Rotating electric machines and drive systems

Abstract

To provide a rotating electric machine that can be easily assembled. [Solution] The rotating electric machine 10 comprises a motor 2, a control unit 7, a busbar unit 70, and a housing 6. The housing has a control chamber 6C where the control unit is located, a motor chamber 6A where the motor is located, and a partition wall 65 that separates the control chamber and the motor chamber. The partition wall has a through hole 65c that penetrates axially and a fixing hole 65d. The busbar 71 passes through the through hole. The busbar unit has a busbar holder 80 that supports a plurality of busbars and has a positioning surface that contacts a first surface 65a, a first fastening part 85 fixed to the busbar holder, and a second fastening part 86 fastened to the first fastening part. The first fastening part and the second fastening part are fastened to each other via the fixing hole. The second fastening part has a fastening surface that contacts a second surface 65b.

Description

Technical Field

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[0001] The present invention relates to a rotating electric machine and a driving device.

Background Art

[0002] Conventionally, a rotating electric machine including a motor and an inverter connected to the motor is known. In such a rotating electric machine, a bus bar electrically connecting the motor and the inverter may be passed through a hole provided at the boundary between the inverter case and the motor case.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the conventional structure, for example, the bus bar may be assembled by passing it through a hole from the side of the motor chamber where the motor is arranged. However, in the case of the conventional structure, there is a problem that the connection terminal of the motor and the bus bar are likely to interfere with each other in the process of passing the bus bar through the hole, and the assembly process becomes complicated.

[0005] One aspect of the present invention aims to provide a rotating electric machine and a driving device that can be easily assembled in view of the above problems.

Means for Solving the Problems

[0006] A rotating electric machine according to one embodiment of the present invention comprises a motor having a rotor rotatable about a central axis and a stator facing the rotor, a control unit for controlling the motor, a busbar unit having a plurality of busbars for electrically connecting the motor and the control unit, and a housing that houses the motor, the control unit, and the busbar unit in its internal space. The housing has a control room where the control unit is located, a motor room where the motor is located, and a partition wall separating the control room and the motor room. The partition wall extends along a plane intersecting the axial direction of the central axis. The partition wall has a first surface, a second surface, a through hole penetrating the partition wall in the axial direction, and a fixing hole penetrating the partition wall in the axial direction. One of the first surface and the second surface faces the control room side. The other of the first surface and the second surface faces the motor room side. At least a portion of the busbars passes through the through hole. The busbar unit includes a busbar holder that supports the plurality of busbars and has a positioning surface that contacts the first surface, a first fastening portion fixed to the busbar holder, and a second fastening portion fastened to the first fastening portion. The first fastening portion and the second fastening portion are fastened to each other via the fixing hole. The second fastening portion has a fastening surface that contacts the second surface.

[0007] A drive device according to one embodiment of the present invention comprises the above-described rotating electric machine and a power transmission unit that transmits power from the rotating electric machine. [Effects of the Invention]

[0008] According to an aspect of the present invention, a rotating electric machine and a drive device that can be easily assembled are provided. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a schematic diagram of the drive device of the first embodiment. [Figure 2] Figure 2 is a front view of the motor cover of the first embodiment, viewed from one side in the axial direction. [Figure 3]Figure 3 is an enlarged view of region III in Figure 2. [Figure 4] Figure 4 is a cross-sectional view of the busbar unit and control room of the first embodiment. [Figure 5] Figure 5 is a front view of the busbar unit and motor room of the first embodiment. [Figure 6] Figure 6 is a perspective view of the busbar unit and control room of the first embodiment. [Figure 7] Figure 7 is a perspective view of the busbar unit and motor room of the first embodiment. [Figure 8] Figure 8 is a schematic diagram of the busbar unit and partition wall in the drive unit of the second embodiment. [Modes for carrying out the invention]

[0010] The following description will explain a rotating electric machine and a drive unit according to one embodiment of the present invention, with reference to the drawings. In the following description, the vertical direction will be defined and explained based on the positional relationship when the drive unit is mounted on a vehicle located on a horizontal road surface.

[0011] The drawings show the XYZ coordinate system as a three-dimensional Cartesian coordinate system where appropriate. In the XYZ coordinate system, the direction in which the Z axis extends is the vertical direction. The vertical direction is, for example, the vertical direction. Note that in this specification, the vertical direction means the vertical direction from one viewpoint and does not necessarily mean the vertical direction. The direction in which the X axis extends is the longitudinal direction of the vehicle on which the drive unit 100 is mounted. The direction in which the Y axis extends is perpendicular to both the X and Z axes and is parallel to the central axis J of the motor 2. The direction in which the Y axis extends is the lateral direction of the vehicle, that is, the vehicle width direction.

[0012] In the following explanation, unless otherwise specified, the direction parallel to the central axis J of motor 2 (the Y-axis direction) will simply be referred to as the "axial direction." Furthermore, the radial direction centered on the central axis J will simply be referred to as the "radial direction," and the circumferential direction centered on the central axis J, that is, the direction around the axis of the central axis J, will simply be referred to as the "circumferential direction."

[0013] In this specification, two directions that are orthogonal to the axial direction Y and orthogonal to each other are defined as the first direction Z and the second direction X. In this specification, the first direction Z is the vertical direction, and the second direction X is the longitudinal direction of the vehicle. The one side (+Z) of the first direction is the side towards which the arrow indicating the Z axis in the figure points, and the other side (-Z) of the first direction is the opposite side of the side towards which the arrow indicating the Z axis in the figure points; the one side (-X) of the second direction is the opposite side of the side towards which the arrow indicating the X axis in the figure points, and the other side (+X) of the second direction is the side towards which the arrow indicating the X axis in the figure points; the one side (+Y) of the axial direction is the side towards which the arrow indicating the Y axis in the figure points, and the other side (-Y) of the axial direction is the opposite side of the side towards which the arrow indicating the Y axis in the figure points.

[0014] [First Embodiment] [Drive Device] FIG. 1 is a schematic diagram of a drive device 100 according to the first embodiment. The drive device 100 of the present embodiment is mounted on a vehicle powered by a motor, such as a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHV), or an electric vehicle (EV), and is used as its power source. Further, the drive device 100 may be mounted on equipment other than a vehicle and used as its power source.

[0015] The drive device 100 includes a rotating electric machine 10 and a power transmission unit 3. Although not shown, the power transmission unit 3 has a plurality of gears. The power transmission unit 3 transmits the power of the rotating electric machine 10 and outputs it to the outside.

[0016] [Rotating Electric Machine] The rotating electric machine 10 has both a function of outputting power as an electric motor and a function of generating electricity as a generator. Further, the rotating electric machine 10 may be used as either an electric motor or a generator. The rotating electric machine 10 includes a housing 6, a motor 2, a control unit 7, and a busbar unit 70.

[0017] [Housing] The housing 6 houses the motor 2, the control unit 7, and the bus bar unit 70 in its internal space. The housing 6 has a motor chamber 6A where the motor 2 is disposed, a gear chamber 6B where the power transmission unit 3 is disposed, and a control chamber 6C where the control unit 7 is disposed. That is, the internal space of the housing 6 is partitioned into the motor chamber 6A, the gear chamber 6B, and the control chamber 6C. The gear chamber 6B is located on the other axial side (-Y) with respect to the motor chamber 6A. The control chamber 6C is located on the outer side in the radial direction of the motor chamber 6A and on one side (+Z) in the first direction. That is, the control chamber 6C is located on the outer side in the radial direction of the motor 2.

[0018] The housing 6 has a housing body 64, a motor cover 61, and a lid member 62. The motor cover 61 and the lid member 62 are each fixed to the housing body 64. The housing body 64, the motor cover 61, and the lid member 62 are made of, for example, aluminum die-cast.

[0019] The housing body 64 has a cylindrical wall portion 66 extending along the central axis J, a cylindrical bottom portion 67 extending radially inward from the end on the other axial side (-Y) of the cylindrical wall portion 66, and a box-shaped portion 68 disposed on the outer side in the radial direction of the cylindrical wall portion 66.

[0020] The cylindrical wall portion 66 is a substantially cylindrical member. The cylindrical wall portion 66 surrounds the motor 2 from the outer side in the radial direction. The cylindrical wall portion 66 is open on one axial side (+Y). The opening of the cylindrical wall portion 66 is closed by the motor cover 61. The motor chamber 6A is a space surrounded by the cylindrical wall portion 66, the cylindrical bottom portion 67, and the motor cover 61.

[0021] The cylindrical wall portion 66 has an outer cylindrical portion 66a, an inner cylindrical portion 66b, and an extension portion 66c. The outer cylindrical portion 66a and the inner cylindrical portion 66b are cylindrical members. In the present embodiment, the outer cylindrical portion 66a and the inner cylindrical portion 66b are cylindrical with the central axis J as the center.

[0022] The expansion portion 66c is connected to one axial side (+Y) of the outer cylindrical portion 66a. The expansion portion 66c has a shape in which a part of its circumferential direction extends radially outward relative to the outer cylindrical portion 66a. At least a part of the expansion portion 66c is located one axial side (+Y) of the box-shaped portion 68. A part of the motor chamber 6A is on one axial side (+Y) of the box-shaped portion 68 and extends radially inward to the expansion portion 66c. In this embodiment, the region of the motor chamber 6A located on one axial side (+Y) of the box-shaped portion 68 is called the expansion space 6D. In other words, the expansion space 6D is the region located axially between the box-shaped portion 68 and the motor cover 61. When viewed from the axial direction Y, the expansion space 6D is located radially inward of the expansion portion 66c and radially outward of the outer cylindrical portion 66a. The expansion space 6D is also located on one axial side (+Y) of the control chamber 6C. A portion of the busbar unit 70 is located in the extended space 6D.

[0023] A partition wall 65, which is part of the box-shaped section 68, is located between the expanded space 6D and the control room 6C. That is, the housing 6 has a partition wall 65 that separates the motor room 6A and the control room 6C. The partition wall 65 is part of the box-shaped section 68 and also part of the expanded section 66c described above. In this embodiment, the partition wall 65 extends along a plane perpendicular to the axial direction Y. However, it is sufficient for the partition wall 65 to extend along a plane intersecting the axial direction Y.

[0024] The outer cylindrical portion 66a and the inner cylindrical portion 66b surround the motor 2 from the radially outer side. The cylindrical wall portion 66 has a two-layer structure due to the outer cylindrical portion 66a and the inner cylindrical portion 66b. In this embodiment, the case in which the cylindrical wall portion 66 is composed of multiple cylindrical bodies (outer cylindrical portion 66a and inner cylindrical portion 66b) has been described, but the cylindrical wall portion 66 may be composed of a single cylindrical body. The inner cylindrical portion 66b and the outer cylindrical portion 66a face each other radially with a gap in between. The end of the inner cylindrical portion 66b on one axial side (+Y) is joined to the inner surface of the outer cylindrical portion 66a.

[0025] A flow path partitioning rib 66d is provided on the outer circumferential surface of the inner cylindrical portion 66b. The flow path partitioning rib 66d extends spirally around the central axis J. In this embodiment, the radially outer tip of the flow path partitioning rib 66d contacts the inner circumferential surface of the outer cylindrical portion 66a. As a result, the flow path partitioning rib 66d partitions the space between the outer circumferential surface of the inner cylindrical portion 66b and the outer cylindrical portion 66a, forming a spiral flow path 6F. Note that the radially outer tip of the flow path partitioning rib 66d may not contact the inner circumferential surface of the outer cylindrical portion 66a, but may be facing it with a gap in between.

[0026] The flow path 6F is provided between the outer cylindrical portion 66a and the inner cylindrical portion 66b. More specifically, the flow path 6F is provided radially inside the outer cylindrical portion 66a and radially outside the inner cylindrical portion 66b. The flow path 6F extends spirally around the central axis J. The flow path 6F surrounds the stator 30 from the radial outside. The fluid flowing through the flow path 6F cools the stator core 32 via the inner cylindrical portion 66b.

[0027] In this embodiment, the case in which the flow path 6F extends in a spiral shape has been described. However, the flow path 6F is not limited to this embodiment as long as it is arranged around the stator 30. The flow path 6F may be a meandering flow path in the axial direction Y or in the circumferential direction.

[0028] The inner cylindrical portion 66b surrounds the stator 30 from the radially outer side and holds the stator 30. In this embodiment, the stator 30 is fixed to the inner circumferential surface of the cylindrical wall portion 66 by press-fitting. In this embodiment, the stator 30 is fixed to the inner circumferential surface of the cylindrical wall portion 66 by shrink-fitting. Therefore, there is no need to use fastening members such as bolts and nuts to fix the stator 30 to the housing 6. As a result, the number of parts of the rotating electric machine 10 can be reduced.

[0029] When the stator 30 is press-fitted into the housing 6, deformation of the housing 6 may occur during the press-fitting process. Therefore, if other components (e.g., the busbar unit 70) are fixed to the housing 6 before the stator 30 is fixed to the housing 6, the deformation of the housing 6 may put a load on the other components. In particular, if shrink-fitting is used as the press-fitting method, the heat generated during shrink-fitting may put a load on the other components (e.g., the busbar unit 70). For this reason, when press-fitting is used as the fixing method for the stator 30, it is desirable to fix the other components to the housing 6 after the stator 30 has been press-fitted into the housing 6. As will be described later, the busbar unit 70 of this embodiment can improve the workability of assembly to the housing 6 to which the stator 30 is fixed.

[0030] The cylindrical bottom portion 67, like the cylindrical wall portion 66, has a two-layer structure. The cylindrical bottom portion 67 has a first bottom portion 67a and a second bottom portion 67b. More specifically, the first bottom portion 67a is substantially plate-shaped and is provided at the end of the outer cylindrical portion 66a on the other axial side (-Y). The first bottom portion 67a closes the opening of the outer cylindrical portion 66a on the other axial side (-Y). The second bottom portion 67b is substantially plate-shaped and is provided at the end of the inner cylindrical portion 66b on the other axial side (-Y). The second bottom portion 67b closes the opening of the inner cylindrical portion 66b on the other axial side (-Y). The first bottom portion 67a and the second bottom portion 67b face each other in the axial direction Y with a gap in between. The second bottom portion 67b is located on one axial side (+Y) relative to the first bottom portion 67a. The radially inner end of the second bottom portion 67b is joined to the first bottom portion 67a.

[0031] In this embodiment, the inner cylindrical portion 66b and the second bottom portion 67b are composed of a single component, the water jacket member 63. The water jacket member 63 is inserted into the interior of the outer cylindrical portion 66a.

[0032] The motor cover 61 is fixed to the cylindrical wall portion 66 and covers the opening of the cylindrical wall portion 66. The motor cover 61 also covers the motor 2 from one axial side (+Y). The motor cover 61 faces the cylindrical bottom portion 67 in the axial direction Y. The cylindrical bottom portion 67 and the motor cover 61 hold the bearings 26 and 27, respectively.

[0033] The motor cover 61 has a first region 61A, a second region 61B, and a boundary portion 61p. The first region 61A and the second region 61B are each flat. The first region 61A is positioned one axial side (+Y) of the second region 61B. The second region 61B is connected to the radially inward side of the first region 61A. The boundary portion 61p is a stepped portion between the first region 61A and the second region 61B. That is, the first region 61A and the second region 61B are connected to each other via the boundary portion 61p.

[0034] The motor cover 61 has an inner surface 61f facing the other axial direction (-Y) and an outer surface 61g facing the one axial direction (+Y). As described above, the first region 61A is positioned one axial direction (+Y) from the second region 61B. In other words, on the inner surface 61f, a recess 61d is provided in the portion that overlaps with the first region 61A in the axial direction (Y), recessed in one axial direction (+Y). Similarly, on the outer surface 61g, a protrusion 61e is provided in the portion that overlaps with the first region 61A in the axial direction (Y), protruding in one axial direction (+Y).

[0035] The partition wall portion 65 has a first surface 65a, a second surface 65b, a through hole 65c, a plurality of fixing holes 65d, and a plurality of positioning holes (first fitting portion) 65h. In this embodiment, there are two fixing holes 65d and two positioning holes (first fitting portion) 65h.

[0036] The first surface 65a and the second surface 65b are wall surfaces of the partition wall 65, and face opposite each other in the axial direction Y. In this embodiment, the first surface 65a faces the other axial direction (-Y), and the second surface 65b faces the one axial direction (+Y). That is, the first surface 65a faces the control room 6C side, and the second surface 65b faces the motor room 6A side. The second surface 65b faces the motor cover 61 in the axial direction Y. The second surface 65b is covered by the motor cover 61 from the axial direction Y.

[0037] The through-hole 65c penetrates the partition wall 65 in the axial direction Y. The fixing hole 65d penetrates the partition wall 65 in the axial direction Y. Similarly, the positioning hole 65h penetrates the partition wall 65 in the axial direction Y. The through-hole 65c, fixing hole 65d, and positioning hole 65h connect the expanded space 6D (i.e., the motor room 6A) and the control room 6C. In this embodiment, the through-hole 65c is substantially rectangular when viewed from the axial direction Y. A busbar unit 70 is inserted into the through-hole 65c. In this embodiment, the fixing hole 65d and positioning hole 65h are substantially circular when viewed from the axial direction Y. Note that the shapes of the through-hole 65c, fixing hole 65d, and positioning hole 65h are not limited to this embodiment and may be other shapes.

[0038] The box-shaped portion 68 is located radially outward of the motor 2 and on one side in the first direction (+Z). The box-shaped portion 68 opens radially outward of the motor 2 and on one side in the first direction (+Z). The opening of the box-shaped portion 68 is closed by the lid member 62. The control room 6C is the space enclosed by the box-shaped portion 68 and the lid member 62.

[0039] The box-shaped portion 68 has a bottom wall portion (wall portion) 68a. That is, the housing 6 has a bottom wall portion 68a. The bottom wall portion 68a is located on the other side (-Z) of the lid member 62 in the first direction. The bottom wall portion 68a faces the lid member 62 in the first direction Z. The bottom wall portion 68a is located radially inward of the control chamber 6C. Part of the bottom wall portion 68a is also part of the outer cylindrical portion 66a. Therefore, part of the bottom wall portion 68a separates the control chamber 6C from the motor chamber 6A. The busbar unit 70 is fixed to the bottom wall portion 68a. That is, the bottom wall portion 68a supports the busbar unit 70 from the radial inward side. In other words, the bottom wall portion 68a supports the busbar unit 70 in the first direction Z.

[0040] <motor> Motor 2 in this embodiment is a three-phase AC motor. However, the configuration of motor 2 is not limited to this embodiment. Motor 2 may be an AC motor with N or more phases (where N is a natural number of 1 or more), or it may be a DC motor.

[0041] Motor 2 comprises a rotor 20 rotatable about a central axis J, and a stator 30 facing the rotor 20. In this embodiment, the stator 30 is located radially outside the rotor 20. The stator 30 surrounds the rotor 20 from the radial outside. Motor 2 in this embodiment is an inner rotor type motor. However, motor 2 may be an outer rotor type motor, an axial gap type motor, an induction motor without a rotor magnet, or a reluctance motor.

[0042] The rotor 20 rotates when alternating current is supplied from the control unit 7 to the stator 30. The rotor 20 has a shaft 21, a rotor core 24, and rotor magnets (not shown). The shaft 21 extends along the axial direction Y with a central axis J as its center. The shaft 21 is rotatably supported by bearings 26 and 27. The rotor core 24 is constructed, for example, by laminating silicon steel sheets. The rotor core 24 is a substantially cylindrical body extending along the axial direction Y. Multiple rotor magnets (not shown) are fixed to the rotor core 24. The multiple rotor magnets are arranged along the circumferential direction with their magnetic poles alternating.

[0043] The stator 30 is held in the housing 6. The stator 30 has a stator core 32 and a coil 31 mounted on the stator core 32. The stator core 32 is annular with a central axis J. The stator core 32 has an annular yoke and a plurality of magnetic pole teeth (not shown) extending radially inward from the inner circumferential surface of the yoke. The coil wire passes between the magnetic pole teeth. The coil wire passed between the magnetic pole teeth constitutes the coil 31.

[0044] The coil 31 has connection terminals 35. The connection terminals 35 extend radially outward from one axial end (+Y) of the coil 31 and are connected to the busbars 71 of the busbar unit 70, which will be described later. The coil 31 in this embodiment has three connection terminals 35 corresponding to the U phase, V phase, and W phase.

[0045] The connection terminal 35 comprises a terminal member 35a attached to the end of the coil wire and an insulating tube covering the outer circumference of the coil wire. In this embodiment, the terminal member 35a is a conductive material, such as a crimp terminal. The connection terminal 35 is connected to the busbar 71 of the busbar unit 70 via the terminal member 35a. In this embodiment, the portion of the coil wire constituting the connection terminal 35 has a portion extending axially in one direction (+Y) and a portion extending radially outward. However, the configuration of the connection terminal 35 is not limited to this embodiment; for example, the connection terminal 35 does not have an insulating tube, and the busbars connected to the coils of each phase may be used as the connection terminal 35.

[0046] The connection terminal 35 faces the motor cover 61 in the axial direction Y. The first region 61A of the motor cover 61 overlaps with the connection terminal 35 when viewed from the axial direction Y. Therefore, the recess 61d provided on the inner surface 61f of the motor cover 61 overlaps with the connection terminal 35 when viewed from the axial direction Y. The bottom surface of the recess 61d faces the connection terminal 35 in the axial direction Y. According to this embodiment, it is possible to secure a large gap between the motor cover 61 and the connection terminal 35 in the axial direction Y, making it easier to secure the insulation distance between the motor cover 61 and the connection terminal 35. Furthermore, in this embodiment, since the recess 61d is provided on the inner surface 61f, the distance between the motor cover 61 and the connection terminal 35 can be secured without reducing the plate thickness of the part of the motor cover 61 that overlaps with the connection terminal 35 (recess 61d). Therefore, it is possible to suppress the reduction in the rigidity of the motor cover 61 by locally thinning the motor cover 61.

[0047] Figure 2 is a front view of the motor cover 61 of this embodiment, viewed from one axial side (+Y). As shown in Figure 2, the boundary portion 61p, which is the boundary between the first region 61A and the second region 61B, is provided with a plurality of curved portions 61c. The plurality of curved portions 61c have a substantially arc-shaped curve that is convex radially inward when viewed from the axial direction Y. The motor cover 61 of this embodiment is provided with three curved portions 61c. When viewed from the axial direction Y, each curved portion 61c extends along the radially inward end of the connection terminal 35. According to this embodiment, when viewed from the axial direction Y, the first region 61A can be made smaller by making the boundary portion 61p conform to the outer shape of the connection terminal 35. As a result, when viewed from the axial direction Y, the area of ​​the convex portion 61e that protrudes to one side (+Y) in the motor cover 61 can be reduced, and the drive device 100 can be made smaller.

[0048] Figure 3 is an enlarged view of region III in Figure 2. As shown in Figure 3, the radially inner end 35b of at least one connection terminal 35 is positioned inside the curved portion 61c when viewed from the axial direction Y. This allows for a reduction in the area of ​​the protrusion 61e in the motor cover 61, thereby enabling miniaturization of the drive unit 100. In this specification, "positioned inside the curved portion 61c when viewed from the axial direction Y" means that the position is within the area enclosed by the imaginary line L connecting both ends 61ca of the curved portion 61c and the curved portion 61c when viewed from the axial direction Y.

[0049] <Department Head> The control unit 7 is electrically connected to the motor 2 via a busbar unit 70. The control unit 7 controls the motor 2. The control unit 7 functions, for example, as an inverter. In this case, the control unit 7 has a power board, capacitors, switching elements, etc., and converts a DC current supplied from a battery (not shown) into an AC current.

[0050] The control unit 7 may also have other electronic components. Examples of other electronic components include an on-board charger (OBC) and a DC / DC converter. The on-board charger is a device that converts an AC voltage supplied from an external source via a plug provided on the control unit 7 into a DC voltage and charges a battery (not shown). This battery (not shown) is a battery that supplies power to the drive unit 100. The DC / DC converter is a device that converts the voltage supplied from the battery (not shown) to the drive unit 100 and charges another low-voltage battery. The control unit 7 may have both an on-board charger and a DC / DC converter as electronic components that adjust the voltage, or it may have only one of them. The DC / DC converter provided as an electronic component may also be a device that boosts the voltage supplied from the battery (not shown) to the drive unit 100 and supplies it to other electronic components, etc.

[0051] <Bus bar unit> The busbar unit 70 is positioned across the control room 6C and the motor room 6A. That is, the busbar unit 70 is positioned in both the control room 6C and the motor room 6A. The busbar unit 70 is fixed to the housing body 64.

[0052] The busbar unit 70 includes a plurality of busbars 71 (three in this embodiment), a busbar holder 80 for holding the complex busbars 71, a plurality of fastening nuts (first fastening parts) 85 (two in this embodiment), a plurality of first fastening bolts (second fastening parts) 86 (two in this embodiment), and a second fastening bolt 86C. In this embodiment, the busbars 71 and fastening nuts 85 are enclosed in the busbar holder 80 by insert molding. In this specification, "enclosed" means that at least a part of it is embedded inside.

[0053] Each busbar 71 consists of a plate-shaped conductor (a conductive plate portion). In this embodiment, alternating currents with phases differing by 120° each flow through the three busbars 71, corresponding to the U phase, V phase, and W phase, respectively. Each of the multiple busbars 71 electrically connects the motor 2 and the control unit 7.

[0054] Figure 4 is a cross-sectional view of the busbar unit 70 and the control room 6C. At least a portion of the bus bar 71 passes through the through hole 65c in the partition wall 65. In this embodiment, each of the multiple bus bars 71 is arranged to span the motor room 6A and the control room 6C.

[0055] In this embodiment, the outer circumferential surface of the busbar unit 70 and the inner circumferential surface of the through hole 65c face each other with a gap G in between. That is, at least a portion of the outer circumferential surface of the busbar unit 70 is separated from the inner circumferential surface of the through hole 65c. In other words, the inner circumferential surface of the through hole 65c is located radially outward from at least a portion of the outer circumferential surface of the busbar unit 70. According to this embodiment, it is easy to ensure an insulating distance between the busbar 71 and the partition wall portion 65. Here, the outer circumferential surface of the busbar unit 70 refers to the surface of the busbar unit 70 that faces in a direction perpendicular to the axial direction Y. In this embodiment, the busbar unit 70 is arranged to be separated from the inner circumferential surface of the through hole 65c along its entire circumference. Therefore, an insulating distance between the busbar 71 and the partition wall portion 65 can be ensured along its entire circumference. Furthermore, since the through hole 65c can be opened sufficiently large relative to the busbar unit 70, the insertion of the busbar unit 70 into the through hole 65c by workers or equipment can be easily performed. As a result, the assembly process of the drive unit 100 can be easily carried out.

[0056] In this embodiment, the control chamber 6C and the motor chamber 6A are connected to each other via a gap G between the outer circumferential surface of the busbar unit 70 and the inner circumferential surface of the through hole 65c. That is, in the drive device 100 of this embodiment, the space between the motor chamber 6A and the control chamber 6C is not sealed. Therefore, the motor chamber 6A and the control chamber 6C are in communication with fluids that can flow between them. In the drive device 100 of this embodiment, the motor 2 is cooled by fluid flowing through a flow path 6F provided between the outer cylindrical portion 66a and the inner cylindrical portion 66b, so no liquid (oil, etc.) for cooling the motor 2 is stored in the motor chamber 6A. Therefore, there is no risk of liquid flowing from the motor chamber 6A into the control chamber 6C, and there is no need to provide a sealing structure in the gap G between the outer circumferential surface of the busbar unit 70 and the inner circumferential surface of the through hole 65c. This structure reduces the number of parts in the drive device 100.

[0057] Figure 5 is a front view of the busbar unit 70 and the motor room 6A. As shown in Figure 5, the through-hole 65c in this embodiment is positioned on one side of the motor 2 in the first direction (+Z) and on one side of the motor 2 in the second direction (-X). At least a portion of the through-hole 65c overlaps with the portion of the motor 2 on one side in the first direction (+Z) and in the second direction (X) when viewed from the axial direction Y. Also, at least a portion of the through-hole 65c overlaps with the portion of the motor 2 on one side in the second direction (-X) and in the first direction Z when viewed from the axial direction Y. Here, the portion of the motor 2 on one side in the first direction (+Z) when viewed from the axial direction Y means the region of the motor 2 that is on one side of the motor 2 in the first direction (+Z) from the central axis J. Similarly, the portion of the motor 2 on one side in the second direction (-X) when viewed from the axial direction Y means the region of the motor 2 that is on one side of the motor 2 in the second direction (-X) from the central axis J.

[0058] The end of the through-hole 65c in this embodiment has a first side 65ca and a second side 65cb that extend along the second direction X when viewed from the axial direction Y. The first side 65ca and the second side 65cb are arranged side by side in the first direction Z. In this embodiment, the first side 65ca is a side parallel to the second direction X. The second side 65cb is inclined toward one side of the first direction (+Z) as at least a portion of it moves toward the other side of the second direction (+X). Therefore, the dimension h1 in the first direction Z of the end of the through-hole 65c on the other side of the second direction (+X) is smaller than the dimension h2 in the first direction Z of the end of the through-hole 65c on one side of the second direction (-X).

[0059] According to this embodiment, when viewed from the axial direction Y, the second side 65cb is inclined, and the dimension h1 in the first direction Z at the end of the through hole 65c on the other side (+X) in the second direction is made smaller than the dimension h2 in the first direction Z at the end of the through hole 65c on the one side (-X) in the second direction. As a result, the through hole 65c can be positioned closer to the motor 2 in the first direction Z and the second direction X. This makes it possible to position the busbar 71 that passes through the through hole 65c closer to the motor 2. Consequently, the connection terminal 35 extending from the stator 30 to the busbar 71 can be shortened, and the electrical resistance of the connection terminal 35 can be reduced.

[0060] As shown in Figure 4, each of the busbars 71 has a first connecting portion 71a and a second connecting portion 71b that are exposed from the busbar holder 80, and a buried portion 71c that is contained within the busbar holder 80. The buried portion 71c connects the first connecting portion 71a and the second connecting portion 71b.

[0061] The first connection portion 71a is located at one end of the current path of the busbar 71, and the second connection portion 71b is located at the other end of the current path of the busbar 71. In this embodiment, the first connection portion 71a is located at the axial end (+Y) of the busbar 71. The first connection portion 71a is located in the motor chamber 6A. The second connection portion 71b is located at the other axial end (-Y) of the busbar 71. The second connection portion 71b is located in the control chamber 6C. The first connection portion 71a may be located between the motor chamber 6A and the control chamber 6C (i.e., inside the through hole 65c).

[0062] The first connection portion 71a is connected to the terminal member 35a of the connection terminal 35 of the stator 30. In this embodiment, the thickness direction of the first connection portion 71a coincides with the axial direction Y. The first connection portion 71a is provided with a through hole that penetrates in the thickness direction. A first nut 79A is positioned on the other axial side (-Y) of the first connection portion 71a. The first nut 79A is held by the busbar holder 80. A first connection bolt 78A is inserted into the first nut 79A. The first connection bolt 78A is tightened into the first nut 79A through the through hole in the terminal member 35a and the through hole in the first connection portion 71a. As a result, the first connection portion 71a and the terminal member 35a are fixed to each other and electrically connected. The first connection portion 71a is also electrically connected to the stator 30. In this embodiment, the connection terminal 35 extending from the motor 2 is fastened to the busbar 71 from one axial side (+Y).

[0063] The second connection portion 71b is connected to the control unit 7. In this embodiment, the thickness direction of the second connection portion 71b coincides with the first direction Z. The second connection portion 71b is provided with a through hole that penetrates in the thickness direction. A second nut 79B is positioned on the other side (-Z) of the second connection portion 71b in the first direction. The second nut 79B is held by the busbar holder 80. A second connecting bolt 78B is inserted into the second nut 79B. The second connecting bolt 78B is tightened into the second nut 79B through the through hole of the connecting terminal 7a extending from the control unit 7 and the through hole of the second connection portion 71b. As a result, the second connection portion 71b and the connecting terminal 7a of the control unit 7 are fixed to each other and electrically connected. In this embodiment, the connecting terminal 7a of the control unit 7 is fastened to the second connection portion 71b from the opening side (+Z) of the box-shaped portion 68.

[0064] The buried portion 71c is the part of the busbar 71 that is located inside the busbar holder 80. The busbar 71 is bent in the buried portion 71c. A part of the buried portion 71c is exposed from the busbar holder 80 in the first window portion 81a or the second window portion 81b, which will be described later.

[0065] The busbar holder 80 holds the embedded portions 71c of multiple busbars 71. In this embodiment, the busbar holder 80 holds multiple busbars 71 by encompassing them. However, the busbar holder 80 does not necessarily have to encompass multiple busbars 71 as long as it can hold multiple busbars 71.

[0066] The busbar holder 80 has a holding portion 81, a plurality of protruding portions 83, a first terminal support portion 87, a second terminal support portion 84, and a fixing portion 89. The holding portion 81 holds the embedded portion 71c. In this embodiment, the holding portion 81 is block-shaped.

[0067] The holding portion 81 encompasses and holds a plurality of busbars 71. The holding portion 81 is provided with a first window portion 81a and a second window portion 81b. That is, the busbar holder 80 has a first window portion 81a and a second window portion 81b. The first window portion 81a and the second window portion 81b are located in the control room 6C.

[0068] The first window 81a exposes at least one of the multiple busbars 71 to one side in the first direction (+Z). The second window 81b exposes at least one of the multiple busbars 71 to the other side in the first direction (-Z). In the control room 6C of this embodiment, the first direction Z is one of the directions along the radial direction. That is, the first window 81a exposes at least one of the multiple busbars 71 radially outward. The second window 81b exposes at least one of the multiple busbars 71 radially inward.

[0069] In this embodiment, the multiple busbars 71 contained within the holding portion 81 are arranged radially. In this embodiment, the first window portion 81a exposes the busbar 71 located furthest radially outward from the multiple busbars 71. The second window portion 81b exposes the busbar 71 located furthest radially inward from the multiple busbars 71. However, the first window portion 81a may expose multiple busbars 71 radially outward. Similarly, the second window portion 81b may expose multiple busbars 71 radially inward. Furthermore, the holding portion 81 may be provided with multiple first window portions 81a and multiple second window portions 81b.

[0070] The bottom wall portion 68a of the housing 6 is provided with a recessed portion 68b that is recessed in the other side (-Z) in the first direction. The recessed portion 68b overlaps with the second window portion 81b when viewed from the first direction Z. With this structure, the distance in the first direction Z between the bus bar 71 exposed from the second window portion 81b and the bottom of the recessed portion 68b can be made longer than the distance in the first direction Z between the portion of the buried portion 71c on the other side (-Z) in the first direction where the bus bar 71 is not exposed and the bottom wall portion 68a. In other words, the bus bar exposed from the second window portion 81b and the inner surface of the recessed portion 68b (the surface of the bottom wall portion 68a on one side (+Z) in the first direction) can be positioned apart. This ensures sufficient insulation distance between the bus bar 71 exposed from the second window portion 81b and the housing 6.

[0071] In this embodiment, the opening area of ​​the first window portion 81a is larger than the opening area of ​​the second window portion 81b. The busbar unit 70 in this embodiment is supported by the bottom wall portion 68a from the radially inward side. Therefore, it is more difficult to secure a distance from the housing on the radially inward-facing surface of the busbar 71 than on the radially outward-facing surface. That is, in the first direction Z, the distance between the radially inward-facing surface of the busbar 71 and the bottom wall portion 68a tends to be shorter than the distance between the radially outward-facing surface of the busbar 71 and the bottom wall portion 68a. Therefore, when the radially inward-facing surface of the busbar 71 is exposed, it is difficult to secure an insulating distance unless the distance between the radially inward-facing surface of the busbar 71 and the bottom wall portion 68a is increased by providing a concave portion 68b in the bottom wall portion 68a, for example. However, since at least a portion of the bottom wall 68a radially separates the control chamber 6C and the motor chamber 6A, the area in which a concave portion 68b can be provided in the bottom wall 68a may be limited. Therefore, in this embodiment, the opening area of ​​the first window 81a that exposes the radially outward-facing surface of the busbar 71 is larger than the opening area of ​​the second window 81b that exposes the radially inward-facing surface of the busbar 71. This makes it possible to increase the exposed area of ​​the busbar 71 while ensuring an insulating distance between the busbar 71 and the bottom wall 68a, thereby reducing the weight of the busbar unit 70.

[0072] In this specification, when multiple first window sections 81a are provided, "opening area of ​​the first window section 81a" means the sum of the opening areas of all the first window sections 81a. Similarly, when multiple second window sections 81b are provided, "opening area of ​​the second window section 81b" means the sum of the opening areas of all the second window sections 81b.

[0073] The protruding portion 83 projects from the outer circumferential surface of the holding portion 81 in a direction perpendicular to the axial direction Y. The protruding portion 83 is positioned in the control chamber 6C. The protruding portion 83 extends along the first surface 65a of the partition wall portion 65. The protruding portion 83 has a positioning surface 80a facing one side (+Y) in the axial direction. That is, the busbar holder 80 has a positioning surface 80a. The positioning surface 80a contacts the first surface 65a of the partition wall portion 65. The busbar unit 70 is fixed to the housing 6 with the positioning surface 80a in contact with the first surface 65a. As a result, the busbar unit 70 is positioned in the axial direction Y relative to the housing 6.

[0074] Figure 6 is a perspective view of the busbar unit 70 and the control room 6C. As shown in Figure 6, the busbar holder 80 of the present invention has protrusions 83, namely a first protrusion 83A, a second protrusion 83B, and a third protrusion 83C. The first protrusion 83A, the second protrusion 83B, and the third protrusion 83C are each provided with the positioning surface 80a described above.

[0075] The first protrusion 83A, the second protrusion 83B, and the third protrusion 83C are provided at the axial end (+Y) of the busbar holder 80 and are located on the other axial side (-Y) of the partition wall 65. In this embodiment, the first protrusion 83A, the second protrusion 83B, and the third protrusion 83C protrude in mutually different directions perpendicular to the axial direction Y. The first protrusion 83A protrudes to the other side (+X) in the second direction. The second protrusion 83B protrudes to the other side (-Z) in the first direction. The third protrusion 83C protrudes to one side (-X) in the second direction.

[0076] The first protrusion 83A and the second protrusion 83B each contain fastening nuts 85. That is, the busbar unit 70 contains two fastening nuts 85. In addition, the first protrusion 83A and the third protrusion 83C each have a convex portion (second fitting portion) 82. That is, the busbar unit 70 has two convex portions 82. The convex portions 82 protrude from the positioning surface 80a in one axial direction (+Y).

[0077] The protrusions 82 are provided on the positioning surfaces 80a of the first protrusion 83A and the third protrusion 83C. In this embodiment, the protrusions 82 are substantially cylindrical in shape and extend in the axial direction Y. The diameter of the protrusions 82 is slightly smaller than the diameter of the positioning holes 65h of the partition wall 65. The two protrusions 82 are each inserted into different positioning holes 65h. More specifically, the protrusion 82 of the first protrusion 83A is inserted into the positioning hole 65h located on the other side (+X) of the through hole 65c in the second direction. The protrusion 82 of the third protrusion 83C is inserted into the positioning hole 65h located on the one side (-X) of the through hole 65c in the second direction. According to this embodiment, by inserting the multiple protrusions 82 into the positioning holes 65h, the busbar unit 70 can be positioned in the housing 6 in a plane perpendicular to the axial direction Y.

[0078] In this embodiment, the case described is one in which a positioning hole 65h as a first fitting portion is provided in the partition wall portion 65 and a protrusion 82 as a second fitting portion is provided in the positioning surface 80a of the busbar unit. However, the protrusion 82 may be provided in the partition wall portion 65 and the positioning hole 65h may be provided in the positioning surface 80a. That is, one of the first fitting portion of the partition wall portion 65 and the second fitting portion of the positioning surface 80a may be a protrusion 82 that protrudes in the axial direction, and the other may be a recess (positioning hole 65h) into which the protrusion 82 is inserted.

[0079] Two fastening nuts 85 are fixed to the first projection 83A and the second projection 83B of the busbar holder 80, respectively, with the direction in which the screw holes extend being the axial direction Y. When the busbar holder 80 is positioned on the partition wall 65, the screw holes of the fastening nuts 85 align with the fixing holes 65d of the partition wall 65. The first fastening bolt 86 is fastened to the fastening nuts 85.

[0080] As shown in Figure 1, the first fastening bolt 86 has a shaft portion 86d extending in the axial direction Y, and a head portion 86b connected to one end of the shaft portion 86d on the axial side (+Y). The head portion 86b has a fastening surface 86f that serves as a seating surface facing the other axial side (-Y).

[0081] The shaft portion 86d of the first fastening bolt 86 is inserted into the fixing hole 65d from one axial side (+Y) and tightened into the fastening nut 85. That is, the fastening nut 85 and the first fastening bolt 86 are fastened to each other with the partition wall portion 65 in between. The diameter of the fastening nut 85 and the diameter of the head 86b are larger than the diameter of the fixing hole 65d. Therefore, the fastening nut 85 contacts the first surface 65a of the partition wall portion 65. Also, the fastening surface 86f of the head 86b contacts the second surface 65b of the partition wall portion 65. As a result, the busbar unit 70 is fixed to the partition wall portion 65. Note that the fastening surface 86f and the second surface 65b may be indirectly in contact via another component such as a washer.

[0082] According to this embodiment, the busbar unit 70 is positioned and fixed to the partition wall 65 on the first surface 65a and the second surface 65b, which face opposite the partition wall 65. Therefore, the busbar unit 70 is positioned on one side of the partition wall 65 and fastened on the other side. According to this embodiment, the busbar unit 70 is inserted into the through hole 65c from the space on the positioning side (control room 6C in this embodiment) and assembled to the partition wall 65. Therefore, even if a member (for example, a connection terminal 35) that overlaps the through hole 65c in the axial direction Y is arranged in the space on the fastening side (motor room 6A in this embodiment), the busbar unit 70 can be smoothly assembled to the partition wall 65. Note that the space on the fastening side may be the control room 6C side, and the space on the positioning side may be the motor room side A. That is, fastening may be performed on the first surface 65a side and positioning may be performed on the second surface 65b side. In other words, one of the first surface 65a and the second surface 65b must face the control room 6C, and the other of the first surface 65a and the second surface 65b must face the motor room 6A.

[0083] In this embodiment, the first surface 65a, which the positioning surface 80a contacts, faces the control room 6C, and the second surface 65b, which the fastening surface 86f of the first fastening bolt 86 contacts, faces the motor room 6A. Therefore, the busbar unit 70 is positioned in the control room 6C and fixed in the motor room 6A.

[0084] According to this embodiment, even if the stator 30 is assembled before the busbar unit 70 is assembled to the housing 6, the through hole 65c and the connecting terminal 35 which overlaps in the axial direction Y can prevent the assembly work of the busbar unit 70 from becoming complicated by the worker. This makes the assembly process of the busbar unit 70 to the housing 6 easier.

[0085] Furthermore, according to this embodiment, the busbar unit 70 can be fastened to the partition wall 65 with the motor cover 61 removed and the motor chamber 6A exposed in the axial direction Y. This makes the fastening work easier compared to when workers perform the fastening work in the relatively enclosed space of the control chamber 6C. In addition, according to this embodiment, the fastening of the busbar unit 70 to the partition wall 65 and the connection of the busbar 71 to the connection terminal 35 can be performed from the same direction (one side in the axial direction (+Y)). This makes it possible to perform these processes continuously, enabling smooth assembly.

[0086] In this embodiment, the case described is where the first fastening part fixed to the busbar holder 80 is a fastening nut 85, and the second fastening part having a fastening surface 86f is a first fastening bolt 86. However, the first fastening part may be a bolt and the second fastening part may be a nut. In this case, the shaft of the bolt, which serves as the first fastening part fixed to the busbar holder 80, is passed through the fixing hole 65d, and the nut, which serves as the second fastening part, is fastened to the shaft from one axial side (+Y).

[0087] As shown in Figure 5, the two positioning holes 65h and the two fixing holes 65d are arranged around the through hole 65c when viewed from the axial direction Y. In the following description, one of the two positioning holes 65h will be referred to as the first positioning hole (first fitting portion) 65ha, and the other as the second positioning hole (first fitting portion) 65hb. Also, one of the two fixing holes 65d will be referred to as the first fixing hole 65da, and the other as the second fixing hole 65db.

[0088] Furthermore, in this embodiment, in the second direction X, the first positioning hole 65ha and the second positioning hole 65hb are located on opposite sides of the through hole 65c. According to this embodiment, by inserting the two protrusions 82 into the first positioning hole 65ha and the second positioning hole 65hb, respectively, the busbar unit 70 can be positioned on both sides of the through hole 65c in the second direction X. This allows the two positioning parts to be positioned sufficiently far apart in the second direction X, thereby improving the positioning accuracy of the busbar unit 70.

[0089] According to this embodiment, the shortest distance between the first positioning hole 65ha and the through hole 65c is longer than the shortest distance between the first fixing hole 65da and the through hole 65c. If the positioning hole 65h is too close to the through hole 65c, it becomes difficult for workers to identify the positioning hole 65h when positioning the busbar unit 70. As a result, it becomes difficult to insert the protrusion 82 into the positioning hole 65h. According to this embodiment, by positioning the first positioning hole 65ha further away from the through hole 65c than the first fixing hole 65da, it becomes easy to insert the protrusion 82 into the first positioning hole 65ha.

[0090] According to this embodiment, the shortest distance between the first positioning hole 65ha and the motor 2 is longer than the shortest distance between the first fixing hole 65da and the motor 2. If the positioning hole 65h is too close to the motor 2, it becomes difficult for workers to identify the positioning hole 65h when inserting the busbar unit 70 into the through hole 65c. According to this embodiment, by positioning the second positioning hole 65hb further away from the motor 2 than the second fixing hole 65db, workers can easily insert the protrusion 82 into the second positioning hole 65hb.

[0091] The first terminal support portion 87 is located in the expanded space 6D of the motor chamber 6A. The first terminal support portion 87 supports the first connection portions 71a of the multiple busbars 71. In this embodiment, the first terminal support portion 87 supports three first connection portions 71a. The three first connection portions 71a in this embodiment are arranged in a line in the second direction X.

[0092] As shown in Figure 4, the first terminal support portion 87 supports the first connection portion 71a from the other axial side (-Y). The first terminal support portion 87 also holds the first nut 79A.

[0093] As shown in Figure 5, the first terminal support portion 87 has a first holder surface 87a, a second holder surface 87b, a plurality (2) of first ribs 88a, a plurality (2) of second ribs 88b, and a third rib 88c. That is, the busbar holder 80 has a first holder surface 87a, a second holder surface 87b, a first rib 88a, a second rib 88b, and a third rib 88c.

[0094] The first holder surface 87a is the surface facing one axial direction (+Y) in the motor chamber 6A. The second holder surface 87b is the surface facing radially inward in the motor chamber 6A. In this embodiment, the second holder surface 87b is the surface facing the other side of the first direction (-Z). The second holder surface 87b is connected to the end of the first holder surface 87a on the other side of the first direction (-Z).

[0095] Figure 7 is a perspective view of the busbar unit 70 and the motor room 6A. As shown in Figure 7, the first rib 88a and the third rib 88c are provided on the first holder surface 87a. The first rib 88a and the third rib 88c protrude from the first holder surface 87a in one axial direction (+Y).

[0096] The first rib 88a extends along the first direction Z and the second direction X. The first rib 88a is located between adjacent first connection portions 71a. This allows for a longer creepage distance between adjacent first connection portions 71a compared to a structure without the first rib 88a. In other words, by providing the first rib 88a, an insulating distance between the first connection portions 71a can be ensured.

[0097] The third rib 88c surrounds the multiple first connection portions 71a. The third rib 88c is located between the multiple first connection portions 71a and the inner surface of the outer cylindrical portion 66a. This allows for a longer insulation distance between the first connection portions 71a and the inner surface of the outer cylindrical portion 66a compared to a structure without the third rib 88c.

[0098] The second rib 88b is provided on the second holder surface 87b. The second rib 88b protrudes radially inward from the second holder surface 87b. The second rib 88b, which extends along the axial direction Y, is connected to the first rib 88a. That is, one axial end (+Y) of the second rib 88b is connected to the radially inward end of the first rib 88a. The second rib 88b is located between a plurality of connection terminals 35.

[0099] In this embodiment, a connection terminal 35 extending radially outward from the stator 30 is connected to the first connection portion 71a. That is, the connection terminal 35 extends radially inward from the first connection portion 71a. Therefore, the creepage distance between the connection terminals 35 tends to be short on the second holder surface 87b, which is the radially inward-facing surface of the first terminal support portion 87. According to this embodiment, a second rib 88b provided on the second holder surface 87b is positioned between the connection terminals 35. This makes it possible to increase the insulation distance between the connection terminals 35 on the second holder surface 87b.

[0100] As shown in Figure 6, the second terminal support 84 is located in the control room 6C. The second terminal support 84 supports the second connection portions 71b of the multiple busbars 71. In this embodiment, the second terminal support 84 supports three second connection portions 71b.

[0101] The second terminal support section 84 includes a plurality (3) of terminal blocks 84a, 84b, and 84c, a plurality (2) of fourth ribs 84e, and a fifth rib 84g.

[0102] The multiple terminal blocks 84a, 84b, and 84c include a first terminal block 84a, a second terminal block 84b, and a third terminal block 84c. Each of the first terminal block 84a, the second terminal block 84b, and the third terminal block 84c supports one second connection 71b.

[0103] The three second connection portions 71b of this embodiment are arranged in a line in one direction. In the following description, the direction in which the multiple second connection portions 71b are arranged is referred to as the arrangement direction Y. In this embodiment, the arrangement direction Y is parallel to the axial direction Y. The first terminal block 84a, the second terminal block 84b, and the third terminal block 84c are arranged in a line in the arrangement direction Y. The second terminal block 84b is located on one side of the arrangement direction Y (the other side in the axial direction (-Y)) relative to the first terminal block 84a. The third terminal block 84c is located on one side of the arrangement direction Y (the other side in the axial direction (-Y)) relative to the second terminal block 84b.

[0104] The fourth rib 84e and the fifth rib 84g protrude in the same direction (+Z) from the surface of the second terminal support portion 84 facing the first direction (+Z).

[0105] The fourth rib 84e extends along a direction perpendicular to the arrangement direction Y. The fourth rib 84e is located between the second connecting portions 71b. This ensures a greater insulation distance between the second connecting portions 71b compared to a structure without the fourth rib 84e.

[0106] The fifth rib 84g surrounds the multiple second connection portions 71b. The fifth rib 84g is located between the multiple second connection portions 71b and the inner surface of the box-shaped portion 68. This allows for a longer insulation distance between the second connection portions 71b and the inner surface of the box-shaped portion 68 compared to a structure without the fifth rib 84g.

[0107] As shown in Figure 4, the multiple terminal blocks 84a, 84b, and 84c each support the second connection portion 71b from the other side (-Z) in the first direction. In addition, the multiple second terminal support portions 84 each hold the second nut 79B.

[0108] Multiple terminal blocks 84a, 84b, and 84c are provided with multiple recesses 84d that are recessed in a direction perpendicular to the arrangement direction Y. This allows the busbar holder 80 to be made lighter by providing recesses 84d in the busbar holder 80.

[0109] Each of the terminal blocks 84a, 84b, and 84c in this embodiment is provided with three recesses 84d. The three recesses 84d are arranged in the arrangement direction Y. A second nut 79B is placed in the middle of the three recesses 84d in the arrangement direction Y.

[0110] In this embodiment, among the multiple recesses 84d of the first terminal block 84a, the dimension in the direction of Y of the recess 84d located furthest to one side in the direction of Y is larger than the dimension in the direction of Y of the other recesses 84d. As described above, among the multiple recesses 84d of the first terminal block 84a, the second nut 79B is supported in the central recess 84d. Therefore, the second connection portion 71b is connected to the connection terminal 7a directly above the central recess 84d. According to this embodiment, among the multiple recesses 84d, the dimension in the direction of Y of the recess 84d located furthest towards the second terminal block 84b is larger than the dimension in the direction of Y of the other recesses 84d. This makes it possible to position the second connection portion 71b supported by the first terminal block 84a at a distance from the second connection portion 71b supported by the second terminal block 84b. This makes it easier to ensure sufficient insulation distance between the second connection portion 71b supported by the first terminal block 84a and the second connection portion 71b supported by the second terminal block 84b.

[0111] The relationship regarding the dimensions of the recesses 84d between the first terminal block 84a and the second terminal block 84b in this embodiment also applies to the relationship between the second terminal block 84b and the third terminal block 84c. That is, in this embodiment, among the multiple recesses 84d of the second terminal block 84b, the dimension in the arrangement direction Y of the recess 84d located closest to the third terminal block 84c is larger than the dimension in the arrangement direction Y of the other recesses 84d. This makes it easier to ensure insulation between the second connection part 71b supported by the second terminal block 84b and the second connection part 71b supported by the third terminal block 84c.

[0112] As shown in Figure 6, the fixing portion 89 is provided at the other axial end (-Y) of the busbar holder 80. The fixing portion 89 is plate-shaped and extends along a plane perpendicular to the first direction Z. The fixing portion 89 is provided with a through hole that penetrates in the first direction Z and through which the second fastening bolt 86C is passed. The fixing portion 89 is fixed to the bottom wall portion 68a of the box-shaped portion 68 by the second fastening bolt 86C. The busbar unit 70 is fixed to the partition wall portion 65 by fastening nuts 85 and the first fastening bolt 86, and then fixed to the bottom wall portion 68a at the fixing portion 89. This prevents the busbar unit 70 from moving in the axial direction Y and the second direction X.

[0113] [Second Embodiment] Figure 8 is a schematic diagram showing how the busbar unit 170 is fixed to the partition wall portion 165 in the drive unit 200 of the second embodiment. In this embodiment, the relationship between the first and second surfaces of the partition wall portion 165 differs from that of the embodiment described above.

[0114] Similar to the embodiments described above, the housing 106 of this embodiment has a partition wall portion 165 that separates the motor room 6A and the control room 6C. The partition wall portion 165 has a first surface 165a and a second surface 165b that face opposite each other in the axial direction Y.

[0115] In the partition wall portion 165 of this embodiment, the first surface 165a, which the positioning surface 180a contacts, faces the motor room 6A side. The second surface 165b, which the fastening surface 86f of the first fastening bolt 86 contacts, faces the control room 6C side. Therefore, the busbar unit 170 of this embodiment is positioned on the first surface 165a facing the motor room 6A side and fixed to the partition wall portion 165 from the control room 6C side. Even when the first surface 165a and the second surface 165b are in this relationship, the workability of the assembly process can be improved depending on the structure of the housing 106.

[0116] Although various embodiments and modifications of the present invention have been described above, the configurations and combinations thereof in each embodiment and its modifications are merely examples, and additions, omissions, substitutions, and other modifications are possible without departing from the spirit of the present invention. Furthermore, the present invention is not limited by its embodiments.

[0117] For example, in the embodiments described above, the arrangement and orientation of the parts represented by the first direction and the second direction, and one side and the other side thereof, are examples and may be reversed from those described in the embodiments.

[0118] Furthermore, this technology can be configured as follows: [1] A motor having a rotor that can rotate about a central axis and a stator facing the rotor, A control unit for controlling the motor, A busbar unit having a plurality of busbars that electrically connect the motor and the control unit, The device comprises a housing that accommodates the motor, the control unit, and the busbar unit within its internal space, The aforementioned housing is The control room where the control unit is located, A motor room in which the motor is located, It has a partition wall that separates the control room and the motor room, The partition wall extends along a plane that intersects the axial direction of the central axis, The partition wall portion is, Page 1 and, Page 2, A through hole that penetrates the partition wall portion in the axial direction, The partition wall portion has a fixing hole that penetrates axially, Of the first and second surfaces, one faces the control room side. Of the first and second surfaces, the other faces the motor chamber side. At least a portion of the busbar is passed through the through hole, The aforementioned busbar unit is A busbar holder that supports the plurality of busbars and has a positioning surface that contacts the first surface, A first fastening portion fixed to the busbar holder, It has a second fastening part that is fastened to the first fastening part, The first fastening portion and the second fastening portion are fastened to each other via the fixing hole, The second fastening portion is a rotating electric machine having a fastening surface that contacts the second surface. [2] The first surface faces the control room side, The second surface faces the motor room side, The housing comprises a housing body and a motor cover. The housing body is, The partition wall portion, The motor has a cylindrical wall portion that surrounds it from the radially outer side, The motor cover covers the motor and the second surface from an axial direction, as described in [1]. [3] The rotating electric machine according to [1] or [2], wherein the outer circumferential surface of the busbar unit and the inner circumferential surface of the through hole face each other with a gap in between. [4] The rotating electric machine as described in [3], wherein the control room and the motor room are connected to each other through the gap. [5] Two directions that are perpendicular to the axial direction and mutually perpendicular are defined as the first and second directions, At least a portion of the through hole overlaps, when viewed from the axial direction, with the portion of the motor on one side in the first direction and the portion in the second direction. At least a portion of the through hole overlaps with the portion of the motor on one side in the second direction in the first direction. The rotating electric machine according to [2], wherein the dimension in the first direction of the other end of the through hole in the second direction is smaller than the dimension in the first direction of the one end of the through hole in the second direction. [6] The stator is fixed to the inner circumferential surface of the cylindrical wall portion by press-fitting, as described in [2] or [5]. [7] The partition wall portion has a first fitting portion, The positioning surface has a second fitting portion, The rotating electric machine according to [2], [5], or [6], wherein one of the first fitting portion and the second fitting portion is a convex portion that protrudes in the axial direction, and the other is a recess into which the convex portion is inserted. [8] The rotating electric machine according to [7], wherein the shortest distance between the first fitting portion and the through hole is longer than the shortest distance between the fixing hole and the through hole. [9] The rotating electric machine according to [7] or [8], wherein the shortest distance between the first fitting portion and the motor is longer than the shortest distance between the fixing hole and the motor.

[10] Each of the plurality of busbars has a first connection portion that is connected to the connection terminal of the stator, The aforementioned busbar holder is In the motor chamber, the first holder surface facing axial direction, The motor chamber has a second holder surface facing radially inward, The first holder surface is provided with a first rib located between the plurality of first connecting portions, The rotating electric machine according to any one of [2], [5] to [9], wherein the second holder surface is provided with a second rib located between the plurality of connection terminals and connected to the first rib.

[11] The control room is located radially outward from the motor, The housing has a wall portion that supports the busbar unit from the radially inward direction. The busbar holder includes the plurality of busbars, The aforementioned busbar holder is A first window portion that exposes at least one of the plurality of busbars radially outward, It has a second window portion that exposes at least one of the plurality of busbars radially inward, The first window section and the second window section are located in the control room. A rotating electric machine according to any one of [2], [5] to

[10] , wherein the opening area of ​​the first window is larger than the opening area of ​​the second window.

[12] The stator has a connection terminal that extends radially outward from one end on the axial side and is connected to the bus bar, The motor cover is A first region that overlaps with the connection terminal when viewed from the axial direction, It has a second region connected to the radially inward side of the first region, The first region is located on one axial side of the second region. The boundary between the first region and the second region has a curved portion that is convex radially inward when viewed from the axial direction. The curved portion extends along the radially inward end of the connection terminal, the rotating electric machine according to any one of [2], [5] to

[11] .

[13] The rotating electric machine according to

[12] , wherein the radially inner end of the connecting terminal is positioned inside the curved portion when viewed from the axial direction.

[14] Each of the plurality of busbars has a second connection part connected to the control unit, The plurality of second connecting parts are arranged in a line in one direction, The busbar holder has a plurality of terminal blocks that each support the second connection portion, Each of the aforementioned terminal blocks is provided with a plurality of recesses that are recessed in a direction perpendicular to the aforementioned one direction. The plurality of terminal blocks include a first terminal block and a second terminal block located on one side of the first terminal block in the same direction. The rotating electric machine according to any one of [1] to

[13] , wherein the dimension in one direction of the recess located furthest to one side of the plurality of recesses of the first terminal block is larger than the dimension in one direction of the other recesses.

[15] A rotating electric machine as described in any one of items [1] to

[14] , A drive device comprising a power transmission unit for transmitting power to the aforementioned rotating electric machine. [Explanation of Symbols]

[0119] 2...Motor, 3...Power transmission section, 6, 106...Housing, 6A...Motor room, 6C...Control room, 7...Control unit, 7a, 35...Connection terminals, 10...Rotating electric machine, 20...Rotor, 30...Stator, 35b...End section, 61...Motor cover, 61c...Bent section, 61d, 84d...Recess, 61e, 82...Convex section, 61p...Boundary section, 61A...First area, 61B...Second area, 64...Housing body, 65, 165...Partition wall section, 65a, 165a...First surface, 65b, 165b...Second surface, 65c...Through hole, 65d...Fixing hole, 65h...Positioning hole (first fitting section), 66...Cylindrical wall section, 68a...Bottom wall section (wall section), 70, 170...Ba Busbar unit, 71...busbar, 71a...first connection part, 71b...second connection part, 80...busbar holder, 80a, 180a...positioning surface, 81a...first window part, 81b...second window part, 82...protrusion (second fitting part), 84a...first terminal block, 84a...terminal block, 84b...second terminal block, 85...fastening nut (first fastening part), 86...first fastening bolt (second fastening part), 86f...fastening surface, 86f...fastening surface, 87a...first holder surface, 87b...second holder surface, 88a...first rib, 88b...second rib, 100, 200...drive device, G...gap, h1, h2...dimensions, J...center axis, X...second direction, Y...axial direction, Z...first direction

Claims

1. A motor having a rotor that can rotate about a central axis, and a stator facing the rotor, A control unit for controlling the motor, A busbar unit having a plurality of busbars that electrically connect the motor and the control unit, The device comprises a housing that accommodates the motor, the control unit, and the busbar unit within its internal space, The aforementioned housing is The control room where the control unit is located, A motor room in which the motor is located, It has a partition wall that separates the control room and the motor room, The partition wall extends along a plane that intersects the axial direction of the central axis, The partition wall portion is, Page 1 and, Page 2, A through hole that penetrates the partition wall portion in the axial direction, The partition wall portion has a fixing hole that penetrates axially, Of the first and second surfaces, one faces the control room side. Of the first and second surfaces, the other faces the motor room side. At least a portion of the busbar is passed through the through hole, The aforementioned busbar unit is A busbar holder that supports the plurality of busbars and has a positioning surface that contacts the first surface, A first fastening portion fixed to the busbar holder, It has a second fastening part that is fastened to the first fastening part, The first fastening portion and the second fastening portion are fastened to each other via the fixing hole, The second fastening portion has a fastening surface that contacts the second surface, Rotating electric machine.

2. The first surface faces the control room side, The second surface faces the motor room side, The housing comprises a housing body and a motor cover. The housing body is, The partition wall portion, The motor has a cylindrical wall portion that surrounds it from the radially outer side, The motor cover covers the motor and the second surface from the axial direction. The rotating electric machine according to claim 1.

3. The outer circumferential surface of the busbar unit and the inner circumferential surface of the through hole face each other with a gap in between. The rotating electric machine according to claim 1.

4. The control room and the motor room are connected to each other through the gap. The rotating electric machine according to claim 3.

5. Two directions that are perpendicular to the axial direction and mutually perpendicular are defined as the first and second directions. At least a portion of the through hole overlaps, when viewed from the axial direction, with the portion of the motor on one side in the first direction and the portion in the second direction. At least a portion of the through hole overlaps with the portion of the motor on one side in the second direction in the first direction. The dimension of the other end of the through hole in the second direction in the first direction is smaller than the dimension of the one end of the through hole in the second direction in the first direction. The rotating electric machine according to claim 2.

6. The stator is fixed to the inner circumferential surface of the cylindrical wall portion by press-fitting. The rotating electric machine according to claim 2.

7. The partition wall portion has a first fitting portion, The positioning surface has a second fitting portion, Of the first fitting portion and the second fitting portion, one is a protrusion that protrudes in the axial direction, and the other is a recess into which the protrusion is inserted. The rotating electric machine according to claim 2.

8. The shortest distance between the first fitting portion and the through hole is longer than the shortest distance between the fixing hole and the through hole. The rotating electric machine according to claim 7.

9. The shortest distance between the first fitting portion and the motor is longer than the shortest distance between the fixing hole and the motor. The rotating electric machine according to claim 7.

10. Each of the aforementioned busbars has a first connection portion that is connected to the connection terminal of the stator, The aforementioned busbar holder is In the motor chamber, the first holder surface facing axial direction, The motor chamber has a second holder surface facing radially inward, The first holder surface is provided with a first rib located between the plurality of first connecting portions, The second holder surface is provided with a second rib located between the plurality of connection terminals and connected to the first rib. The rotating electric machine according to claim 2.

11. The control room is located radially outward from the motor, The housing has a wall portion that supports the busbar unit from the radially inward direction. The busbar holder includes the plurality of busbars, The aforementioned busbar holder is A first window portion that exposes at least one of the plurality of busbars radially outward, It has a second window portion that exposes at least one of the plurality of busbars radially inward, The first window section and the second window section are located in the control room. The opening area of ​​the first window is larger than the opening area of ​​the second window. The rotating electric machine according to claim 2.

12. The stator has a connection terminal that extends radially outward from one end on the axial side and is connected to the busbar. The motor cover is A first region that overlaps with the connection terminal when viewed from the axial direction, It has a second region connected to the radially inward side of the first region, The first region is located on one axial side of the second region. The boundary between the first region and the second region has a curved portion that is convex radially inward when viewed from the axial direction. The curved portion extends along the radially inward end of the connection terminal. The rotating electric machine according to claim 2.

13. The radially inner end of the aforementioned connection terminal is positioned inside the curved portion when viewed from the axial direction. The rotating electric machine according to claim 12.

14. Each of the aforementioned busbars has a second connection portion connected to the control unit, The plurality of second connecting parts are arranged in a line in one direction. The busbar holder has a plurality of terminal blocks that each support the second connection portion, Each of the aforementioned terminal blocks is provided with a plurality of recesses that are recessed in a direction perpendicular to the aforementioned one direction. The plurality of terminal blocks include a first terminal block and a second terminal block located on one side of the first terminal block in the one direction, Of the plurality of recesses in the first terminal block, the dimension in that direction of the recess located furthest to one side in that direction is larger than the dimension in that direction of the other recesses. The rotating electric machine according to claim 1.

15. A rotating electric machine according to any one of claims 1 to 14, The system includes a power transmission unit that transmits power to the aforementioned rotating electric machine, Drive unit.

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