JP7113945B1 - Rotating electric machine - Google Patents

Abstract

An object of the present invention is to obtain a rotating electric machine in which the size in the axial direction is reduced while ensuring the cooling performance of a power module by means of a coolant passage. A motor section having a rotating shaft, a rotor, a stator, and a bracket; an inverter section having a power module, a control module, and a cooler; A connecting board having terminals connected to a stator winding at one end and a power module at the other end, and a cooler having an upper lid in which a coolant passage is formed and a lower lid which closes the opening of the coolant passage. An upper lid screw hole provided in the upper lid, a lower lid first through hole provided in the lower lid facing the upper lid screw hole, and a lower lid first through hole screwed into the upper lid screw hole The lower cover is fixed to the upper cover by one screw, the connecting board is provided with a board through hole or a board recess in a portion facing the head of the first screw, and the head of the first screw is the board through hole or board recess. It has a portion located inside. [Selection drawing] Fig. 1

Description

The present application relates to a rotating electric machine.

A controller-integrated rotating electrical machine in which a motor section, which is a rotating electrical machine main body having a rotor and a stator, and an inverter section that includes a power circuit section and controls power supplied to the motor section are integrated. , are installed in vehicles such as automobiles. In order to effectively cool the power module, the field module, and the like included in the power circuit section, the inverter section is generally provided with a cooler having a coolant passage through which a coolant flows. An air passage is formed between the inverter section and the motor section for passing cooling air generated by an air-cooling fan of the rotor. A cooler is provided so as to face an air passage, and a configuration is disclosed in which fins that protrude greatly toward the air passage are formed on the cooler (see, for example, Patent Document 1).

By protruding the fins into the air passage, heat generated in the power module, the field module, etc. is dissipated by the coolant passage and the fins. The power module and the field module can be efficiently cooled by providing the coolant passage and the fins.

JP 2017-11999 A

In Patent Document 1, the large fins are provided in the air passage, so the power module can be efficiently cooled. However, since the large fins are formed in the air passage between the inverter section and the motor section, the distance between the inverter section and the motor section increases, so the size of the controller-integrated rotary electric machine in the axial direction increases. There was a problem. In addition, in order to reduce the axial size of the controller-integrated rotating electric machine with a configuration in which large fins are formed, the axial size of the cooler must be reduced. In that case, the size of the coolant passage in the axial direction is reduced. If the size of the coolant passage, which is provided closer to the power module than the fins and is greatly related to the cooling performance of the power module, is reduced, there is a problem that the cooling performance of the power module deteriorates.

SUMMARY OF THE INVENTION Accordingly, an object of the present application is to obtain a rotating electric machine in which the size in the axial direction is reduced while ensuring the cooling performance of the power module by means of the coolant passage.

A rotating electrical machine disclosed in the present application includes a rotating shaft, a rotor that has a field core wound with a field winding and rotates integrally with the rotating shaft, and is disposed radially outside the field core, A stator having a stator core wound with stator windings, and a bracket covering the outside of the field core and the stator core and holding one end side and the other end side of a rotating shaft via bearings. a power module having a switching element for turning on and off the current supplied to the stator winding; a control module having a control circuit for controlling the switching element; and a cooler for cooling the power module. , an inverter section arranged on the other side of the bracket in the axial direction and fixed to the bracket; a terminal connected to the power module; and a connecting board having a holding member that holds the terminal, the holding member being fixed to the bracket; an upper cover formed with a cooling liquid passage recessed on the other side in the axial direction on one side surface of the cooling liquid passage, and a lower cover closing the opening of the cooling liquid passage on one side in the axial direction, An upper lid screw hole provided in the outer peripheral portion of one side surface of the upper lid in the axial direction, a lower lid first through hole provided in the portion of the lower lid facing the upper lid screw hole, and a lower lid first through hole. The lower cover is fixed to the upper cover by the first screw threaded through the upper cover screw hole, and the connecting board is a portion facing the head of the first screw on the other side surface in the axial direction of the connecting board. is provided with a board through hole or board recess, and the head of the first screw has a portion located inside the board through hole or board recess.

According to the rotating electric machine disclosed in the present application, a motor section provided with a rotating shaft, a rotor, a stator, and a bracket; an inverter section provided with a power module, a control module, and a cooler; the motor section and the inverter section; and a connecting board having a terminal connected to a stator winding at one end and a power module at the other end. The upper lid screw hole provided in the upper lid, the lower lid first through hole provided in the lower lid facing the upper lid screw hole, and the upper lid screw through the lower lid first through hole The lower cover is fixed to the upper cover by the first screw screwed into the hole, the connecting board is provided with a board through hole or a board recess in a portion facing the head of the first screw, and the head of the first screw is Since the rotary electric machine has a portion arranged inside the board through-hole or the board recess, the size of the rotary electric machine in the axial direction can be reduced. In addition, since the rotary electric machine is miniaturized without shrinking the size of the coolant passage in the axial direction, it is possible to ensure the cooling performance of the power module by the coolant passage.

1 is a cross-sectional view showing an outline of a rotating electric machine according to Embodiment 1; FIG. FIG. 2 is a plan view showing the inverter section side of the rotating electric machine according to the first embodiment; FIG. 3 is a cross-sectional view illustrating connection between the stator and the inverter section of the rotary electric machine according to Embodiment 1; FIG. 3 is a plan view showing the motor section side of the inverter section of the rotary electric machine according to the first embodiment; 2 is a plan view showing the inverter section side of the motor section of the rotating electric machine according to the first embodiment; FIG. FIG. 4 is a cross-sectional view of another rotary electric machine according to Embodiment 1 at the same position as in FIG. 3 ; FIG. 7 is a cross-sectional view showing a main part of a rotating electric machine according to Embodiment 2; FIG. 12 is a plan view showing the motor section side of the inverter section of the rotary electric machine according to Embodiment 3; FIG. 11 is a cross-sectional view showing a main part of a rotating electric machine according to Embodiment 3; FIG. 11 is a plan view showing a lower cover of the rotary electric machine according to Embodiment 3; FIG. 11 is a cross-sectional view of the main part of the lower lid taken along the line AA of FIG. 10;

A rotating electric machine according to an embodiment of the present application will be described below with reference to the drawings. In each figure, the same or corresponding members and parts are denoted by the same reference numerals.

Embodiment 1.
1 is a cross-sectional view showing an outline of the rotary electric machine 1 according to Embodiment 1, FIG. 2 is a plan view showing the inverter section 40 side of the rotary electric machine 1 with the rear cover 15 removed, and FIG. 3 is a stator of the rotary electric machine 1. 4 is a plan view showing the motor section 30 side of the inverter section 40 of the rotary electric machine 1, and FIG. 5 is the inverter section 40 side of the motor section 30 of the rotary electric machine 1. 6 is a plan view showing a rear bracket 5 to which a connecting board 18 is attached, and FIG. 6 is a cross-sectional view of another rotating electrical machine 1 according to Embodiment 1 at a position equivalent to FIG. In FIG. 2, components inside the inverter section 40 are indicated by dashed lines. The rotary electric machine 1 is a controller-integrated rotary electric machine 1 including a motor section 30 and an inverter section 40 . The motor section 30 has a rotor 2 and a stator 3 and operates as an electric motor that drives an internal combustion engine (not shown). Alternatively, the motor unit 30 functions as a generator that is driven by the internal combustion engine to generate electricity. The inverter section 40 is arranged side by side with the motor section 30 on the other side of the motor section 30 in the axial direction, and controls the electric power supplied to the motor section 30 . The inverter section 40 is fixed to the motor section 30, and the motor section 30 and the inverter section 40 are integrated.

<Motor unit 30>
The motor unit 30 accommodates the rotating shaft 11, the rotor 2 that rotates integrally with the rotating shaft 11, the stator 3 arranged outside the rotor 2, and holds the rotating shaft 11 rotatably. and a bracket.

The rotor 2 has a field winding 2a and a field core 2b around which the field winding 2a is wound. The stator 3 arranged radially outside the field core 2b has a multi-phase stator winding 3a and a stator core 3b around which the stator winding 3a is wound. The multi-phase stator windings 3a are, for example, one set of three-phase windings or two sets of three-phase windings, but are not limited to these, and are set according to the type of rotating electric machine. The bracket covers the outside of the field core 2b and the stator core 3b. The bracket includes a front bracket 4 and a rear bracket 5. The front bracket 4 holds one end side of the rotating shaft 11 via the bearing 7 and covers the front side, which is one side of the rotor 2 and the stator 3 . The rear bracket 5 holds the other end side of the rotating shaft 11 via the bearing 8 and covers the rear side, which is the other side of the rotor 2 and the stator 3 . The front bracket 4 and the rear bracket 5 are axially spaced apart and connected by bolts 5a.

The rotating shaft 11 has a pulley 12 at one end of the rotating shaft 11 protruding from the through hole of the front bracket 4 . The pulley 12 gives and receives torque bi-directionally between the rotor 2 and an external internal combustion engine (not shown). The pulley 12 and the internal combustion engine are connected via a belt (not shown). The rotating shaft 11 has a slip ring 13 on the other end side of the rotating shaft 11 protruding from the through hole of the rear bracket 5 . The slip ring 13 and the field winding 2a are electrically connected, and a field current is supplied from the slip ring 13 to the field winding 2a. A brush 16, which slides a slip ring 13 and supplies current to the field winding 2a, is held by a brush holder 16a. The brush holder 16a is arranged in a space through which the rotating shaft 11 provided in the center of the inverter section 40 penetrates after the inverter section 40 is mounted on the motor section 30 before the rear cover 15 is attached. The brush holder 16 a is fixed to the inverter section 40 .

An air cooling fan 20 is fixed to the front end face of the field core 2 b of the rotor 2 . An air cooling fan 21 is fixed to the rear end face of the field core 2 b of the rotor 2 . Air-cooling fan 20 and air-cooling fan 21 rotate integrally with rotor 2 . Cooling air is generated as the air-cooling fans 20 and 21 rotate to cool the inside of the bracket. A gap portion serving as a cooling gas passage 22 is provided between the cooler 37 of the inverter section 40 and the rear bracket 5 , and the cooling air passes through the cooling gas passage 22 to cool the cooler 37 .

The magnetic pole position detection sensor 6 is composed of a sensor stator 6a and a sensor rotor 6b. The rotary shaft 11 has a sensor rotor 6b between the slip ring 13 and the bearing 8 on the other end side of the rotary shaft 11 protruding from the rear bracket 5 . The sensor rotor 6b rotates integrally with the rotating shaft 11 and is formed of an iron core. The sensor stator 6 a is arranged coaxially with the sensor rotor 6 b and provided on the upper lid 31 of the inverter section 40 . The magnetic pole position detection sensor 6 detects the magnetic pole position of the rotating shaft 11, that is, the rotor 2 from the position of the sensor rotor 6b.

<Inverter unit 40>
The inverter unit 40 cools the power module 9 and the field module 10 that supply electric power to the motor unit 30, the control module 17 that controls the power module 9 and the field module 10, and the power module 9 and the field module 10. It comprises a cooler 37, a case 14 having a terminal 14a electrically connecting the power module 9 and the motor section 30, and a rear cover 15 covering these members from the rear side and the radially outer side. Inverter unit 40 is arranged on the other side of rear bracket 5 in the axial direction and fixed to rear bracket 5 . In this embodiment, the inverter section 40 has six power modules 9, but the number of power modules 9 is not limited to this.

The power module 9 includes switching elements and peripheral circuits. The switching element is arranged on a lead frame that forms electrical wiring, and is sealed together with a peripheral circuit with a resin material. An AC terminal 9a, a ground terminal 9b, an input terminal 9c, and a control terminal 9d included in the power module 9 are exposed from the resin material. The AC terminal 9a is connected to the stator lead wire 3c through the terminal 14a and the terminal 19. As shown in FIG. The input terminal 9c is connected to an external DC power supply. The switching element turns on and off the current supplied from the DC power supply to the stator winding 3a during driving to supply the stator current to the stator winding 3a. The switching element rectifies the stator current during power generation. The power module 9 is arranged on the surface on the other side in the axial direction of the upper lid 31 of the cooler 37 and is thermally connected to the upper lid 31 .

The field module 10 includes switching elements and peripheral circuits. The switching element is arranged on a lead frame that forms electrical wiring, and is sealed together with a peripheral circuit with a resin material. A terminal 10a, a ground terminal 10b, a terminal 10c, and a control terminal 10d included in the field module 10 are exposed from the resin material. Terminal 10a is connected to field winding 2a via terminal 14b, brush 16 and slip ring 13. FIG. Ground terminal 10 b is electrically connected to upper lid 31 . Terminal 10c is connected to an external DC power supply. The switching element controls the field current by turning on and off the current supplied to the field winding 2a. The field module 10 is arranged on the surface on the other side in the axial direction of the upper lid 31 of the cooler 37 and is thermally connected to the upper lid 31 .

The control module 17 comprises control circuitry for controlling the power module 9 and the field module 10 . The control module 17 is provided by, for example, a board on which electronic components are mounted. The control module 17 is arranged on the other side in the axial direction of the power module 9 and the field module 10 with a space therebetween. A control terminal 9 d of the power module 9 and a control terminal 10 d of the field module 10 are connected to the control module 17 . Signal wiring of the magnetic pole position detection sensor 6 is connected to the control module 17 .

The cooler 37 includes an upper lid 31, a lower lid 32, and a nipple 33 as a refrigerant supply/discharge portion. The power module 9 and the field module 10 are thermally connected to the other side surface of the upper cover 31 in the axial direction, and a coolant passage 31a recessed toward the other side in the axial direction is formed on the one side surface of the upper cover 31 in the axial direction. be done. A plate-shaped lower lid 32 is provided so as to block the opening on one side in the axial direction of the coolant passage 31a. As shown in FIG. 1, an upper lid screw hole 31c provided in the outer peripheral portion of one side surface of the upper lid 31 in the axial direction, and a lower lid first screw hole 31c provided in the portion of the lower lid 32 facing the upper lid screw hole 31c. The lower lid 32 is fixed to the upper lid 31 by the through hole 32a and the first screw 34 screwed into the upper lid screw hole 31c through the lower lid first through hole 32a. By fixing the lower lid 32 to the upper lid 31, the channel 36 is sealed. In FIG. 4 , hatched portions surrounded by dashed lines are portions where the coolant flows in the cooler 37 , and are the inner portion of the nipple 33 and the flow path 36 . A sealing agent may be arranged around the flow path 36 .

The upper lid 31 and the lower lid 32 are made of a metal material such as aluminum. The nipple 33 is provided on the side surface of the upper lid 31 and supplies and discharges the coolant to and from the flow path 36 surrounded by the coolant passage 31 a and the lower lid 32 . Water, antifreeze, or ethylene glycol liquid, for example, is used as the coolant. The upper lid 31 is cooled by the refrigerant, and the power module 9 and the field module 10 thermally connected to the upper lid 31 are also cooled by the refrigerant. The reason why the cooler 37 is configured by separating the upper lid 31 and the lower lid 32 will be described. When forming the arcuate coolant passage 31a in an integral structure, it is possible to produce it by casting using a core, but such a production method is expensive and has low productivity. It is also difficult to bore the arc-shaped coolant passage 31a. Therefore, the cooler 37 is configured by separating the upper lid 31 and the lower lid 32 .

The case 14 surrounds the power module 9, the field module 10, and the control module 17 from the radial outside. The case 14 is made of an insulating resin material. The resin material is, for example, polyphenylene sulfide. As shown in FIG. 2, the case 14 is electrically connected to the power module 9 on the other end side and has a terminal 14a protruding from the case 14 on one end side. The terminal 14 a is a terminal for connecting the power module 9 and the motor section 30 . The terminal 14a is provided integrally with the case 14 by insert molding.

<Connection Configuration Between Stator 3 and Inverter Unit 40>
A configuration of electrical connection between the stator 3 and the inverter section 40 will be described. The rotating electric machine 1 includes a connecting board 18 at least partially arranged between the motor section 30 and the inverter section 40, as shown in FIG. The connecting board 18 has terminals 19 and holding members 18a. The terminal 19 is insert-molded in a holding member 18a that holds the terminal. The terminal 19 has one end connected to the stator winding 3a at a connection point 19a and the other end connected to the power module 9 at a connection point 19b. The connecting board 18 is fixed to the rear bracket 5 by a second screw 35 at the holding member 18a.

Details of connection will be described with reference to FIG. A stator lead wire 3c, which is an end portion of the stator winding 3a, penetrates the wall surface of the rear bracket 5 on the inverter section 40 side. The stator lead wire 3c passes through the connecting board 18 from one side to the other side in the axial direction. A portion of the stator lead wire 3c protruding from the connecting board 18 to the other side in the axial direction is connected to a connection portion 19a of the terminal 19 by welding, for example. After this connection, the inverter section 40 before the rear cover 15 is attached is attached to the rear side of the rear bracket 5 in the axial direction. The lower lid 32 is provided with a lower lid second through hole 32b in a portion facing the protrusion of the stator lead wire 3c and the connecting portion 19a of the terminal 19 on one side surface of the lower lid 32 in the axial direction. The upper lid 31 has a hole portion 31b that communicates with the lower lid second through hole 32b and is recessed on the other side in the axial direction. As shown in FIG. 4, the hole 31b is provided at a location that does not interfere with the arrangement of the flow path 36. As shown in FIG. As shown in FIG. 3, the projecting portion of the stator lead wire 3c and the connecting portion 19a of the terminal 19 have a portion that passes through the lower cover second through hole 32b and is arranged inside the hole portion 31b.

With this configuration, the size of the rotary electric machine 1 in the axial direction is reduced compared to the case where the hole portion 31b is not provided, so the size of the rotary electric machine 1 can be reduced. Moreover, the cooler 37 can be made lighter by providing the hole portion 31b.

One end side of the terminal 14a provided in the case 14 and a connecting portion 19b of the terminal 19 are connected by a screw 19c. The AC terminal 9a of the power module 9 and the other end side of the terminal 14a are joined by welding, for example. As shown in FIG. 2, the ground terminal 9b of the power module 9 is fixed to the upper lid 31 with screws (not shown). The ground terminal 9b and the upper lid 31 are electrically connected, and the upper lid 31 is grounded.

<Arrangement of first screw 34>
Arrangement of the first screw 34, which is the main part of the present application, will be described. The connecting board 18 is provided with a board through hole or a board recess in a portion of the surface on the other side in the axial direction of the connecting board 18 that faces the head of the first screw 34 . The head of the first screw 34 has a portion located inside the board through hole or recess. In this embodiment, as shown in FIG. 5, five board through holes 18b are provided in the connecting board 18, and as shown in FIG. It is The board through hole 18b may be formed in the holding member 18a at the same time when the terminal 19 is insert-molded, or may be formed by machining after molding. A board concave portion may be used instead of the board through hole 18b, but since the through hole does not need to be manufactured with consideration of the depth, unlike the concave portion, it is easier to manufacture the through hole instead of the concave portion.

By configuring in this way, the size of the rotating electric machine 1 in the axial direction is shortened, so that the rotating electric machine 1 can be miniaturized. In addition, since the rotary electric machine 1 is miniaturized without reducing the size of the coolant passage 31a in the axial direction, the cooling performance of the power module 9 by the coolant passage 31a can be ensured.

3, the cooler 37 is arranged with a gap 38 on the other side of the connecting board 18 in the axial direction. The rotary electric machine 1 is arranged, for example, in FIG. 5 so that the direction indicated by the arrow is the ground direction. By providing a gap 38 between the cooler 37 and the connecting board 18, even if the rotary electric machine 1 is wet, the water can be easily drained through the gap 38. Therefore, the drainage performance of the rotary electric machine 1 can be improved. Since the drainage performance of the rotating electric machine 1 is improved, water does not accumulate at the connecting portion between the stator 3 and the inverter section 40, so that electrolytic corrosion occurring at the connecting portion can be suppressed. Moreover, insulation between the inverter unit 40 and the bracket can be ensured.

Further, as shown in FIG. 6, a fin 39 may be provided on one side surface of the lower cover 32 in the axial direction. The fins 39 are provided on a portion of the lower lid 32 that does not face the connecting board 18 on one side in the axial direction of the lower lid 32 so that the rotating electric machine 1 does not increase in size in the axial direction. By providing the fins 39, the power module 9 can be cooled more efficiently. Further, the heat from the cooling air can be absorbed by the fins 39 and the temperature of the cooling air can be stabilized, so the motor section 30 can be efficiently cooled.

As described above, in the rotary electric machine 1 according to Embodiment 1, the motor section 30 provided with the rotating shaft 11, the rotor 2, the stator 3, and the bracket, the power module 9, the control module 17, and the cooler 37 are a connecting board 18 having a terminal 19 disposed between the provided inverter section 40 and the motor section 30 and the inverter section 40, and having a connection portion 19a connected to the stator winding 3a and a connection portion 19b connected to the power module 9; The cooler 37 has an upper lid 31 in which a coolant passage 31a is formed and a lower lid 32 that closes the opening of the coolant passage 31a. A lower lid first through hole 32a provided in the lower lid 32 facing the lower lid 31c and a first screw 34 screwed into the upper lid screw hole 31c through the lower lid first through hole 32a. 31, the connecting board 18 is provided with a board through hole 18b or a board recess in a portion facing the head of the first screw 34, and the head of the first screw 34 is inside the board through hole 18b or the board recess. Since it has the arranged portion, the size of the rotating electric machine 1 in the axial direction can be reduced. In addition, since the rotary electric machine 1 is miniaturized without reducing the size of the coolant passage 31a in the axial direction, the cooling performance of the power module 9 by the coolant passage 31a can be ensured.

When the projecting portion of the stator lead wire 3c and the connection portion 19a of the terminal pass through the lower lid second through hole 32b and have a portion disposed inside the hole portion 31b, the size of the rotary electric machine 1 in the axial direction is Since it is shortened, the rotary electric machine 1 can be miniaturized. Further, when the cooler 37 is arranged with a gap 38 on the other side of the connecting board 18 in the axial direction, even if the rotary electric machine 1 is exposed to water, the water can be easily drained from the gap 38. Since water does not accumulate at the connecting portion between the stator 3 and the inverter section 40, electrolytic corrosion occurring at the connecting portion can be suppressed.

Embodiment 2.
A rotating electrical machine 1 according to Embodiment 2 will be described. FIG. 7 is a cross-sectional view showing a main part of the rotary electric machine 1 according to Embodiment 2, showing the first screw 34 and surrounding parts. A rotary electric machine 1 according to the second embodiment has a board through-hole 18b configured differently from that of the first embodiment.

The head of the first screw 34 fits into the board through hole or board recess. In the present embodiment, the head of the first screw 34 is fitted inside the board through-hole 18b. The board through-hole 18b is sized so that the head of the first screw 34 can be fitted therein.

As described above, in the rotary electric machine 1 according to Embodiment 2, since the head of the first screw 34 is fitted into the board through hole 18b, the fit between the head of the first screw 34 and the board through hole 18b is The alignment can be used to position the inverter section 40 with respect to the motor section 30 . Since the fitting between the head of the first screw 34 and the board through hole 18b can be used for positioning the inverter section 40, the number of parts used for positioning the rotary electric machine 1 can be reduced. Since the number of parts of the rotating electrical machine 1 can be reduced, the productivity of the rotating electrical machine 1 can be improved.

Embodiment 3.
A rotating electric machine 1 according to Embodiment 3 will be described. 8 is a plan view showing the motor section 30 side of the inverter section 40 of the rotating electrical machine 1 according to Embodiment 3, FIG. 9 is a cross-sectional view showing the main part of the rotating electrical machine 1, and FIG. 11 is a plan view showing 32 and showing one side of the lower lid 32 in the axial direction, and FIG. 11 is a cross-sectional view of the main part of the lower lid 32 taken along the line AA in FIG. The rotary electric machine 1 according to Embodiment 3 has a configuration in which the lower lid 32 includes a lower lid concave portion 32c.

As shown in FIG. 9, a bracket screw hole 5b provided on the other side surface of the rear bracket 5 in the axial direction, a through hole 18c provided in a portion of the connecting board 18 facing the bracket screw hole 5b, and a through hole 18c. The connecting board 18 is fixed to the rear bracket 5 at the holding member 18a by means of a second screw 35 threaded into the bracket screw hole 5b through the hole 18c.

The bottom lid 32 has a bottom lid recess 32c recessed on the other side in the axial direction at a portion of the surface on one side in the axial direction of the bottom lid 32 that faces the head of the second screw 35 . The head of the second screw 35 has a portion located inside the lower lid recess 32c. In this embodiment, two second screws 35 are arranged in the region of the connecting board 18 facing the lower lid 32, so that the lower lid 32 has two lower lid recesses 32c as shown in FIG. . By configuring in this way, the size of the rotating electric machine 1 in the axial direction is shortened, so that the rotating electric machine 1 can be miniaturized.

In the present embodiment, the portion of the lower lid 32 closing the coolant passage 31a of the lower lid 32 is recessed on the other side in the axial direction to provide a lower lid concave portion 32c as shown in FIG. A portion of the lower lid concave portion 32c on the other side in the axial direction protrudes into the coolant passage 31a. When the lower lid concave portion 32c is provided by protruding inside the coolant passage 31a, the surface area inside the flow passage 36 is increased, so that the cooling performance of the power module 9 can be improved. The portion of the lower lid 32 where the lower lid recess 32c is provided is not limited to the portion blocking the coolant passage 31a, and may be any other portion as long as it faces the head of the second screw 35. do not have.

In the present embodiment, as shown in FIG. 8, the width of the portion of the coolant passage 31a where the lower lid recess 32c protrudes is equal to the width of the coolant before and after the portion of the coolant passage 31a where the lower lid recess 32c protrudes. It is wider than the width of the passage 31a. With this configuration, even if the portion on the other side in the axial direction of the lower lid concave portion 32c protrudes inside the coolant passage 31a, the cross-sectional area of the flow passage 36 is not reduced. does not interfere with the flow of the coolant inside the Since the flow of the coolant is not obstructed, the cooling performance of the power module 9 by the coolant passage 31a can be ensured.

As described above, in the rotating electrical machine 1 according to Embodiment 3, the lower lid 32 is recessed toward the other axial side in the portion of the surface on the one axial side of the lower lid 32 that faces the head of the second screw 35 . Since the lower lid recessed portion 32c is provided, and the head portion of the second screw 35 has a portion arranged inside the lower lid recessed portion 32c, the size of the rotating electric machine 1 in the axial direction is shortened. It can be made smaller.

A portion of the lower lid 32 blocking the coolant passage 31a of the lower lid 32 is recessed on the other side in the axial direction to provide a lower lid recess 32c, and a portion on the other axial side of the lower lid recess 32c is the coolant passage. When protruding inside 31a, the surface area inside flow path 36 increases, so the cooling performance of power module 9 can be improved. When the width of the portion of the coolant passage 31a where the lower lid recess 32c protrudes is wider than the width of the coolant passage 31a before and after the portion of the coolant passage 31a where the lower lid recess 32c protrudes, the width of the lower lid recess 32c Even if the portion on the other side in the axial direction protrudes into the interior of the coolant passage 31a, the cross-sectional area of the passage 36 is not reduced and the flow of the coolant inside the passage 36 is not hindered. Cooling performance of the power module 9 can be ensured.

Also, while this application has described various exemplary embodiments and examples, various features, aspects, and functions described in one or more of the embodiments may vary from particular embodiment to specific embodiment. The embodiments are applicable singly or in various combinations without being limited to the application.
Accordingly, numerous variations not illustrated are envisioned within the scope of the technology disclosed herein. For example, modification, addition or omission of at least one component, extraction of at least one component, and combination with components of other embodiments shall be included.

1 rotating electric machine 2 rotor 2a field winding 2b field core 3 stator 3a stator winding 3b stator core 3c stator lead wire 4 front bracket 5 rear bracket 5a bolt , 5b bracket screw hole, 6 magnetic pole position detection sensor, 6a sensor stator, 6b sensor rotor, 7 bearing, 8 bearing, 9 power module, 9a AC terminal, 9b ground terminal, 9c input terminal, 9d control terminal, 10 field module , 11 rotating shaft, 12 pulley, 13 slip ring, 14 case, 14a terminal, 14b terminal, 15 rear cover, 16 brush, 16a brush holder, 17 control module, 18 connecting board, 18a holding member, 18b board through-hole, 18c through-hole Hole 19 Terminal 19a Connection point 19b Connection point 19c Screw 20 Air cooling fan 21 Air cooling fan 22 Cooling gas passage 30 Motor part 31 Upper lid 31a Coolant passage 31b Hole 31c Upper lid screw hole 32 Lower lid 32a Lower lid first through hole 32b Lower lid second through hole 32c Lower lid recess 33 Nipple 34 First screw 35 Second screw 36 Channel 37 Cooler 38 Gap 39 fin, 40 inverter part

Claims (7)

A rotating shaft, a rotor having a field core wound with a field winding and rotating integrally with the rotating shaft, and a stator winding disposed radially outside the field core and wound with a stator winding and a bracket that covers the outside of the field core and the stator core and holds one end side and the other end side of the rotating shaft via bearings. Department and
a power module having a switching element for turning on and off a current supplied to the stator winding; a control module having a control circuit for controlling the switching element; and a cooler for cooling the power module, an inverter unit arranged on the other side of the bracket in the axial direction and fixed to the bracket;
a terminal having one end connected to the stator winding and the other end connected to the power module at least partially disposed between the motor section and the inverter section; and a holding member holding the terminal. a connecting board in which the holding member is fixed to the bracket;
The cooler includes an upper cover having a surface on the other axial side to which the power module is thermally connected, and a cooling liquid passage recessed toward the other axial side on the surface on the one axial side. a lower lid that closes the opening on one side of the coolant passage in the axial direction;
An upper lid screw hole provided in the outer peripheral portion of one side surface of the upper lid in the axial direction, a lower lid first through hole provided in the portion of the lower lid facing the upper lid screw hole, and the lower lid second The lower lid is fixed to the upper lid by a first screw that passes through a through hole and is screwed into the upper lid screw hole,
The connecting board is provided with a board through hole or a board recess in a portion facing the head of the first screw on the other side surface of the connecting board in the axial direction,
The rotary electric machine, wherein the head of the first screw has a portion arranged inside the board through-hole or the board recess. The rotary electric machine according to claim 1, wherein the head of the first screw is fitted into the board through-hole or the board recess. a bracket screw hole provided on the other side surface of the bracket in the axial direction; a through hole provided in a portion of the connecting board facing the bracket screw hole; The connecting board is fixed to the bracket by a second screw screwed into the
The lower lid is provided with a lower lid recess recessed toward the other axial side in a portion of the surface on the one axial side of the lower lid that faces the head portion of the second screw,
3. The electric rotating machine according to claim 1, wherein the head of said second screw has a portion arranged inside said lower lid concave portion. A portion of the lower lid blocking the coolant passage of the lower lid is recessed on the other side in the axial direction to provide the lower lid recess,
4. The electric rotating machine according to claim 3, wherein the other axial portion of the lower lid recess protrudes into the coolant passage. 5. The electric rotating machine according to claim 4, wherein the width of the portion of the coolant passage where the recessed lower lid protrudes is wider than the width of the coolant passage before and after the portion of the coolant passage where the recessed lower lid protrudes. . A stator lead wire, which is an end portion of the stator winding, passes through the connecting board from one side in the axial direction to the other side, and the stator lead wire protrudes from the connecting board to the other axial side. a portion connected to said one end of said terminal;
the lower lid is provided with a lower lid second through hole in a portion facing the protrusion of the stator lead wire and the one end of the terminal on one side surface of the lower lid in the axial direction;
the upper lid has a hole portion that communicates with the lower lid second through hole and is recessed on the other side in the axial direction;
6. The projecting portion of the stator lead wire and the one end of the terminal pass through the lower lid second through hole and have a portion disposed inside the hole portion. The rotary electric machine described in . The rotating electric machine according to any one of claims 1 to 6, wherein the cooler is arranged with a gap on the other side of the connecting board in the axial direction.

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