JP2005348494A - Dynamo-electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To sufficiently secure heat radiation of a power element in integrating a power element unit to a dynamo-electric machine or bringing them closer together, as well as to prevent equipment as a whole from getting larger. <P>SOLUTION: The dynamo-electric machine comprises a dynamo-electric machine part equipped with a rotor 15 having a field winding 14 and with a stator 16 having an armature winding 16a arranged surrounding the rotor 15, and a switching circuit part which is provided integrally or close to the dynamo-electric machine part, and which is equipped with a pair of switching elements 41 constituting at least an upper arm and a lower arm. Both drain terminals of the switching elements 41 of the upper arm and the lower arm in the switching circuit are connected to respective heat sinks 50, 51 not through an insulator. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a structure of a rotating electrical machine, for example, a rotating electrical machine for a vehicle, on which a power element unit that performs inverter control or the like is mounted.

  Conventionally, in general, a power element unit that performs inverter control or the like on a rotating electrical machine has been installed away from the rotating electrical machine. As a result, the length of the AC wiring that electrically connects the power element unit and the rotating electrical machine becomes longer, the wiring resistance increases, and the voltage drop increases, so the torque of the rotating electrical machine decreases and the rotational speed decreases. There was a problem that decreased. In particular, in a rotating electrical machine for a vehicle using a low voltage of 12V or 36V as a power source, the influence of the voltage drop is large. For example, if there is a voltage drop of 0.5V, the power supply voltage loss is about 4%. Further, although a measure of thickening the wiring in order to suppress the voltage drop can be considered, there is a problem that the weight of the wiring increases and the cost increases.

  Even if the rotating element is not a low-voltage power rotating machine, if the power element unit and the rotating electric machine are placed apart from each other, it is necessary to connect them with long wires, which not only restricts the layout of the product but also the wiring. The parts cost and installation cost increase.

  Therefore, for example, as in Patent Document 1, there is one in which an inverter unit can be integrally attached to a vehicular rotating electrical machine. In this case, by connecting the inverter unit integrally to the rear bracket, the harnesses to be connected can be shortened, and the voltage drop can be suppressed and the torque characteristics and the rotational speed characteristics of the rotating electrical machine can be improved. In addition, the weight of the harness can be reduced and the noise resistance can be improved.

JP 2003-225000 A (Claim 5, paragraph number [0039], FIG. 4 etc.)

  However, as shown in Patent Document 1 and the like, it is necessary to ensure the heat dissipation of the power element when arranging the inverter unit in the vicinity of the rotating electrical machine. Moreover, since the rotating electrical machine itself generates heat, the ambient temperature environment is severe, and by placing a control circuit including a power element that is a heating element near the rotating electrical machine, the temperature further rises and the power element and the control element are destroyed. There was a problem. Furthermore, since the power element unit is additionally installed in the space of the rotating electrical machine, there is a problem that the entire apparatus is increased in size.

  The present invention has been made to solve the above-described problems, and an object thereof is to ensure sufficient heat dissipation of a power element when a power element unit such as an inverter unit is brought close to a rotating electrical machine. .

  Moreover, even if a power element unit is added and installed in the space of the rotating electrical machine, the entire apparatus is not enlarged.

  A rotating electrical machine according to the present invention includes: a rotating electrical machine unit including a rotor that is rotatably disposed; and a stator that is disposed so as to surround the rotor and has an armature winding; A switching circuit unit that is provided integrally or in close proximity, and includes a switching circuit unit (power element unit unit) that includes at least a pair of switching elements that constitute an upper arm and a lower arm and performs switching control of the rotating electrical machine unit. The drain terminals of both the switching elements of the upper arm and the lower arm are connected to separate heat sinks without passing through an insulator.

  In particular, these separate heat sinks are connected to the first heat sink (inner heat sink) connected to the positive side potential of the battery and to the drain terminal of the switching element of the upper arm, and to each phase potential of the armature winding. And a second heat sink (outside heat sink) to which the drain terminal of the switching element of the lower arm is connected.

  In addition, a rotating electrical machine according to the present invention includes a rotating electrical machine unit including a rotor that is rotatably disposed, and a stator that is disposed so as to surround the rotor and has an armature winding, and the rotating electrical machine. A switching circuit portion (power element unit portion) that is provided integrally with or close to the portion and includes at least a pair of switching elements that constitute the upper arm and the lower arm, and performs switching control of the rotating electrical machine portion. The drain terminal of either the switching element of the upper arm or the lower arm of the circuit unit is connected to the heat sink without an insulator.

  In particular, this heat sink is a heat sink to which the drain terminal of the switching element of the upper arm is connected while being connected to the positive side potential of the battery.

  According to the rotating electrical machine according to the present invention, since an insulating layer between the switching element as a power element and the heat sink is not necessary, the thermal conductivity can be improved. As a result, the heat dissipation amount of the switching element is improved, and the cooling performance of the power element unit is improved.

  Since the heat sink can be used as the wiring, the number of wiring components can be reduced, and the wiring board itself can be reduced in size, so that the entire apparatus can be reduced in size.

  By reducing the size of the power element unit, the air path is secured and effective cooling is performed, so that the entire cooling performance can be secured. In addition, since it can be integrated with a control circuit and the like and the connected cable device can be omitted, the system can be made inexpensive and the failure probability can be reduced.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view showing the structure of a rotating electrical machine according to Embodiment 1 of the present invention, in which a power element unit is disposed integrally or in proximity to the rotating electrical machine.

  In FIG. 1, a rotating electrical machine 10 includes a case made up of a front bracket (not shown) and a rear bracket 11, a shaft 13 disposed rotatably in the case via a support bearing 12, and the shaft 13. A rotor 15 having a field winding 14 fixed thereto, a stator 16 fixed to the case and disposed so as to surround the rotor 15, and having an armature winding 16a, and the rotor 15 The fan 17 fixed to both end surfaces in the axial direction, the pulley 18 fixed to the front side end of the shaft 13, and the brush holder attached to the rear bracket 11 so as to be positioned on the rear side outer periphery of the shaft 13 19 and a pair of brushes 20 disposed in the brush holder 19 so as to be in sliding contact with a pair of slip rings 21 mounted on the rear side of the shaft 13. , And a rotation disposed on the rear side edge position detecting sensor (resolver) 22 of the shaft 13. The rotating electrical machine 10 is connected to an engine rotation shaft (not shown) via a pulley 18 and a belt (not shown).

  In the present embodiment, the power element unit 4 is installed integrally or close to the rotating electrical machine 10. That is, inside the cover 30 disposed on the rear side of the rear bracket 11, a plurality of power elements (switching elements described later) 41 constituting the power element unit 4, an inner heat sink 50 connected to each power element 41, and An outer heat sink 51 is installed. The layout of the power element 41, the inner heat sink 50, and the outer heat sink 51 will be described in detail with reference to FIGS. Further, inside the cover 30, a control circuit board 44 a on which a control circuit 44 to be described later is mounted and the wiring of the armature winding 16 a are connected to the outer heat sink 51 and the terminal of the power element unit 4 is connected to the ground. A connection plate 55 is provided. Further, the cover 30 and the rear bracket 11 are provided with ventilation holes 30a, 11a. By the rotation of the fan 17 of the rotor 15, the wind as shown by the arrow F passes through the inside of the cover 30, and the power element 41, the inner heat sink 50 The outer heat sink 51, the control circuit 44, and the connection board 55 are cooled.

  FIG. 2 is a schematic circuit diagram for explaining the operation of the rotating electrical machine including the power element unit. In FIG. 2, the rotating electrical machine 10 includes an armature winding 16a of a stator 16 and a field winding 14 of a rotor 15, and a pulley 18 connected to the rotor 15 rotates an engine (not shown). It is connected by a shaft and a belt. Here, the armature winding 16a is configured by Y-connection (star connection) of three-phase (U-phase, V-phase, W-phase) coils. The power element unit 4 includes a switching element (power transistor, MOSFET, IGBT, etc.) 41, which is a plurality of power elements, and an inverter module 40 including a diode 42 connected in parallel to each switching element 41, and in parallel with the inverter module 40. And a capacitor 43 connected to the. The inverter module 40 includes two sets of switching elements 41 and diodes 42 constituting the upper arm 46 and two switching elements 41 and diodes 42 constituting the lower arm 47 connected in series. They are arranged in parallel.

  The ends of each phase of the Y connection of the armature winding 16a are electrically connected to the intermediate points of the switching element 41 of the upper arm 46 and the switching element 41 of the lower arm 47 arranged in series via the AC wiring 9, respectively. It is connected. Further, the positive electrode side terminal and the negative electrode side terminal of the battery 5 are electrically connected to the positive electrode side and the negative electrode side of the inverter module 40 via the series wiring 8, respectively.

  In the inverter module 40, the switching operation of each switching element 41 is controlled by a command from the control circuit 44. Further, the control circuit 44 controls the field current control circuit 45 to adjust the field current that flows through the field winding 14 of the rotor.

  In the rotating electrical machine 10 including the power element unit 4 as described above, DC power is supplied from the battery 5 to the power element unit 4 via the DC wiring 8 when the engine is started. Then, the control circuit 44 performs ON / OFF control of each switching element 41 of the inverter module 40, and DC power is converted into three-phase AC power. The three-phase AC power is supplied to the armature winding 16a of the rotating electrical machine 10 through the AC wiring 9. Thereby, a rotating magnetic field is applied around the field winding 14 of the rotor to which the field current is supplied by the field current control circuit 45, and the rotor 15 is driven to rotate. The engine is started via the crank pulley and the clutch (ON).

  On the other hand, when the engine is started, the rotational power of the engine is transmitted to the rotating electrical machine 10 through the crank pulley, the belt, and the rotating electrical machine pulley. Thereby, the rotor 15 is rotationally driven and a three-phase AC voltage is induced in the armature winding 16a. Therefore, the control circuit 44 performs ON / OFF control of each switching element 41, converts the three-phase AC power induced in the armature winding 16a into DC power, and charges the battery 5.

  FIG. 3 is a plan view of the rotating electrical machine of FIG. 1 as viewed from the line AA, and shows a layout of the power element unit 4. Note that the brush holder 19 and the rotational position detection sensor 22 shown in FIG. 1 are omitted.

  In the figure, a power element (switching element) 41 constituting the power element unit 4 (inverter module 40) is a three-phase part of U, V, and W (U-phase part 60, V-phase part 70, W-phase part 80). It is divided and arranged. In each part, an inner heat sink 50 and an outer heat sink 51 which are a pair of heat sinks are mounted. Each of the heat sinks 50 and 51 is connected with four switching elements 41 which are discrete type power elements in parallel.

  For example, the U-phase portion 60 will be described. To the inner heat sink 50, four switching elements 41 (outlined in the drawing) of the upper arm 46 corresponding to the U-phase are connected. Further, four switching elements 41 (indicated by oblique lines) of the lower arm 47 corresponding to the U phase are connected to the outer heat sink 51. The four switching elements 40 are connected in parallel in circuit. Thus, by connecting a plurality of switching elements 41 in parallel, the current-carrying capacity per one switching element can be reduced, and it can be configured at low cost. Moreover, since one switching element 41 can be reduced in size, the degree of freedom of arrangement is improved, such as arranging it in a horizontal row or arranging it in a square shape, which is convenient for layout in a compact space.

  FIG. 4 shows an enlarged connection portion between the switching element 41 that is a power element and the heat sinks 50 and 51. In the figure, the inner heat sink 50 has a positive potential and is connected to the positive terminal of the battery 5 shown in FIG. The four power elements 41 arranged on the inner heat sink 50 correspond to the switching elements 41 of the upper arm 46 shown in FIG. 2, and the base plate serving as the drain terminal D is directly connected to the heat sink 50 by soldering or the like. . The source terminal S of the switching element 41 is connected to the wiring board 90, and the wiring board 90 is connected to the outer heat sink 51. The outer heat sink 51 is connected to the lead wire R of the U-phase armature winding via the wiring board 90 and has a U-phase potential. The four power elements 41 arranged on the outer heat sink 51 correspond to the switching element 41 of the lower arm 47 shown in FIG. 2, and the base plate serving as the drain terminal D is directly connected to the heat sink 51 by soldering or the like. . Further, the source terminal S of the switching element 41 is connected to the connection board 55 shown in FIG.

  The layout of the power element units of the V-phase part 70 and the W-phase part 80 is also configured in the same manner as the U-phase part 60. Since the inner heat sinks 50 of the three parts (the U phase, the V phase, and the W phase part) are at the same potential (the positive side potential of the battery 5), without providing a terminal connected to the battery 5 on each inner heat sink 50, By electrically connecting the inner heat sinks 50, the number of battery connection terminals can be reduced. A wiring board (a wiring board corresponding to the wiring board 91 in FIG. 4) connected to the source terminal of the power element (switching element) 41 disposed on the outer heat sink 51 of the U-phase part 60, the V-phase part 70, and the W-phase part 80. Are connected to the ground as the same potential. Alternatively, the wiring board can be reduced in size by connecting each wiring board to a nearby ground portion (for example, a bracket).

  The outer heat sinks 51 of the U-phase part 60, the V-phase part 70, and the W-phase part 80 are respectively connected to the U-phase, V-phase, and W-phase lead wires of the stator armature winding 16a. Insulated.

  FIG. 5 is a diagram showing a mounting example of a power element in a power element unit, which is different from the present embodiment. The switching element 41a constituting the upper arm 46 and the switching element 41b constituting the lower arm 47 are connected to the metal substrate 103 via the solder 101 and the heat spreader 102, and further to the heat sink 106 via the insulating resin 104 and the heat radiation grease 105. It is connected. The metal substrates 103 of the two switching elements 41a and 41b also serve as drain terminals, and are insulated by the insulating resin 104 because they have different potentials. The heat of the switching elements 41a and 41b, which are power elements, is transferred to the heat sink 106 through the insulating resin 104 and is radiated into the air. The electric heating path of the power element is chips 41a and 41b which are heating elements, a heat spreader 102 which is a connection body to the outside, and a solder 101 which connects them, and each has a thermal conductivity of 0.0254 W / m · K, 0. 0293 W / m · K and 0.0165 W / m · K. On the other hand, the thermal conductivity of the insulating resin 104 is 0.07 to 0.09 W / m · K, and the heat dissipation is greatly impaired by the presence of the insulator in the heat transfer path.

  In the present embodiment, as described with reference to FIG. 5, the power elements (switching elements) 41 of the upper arm 46 and the lower arm 47 are arranged side by side on the substrate and insulated from each other after insulating them from each other. Instead of mounting a heat sink made of a conductive material, separate heat sinks (inner heat sink 50, outer heat sink 60) are directly connected to the power elements (switching elements) 41 of the upper arm 46 and the lower arm 47, respectively. The separate heat sinks (the inner heat sink 50 and the outer heat sink 60) are insulated from each other, and an insulator may not be interposed between the power element (switching element) 41 and the heat sinks 50 and 60. That is, since the base part (drain) of the power element (switching element) 41 and the heat sinks 50 and 51 have the same potential, they can be directly connected by soldering or the like without using an insulator. As described above, since it is not necessary to use an insulator having a large thermal resistance, the thermal resistance can be reduced and the heat dissipation can be improved.

  In FIG. 5, wiring is required for the electrical connection between the power elements (switching elements) 41 of the upper arm 46 and the lower arm 47, but according to the present embodiment, the heat sinks 50 and 51 are provided. Also serves as wiring. For example, the U-phase upper arm 46 has four switching elements 41 mounted thereon, but instead of using wiring such as copper wires to connect these four drain terminals in parallel, the four switching elements 41 are connected to the heat sink. By connecting directly to each other, parallel electrical connection is established. The parallel connection of the drain terminal of the power element (switching element) 41 of the lower arm 47 is the same. The same applies to V-phase and W-phase power elements (switching elements). That is, since the heat sinks 50 and 51 also serve as wiring, wiring such as copper wires can be reduced, and the size of the power element unit itself can be reduced.

  Fans 17 are mounted on both end surfaces of the rotor 15 in the axial direction, and cooling air is sucked into the cover 30 from the ventilation holes 30a provided in the cover 30 by the rotation of the rotor 15, and the power element. The power element 41, the inner heat sink 50, the outer heat sink 51, the control circuit 44, and the connection plate 55 constituting the unit 4 are cooled. Furthermore, the cooling performance of the entire apparatus can be improved by passing cooling air in the axial direction from the ventilation hole 11a of the rear bracket 11 to the main body of the rotating electrical machine 10.

  Further, the inner heat sink 50 and the outer heat sink 51 are provided with heat radiation fins, respectively. Furthermore, the surface of the heat sink 50, 51 on the side where the area of the radiation fin is wide is arranged so as to face the axial direction of the rotor 15. With such a heat sink fin structure, the heat dissipation surface of the fin is oriented along the flow of the wind, so that it is difficult to increase the pressure loss and it is convenient to secure the air volume for cooling. Further, since the power elements 41 mounted on the heat sinks 50 and 51 are arranged in parallel in the radial direction of the rotor 15, the surface to which the power elements 41 are connected is efficiently cooled.

  Further, the control circuit 44 having low heat resistance is arranged on the outer peripheral side upstream in the axial direction from the power element unit 4. Since the flow of the wind generated by the fan 17 of the rotor 15 is sucked from the outer peripheral side, the control circuit 44 can be cooled with a cooler fluid by arranging the control circuit 44 upstream of the cooling air. The cooling performance of the control circuit 44 can be improved.

  Further, as shown in FIG. 3, the power elements 41, the inner heat sink 50, and the outer heat sink 51 constituting the U-phase portion 60, the V-phase portion 70, and the W-phase portion 80 have an angle of approximately 90 degrees. It is arranged and forms a U-shape as a whole. A brush unit 19 for supplying power to the field winding 14 of the rotor 15 is provided on one side that is not the U-phase part 60, the V-phase part 70, and the W-phase part 80 (where the power element unit 4 is not disposed). Has been placed. Thus, the axial length as the whole apparatus can be shortened by arranging the power element unit 4 and the brush unit 19 in the same plane with the phases being shared.

  In the above description, the rotary electric machine 10 in which the field winding 14 and the brush holder 19 are disposed on the rotor 15 has been described. However, the rotary electric machine 10 that does not include the field winding 14 and the brush holder 19 may be applied. Is also possible. Further, a substrate on which the control circuit 44 is mounted instead of the brush holder 19 may be disposed on one side where the U-phase region 60, the V-phase region 70, and the W-phase region 80 are not disposed.

  In the above, the inner heat sink 50 is shown to be composed of three parts of the U-phase part 60, the V-phase part 70 and the W-phase part 80. By mounting the power element (switching element) 41 of each upper arm 46 of the W phase on the same heat sink, the wiring assembly can be further rationalized.

  Further, when the rotating electrical machine according to the present embodiment is applied to a rotating electrical machine having a power supply voltage of less than 100 V or an in-vehicle motor generator, the effects are particularly exhibited in terms of improving heat dissipation and reducing the size of the apparatus.

Embodiment 2. FIG.
In the first embodiment, the example in which the drain terminals of the switching elements of the upper arm and the lower arm are connected to different heat sinks without using an insulator has been described. An example in which the drain terminal of either the switching element of the arm or the lower arm is connected to the heat sink without an insulator will be described.

  6 is a plan view showing an arrangement example of power element units of a rotary electric machine according to Embodiment 2 of the present invention, and is a plan view seen from the line AA of FIG. Note that the brush holder 19 and the rotational position detection sensor 22 shown in FIG. 1 are omitted.

  In the figure, power elements (switching elements) 41a and 41b that constitute the power element unit 4 (inverter module 40) are U, V, and W three-phase parts (U-phase part 60, V-phase part 70, and W-phase part). 80). One heat sink 52 is installed in each part. Each heat sink 52 is connected with two switching elements 41a and 41b, which are discrete type power elements, in parallel.

  For example, the U-phase portion 60 will be described. To the heat sink 52, two switching elements 41a (shown in white) of the upper arm 46 corresponding to the U-phase are connected. The heat sink 52 is connected with two switching elements 41b (indicated by oblique lines) of the lower arm 47 corresponding to the U phase. The switching elements 41a and 41b are connected in parallel in circuit.

  FIG. 7 is a diagram showing an example of mounting a power element unit of a rotating electrical machine according to Embodiment 2 of the present invention. The base plate (drain terminal) of the switching element 41 a constituting the upper arm 46 is directly connected to the heat sink 52 via the solder 101 and the heat spreader 102. The heat sink 52 is connected to the positive side potential of the battery 5. The switching element 41 b constituting the lower arm 47 is connected to the metal substrate 103 via the solder 101 and the heat spreader 102, and further connected to the heat sink 52 via the insulating resin 104 and the heat radiation grease 105.

  As described above, according to the present embodiment, a part of the insulating layer between the switching element, which is a power element, and the heat sink becomes unnecessary, so that the thermal conductivity can be improved. As a result, the heat dissipation amount of the switching element is improved, and the cooling performance of the power element unit is improved.

  Further, since the heat sink can be used as the wiring, the number of wiring parts can be reduced, and the wiring board itself can be reduced in size, so that the entire apparatus can be reduced in size.

  Moreover, since the air passage is secured and effective cooling is performed by downsizing the power element unit portion, the entire cooling performance can be secured. In addition, since it can be integrated with a control circuit and the like and the connected cable device can be omitted, the system can be made inexpensive and the failure probability can be reduced.

It is sectional drawing which shows the structure of the rotary electric machine by Embodiment 1 of this invention. It is a schematic circuit diagram for demonstrating operation | movement of the rotary electric machine by Embodiment 1 of this invention. It is a top view which shows the example of arrangement | positioning of the power element unit of the rotary electric machine by Embodiment 1 of this invention. It is an enlarged view which shows the connection part of the switching element which is a power element by Embodiment 1 of this invention, and a heat sink. It is a figure which shows the example of mounting of the power element in the power element unit of a rotary electric machine. It is a top view which shows the example of arrangement | positioning of the power element unit of the rotary electric machine by Embodiment 2 of this invention. It is a figure which shows the example of mounting of the power element unit of the rotary electric machine by Embodiment 2 of this invention.

Explanation of symbols

4 power circuit units, 10 rotating electrical machines, 14 field windings, 15 rotors,
16 Stator, 16a Armature winding, 17 Fan,
41 switching element (power element), 44 control circuit, 46 upper arm,
47 lower arm, 50 inner heat sink, 51 outer heat sink,
52 heat sink, 60 U phase site, 70 V phase site, 80 W phase site.

Claims (17)

A rotating electrical machine unit including a rotor disposed rotatably and a stator having an armature winding disposed so as to surround the rotor;
A switching circuit unit that is provided integrally or in proximity to the rotating electrical machine unit and includes a pair of switching elements that constitute at least an upper arm and a lower arm, and performs switching control of the rotating electrical machine unit,
A rotating electric machine characterized in that drain terminals of both switching elements of the switching circuit section are connected to different heat sinks without an insulator. The separate heat sink has a positive side potential of the battery and a first heat sink to which a drain terminal of the switching element of the upper arm is connected, and each phase potential of the armature winding and the switching of the lower arm The rotating electric machine according to claim 1, wherein the rotating electric machine is a second heat sink to which a drain terminal of the element is connected. A rotating electrical machine unit including a rotor disposed rotatably and a stator having an armature winding disposed so as to surround the rotor;
A switching circuit unit that is provided integrally or in proximity to the rotating electrical machine unit and includes a pair of switching elements that constitute at least an upper arm and a lower arm, and performs switching control of the rotating electrical machine unit,
A rotating electrical machine, wherein a drain terminal of either the switching element of the upper or lower arm of the switching circuit portion is connected to a heat sink without an insulator. The rotating electrical machine according to claim 3, wherein the heat sink is a heat sink having a positive electrode side potential of a battery and connected to a drain terminal of the switching element of the upper arm. The rotating electrical machine according to any one of claims 1 to 4, wherein the switching element connected to the heat sink is configured by connecting a plurality of switching elements in parallel. 6. The drain terminal of the switching element of the upper arm installed corresponding to the armature winding of a plurality of phases is connected to the same heat sink. 6. The rotating electrical machine described in 1. The bracket of the rotating electrical machine is set to the same potential as the ground of the battery, and the source terminal of the switching element of the lower arm is connected to a nearby bracket. Rotating electric machine. The rotating electrical machine according to any one of claims 1 to 7, wherein the switching element of the upper arm and the switching element of the lower arm are discrete types and are separate bodies. The rotating electrical machine according to any one of claims 1 to 8, wherein a fan is mounted on an end surface of the rotor, and the switching circuit unit and the heat sink are cooled by the rotation of the fan. The rotating electrical machine according to any one of claims 1 to 9, wherein a radiation fin is mounted on the heat sink. The rotating electrical machine according to claim 10, wherein the surface of the heat sink connected to the switching element and the direction of the radiation fin are arranged in a direction along a flow of cooling air. The rotation according to claim 9, further comprising a control circuit that controls the switching circuit, wherein the position of the control circuit is arranged upstream of the cooling air on the outer peripheral side in the axial direction with respect to the switching circuit. Electric. A first heat sink to which the drain terminal of the switching element of the upper arm is connected and a second heat sink to which the drain terminal of the switching element of the lower arm is connected have an inner circumference centering on the rotating shaft of the rotating electrical machine. The rotating electrical machine according to claim 2, wherein the rotating electrical machine is disposed to face the outer side and the outer peripheral side. A pair of heat sinks arranged on the inner circumference side and the outer circumference side are arranged in a substantially U shape for each phase, and a control circuit for controlling the switching circuit is arranged in a space where the heat sink is vacant. The rotating electrical machine according to claim 13. The rotor has a field winding, and a pair of heat sinks arranged on the inner peripheral side and the outer peripheral side are arranged in a substantially U shape for each phase, and the heat sink has a space in the space The rotating electrical machine according to claim 13, wherein a brush unit connected to the field winding is disposed. The rotating electrical machine according to any one of claims 1 to 14, wherein the power supply voltage is less than 100V. The rotating electrical machine according to any one of claims 1 to 15, wherein the rotating electrical machine is an in-vehicle motor generator.

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