Drive device for vehicle

Abstract

To efficiently cool a power supply device for supplying electric power to a stator coil and a power supply device for supplying electric power to a field coil.SOLUTION: A drive device for a vehicle includes a rotating electric machine having a stator around which a coil wire for a stator coil is wound, and a rotor around which a coil wire for a field coil is wound, a first power supply device that is electrically connected between a power source and the coil wire for the stator coil and supplies electric power to the stator coil, a second power supply device that is electrically connected between the power source and the coil wire for the field coil and supplies electric power to the field coil, and a cooling device that circulates a refrigerant through a refrigerant flow path. The second power supply device includes a rotation side device that rotates together with the rotor, and a non-rotation side device that is arranged to be opposite to the rotation side device, and the refrigerant flow path includes a first refrigerant flow path for cooling the first power supply device and a second refrigerant flow path for cooling at least one of the rotation side device and the non-rotation side device.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a drive device for a vehicle.

Background Art

[0002] In a configuration in which power is supplied to a field coil provided on a rotor in a non-contact manner, a technique of forming a refrigerant flow path in a rotor head cover including a part of a non-contact power supply device is known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the above prior art has a configuration in which refrigerant is supplied to the refrigerant flow path of the rotor head cover through the axial flow path of the rotor of the rotating electric machine, and the power supply device for supplying power to the stator coil cannot be cooled by the same refrigerant.

[0005] Therefore, on one side, an object of the present disclosure is to efficiently cool a power supply device for supplying power to a stator coil and a power supply device for supplying power to a field coil.

Means for Solving the Problems

[0006] On one side, a rotating electric machine having a stator around which a coil wire for a stator coil is wound and a rotor around which a coil wire for a field coil is wound, a first power supply device electrically connected between a power source and the coil wire for the stator coil and supplying power to the stator coil, a second power supply device electrically connected between the power source and the coil wire for the field coil and supplying power to the field coil, A cooling device that circulates a refrigerant through a refrigerant flow path, and the like are provided. The second power supply device includes a rotating-side device that rotates together with the rotor and a non-rotating-side device that is disposed opposite to the rotating-side device. The refrigerant flow path includes a first refrigerant flow path that cools the first power supply device and a second refrigerant flow path that cools at least one of the rotating-side device and the non-rotating-side device, and a vehicle drive device is provided.

Advantages of the Invention

[0007] On one aspect, according to the present disclosure, it becomes possible to efficiently cool a power supply device that supplies power to a stator coil and a power supply device that supplies power to a field coil.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0009] Hereinafter, each embodiment will be described in detail with reference to the accompanying drawings. Note that the dimensional ratios in the drawings are merely examples and are not limited thereto, and the shapes and the like in the drawings may be exaggerated partially for the convenience of explanation. Also, in the drawings, for the sake of clarity, only some of the parts having the same attribute may be labeled with reference numerals.

[0010] FIG. 1 is a configuration diagram showing a vehicle drive system 1 including a drive device 5 for a rotating electrical machine according to the present embodiment. FIG. 2 is a schematic cross-sectional view showing a part of the cross-section of the rotating electrical machine 3.

[0011] The vehicle drive system 1 has a two-power-source configuration including a low-voltage battery 2A and a high-voltage battery 2B, and includes a vehicle drive device 1A. The vehicle drive device 1A includes a rotating electrical machine 3 and a drive device 5.

[0012] The low-voltage battery 2A is, for example, a lead battery, and has a rated voltage of, for example, 12V.

[0013] The high-voltage battery 2B is, for example, a lithium-ion battery, and has a significantly higher rated voltage than the low-voltage battery 2A, for example, a rated voltage of 40V or more. In the present embodiment, as an example, the rated voltage of the high-voltage battery 2B is assumed to be 300V or more. Note that the high-voltage battery 2B may be in the form of a fuel cell or the like.

[0014] The rotating electrical machine 3 is of a wound-field type, and the rotor 310 includes a rotor core 312 and a rotor coil 316. The rotor coil 316 is formed by winding coil wires for the field coil around the rotor core 312. As shown in FIG. 2, the rotor core 312 has tooth portions 3122 protruding outward in the radial direction, and the coil wires for the field coil forming the rotor coil 316 are wound around the tooth portions 3122. A stator 320 is provided outside the rotor 310 in the radial direction. The coil wires forming the stator coil 322 are wound around the tooth portions 3210 of the stator core 321 as shown in FIG. 2.

[0015] The drive device 5 includes a microcomputer 50 (hereinafter referred to as "microcontroller 50") and an electric circuit unit 60.

[0016] The microcomputer 50 may be realized as an ECU (Electronic Control Unit), for example. The microcomputer 50 is connected to various electronic components (other ECUs and sensors) in the vehicle via a network 6 such as a CAN (Controller Area Network).

[0017] The microcomputer 50 receives various commands such as control commands from an upper ECU (not shown) via the network 6. The microcomputer 50 controls the rotating electrical machine 3 via the electric circuit unit 60 based on the control command. The microcomputer 50 operates based on the power from the low-voltage battery 2A.

[0018] The electric circuit unit 60 includes a smoothing capacitor 62, a power conversion circuit unit 63, a power supply circuit unit 64, and a power reception circuit unit 65. The power supply circuit unit 64 and the power reception circuit unit 65, together with the transformer Tr, form a power supply device 90 that supplies power to the rotor coil 316 in a non-contact manner. As a result, unlike a configuration that supplies power in a contact manner, there is no wear, and reliability (durability, etc.) can be improved. The transformer Tr has a primary coil 741 and a secondary coil 742. The primary coil 741 and the secondary coil 742 may be wound around a core (not shown) of any shape.

[0019] The smoothing capacitor 62 is provided between the high-potential line 20 and the low-potential line 22 of the high-voltage battery 2B. A resistor R0 for passive discharge may be connected to both ends of the smoothing capacitor 62.

[0020] The power conversion circuit unit 63 is in the form of an inverter and forms, for example, a three-phase bridge circuit. The power conversion circuit unit 63 supplies three-phase AC power to the stator 320 of the rotating electrical machine 3 under the control of the microcomputer 50 described later. The power conversion circuit unit 63 is connected between the high-potential line 20 and the low-potential line 22 in a manner parallel to the smoothing capacitor 62. The power conversion circuit unit 63 includes switching elements SW3 of each arm on the high-potential side and switching elements SW4 of each arm on the low-potential side.

[0021] The power supply circuit section 64 includes a bridge circuit section 641 and a drive circuit section 642.

[0022] The bridge circuit section 641 is connected in parallel with the smoothing capacitor 62 and the resistor R0 for passive discharge between the high potential side line 20 and the low potential side line 22. The bridge circuit section 641 is in the form of a full bridge circuit and includes switching elements SW1-1, SW1-2 and switching elements SW2-1, SW2-2.

[0023] The switching elements SW1-1 and SW1-2 are connected in series between the high potential side line 20 and the low potential side line 22. One end of the rotor coil 316 is connected between the switching elements SW1-1 and SW1-2. Also, the switching elements SW2-1 and SW2-2 are connected in series between the high potential side line 20 and the low potential side line 22 in a manner parallel to the switching elements SW1-1 and SW1-2. The other end of the rotor coil 316 is connected between the switching elements SW2-1 and SW2-2. Hereinafter, among the switching elements SW1-1, SW1-2, SW2-1, and SW2-2, the configurations related to the switching elements SW1-1 and SW2-1 may be labeled "high potential side" for distinction, and the configurations related to the switching elements SW1-2 and SW2-2 may be labeled "low potential side".

[0024] The switching elements SW1-1, SW1-2, SW2-1, and SW2-2 are switched between on / off states via the drive circuit section 642. The switching elements SW1-1, SW1-2, SW2-1, and SW2-2 change the energization state of the rotor coil 316 under the control of the drive circuit section 642. The switching elements SW1-1, SW1-2, SW2-1, and SW2-2 are, for example, IGBTs (Insulated Gate Bipolar Transistors), but may also be in other forms such as MOSFETs (Metal Oxide Semiconductor Field-Effect Transistors).

[0025] Based on the control signal from the microcomputer 50, the drive circuit unit 642 drives the gates of the switching elements SW1-1, SW1-2, SW2-1, and SW2-2 to supply power to the rotor coil 316 via the power receiving circuit unit 65.

[0026] The power receiving circuit unit 65 includes a rectifying circuit 652.

[0027] The rectifying circuit 652 is electrically connected between the transformer Tr and the rotor coil 316. The rectifying circuit 652 rectifies the current (drive current) on the secondary side of the transformer Tr and supplies it to the rotor coil 316. The rectifying circuit 652 may be a diode bridge circuit as shown in FIG. 1.

[0028] Next, with reference mainly to FIGS. 3 and later, the cooling device 80 of the vehicle drive device 1A of the present embodiment will be described.

[0029] In the following description, the axial direction refers to the direction in which the central axis I of the rotor 310 extends, and the radial direction refers to the radial direction centered on the central axis I. Therefore, the outer side in the radial direction refers to the side farther from the central axis I than that position, and the inner side in the radial direction refers to the side closer to the central axis I than that position. Also, the outer side in the axial direction refers to the side farther from the axial center of the rotor 310 than that position, and the inner side in the axial direction refers to the side closer to the axial center of the rotor 310 than that position. Also, the circumferential direction corresponds to the rotational direction around the central axis I.

[0030] Also, in the following description, when the refrigerant flow path 800 (or its element) is thermally connected to a specific element, it means that the refrigerant flowing in the refrigerant flow path 800 (or its element) can cool the specific element, and the two are connected.

[0031] FIG. 3 is an explanatory view of the cooling device 80 of the vehicle drive device 1A and is a schematic cross-sectional view of the vehicle drive device 1A. In FIG. 3, for the sake of explanation, the X direction and the X1 side and the X2 side on both sides thereof are defined. The X direction is parallel to the axial direction. Further, in FIG. 3, as a part of the wiring portion shown in FIG. 1, the wiring portion 6528 between the secondary side coil 742 of the transformer Tr and the rectifier circuit 652 and the wiring portion 3160 between the rectifier circuit 652 and the rotor coil 316 are schematically shown.

[0032] The case 200 is formed of, for example, aluminum. The case 200 may be formed by a combination of a plurality of case members. For example, in the example shown in FIG. 3, the case 200 is formed of four case members 201 to 204. However, the configuration of the case 200 is arbitrary. For example, the case member 202 and the case member 204 may be integrally formed as one piece, or the partition wall between the case member 201 and the case member 203 may be formed by only one of the case member 201 and the case member 203.

[0033] The case 200 forms a first accommodation chamber S1, a second accommodation chamber S2, and a third accommodation chamber S3.

[0034] The rotating electric machine 3 is accommodated in the first accommodation chamber S1. In the example shown in FIG. 3, the first accommodation chamber S1 is formed by the case members 201 and 202.

[0035] The second accommodation chamber S2 is arranged radially outside the first accommodation chamber S1. For example, the second accommodation chamber S2 is provided above the first accommodation chamber S1 in the case 200. In the example shown in FIG. 3, the second accommodation chamber S2 is formed by the case member 203. A part of the drive device 5 is arranged in the second accommodation chamber S2. In the present embodiment, the second accommodation chamber S2 houses an inverter module 70 forming the power conversion circuit section 63 and a converter module 72 forming the power supply circuit section 64. Note that the inverter module 70 may include a part or all of the microcomputer 50 (see FIG. 1) and / or a part or all of the drive circuit section 52 (see FIG. 1). Also, the converter module 72 may include a part or all of the microcomputer 50 (see FIG. 1) and / or a part or all of the drive circuit section 642 (see FIG. 1).

[0036] In addition, a water channel forming member 89 forming a part of a cooling device 80 described later is provided in the second accommodation chamber S2. The water channel forming member 89 may be arranged in the second accommodation chamber S2 in a manner thermally connected to the inverter module 70 and the converter module 72. In the example shown in FIG. 3, the inverter module 70 and the converter module 72 are arranged on both sides of the water channel forming member 89, but they may be arranged on the same side.

[0037] Note that in the present embodiment, the rotating electric machine 3 is cooled by oil. Therefore, the first accommodation chamber S1 and the second accommodation chamber S2 are blocked so as not to be fluidly communicated. However, in a modified example, the first accommodation chamber S1 and the second accommodation chamber S2 may be communicated. Also, a part of the rotating electric machine 3 (for example, the stator 320) may be cooled by a flow path (such as the flow path 8048 described later) formed in the case 200.

[0038] The third accommodation chamber S3 is arranged on one axial side with respect to the first accommodation chamber S1. In the example shown in FIG. 3, the third accommodation chamber S3 is formed by the case members 202 and 204. In the third accommodation chamber S3, the remaining part of the drive device 5 (components other than the part arranged in the second accommodation chamber S2) is arranged. In this embodiment, a transformer Tr and a rectifier circuit 652 are accommodated in the third accommodation chamber S3. In the example shown in FIG. 3, the primary coil 741 of the transformer Tr is arranged in the case 200 in a manner of being radially opposed to the shaft member 314 that rotates integrally with the rotor 310. In the example shown in FIG. 3, the primary coil 741 is provided on the case member 202, but it may be provided on the case member 204. Also, in the example shown in FIG. 3, the shaft member 314 extends to the radially inner side of the rotor core 312 and is fixed to the rotor core 312, but it is not limited to this. That is, the shaft member 314 is a one-piece shaft member integral with the rotor shaft, but it may be a separate member (a member coaxially fixed to the rotor shaft) that rotates integrally with the rotor shaft.

[0039] The cooling device 80 circulates the refrigerant through the refrigerant flow path 800 (see arrows R30 to R33). In this embodiment, the refrigerant is cooling water (for example, LLC: Long Life Coolant). As shown in FIG. 3, the cooling device 80 includes a radiator 81, a water pump 82, and the refrigerant flow path 800. In this case, the cooling water discharged from the water pump 82 is circulated through the radiator 81 in the refrigerant flow path 800. Hereinafter, the side closer to the radiator 81 in the flow direction of the cooling water is defined as the upstream side.

[0040] The radiator 81 and the water pump 82 may be arranged outside the case 200. In the example shown in FIG. 3, the water pump 82 is attached to the case 200 in a manner of being located on the downstream side of the outlet portion 8042. In a modified example, the water pump 82 may be arranged at the inlet portion 8041 of the case 200, and the radiator 81 may be arranged between the outlet portion 8042 and the water pump 82.

[0041] The refrigerant flow path 800 includes a flow path portion 801 from the discharge side of the water pump 82 to the radiator 81, a flow path portion 802 from the radiator 81 into the case 200, and an in-case flow path 804.

[0042] The in-case flow path 804 refers to the flow path portion from the inlet portion 8041 provided in the case 200 to the outlet portion 8042.

[0043] The in-case flow path 804 includes an upstream-side cooling flow path 8044, a downstream-side cooling flow path 8046, and a return flow path 8048.

[0044] The upstream-side cooling flow path 8044 is thermally connected to the drive device 5 disposed in the second accommodation chamber S2. In this embodiment, the upstream-side cooling flow path 8044 is thermally connected to the inverter module 70 and the converter module 72, which are part of the drive device 5. The upstream-side cooling flow path 8044 includes a water path 892 formed by the above-described water path forming member 89. In the example shown in FIG. 3, the upstream-side cooling flow path 8044 is formed in the case member 203 on the upstream side and the downstream side of the water path forming member 89.

[0045] The downstream-side cooling flow path 8046 is connected to the downstream side of the upstream-side cooling flow path 8044. The downstream-side cooling flow path 8046 is thermally connected to the drive device 5 accommodated in the third accommodation chamber S3. In this embodiment, the downstream-side cooling flow path 8046 is thermally connected to the transformer Tr and the rectifier circuit 652, which are the remaining parts of the drive device 5 that are not disposed in the second accommodation chamber S2. The downstream-side cooling flow path 8046 includes an axial center flow path 80462 in the shaft member 314.

[0046] In the example shown in FIG. 3, the downstream-side cooling flow path 8046 includes a flow path portion 80461 formed in the case members 202 and 204 on the upstream side of the axial center flow path 80462 in the shaft member 314. Also, in the example shown in FIG. 3, the downstream-side cooling flow path 8046 includes a flow path portion 80463 formed in the case member 202 on the downstream side of the axial center flow path 80462 in the shaft member 314.

[0047] The return flow path 8048 is connected to the downstream side of the downstream side cooling flow path 8046. The downstream side of the return flow path 8048 is connected to the outlet portion 8042. In the example shown in FIG. 3, the return flow path 8048 is formed in the case member 203. Note that the return flow path 8048 may be thermally connected to the stator 320 of the rotating electrical machine 3. The return flow path 8048 may be formed in a manner that extends in the axial direction while circulating around the outer periphery of the stator 320. In this case, the stator 320 (such as the stator coil 322) can be cooled by the cooling water flowing through the return flow path 8048.

[0048] During the operation of the cooling device 80, the cooling water circulates as follows.

[0049] The cooling water discharged from the water pump 82 (see arrow R30 in FIG. 3) is cooled by the radiator 81 and then introduced into the case internal flow path 804 from the inlet portion 8041 (see arrows R31 and R32 in FIG. 3). The cooling water introduced into the case internal flow path 804 cools a part of the drive device 5 disposed in the second accommodation chamber S2 (in this embodiment, the inverter module 70 and the converter module 72) through the upstream side cooling flow path 8044. The cooling water passing through the upstream side cooling flow path 8044 is then introduced into the downstream side cooling flow path 8046.

[0050] The cooling water introduced into the downstream side cooling flow path 8046 cools the remaining part of the drive device 5 accommodated in the third accommodation chamber S3 (in this embodiment, the transformer Tr and the rectifier circuit 652). Thereafter, the cooling water is returned to the suction side of the water pump 82 via the return flow path 8048 and the outlet portion 8042 (see arrow R33 in FIG. 3).

[0051] In this way, according to this embodiment, the transformer Tr and the rectifier circuit 652 can be cooled by using the cooling water that cools the inverter module 70 and the converter module 72. Thereby, the transformer Tr and the rectifier circuit 652 can be efficiently cooled together with the inverter module 70 and the converter module 72.

[0052] Also, according to this embodiment, before cooling the transformer Tr and the rectifier circuit 652, the inverter module 70 and the converter module 72 are cooled. That is, the inverter module 70 and the converter module 72 are cooled by the cooling water in the upstream cooling flow path 8044 close to the radiator 81. Thereby, the transformer Tr and the rectifier circuit 652 can be cooled without reducing the cooling capacity for the inverter module 70 and the converter module 72 with a relatively large heat generation amount.

[0053] In addition, in this embodiment, as shown in FIG. 3, various seal members 99 for preventing leakage of the cooling water in the case internal flow path 804 may be provided on the mating surfaces and the like of the respective case members 201 to 204.

[0054] Next, with reference to FIG. 4, the downstream cooling flow path 8046 and the transformer Tr and the rectifier circuit 652 to be cooled thereby will be further described.

[0055] FIG. 4 is an enlarged view of the Q4 portion in FIG. 3.

[0056] In this embodiment, as schematically shown in FIG. 4, in the transformer Tr, the primary coil 741 is provided in a manner of facing the case 200 (the case member 202 in the example shown in FIG. 4) in the radial direction with respect to the shaft member 314. Also, in the transformer Tr, the secondary coil 742 is provided in a manner of facing the primary coil 741 in the radial direction outside the radial direction of the shaft member 314. Also, the rectifier circuit 652 is provided around the shaft member 314. Note that the rectifier circuit 652 may be mounted on a substrate (not shown) fixed to the shaft member 314 by fitting or the like.

[0057] The flow path portion 80461 of the downstream cooling flow path 8046 passes outside the radial direction of the primary coil 741 in a manner of being thermally connected to the primary coil 741. Thereby, the primary coil 741 can be efficiently cooled. Note that the downstream cooling flow path 8046 may be formed in a manner including a circumferential flow path 80461 that circulates in the entire circumferential direction or a part thereof outside the radial direction of the primary coil 741.

[0058] The axial center flow path 80462 of the shaft member 314 is formed in a manner thermally connected to the secondary side coil 742 and the rectifier circuit 652. That is, the axial center flow path 80462 is formed so as to overlap the secondary side coil 742 and the rectifier circuit 652 when viewed in the radial direction. Thereby, the secondary side coil 742 and the rectifier circuit 652 can be efficiently cooled.

[0059] In FIG. 4, the flow of the cooling water in the downstream side cooling flow path 8046 is schematically shown by arrows R41 to R46.

[0060] As described above, the cooling water that has flowed through the upstream side cooling flow path 8044 flows through the downstream side cooling flow path 8046 in the order of arrows R41 to R46. Specifically, the cooling water introduced into the downstream side cooling flow path 8046 passes near the rectifier circuit 652 and then is introduced into the axial center flow path 80462. In the example shown in FIG. 3, the cooling water is introduced into the axial center flow path 80462 from the end on the X1 side in the X direction and discharged from the end on the X2 side in the X direction (discharged toward the return flow path 8048). In this case, in the configuration in which the primary side coil 741 cools the secondary side coil 742 and the rectifier circuit 652 on the upstream side (the configuration shown in FIG. 3), the downstream side cooling flow path 8046 can be efficiently formed.

[0061] In addition, in the present embodiment, the axial center flow path 80462 is formed so that the cooling water flows in one direction from one side in the axial direction to the other side, but it may be formed so that the cooling water flows in one direction from one side in the axial direction to the other side and then turns back and flows in the reverse direction.

[0062] FIG. 5 is an explanatory view of the cooling device 80B of the vehicle drive device 1B according to a modified example, and is a schematic cross-sectional view of the vehicle drive device 1B. This modified example is different from the configuration shown in FIG. 3 in that the primary side coil 741 cools the secondary side coil 742 and the rectifier circuit 652 on the downstream side. In this case, the cooling water may be introduced into the axial center flow path 80462 from the end on the X2 side in the X direction and discharged from the end on the X1 side in the X direction, as in the upstream side cooling flow path 8044B and the downstream side cooling flow path 8046B shown in FIG. 5.

[0063] Although the above-described embodiments have been described in detail, the present invention is not limited to specific embodiments, and various modifications and changes are possible within the scope described in the claims. Further, it is also possible to combine all or a plurality of the components of the above-described embodiments.

[0064] For example, in the above-described embodiment, the downstream cooling channel 8046 (the same applies to the downstream cooling channel 8046B, and the same shall apply hereinafter) is formed so as to be able to cool both the primary coil 741 and the secondary coil 742 of the transformer Tr, but is not limited thereto. For example, the downstream cooling channel 8046 may be formed so as to cool only one of the primary coil 741 and the secondary coil 742 of the transformer Tr.

[0065] Further, in the above-described embodiment, the primary coil 741 and the secondary coil 742 of the transformer Tr are arranged in a relation of facing each other in the radial direction, but may be arranged in a relation of facing each other in the axial direction.

[0066] Further, in the above-described embodiment, the inverter module 70 and the converter module 72 are cooled by the cooling water in the upstream cooling channel 8044, but only the inverter module 70 may be cooled by the cooling water in the upstream cooling channel 8044. In this case, the converter module 72 may be cooled by other cooling means.

[0067] Further, in the above-described embodiment, the non-contact power supply device 90 is used, but it is also applicable to a contact power supply device.

Explanation of Reference Numerals

[0068] 1A ··· Vehicle drive device, 200 ··· Case, 3 ··· Rotating electric machine, 320 ··· Stator, 322 ··· Stator coil, 310 ··· Rotor (wound field rotor), 316 ··· Rotor coil (field coil), 314 ··· Shaft member, 63 ··· Power conversion circuit section (first power supply device), 64 ··· Power supply circuit section (second power supply device), Tr ··· Transformer (second power supply device), 741 ··· Primary side coil (non-rotating side device, primary side circuit), 742 ··· Secondary side coil (rotating side device, secondary side circuit), 652 ··· Rectifier circuit (rotating side device, second power supply device), 80, 80B ··· Cooling device, 800 ··· Refrigerant flow path, 8044, 8044B ··· Upstream cooling flow path (first refrigerant flow path), 8046, 8046B ··· Downstream cooling flow path (second refrigerant flow path), 80461 ··· Flow path section (non-rotating side flow path), 80462 ··· Axial center flow path (rotating side flow path), 80463 ··· Flow path section (non-rotating side flow path), 81 ··· Radiator (heat dissipation device), S1 ··· First housing chamber, S2 ··· Second housing chamber, S3 ··· Third housing chamber

Claims

1. A rotating electrical machine having a stator around which a coil wire for a stator coil is wound and a rotor around which a coil wire for a field coil is wound, A first power supply device electrically connected between a power source and the coil wire for the stator coil and supplying power to the stator coil, A second power supply device electrically connected between the power source and the coil wire for the field coil and supplying power to the field coil, And a cooling device for circulating a refrigerant through a refrigerant flow path, The second power supply device includes a rotating-side device that rotates with the rotor and a non-rotating-side device that is disposed opposite to the rotating-side device, The refrigerant flow path includes a first refrigerant flow path that cools the first power supply device and a second refrigerant flow path that cools at least one of the rotating-side device and the non-rotating-side device, a vehicle drive device.

2. The second power supply device includes a power supply transformer, The rotating-side device includes a secondary-side circuit of the power supply transformer, The non-rotating-side device includes a primary-side circuit of the power supply transformer, the vehicle drive device according to claim 1.

3. Further provided is a case for housing the rotating electrical machine, the first power supply device, and the second power supply device, The second refrigerant flow path is A non-rotating-side flow path formed in the case for cooling the non-rotating-side device, And a rotating-side flow path formed in a shaft member that rotates with the rotor for cooling the rotating-side device, the vehicle drive device according to claim 2.

4. The case includes a first housing chamber for housing the rotating electrical machine, a second housing chamber for housing the first power supply device, and a third housing chamber for housing a shaft member that rotates with the rotor and the rotating-side device, The cooling device includes a heat radiating device provided in the refrigerant flow path, The refrigerant is cooling water, The vehicle drive device according to claim 3, wherein the second refrigerant flow path is disposed on the downstream side of the first refrigerant flow path in the flow direction of the refrigerant from the heat radiating device.

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