Vehicle drive device

Abstract

Disclosed is a vehicle drive device including: a stator; a winding field rotor around which a coil is wound; a power feeding device which is provided between a power supply and the winding field rotor and feeds power to the winding field rotor in a non-contact manner; and a non-contact type current sensor. The power feeding device has: a fixed side first substrate having a power feeding circuit part electrically connected to the power supply; and a second substrate which has a power reception circuit part electrically connected to the coil, is disposed in a form facing the first substrate, and rotates integrally with the winding field rotor. The non-contact type current sensor is disposed on the first substrate.

Description

Vehicle drive unit

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

[0002] 2. Description of the Related Art In a motor having a rotor wound with a drive coil that generates a magnetic field for rotation, a technique for supplying power to the drive coil in a contactless manner is known.

[0003] JP 2011-10421 A

[0004] In the above-described contactless power supply method, if a current sensor that detects the secondary-side current value (the magnitude of the current flowing through the drive coil) is placed on the secondary side, it becomes necessary to receive the sensor information in a contactless manner. In this case, it may be possible to realize such contactless communication by securing radial space, but this poses a problem that the radial size of the entire device tends to become large.

[0005] Therefore, in one aspect, the present disclosure aims to use a non-contact power supply method while arranging a current sensor that detects the secondary side current value without increasing the radial size of the entire device.

[0006] In one aspect, there is provided a vehicle drive device including: a stator; a wound field rotor around which a coil is wound; a power supply device provided between a power source and the wound field rotor and supplying power to the wound field rotor in a non-contact manner; and a non-contact current sensor, wherein the power supply device includes a first fixed board having a power supply circuit unit electrically connected to the power source; and a second board having a power receiving circuit unit electrically connected to the coil, disposed opposite the first board, and rotating integrally with the wound field rotor, and the non-contact current sensor is disposed on the first board.

[0007] In one aspect, the present disclosure makes it possible to use a non-contact power supply method while positioning a current sensor that detects secondary current without increasing the radial size of the entire device.

[0008] 7 is a configuration diagram showing a vehicle drive system including a drive device for a rotating electric machine according to the present embodiment; FIG. 8 is a schematic cross-sectional view showing a portion of a cross section of a rotating electric machine; FIG. 9 is a plan view showing a schematic configuration of a first layer of a power receiving circuit board; FIG. 10 is a plan view showing a schematic configuration of a second layer of a power receiving circuit board; FIG. 11 is a plan view showing a schematic configuration of a power supply circuit board; FIG. 12 is a schematic cross-sectional view passing through the central axis, showing the relationship between the power supply circuit board and the power receiving circuit board; FIG. 13 is a cross-sectional view of a portion of FIG. 6 illustrating the detection principle of a non-contact current sensor; FIG. 14 is a schematic cross-sectional view passing through the central axis, showing the axial arrangement of each component forming a power supply device; FIG. 15 is a schematic cross-sectional view taken along a plane perpendicular to the axial direction at an axial position along line A-A in FIG. 7; and FIG. 16 is an enlarged view of part Q9 in FIG. 8.

[0009] Each embodiment will be described in detail below with reference to the accompanying drawings. Note that the dimensional ratios in the drawings are merely examples and are not limiting. Furthermore, shapes and the like in the drawings may be partially exaggerated for the sake of explanation. Furthermore, in the drawings, for ease of viewing, reference symbols may be assigned only to some of the parts that exist with the same attribute.

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

[0011] The vehicle drive system 1 has a dual power supply configuration including a low-voltage battery 2A and a high-voltage battery 2B, and includes a vehicle drive device 1 A. The vehicle drive device 1 A includes a rotating electric 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 rated voltage significantly higher than that of the low-voltage battery 2A, for example, a rated voltage of 40 V or more. In this embodiment, as an example, the rated voltage of the high-voltage battery 2B is 300 V or more. The high-voltage battery 2B may also be in the form of a fuel cell or the like.

[0014] The rotating electric machine 3 is a wound field type and includes a rotor 310 having a rotor coil 316 wound around a rotor core 312. As shown in FIG. 2 , the rotor core 312 has teeth 3122 that protrude radially outward, and conductor wires forming the rotor coil 316 are wound around the teeth 3122. A stator 320 is provided radially outward of the rotor 310. As shown in FIG. 2 , the stator coil 322 is wound around the teeth 3210 of the stator core 321.

[0015] The drive device 5 includes a microcomputer 50 (hereinafter referred to as “mc 50 ”) and an electric circuit section 60 .

[0016] The microcomputer 50 may be realized as, for example, an ECU (Electronic Control Unit). 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 a host ECU (not shown) via the network 6. Based on the control commands, the microcomputer 50 controls the rotating electric machine 3 via the electric circuit unit 60. The microcomputer 50 operates based on power from the low-voltage battery 2A.

[0018] The electric circuit section 60 includes a smoothing capacitor 62, a power conversion circuit section 63, a power supply circuit section 64, and a power receiving circuit section 65. The power supply circuit section 64 and the power receiving circuit section 65, together with a transformer Tr, form a power supply device 8 that supplies power to the rotor coil 316 in a contactless manner. The transformer Tr includes a core 74 (see FIG. 7 ), and a primary coil 741 and a secondary coil 742 wound around the core 74.

[0019] The smoothing capacitor 62 is provided between the high potential side line 20 and the low potential side line 22 of the high voltage battery 2B. A resistor R0 for passive discharge may be connected across 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 electric machine 3 under control of the microcomputer 50, which will be described later. The power conversion circuit unit 63 is connected between the high-potential side line 20 and the low-potential side line 22 in parallel with the smoothing capacitor 62. The power conversion circuit unit 63 includes switching elements SW3 on the high-potential side arm and switching elements SW4 on the low-potential side arm. The power conversion circuit unit 63 is controlled by the microcomputer 50 via the drive circuit 52.

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

[0022] The bridge circuit unit 641 is connected in parallel to the smoothing capacitor 62 and the passive discharge resistor R0 between the high potential side line 20 and the low potential side line 22. The bridge circuit unit 641 is in the form of a full bridge circuit and includes switching elements SW1-1 and SW1-2 and switching elements SW2-1 and 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. 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 that they are in parallel with 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, for the sake of distinction, the configuration related to the switching elements SW1-1 and SW2-1 of the switching elements SW1-1, SW1-2, SW2-1, and SW2-2 may be referred to as the "high potential side," and the configuration related to the switching elements SW1-2 and SW2-2 may be referred to as the "low potential side."

[0024] The on / off states of the switching elements SW1-1, SW1-2, SW2-1, and SW2-2 are switched via the drive circuit unit 642. The switching elements SW1-1, SW1-2, SW2-1, and SW2-2 change the state of current flow to the rotor coil 316 under the control of the drive circuit unit 642. The switching elements SW1-1, SW1-2, SW2-1, and SW2-2 are, for example, insulated gate bipolar transistors (IGBTs), but may be of other types such as metal oxide semiconductor field-effect transistors (MOSFETs).

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

[0026] The power receiving circuit unit 65 is a rectifier circuit electrically connected to the secondary coil 742 of the transformer Tr. As shown in FIG. 1 , the power receiving circuit unit 65 may be a diode bridge circuit. The power receiving circuit unit 65 is electrically connected between the secondary coil 742 and the rotor coil 316. The power receiving circuit unit 65 rectifies the current (drive current) on the secondary side of the transformer Tr and supplies the rectified current to the rotor coil 316.

[0027] Next, various structures related to the power supply device 8 will be described.

[0028] In the following description, the axial direction refers to the direction in which the central axis I of the rotor 310 (see FIG. 3 , etc.) extends, and the radial direction refers to the radial direction centered on the central axis I. Therefore, the radially outer side refers to the side away from the central axis I relative to that position, and the radially inner side refers to the side toward the central axis I relative to that position. Furthermore, the axially outer side refers to the side away from the axial center of the rotor 310 relative to that position, and the axially inner side refers to the side closer to the axial center of the rotor 310 relative to that position. Furthermore, the circumferential direction corresponds to the direction of rotation around the central axis I.

[0029] Fig. 3 is a plan view schematically showing the configuration of the first layer (hereinafter also referred to as "side A") of the power receiving circuit board 91, and Fig. 4 is a plan view schematically showing the configuration of the second layer (hereinafter also referred to as "side B") of the power receiving circuit board 91. In Figs. 3 and 4, for ease of viewing, insulating areas (areas on which no components or circuits are mounted) of each surface of the power receiving circuit board 91 are hatched. For convenience of explanation, Figs. 3 and 4 also show positioning pins Pn as elements other than the power receiving circuit board 91 and the mounted components (including circuits).

[0030] When viewed in the axial direction, the power receiving circuit board 91 has an annular shape about the central axis I. That is, the power receiving circuit board 91 has an annular shape with a central hole centered on the central axis I. In this case, the rotating shaft 314 of the rotor 310 (see FIG. 7 ) may be inserted through the central hole of the power receiving circuit board 91.

[0031] The above-described power receiving circuit unit 65 is mounted on surface A of the power receiving circuit board 91. In this embodiment, the power receiving circuit unit 65 includes a positive side circuit 6521 and a negative side circuit 6522.

[0032] One end of the positive circuit 6521 is electrically connected to the high potential side of the power supply (see P in FIG. 1) via a transformer Tr or the like, and the other end is electrically connected to the rotor coil 316. More specifically, one end of the positive circuit 6521 is connected to a terminal 6511 (FIG. 1) of the secondary coil 742 via a terminal 65210 (FIG. 1). The other end of the positive circuit 6521 is connected to a terminal 3161 (FIG. 1) of the rotor coil 316 via a positive terminal 65211 (FIGS. 1 and 3).

[0033] 3, the positive-side circuit 6521 has a wiring pattern 6215 extending in the circumferential direction (hereinafter also referred to as the "positive-side circumferential wiring pattern 6215"). The positive-side circumferential wiring pattern 6215 extends in the circumferential direction over an angular range of approximately 180 degrees of the entire circumference of the power receiving circuit board 91. In this case, the positive-side circuit 6521 has diodes D1 and D3, which are rectifying elements, located radially inward of the positive-side circumferential wiring pattern 6215.

[0034] The positive electrode circumferential wiring pattern 6215 preferably extends in the circumferential direction over an angular range of approximately 180 degrees with a constant radial width.

[0035] One end of the negative circuit 6522 is electrically connected to the low potential side of the power supply (see N in FIG. 1) via a transformer Tr or the like, and the other end is electrically connected to the rotor coil 316. More specifically, one end of the negative circuit 6522 is connected to the terminal 6512 (FIG. 1) of the secondary coil 742 via the terminal 65220 (FIG. 1). The other end of the negative circuit 6522 is connected to the terminal 3162 (FIG. 1) of the rotor coil 316 via the negative terminal 65221 (FIGS. 1 and 3).

[0036] As shown in FIG. 3 , the negative side circuit 6522 has a wiring pattern 6225 (hereinafter also referred to as the “negative circumferential wiring pattern 6225”) extending in the circumferential direction. The negative circumferential wiring pattern 6225 extends in the circumferential direction over an angular range of approximately 180 degrees, which is different from the angular range of the positive circumferential wiring pattern 6215, over the entire circumference of the power receiving circuit board 91. Thus, in this embodiment, the positive circumferential wiring pattern 6215 and the negative circumferential wiring pattern 6225 each extend in the circumferential direction around the outer periphery of side A of the power receiving circuit board 91 over an angular range of just under 180 degrees, diagonally opposite each other. In this case, the negative side circuit 6522 has diodes D2 and D4, which are rectifying elements, located radially inward of the negative circumferential wiring pattern 6225.

[0037] The negative electrode circumferential wiring pattern 6225 preferably extends in the circumferential direction over an angular range of approximately 180 degrees with a constant radial width.

[0038] The B-side of the power receiving circuit board 91 has a ground pattern 919 at ground potential extending in the circumferential direction. The ground pattern 919 may be electrically connected to a member at ground potential (e.g., the support member 92 in FIG. 7 ) via a positioning pin Pn. The ground pattern 919 extends over the entire circumferential direction. When viewed in the axial direction, the ground pattern 919 overlaps with the positive electrode circumferential wiring pattern 6215 and the negative electrode circumferential wiring pattern 6225. In this case, when viewed in the axial direction, the ground pattern 919 may overlap in a manner that encompasses the positive electrode circumferential wiring pattern 6215 and the negative electrode circumferential wiring pattern 6225. The technical significance of the ground pattern 919 will be described later.

[0039] On surface B of the power receiving circuit board 91, a wiring portion 6528 to the secondary coil 742 of the transformer Tr is formed radially inward of the ground pattern 919. The wiring portion 6528 connects the midpoints of the diodes D1 and D2 to one end of the secondary coil 742, and also connects the midpoints of the diodes D3 and D4 to the other end of the secondary coil 742.

[0040] Fig. 5 is a plan view schematically showing the configuration of the power supply circuit board 81. Fig. 6 is a schematic cross-sectional view passing through the central axis I, showing the relationship between the power supply circuit board 81 and the power receiving circuit board 91. Fig. 6A is a cross-sectional view of a portion of Fig. 6 that explains the detection principle of the non-contact current sensor 70.

[0041] The power supply circuit board 81 is fixed to the case 4 (see FIG. 7 ). The case 4 may be part of a motor case that houses the rotating electric machine 3.

[0042] The above-described power supply circuit unit 64 is mounted on the power supply circuit board 81. Note that the power supply circuit unit 64 is not shown in Fig. 5 . The power supply circuit unit 64 may be formed on the surface opposite to the surface shown in Fig. 5 . Also, Fig. 5 schematically shows part of a wiring portion 6418 from the power supply circuit unit 64 to the primary coil 741.

[0043] The power supply circuit board 81 has a circular shape about the central axis I when viewed in the axial direction. However, the power supply circuit board 81 may also have an annular shape having a central hole centered on the central axis I. In this case, the rotating shaft 314 (see FIG. 7 ) of the rotor 310 may be inserted through the central hole of the power supply circuit board 81 while being spaced apart in the radial direction. As shown in FIG. 6 , the power supply circuit board 81 is disposed so as to face side A of the power receiving circuit board 91 in the axial direction.

[0044] A non-contact current sensor 70 is provided on the surface of the power supply circuit board 81 facing the power receiving circuit board 91. The non-contact current sensor 70 is provided at a radial position that can axially face the positive circumferential wiring pattern 6215 and the negative circumferential wiring pattern 6225. When a current flows through the positive circumferential wiring pattern 6215, the current flows in a direction perpendicular to the paper surface, corresponding to the tangential direction of the positive circumferential wiring pattern 6215, as viewed in the cross section of FIG. 6A . For example, as shown in FIG. 6A , when a current flows from the front side to the back side of the paper (direction indicated by I6 in FIG. 6A ), a clockwise magnetic field (indicated by R6 in FIG. 6A ) is generated around the positive circumferential wiring pattern 6215 in the cross section. The strength of this magnetic field correlates with the magnitude of the current (Ampere's law). In this case, the non-contact current sensor 70 includes a Hall element and generates an electrical signal corresponding to the strength of the magnetic field (i.e., an electrical signal corresponding to the magnitude of the current). The non-contact current sensor 70 may be provided at two or more locations along the circumferential direction. As the rotating electric machine 3 rotates, one non-contact current sensor 70 axially faces either the positive circumferential wiring pattern 6215 or the negative circumferential wiring pattern 6225 depending on the rotational phase of the rotor 310. Within a mechanical angle range in which the one non-contact current sensor 70 axially faces the positive circumferential wiring pattern 6215, the state shown in FIG. 6A is formed, and the one non-contact current sensor 70 generates an electrical signal corresponding to the magnitude of the current flowing through the positive circumferential wiring pattern 6215. Similarly, within a mechanical angle range in which the one non-contact current sensor 70 axially faces the negative circumferential wiring pattern 6225, the one non-contact current sensor 70 generates an electrical signal corresponding to the magnitude of the current flowing through the negative circumferential wiring pattern 6225. In this way, according to this embodiment, the magnitude of the current flowing through the rotor coil 316 (secondary-side current value) can be detected using a non-contact power supply system. In this case, in this embodiment, two boards (the power supply circuit board 81 and the power receiving circuit board 91) arranged adjacent to each other in the axial direction can be used to arrange the non-contact current sensor 70 axially facing the positive electrode circumferential wiring pattern 6215 and the negative electrode circumferential wiring pattern 6225.This allows the non-contact current sensor 70 to be arranged without increasing the radial size of these two boards (the power supply circuit board 81 and the power receiving circuit board 91). In this way, according to this embodiment, the current sensor 70 that detects the secondary side current value can be arranged without increasing the radial size of the entire vehicle drive device 1A while using a non-contact power supply method.

[0045] In this embodiment, the mechanical angle range over which the one non-contact current sensor 70 axially faces the positive circumferential wiring pattern 6215 corresponds to the angle of the circumferential range of the positive circumferential wiring pattern 6215, which is approximately 180 degrees as described above. Also, the mechanical angle range over which the one non-contact current sensor 70 axially faces the negative circumferential wiring pattern 6225 corresponds to the angle of the circumferential range of the negative circumferential wiring pattern 6225, which is approximately 180 degrees as described above. In this case, the one non-contact current sensor 70 can obtain an electrical signal corresponding to the magnitude of the current flowing through the rotor coil 316 at substantially any timing.

[0046] In this embodiment, the non-contact current sensor 70 is provided at two locations along the circumferential direction, spaced 180 degrees apart. However, in a modified example, the non-contact current sensor 70 may be provided at three or more locations along the circumferential direction, or at only one location.

[0047] Next, with reference to FIG. 7 and subsequent figures, a preferred example of the axial arrangement of the components that form the power supply device 8 will be described.

[0048] FIG. 7 is a schematic cross-sectional view passing through the central axis I, illustrating the axial arrangement of the components forming the power supply device 8. FIG. 7 also illustrates the stator 320, the rotor 310, and the rotating shaft 314, along with the power supply device 8. Also, FIG. 7 shows, in dotted lines, a wiring portion 6418 from the power supply circuit board 81 to the primary coil 741 and a wiring portion 6518 from the power receiving circuit board 91 to the secondary coil 742. FIG. 8 is a schematic cross-sectional view taken along a plane perpendicular to the axial direction at an axial position along line A-A in FIG. 7. FIG. 9 is an enlarged view of portion Q9 in FIG. 8.

[0049] In FIG. 7, an X direction parallel to the axial direction, an X1 side which is one side of the X direction, and an X2 side which is the other side of the X direction are defined.

[0050] 7 , the power supply circuit board 81, the power receiving circuit board 91, the transformer Tr, and the rotor 310 are arranged in this order in the axial direction. In this case, as described above, the surface A of the power receiving circuit board 91 can be directly opposed to the power supply circuit board 81 in the axial direction. This allows the power receiving circuit board 91 and the power supply circuit board 81 to be positioned close to each other in the axial direction, thereby improving the detection accuracy of the non-contact current sensor 70.

[0051] Furthermore, the transformer Tr and the stator coil 322 (see FIG. 2), which could be noise sources that reduce the detection accuracy of the current sensor 70, can be disposed on the X2 side of the power receiving circuit board 91. This improves the detection accuracy of the non-contact current sensor 70. Furthermore, in this embodiment, as described above, the ground pattern 919 is provided on the B side (the surface on the X2 side) of the power receiving circuit board 91. This further improves noise resistance (and therefore reliability of the sensor information from the current sensor 70) due to the shielding effect of the ground pattern 919 between the noise source and the current sensor 70 (or the circumferential wiring patterns 6215, 6225).

[0052] In this embodiment, the power receiving circuit board 91 is supported on the X2 side by a support member 92. The support member 92 may be made of, for example, a metal material. In this case, too, the shielding effect of the support member 92 can further improve noise resistance.

[0053] The support member 92 has a central hole 924 into which the rotation shaft 314 is fitted. The support member 92 is coupled to the rotation shaft 314 in a manner that allows the support member 92 to rotate integrally with the rotation shaft 314. For example, the support member 92 may be coupled to the rotation shaft 314 via key fitting using a key groove or fitting using a press fit.

[0054] The support member 92 includes an annular board support portion 921 and a sleeve 922, and a central hole 924 is formed so as to penetrate the board support portion 921 and the sleeve 922. The board support portion 921 supports the power receiving circuit board 91 so as to abut against surface B of the power receiving circuit board 91 in the axial direction.

[0055] As described above, the sleeve 922 is fitted with the rotating shaft 314 on the radially inner side, and the secondary core 74-2 of the transformer Tr is fitted with the sleeve 922 on the radially outer side. The sleeve 922 and the secondary core 74-2 may be integrally coupled to each other via key fitting using a key groove or fitting by press fitting, similar to the manner of coupling between the support member 92 and the rotating shaft 314. In this case, as shown in FIG. 7 , the primary coil 741 of the transformer Tr may be wound radially outer than the secondary coil 742. The primary core 74-1 of the transformer Tr is fixed to the case 4.

[0056] In this embodiment, as shown in FIGS. 8 and 9 , electrical connection between the rotor coil 316 and the power receiving circuit unit 65 is achieved via a gap between the support member 92 and the rotating shaft 314. In the example shown in FIG. 9 , this gap is formed by a recess 925 on the inner circumferential surface of the support member 92 (the inner circumferential surface of the sleeve 922). The recess 925 is formed on the inner circumferential surface of the support member 92 so as to be recessed radially inward. As shown in FIG. 9 , two recesses 925 may be provided, one on the positive side and one on the negative side. In this case, the positive electrode lead wire 31610 and the negative electrode lead wire 31620 from the rotor coil 316 can extend axially through the corresponding recesses 925.

[0057] With this configuration, even if a transformer Tr is disposed axially between the rotor 310 and the power receiving circuit board 91, electrical connection can be achieved between the rotor coil 316 of the rotor 310 and the power receiving circuit unit 65 (not shown in FIG. 7 ) of the power receiving circuit board 91, straddling the transformer Tr. In other words, even if a transformer Tr, which is a noise source, is disposed axially between the rotor 310 and the power receiving circuit board 91 to improve the detection accuracy of the non-contact current sensor 70, appropriate electrical connection can be established between the rotor coil 316 of the rotor 310 and the power receiving circuit unit 65 of the power receiving circuit board 91.

[0058] Although each embodiment has been described in detail above, it is not limited to the specific embodiment, and various modifications and changes are possible within the scope of the claims. It is also possible to combine all or a plurality of components of the above-described embodiments.

[0059] For example, in the above-described embodiment, the power receiving circuit board 91 is a single-layer board, but it may be a multi-layer board. In this case, the ground pattern 919 may be formed on an inner layer, or may be formed across two or more layers.

[0060] In the above-described embodiment, the support member 92 has an annular shape about the central axis I when viewed in the axial direction. That is, the support member 92 has an annular shape having a central hole 924 centered on the central axis I. However, in a modified example, the support member 92 may have a circular shape centered on the central axis I (i.e., a shape without a central hole). In this case, the support member 92 may be fixed to the rotor 310 via an end cover (a member that covers the rotor coil 316 from the axial outside) of the rotor 310, or may be formed integrally with the end cover. Note that in such a modified example, the power receiving circuit board 91 may also have a circular shape centered on the central axis I (i.e., a shape without a central hole).

[0061] 1A...vehicle drive device, 3...rotating electric machine, 320...stator, 310...rotor (wound field rotor), 314...rotating shaft, 316...rotor coil (coil), 8...power supply device, 81...power supply circuit board (second board), 91...power receiving circuit board (first board), 92...support member, Tr...transformer, D1 to D4...diodes (rectifying elements), 919...ground pattern (ground potential pattern), 6215, 6225...circumferential wiring pattern (wiring pattern)

Claims

1. A vehicle drive device comprising: a stator; a wound field rotor around which a coil is wound; a power supply device provided between a power source and the wound field rotor and supplying power to the wound field rotor in a non-contact manner; and a non-contact current sensor, wherein the power supply device has a first fixed board having a power supply circuit section electrically connected to the power source, and a second board having a power receiving circuit section electrically connected to the coil, arranged facing the first board, and rotating integrally with the wound field rotor, and the non-contact current sensor is arranged on the first board.

2. A vehicle drive device as described in claim 1, wherein the second board is axially opposed to the first board, the power receiving circuit unit is mounted on a surface of the second board that faces the first board in the axial direction, the non-contact current sensor is mounted on a surface of the first board that faces the second board in the axial direction, and the non-contact current sensor and the power receiving circuit unit are arranged at the same radial position.

3. A vehicle drive device as described in claim 2, wherein the second substrate has an annular or circular shape about an axis related to the winding field rotor, and the power receiving circuit section has a rectifying element and a wiring pattern extending circumferentially, radially outward from the rectifying element and at a radial position overlapping with the non-contact current sensor when viewed in the axial direction.

4. A vehicle drive device as described in claim 3, wherein a ground potential pattern extending in a circumferential direction is formed on a surface or inner layer of the second substrate on a side not axially facing the first substrate, and the ground potential pattern and the wiring pattern overlap when viewed in the axial direction.

5. A vehicle drive device as claimed in any one of claims 1 to 4, wherein the power supply device further has a transformer, the second board has a circular ring shape when viewed in the axial direction and is supported by a support member also having a circular ring shape when viewed in the axial direction, a rotating shaft of the wound field rotor passes through the second board and the support member in the axial direction, the first board, the second board, the transformer, and the wound field rotor are arranged in this order in the axial direction, and an electrical connection between the coil of the wound field rotor and the power receiving circuit section of the second board is realized via a gap between the support member and the rotating shaft.

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