high heat conductivity (aluminum in the embodiment). The thickness of the heat conduction plate 33 and the potting is a gap formed between the tip surface of the switching element 44a and the partition wall portion 13b in a state where the tip surface of the coil 44c is in contact with the inner bottom surface 13f of the bulging portion 13c. It is the same. And the switching element 44a and the partition wall part 13b are thermally couple | bonded via the heat conductive board 33 and potting. For this reason, when a relatively low-temperature refrigerant gas is introduced into the first space S, the partition wall 13b is cooled by the refrigerant gas, and the switching element 44a is cooled via the heat conducting plate 33 and potting. It has become so.

According to the above embodiment, the following effects can be obtained.
(1) The front end portion 17a of the rotating shaft 17 is cantilevered by the bearing 16 on the compression portion 23 side, the rear end portion 17b slightly protrudes from the rear end surface 22b of the rotor 22, and the rear end side of the electric motor 18 is The inner side of the annular coil end 21a is recessed. In addition, a bulging portion 13 c that bulges toward the electric motor 18 is formed in the partition wall portion 13 b that partitions the first space S and the second space T, and the bulging portion 13 c is used as a coil end 21 a in the electric motor 18. The housing was placed on the inner circumference side. And the electrolytic capacitor 44b and the coil 44c which form the motor drive circuit 41 were accommodated and arrange | positioned inside the bulging part 13c. For this reason, the electrolytic capacitor 44b and the coil 44c are cooled by the refrigerant gas sucked into the first space S through the bulging portion 13c, and the motor drive circuit 41 can be cooled well.

  The electrolytic capacitor 44b and the coil 44c are accommodated in the bulging portion 13c, and the inner peripheral side of the coil end 21a in the electric motor 18 can be used as an accommodating space for the electrolytic capacitor 44b and the coil 44c. For this reason, for example, the bulging portion 13c is not formed in the partition wall portion 13b, and compared with the case where the electrolytic capacitor 44b and the coil 44c are erected from the substrate 43 toward the fourth housing component 14 side. The length of the compressor C in the axial direction can be shortened. As a result, the electric compressor C can be reduced in size, and the mountability of the electric compressor C on a hybrid vehicle (vehicle) can be improved.

  (2) The electrolytic capacitor 44b and the coil 44c accommodated and disposed inside the bulging portion 13c are high-sized electrical components in which the heights h1 and h2 from the substrate 43 are higher than the height h3 from the substrate 43 of the switching element 44a. is there. For this reason, the board | substrate 43 can be brought close to the partition wall part 13b side compared with the case where a small electrical component like the switching element 44a is accommodated inside the bulging part 13c, and the axis | shaft of the electric compressor C The length along the direction can be further shortened.

  (3) The switching element 44a that is not housed in the housing recess 30 of the bulging portion 13c is thermally coupled to the outer peripheral side of the partition wall portion 13b via the heat conducting plate 33 and potting. For this reason, the switching element 44a is cooled by the refrigerant gas sucked into the first space S through the partition wall portion 13b and the heat conducting plate 33, so that the cooling of the motor drive circuit 41 can be improved. .

  (4) The third housing component 13 in which the bulging portion 13 c is formed is a separate body from the first housing component 11. And the 3rd housing structure 13 can be manufactured by adjusting the amount of swelling from the partition wall part 13b of the swelling part 13c. For this reason, when assembling the electric compressor C, it is possible to prevent the bulging portion 13 c housed on the rear end side of the electric motor 18 from contacting the rear end surface 22 b of the rotor 22 in the electric motor 18.

  (5) The switching element 44a, the electrolytic capacitor 44b, the coil 44c, and the driver 44d mounted on the substrate 43 are all mounted on the surface of the substrate 43 on the partition wall portion 13b side, and the substrate 43 on the fourth housing component 14 side. The surface is flat. For this reason, for example, compared with the case where the switching element 44a or the like is mounted on the surface of the substrate 43 on the fourth housing component 14 side, the peripheral wall of the third housing component 13 along the axial direction of the electric compressor C The length of the portion 13a can be shortened, and the length of the electric compressor C in the axial direction can be shortened.

In addition, you may change this embodiment as follows.
The electrical component housed and arranged inside the bulging portion 13c may be other than the electrolytic capacitor 44b and the coil 44c.

  ○ If the tip surface of the switching element 44a is in contact with the partition wall portion 13b with the tip surface of the high-size electrical component (coil 44c) in contact with the inner bottom surface 13f of the bulging portion 13c via potting, The heat conduction plate 33 and potting may be omitted.

  ○ Potting between the tip surface of the coil 44c, which is a high-size electrical component, and the inner bottom surface 13f of the bulging portion 13c, and between the peripheral surface of the electrolytic capacitor 44b, which is a high-size electrical component, and the inner peripheral surface 13g of the bulging portion 13c And potting between the switching element 44a, which is a low-sized electrical component, and the heat conducting plate 33 may be omitted. However, in general, electrical components often vary in height. Therefore, it is desirable to use potting to absorb the variation.

A rubber or resin sheet may be interposed between the switching element 44a and the partition wall part 13b as a heat conduction part, and this sheet is excellent in heat conductivity.
(Circle) you may provide the connection terminal which forms a part of motor drive circuit 41 in the bottom part of the bulging part 13c.

  In the housing 10 of the electric compressor C, the fourth housing component 14 is joined to the rear end of the first housing component 11, and the second space T and the first space are formed on the inner peripheral surface of the first housing component 11. A partition wall that partitions S may be integrally formed, and the third housing component 13 may be deleted. And a bulging part is formed in a partition wall, and a part of motor drive circuit 41 is accommodated inside a bulging part.

  ○ The bearing housing member 15 fixed on the front end side of the first housing component 11 and the two bearings 16 housed in the bearing housing member 15 are positioned on the inner peripheral side of the coil end 21a on the front end side. Also good. That is, the bearing housing member 15 and the bearing 16 may be disposed so as to approach the front end surface 22 a of the rotor 22. In this case, the axial length of the electric compressor C can be further reduced.

  ○ An electrolytic capacitor 44b, which is a high-sized electrical component, is placed horizontally on the substrate 43 so as to extend in a direction orthogonal to the axial direction of the electric compressor C, and almost all of the electrolytic capacitor 44b is placed in the housing recess 30 that is inside the bulging portion 13c. It may be accommodated. In this case, the circumferential surface of the electrolytic capacitor 44b is in contact with the inner bottom surface 13f of the bulging portion 13c via potting (not shown), and the electrolytic capacitor 44b and the bulging portion 13c are thermally coupled via potting. .

(Circle) the compression part 23 is not restricted to a scroll type, For example, a piston type and a vane type may be sufficient.
The electric compressor C may be mounted not on a hybrid vehicle but on a vehicle driven by an engine or an electric vehicle.

The electric compressor C is not used for a vehicle air conditioner but may be used for other air conditioners.
Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.

  (1) The high-size electrical component is thermally coupled to the inner peripheral surface of the bulge portion, and the low-size electrical component is disposed on the outer peripheral side of the bulge portion in the partition wall via a heat conduction portion. The electric compressor according to claim 3, wherein the electric compressor is thermally coupled.

The longitudinal cross-sectional view which shows the electric compressor of embodiment. The expanded sectional view which shows a partition wall part, a bulging part, and a motor drive circuit.

Explanation of symbols

  C ... electric compressor, S ... first space, T ... second space, h1, h2, h3 ... height, 10 ... housing, 13b ... partition wall part forming partition wall, 13c ... bulge part, 13f ... Inner bottom surface, 16 ... bearing, 17 ... rotating shaft, 17a ... front end as one end, 17b ... rear end as the other end, 18 ... electric motor, 19 ... stator, 21 ... motor coil, 21a DESCRIPTION OF SYMBOLS ... Coil end, 22 ... Rotor, 23 ... Compression part, 33 ... Heat conduction board as a heat conduction part, 41 ... Motor drive circuit, 43 ... Board | substrate, 44a ... Switching element as a low-size electrical component, 44b ... High-size electricity Electrolytic capacitor as a part, 44c... Coil as a high-size electrical part.

Claims (4)

An electric motor including a stator and a rotor, a compression unit that is driven by rotation of a rotary shaft that rotates integrally with the rotor, and a motor drive circuit that drives the electric motor are housed in a housing, and the rotary shaft The compression section, the electric motor, and the motor drive circuit are disposed along the axial direction of the motor, and a first space in which the compression section and the electric motor are accommodated by a partition wall in the housing and the motor drive An electric compressor that is partitioned into a second space in which a circuit is accommodated, and wherein the motor drive circuit is thermally coupled to the partition wall;
One end portion of the rotating shaft is cantilevered by a bearing on the compression portion side from the rotor, and the other end portion is disposed at a position where the end of the motor coil coil end of the stator is retracted to the rotor side. Has been established,
A bulge portion that bulges from the motor drive circuit side toward the electric motor side is formed in a part of the partition wall, and the bulge portion is accommodated and disposed on the inner peripheral side of the coil end, and An electric compressor in which a part of the motor drive circuit is accommodated and disposed inside a bulging portion.   The electric compressor according to claim 1, wherein an electric component mounted on a substrate of the motor drive circuit is accommodated and disposed inside the bulging portion.   On the substrate, as the electrical component, a high-size electrical component having a high height from the substrate and a low-size electrical component having a height lower than the high-size electrical component are mounted, and the bulging portion has the inside The electric compressor according to claim 2, wherein high-size electric parts are accommodated.   The high-size electrical component is thermally coupled to the inner bottom surface of the bulge portion, and the low-size electrical component is thermally coupled to the outer peripheral side of the bulge portion in the partition wall via a heat conduction portion. The electric compressor according to claim 3, wherein the electric compressor is coupled.

Images