WO2024009372A1 - Motor unit - Google Patents

Abstract

A motor unit comprising a dynamo-electric machine, a motor case, an inverter, an inverter case, a plate-shaped motor bus bar connected to the dynamo-electric machine at one end, a plate-shaped inverter bus bar connected to the inverter at one end, and a terminal block to which the motor bus bar and inverter bus bar are fixed with a bolt and a nut, the motor case and inverter case being integrated into a single unit, wherein the nut is held on the terminal block so as to be movable in the axial direction of the bolt, and the bolt penetrates through a through-hole in each of the motor bus bar and the inverter bus bar and is fastened to the nut. The motor unit further comprises a cover member formed from an insulating member, the cover member being equipped with a lid that is fixed to the motor case and a protrusion that protrudes from the lid to the inside of the motor case and presses the contact area between the motor busbar and the inverter busbar directly or via the bolt to the terminal block.

Description

motor unit

The present invention relates to a motor unit.

A configuration is known in which an inverter that controls the rotating electrical machine is mounted on a motor case that houses the rotating electrical machine that drives the vehicle, thereby integrating the rotating electrical machine and the inverter to achieve downsizing. JP2012-170177A describes a terminal block in which a bus bar extending from a stator coil terminal of a rotating electrical machine is integrally formed with a fixed pedestal arranged to cover an opening of a motor case in a configuration in which a rotating electrical machine and an inverter are integrated. A configuration is disclosed in which the inverter is connected to the inverter via the inverter.

By the way, there are tolerances in the dimensions of each component such as the motor case, fixed pedestal, terminal block, and bus bar. If there is a gap between the terminal block and the bus bar due to tolerances, when screwing the bus bar to the terminal block, it is necessary to deform the bus bar by the gap and then tighten the bus bar. When fastened in this way, part of the fastening axial force of the screws will be used to deform the bus bar, so there is a risk that the desired fastening force will not be obtained and the contact resistance of the fastened portion will increase. There is.

Therefore, an object of the present invention is to reduce the fastening axial force used to deform the bus bar when screwing the bus bar to the terminal block, and to suppress an increase in contact resistance.

According to an aspect of the present invention, a rotating electrical machine, a motor case that houses the rotating electrical machine, an inverter that controls power supplied to the rotating electrical machine, an inverter case that houses the inverter, and one end of which is connected to the rotating electrical machine. The motor case and the inverter case are integrated, including a plate-shaped motor bus bar, a plate-shaped inverter bus bar whose one end is connected to the inverter, and a terminal block to which the motor bus bar and the inverter bus bar are fixed with bolts and nuts. A motor unit is provided. In this motor unit, the nut is held on the terminal block so as to be movable in the axial direction of the bolt. The bolt passes through a through hole provided in each of the motor bus bar and the inverter bus bar and is fastened to the nut. Furthermore, the motor unit includes a lid portion fixed to the motor case, and a lid portion that protrudes from the lid portion to the inside of the motor case, and is pressed against the terminal block by pressing the contact portion between the motor bus bar and the inverter bus bar directly or through a bolt. The cover member is made of an insulating material and includes a protrusion.

FIG. 1 is a schematic configuration diagram of a motor unit according to an embodiment of the present invention. FIG. 2 is a sectional view of the vicinity of the terminal block. FIG. 3 is a diagram showing an example of a nut holding part and a nut. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. FIG. 5 is a sectional view showing a state of a general bus bar connection structure before bolts are fastened. FIG. 6 is a sectional view showing a state of a general bus bar connection structure after bolts are fastened. FIG. 7 is a sectional view of the vicinity of the terminal block of the motor unit according to the first modification. FIG. 8 is a diagram showing an example of a state of the cover member after deformation according to the first modification. FIG. 9 is a diagram showing another example of the state of the cover member after deformation according to the first modification. FIG. 10 is a sectional view of the vicinity of the terminal block of the motor unit according to the second modification.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic configuration diagram of a motor unit 1 according to the present embodiment.

The motor unit 1 shown in FIG. 1 is mounted on an electric vehicle. The electric vehicle herein includes so-called battery electric vehicles and hybrid electric vehicles.

The motor unit 1 is electrically connected to a battery (not shown) as a power source, a rotating electric machine (hereinafter also referred to as an electric motor) 5 as a drive source for driving wheels, and the battery and the electric motor 5. and an inverter 4. The motor unit 1 drives the electric motor 5 using electric power discharged from the battery, and charges the battery using electric power generated by the electric motor 5.

The electric motor 5 is a three-phase AC motor consisting of a stator 5A, a rotor shaft 5B, and a rotor 5C, and has a U-phase terminal, a V-phase terminal, and a W-phase terminal, and basically functions as a drive source, such as when decelerating a vehicle. functions as a generator during regeneration.

The inverter 4 is a power conversion device that is electrically connected to the battery and the electric motor 5. The inverter 4 basically converts the DC power of the battery into AC power and supplies it to the electric motor 5. During regeneration, the inverter 4 converts the AC power from the electric motor 5 into DC power and supplies it to the battery.

The electric motor 5 is housed in the motor case 2, and the inverter 4 is housed in the inverter case 3. The motor case 2 and the inverter case 3 are formed by casting aluminum alloy or the like, for example. Although the motor case 2 and the inverter case 3 are integrally formed in FIG. 1, they may be manufactured separately and then connected using bolts or the like to be integrated. Further, in FIG. 1, the inverter case 3 is formed above the motor case 2 in the vertical direction of the vehicle body, but it is not limited thereto, and may be formed, for example, on the rear side in the longitudinal direction of the vehicle body.

The motor case 2 has a cylindrical space corresponding to the outer shape of the electric motor 5, and the electric motor 5 is fixed in the space.

The inverter case 3 has a box-shaped space, and the semiconductor modules, capacitors, controllers, etc. that make up the inverter 4 and a cooler for cooling these are housed in the space. Note that the upper surface of the inverter case 3 is covered with a lid (not shown).

The electric motor 5 and inverter 4 housed as described above are electrically connected via the inverter bus bar 6 and the motor bus bar 8 (see FIG. 2). A specific configuration of the connection portion between the inverter bus bar 6 and the motor bus bar 8 will be described later.

The inverter bus bar 6 here is a general term for the U-phase inverter bus bar 6U, the V-phase inverter bus bar 6V, and the W-phase inverter bus bar 6W. Similarly, the motor bus bar 8 is a general term for U-phase, V-phase, and W-phase motor bus bars. If there is no need to distinguish which phase they belong to, they will be referred to as an inverter bus bar 6 and a motor bus bar 8, respectively.

One end of the U-phase inverter bus bar 6U, V-phase inverter bus bar 6V, and W-phase inverter bus bar 6W is connected to the U-phase connection 4U, V-phase connection 4V, and W-phase connection 4W of the inverter 4, respectively. The other end is connected to the motor bus bar 8 at a terminal block 10, which will be described later. Note that a current sensor 7U for detecting the U-phase current is attached to the U-phase inverter bus bar 6U. Similarly, current sensors 7V and 7W are attached to the V-phase inverter bus bar 6V and the W-phase inverter bus bar 6W.

The motor unit 1 configured as described above has a plurality of mounts (Fig. (not shown). The location where the motor unit 1 is mounted may be in a motor room provided at the front of the vehicle, under the floor at the rear of the vehicle, or at both the front and rear of the vehicle. .

Next, the specific structure of the connection between the inverter busbar 6 and the motor busbar 8 (hereinafter also referred to as busbar connection structure) will be described with reference to FIG. 2.

FIG. 2 is a sectional view of the motor unit 1 around the terminal block 10 along a plane perpendicular to the vehicle longitudinal direction. The connection portion between the inverter bus bar 6 and the motor bus bar 8 has the same structure for all of the U phase, V phase, and W phase, and the W phase will be explained here.

The terminal block 10 is provided inside the motor case 2. The terminal block 10 also includes a nut holder 13 and a nut 12 housed in the nut holder 13. Here, the nut holding portion 13 and the nut 12 will be explained with reference to FIGS. 3 and 4.

3 is a diagram of an example of the nut holding portion 13 and the nut 12 viewed from the axial direction, and FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3.

The nut holding portion 13 includes a hole portion 13B having a rectangular cross-sectional shape. A rod-shaped support member 13A extending in the depth direction of the hole 13B is arranged on each side surface of the hole 13B.

The nut 12 is a so-called floating nut that has a rectangular cross-sectional shape and is housed in the hole 13B so as to be freely movable in the depth direction, and rotation about the bolt hole 12A is restricted. Note that the shapes of the hole portion 13B and the nut 12 are not limited to those described above, and other shapes may be used as long as they function as a floating nut.

Returning to the explanation of FIG. 2.

The motor bus bar 8W is formed of a flat member, and includes an arm portion 8W-1 extending along a direction parallel to the rotation axis with the coil end of the stator of the electric motor 5 as the base end, and an arm portion 8W-1. A motor-side fastened portion 8W-2 extends from the tip of the motor in a direction perpendicular to the rotation axis. A through hole 16 through which a bolt 11 passes is provided in the motor side fastened portion 8W-2.

The inverter bus bar 6W is also formed of a flat member. The inverter bus bar 6W includes an inverter-side fastened portion 6W-1 that intersects the boundary surface S between the motor case 2 and the inverter case 3 and extends from the inverter case 3 to the motor case 2. The inverter side fastened portion 6W-1 is in an unmolded state (that is, a non-molded state), and a through hole 17 through which the bolt 11 passes is provided near the end on the motor case 2 side.

The motor-side fastened part 8W-2 and the inverter-side fastened part 6W-1 are at least partially in surface contact with each other such that their through holes overlap, and are fastened with bolts 11 and nuts 12 in this state. . Then, the portions of the motor-side fastened portion 8W-2 and the inverter-side fastened portion 6W-1 that are in surface contact are pressed against the terminal block 10 by the cover member 14 directly or via the bolts 11. The cover member 14 is made of, for example, an insulating resin member, and includes a lid portion 14-1 that closes the working hole of the motor case 2, and a protrusion portion 14 that projects from the lid portion 14-1 to the inside of the motor case 2. -2. Then, the protruding portion 14-2 presses directly or via the bolt 11 the surface contacting portions of the motor-side fastened portion 8W-2 and the inverter-side fastened portion 6W-1. Note that a seal member 15 for ensuring waterproofness is arranged at a portion of the motor case 2 where the cover member 14 is attached.

Next, the effects of using the bus bar connection structure as described above will be explained with reference to FIGS. 2, 5, and 6. 5 and 6 are cross-sectional views showing a general bus bar connection structure different from this embodiment. FIG. 5 shows a state before fastening with bolts 11, and FIG. 6 shows a state after fastening with bolts 11. It shows. The busbar connection structure of FIGS. 5 and 6 differs from the busbar connection structure of this embodiment shown in FIG. 2 in that the nut 22 of the terminal block 20 is fixed and that the cover member 14 is not provided.

The motor unit 1 is made smaller by integrating a motor case 2 that accommodates an electric motor 5 and an inverter case 3 that accommodates an inverter 4. However, if such an integrated configuration is adopted, the routing of the motor bus bar 8 and the inverter bus bar 6 becomes complicated in order to suit the layout of the electric motor 5 and the inverter 4, and the bus bar path becomes long. As a result, when vibrations are input while the vehicle is running, the amplitude of the vibrations of the motor bus bar 8 and the inverter bus bar 6 becomes large, and there is a possibility that an unexpected load will be applied to the motor bus bar 8 and the inverter bus bar 6. This problem can be solved by providing the terminal block 20 and fixing the motor bus bar 8 and the inverter bus bar 6 there, since the fixed part becomes a vibration node and vibration is suppressed. However, since there are tolerances in the dimensions of parts such as the bus bars 6 and 8 and the terminal block 20, as shown in FIG. An axial gap may occur between the nut 22 of the nut 20 and the nut 22 of the nut 20. When the bolt 11 is tightened with this gap created, as shown in FIG. The connecting portion is fixed in a deformed state until it comes into contact with the nut 22 fixed to the terminal block 20. In this fixed state, an elastic force is generated due to deformation of the inverter-side fastened portion 6W-1 and the motor-side fastened portion 8W-2, and this elastic force acts in a direction to move the connecting portion away from the nut 22. For this reason, a part of the fastening axial force of the bolt 11 and nut 22 is consumed to offset the above elastic force, and due to insufficient fastening axial force, the inverter side fastened part 6W-1 and the motor side fastened part Contact resistance with 8W-2 may increase.

On the other hand, in the bus bar connection structure of this embodiment, since the nut 12 is a floating nut, when the bolt 11 is tightened with the above-mentioned axial clearance, the inverter side fastened part 6W-1 and the motor side fastened part 8W-2 are deformed in a direction in which they approach each other. Therefore, the elastic force generated when the bolts 11 and nuts 12 are fastened is smaller than that in the state shown in FIG. 6 described above. Further, in the bus bar connection structure of this embodiment, the cover member 14 presses the inverter side fastened portion 6W-1 and the motor side fastened portion 8W-2 against the terminal block 10. This suppresses vibration by making the connection between the inverter-side fastened part 6W-1 and the motor-side fastened part 8W-2 a vibration node, and also suppresses an increase in contact resistance at the connection. Can be done.

In addition, in the inverter bus bar 6 of this embodiment, the inverter side fastened portion 6W-1 extends from the inverter case 3 to the motor case 2 and is in a non-molded state, so it can be used when the bus bar length is short or when the bus bar is molded. In comparison, it has low rigidity and is easily deformed. The motor bus bar 8 of this embodiment also includes an arm portion 8W-1 extending in the axial direction and a motor-side fastened portion 8W-2 extending from the end of the arm portion 8W-1 in a direction perpendicular to the axial direction. Therefore, it is easily deformed in response to input from the axial direction. Therefore, fastening work using the bolts 11 is easy. Note that since the cover member 14 is made of a resin material having insulating properties, it will not be electrically short-circuited even if it comes into contact with the bolt 11, motor bus bar 8, or inverter bus bar 6.

As described above, in this embodiment, the electric motor 5 (rotating electric machine), the motor case 2 that houses the electric motor 5, the inverter 4 that controls the electric power supplied to the electric motor 5, and the inverter case that houses the inverter 4 3, a plate-shaped motor bus bar 8 whose one end is connected to the electric motor 5, a plate-shaped inverter bus bar 6 whose one end is connected to the inverter 4, and the motor bus bar 8 and the inverter bus bar 6 are connected to bolts 11 and nuts. A motor unit 1 is provided in which a motor case 2 and an inverter case 3 are integrated, and a terminal block 10 fixed by a terminal block 12 is provided. In this motor unit 1, the nut 12 is held movably in the axial direction of the bolt 11 by the terminal block 10, and the bolt 11 passes through the through hole provided in each of the motor bus bar 8 and the inverter bus bar 6 and connects to the nut 12. It is concluded. Furthermore, a lid part 14-1 fixed to the motor case 2 and a part protruding from the lid part 14-1 to the inside of the motor case 2 press the contact part between the motor bus bar 8 and the inverter bus bar 6 directly or through the bolt 11. The cover member 14 is provided with a protruding portion 14-2 that is pressed against the terminal block 10 by doing so, and is formed of an insulating member. As a result, even if the bolts are fastened in a state where the dimensions of each part such as the motor bus bar 8 and the inverter bus bar 6 vary within the tolerance range, the fastening axial force used to deform the motor bus bar 8 and the inverter bus bar 6 can be reduced. It is possible to reduce the contact resistance and suppress an increase in contact resistance. In addition, since the cover member 14 presses the connecting portion between the motor bus bar 8 and the inverter bus bar 6 against the terminal block 10, the connecting portion becomes a vibration node, so that vibrations of the motor bus bar 8 and the inverter bus bar 6 can be suppressed. Furthermore, since the cover member 14 is made of an insulating material, no electrical short circuit will occur.

In this embodiment, the inverter bus bar 6 extends from the inverter case 3 to the motor case 2 by intersecting the boundary surface S between the motor case 2 and the inverter case 3, and is in a non-molded inverter side fastened portion 6W- 1. The motor bus bar 8 includes an arm portion 8W-1 that extends along a direction parallel to the rotational axis of the electric motor 5 with the coil end of the stator 5A of the electric motor 5 as the base end, and an arm portion 8W-1 extending from the tip of the arm portion 8W-1 to the electric motor. A motor-side fastened portion 8W-2 extending along a direction perpendicular to the rotation axis of No. 5 is provided. Through holes 16 and 17 are provided in the inverter side fastened portion 6W-1 and the motor side fastened portion 8W-2, respectively. Generally, in the process of assembling the motor unit 1, the work of fastening the inverter bus bar 6 and the motor bus bar 8 is difficult because of positional deviations caused by variations in the dimensions of each component. If the bolts and nuts are forcibly fastened in a state where the positional deviation exists, there is a risk that stress will be applied to each component or that the fastening axial force will be insufficient. However, the inverter bus bar 6 and the motor bus bar 8 of the motor unit 1 according to the present embodiment both have extended portions, and furthermore, the inverter bus bar 6 is in a non-molded state, so its rigidity is suppressed. Therefore, even if the parts are fastened with misalignment, stress on each component can be suppressed and the fastening axial force can be ensured.

Next, modifications of this embodiment will be described with reference to FIGS. 7 to 10. Note that each modification described below belongs to the scope of the present invention as well as the present embodiment described above.

[First modification]
FIG. 7 is a sectional view showing a busbar connection structure according to a first modification. The difference from FIG. 2 is the shape of the cover member 14. This difference will be mainly explained below.

The motor unit 1 according to this modification is arranged in a region sandwiched between a pair of side members in a motor room provided at the front of the vehicle, with the axial direction and the longitudinal direction of the vehicle perpendicular to each other.

The cover member 14 according to this modification includes a lid part 14-1 that closes a working hole provided on the side surface of the motor case 2 in the vehicle width direction, and a protrusion part that projects from the lid part 14-1 to the inside of the motor case 2. Equipped with 14-2. The protruding portion 14-2 presses directly or via the bolt 11 the surface-contact portions of the motor-side fastened portion 8W-2 and the inverter-side fastened portion 6W-1. Furthermore, the protrusion 14-2 includes a low-strength portion 14-3 having lower strength than other portions of the protrusion 14-2.

In the low-strength portion 14-3, at least the lid portion 14-1 is fixed to the working hole, and the protruding portion 14-2 is in surface contact with the motor-side fastened portion 8W-2 and the inverter-side fastened portion 6W-1. It has a strength that will not deform against axial stress that occurs when the bolt 11 is in contact with the other part or the bolt 11. Further, the strength of the low-strength portion 14-3 is set to such a level that it deforms when a predetermined input is applied from the axial direction in the above state. Note that the term "deformation" here includes breakage. Although the magnitude of the predetermined input is not particularly limited, for example, if the cover member 14 does not have the low-strength portion 14-3, the inverter bus bar 6 and motor bus bar 8 will be pressed by the protruding portion 14-2. And the size is such that the terminal block 10 etc. are deformed.

When the vehicle collides with another vehicle or an obstacle from the front, there is a risk that the side members will be deformed by the input from the front of the vehicle and interfere with the side surfaces of the motor unit 1 in the vehicle width direction. In this case, if the side member presses the cover member 14, there is a risk that the motor bus bar 8 or the inverter bus bar 6 will be ruptured by being pressed through the cover member 14, resulting in a short circuit with the motor case 2 or the inverter case 3. However, if the protruding part 14-2 is provided with the low-strength part 14-3, the input to the motor bus bar 8, inverter bus bar 6, etc. will be alleviated by deformation of the low-strength part 14-3, so that the above-mentioned Can prevent short circuits.

Although the shape of the low-strength portion 14-3 is not particularly limited, it is more desirable that the shape is capable of dispersing input from the axial direction in the vertical direction of the vehicle body by deforming.

8 and 9 both show examples of shapes that can disperse input from the axial direction in the vertical direction of the vehicle body. The low-strength portion 14-3 in FIG. 8 is bent convexly upward in the vertical direction of the vehicle body with respect to the axial direction. With this shape, when pressed by a side member or the like, the bent portion deforms to a more acute angle, so that input from the axial direction can be dispersed upward in the vertical direction of the vehicle body. Furthermore, the low strength portion 14-3 in FIG. 9 is linear and inclined in the vertical direction of the vehicle body with respect to the axial direction. Since the positions of both ends of the low-strength portion 14-3 in the vehicle body vertical direction are shifted, when an input is received from the axial direction, a moment is generated in the low-strength portion 14-3. In the case of the shape shown in FIG. 9, a moment is generated that rotates the low strength portion 14-3 clockwise in FIG. That is, according to the shape shown in FIG. 9, when the lid part 14-1 is pressed by a side member or the like, the low-strength part 14-3 deforms according to the moment, and the input from the axial direction is applied to the top and bottom of the vehicle body. It can be dispersed in a downward direction.

As described above, in this modification, the vehicle has a pair of side members spaced apart in the vehicle width direction at the front of the vehicle body and extending in the longitudinal direction of the vehicle body, and the motor case 2 is located in the area sandwiched between the pair of side members. The lid portion 14-1 is fixed to the side surface of the motor case 2 in the vehicle width direction, and the protruding portion 14-2 has a low-strength portion 14-3 whose strength is lower than other portions of the protruding portion 14-2. has. As a result, even if the side member deforms due to a collision load and interferes with the motor unit 1, the load applied from the side member to the inverter bus bar 6 and motor bus bar 8 is reduced by deforming the low strength portion 14-3. can.

[Second modification]
FIG. 10 is a sectional view showing a busbar connection structure according to a second modification. The difference from FIG. 2 is the structure of the cover member 14. The cover member 14 of this modification is made of a material that forms the cover member 14 between the end of the protrusion 14-2 on the lid part 14-1 side and the end of the protrusion 14-2 on the terminal block 10 side. The heat transfer material 23 is made of a material having a higher thermal conductivity than the above. The heat transfer material 23 is made of, for example, a sheet-like material, and is attached to the outer surface of the protrusion 14-2. Further, the protrusion 14-2 may have a hollow structure and be attached to the inner surface thereof.

By providing the heat transfer material 23 on the protruding portion 14-2 as described above, the heat of the fastening portion between the inverter bus bar 6 and the motor bus bar 8 is easily transferred to the lid portion 14-1.

The motor case 2 is generally cooled with a refrigerant such as cooling water or oil in order to cool the coil of the electric motor 5. Therefore, heat from the lid portion 14-1 fixed to the motor case 2 easily flows to the motor case 2. That is, by providing the heat transfer material 23 as described above, it becomes easier to release heat from the joint between the inverter bus bar 6 and the motor bus bar 8 to the motor case 2.

As described above, in this modification, the cover member 14 is provided between the end of the protruding part 14-2 on the lid part 14-1 side and the end of the protruding part 14-2 on the terminal block 10 side. The heat transfer material 23 has a higher thermal conductivity than the material forming the material. Thereby, heat from the joint between the inverter bus bar 6 and the motor bus bar 8 can easily escape to the motor case 2.

Although the embodiments of the present invention have been described above, the above embodiments merely show a part of the application examples of the present invention, and are not intended to limit the technical scope of the present invention to the specific configurations of the above embodiments. do not have.

Claims (4)

rotating electric machine,
a motor case that houses the rotating electrical machine;
an inverter that controls power supplied to the rotating electrical machine;
an inverter case that houses the inverter;
a plate-shaped motor bus bar having one end connected to the rotating electrical machine;
a plate-shaped inverter bus bar having one end connected to the inverter;
a terminal block to which the motor bus bar and the inverter bus bar are fixed with bolts and nuts;
Equipped with
In a motor unit in which the motor case and the inverter case are integrated,
The nut is held on the terminal block so as to be movable in the axial direction of the bolt,
The bolt passes through a through hole provided in each of the motor bus bar and the inverter bus bar and is fastened to the nut,
Furthermore, a lid portion fixed to the motor case, and a lid portion protruding from the lid portion to the inside of the motor case to press a contact portion between the motor bus bar and the inverter bus bar directly or through the bolt, thereby forming the terminal. A motor unit comprising a cover member formed of an insulating member and having a protruding portion pressed against a base. The motor unit according to claim 1, which is mounted on a vehicle,
The vehicle has a pair of side members spaced apart in the vehicle width direction at the front of the vehicle body and extending in the longitudinal direction of the vehicle body,
The motor case is arranged in an area sandwiched between the pair of side members,
The lid portion is fixed to a side surface of the motor case in the vehicle width direction,
The protrusion has a low strength part that is lower in strength than other parts of the protrusion.
motor unit. The motor unit according to claim 1 or 2,
The cover member includes a heat transfer material having a higher thermal conductivity than the material forming the cover member between the end of the protrusion on the lid side and the end of the protrusion on the terminal block side. A motor unit. The motor unit according to claim 1,
The inverter bus bar extends from the inverter case to the motor case by intersecting the interface between the motor case and the inverter case, and includes an inverter-side fastened portion in a non-molded state;
The motor bus bar has an arm extending in a direction parallel to the rotation axis of the rotation electric machine with the coil end of the stator of the rotation electric machine as the base end, and an arm extending in a direction perpendicular to the rotation axis from the tip of the arm. a motor-side fastened portion extending along the motor side;
A motor unit, wherein the inverter side fastened portion and the motor side fastened portion are each provided with the through hole.

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