JP2024061285A - Rotary electric machine - Google Patents

Abstract

To provide a rotary electric machine capable of suppressing enlargement in a radial direction, while securing isolation between a coil and a housing.SOLUTION: A rotary electric machine has a stator arranged outside a rotor in a radial direction, a band-shaped sheet member 60 with insulation quality, and a housing accommodating the rotor, the stator, and the sheet member. The stator has a stator core 31, an insulator having an annular-shaped annular part 34, and an accommodation part 39. An external diameter 34a of a large diameter part of the annular part is smaller than an external diameter of the stator core and is larger than an external diameter of a small diameter part 34d. The accommodation part is composed of a surface facing the stator core among a surface facing the axial direction outside of the small diameter part and a surface facing the axial direction of the large diameter part, and a surface facing the large diameter part among a surface facing the axial direction of the stator core. A portion of the sheet member is wound around the outer peripheral surface of the large diameter part along the circumferential direction, and at least a portion of the sheet member can be accommodated within the accommodation part.SELECTED DRAWING: Figure 5

Description

The present invention relates to a rotating electric machine.

There is a known motor in which multiple coil body parts attached to a stator are connected to each other by jumper wires (connecting wires). For example, Patent Document 1 describes a motor in which a resin jumper wire insulator is placed between the housing and the jumper wire that runs along the outer periphery of a support wall that is pressed into the outer periphery of the stator, ensuring insulation between the jumper wire and the housing.

JP 2015-226330 A

In motors like the one described above, the crossover insulation is formed by resin molding, so the radial dimensions of the crossover insulation tend to be large. This means that the housing tends to be large in the radial direction, which raises the risk of the rotating electric machine becoming large in the radial direction.

In view of the above circumstances, one aspect of the present invention aims to provide a rotating electric machine that can prevent the radial size from increasing while ensuring insulation between the coil and the housing.

One aspect of the rotating electric machine of the present invention includes a rotor rotatable about a central axis, a stator arranged radially outside the rotor and facing the rotor with a gap in the radial direction, an insulating band-shaped sheet member, and a housing that accommodates the rotor, the stator, and the sheet member. The stator has a stator core whose outer circumferential surface is fixed to the housing, an insulator having an annular portion that covers at least a portion of the stator core in the axial direction, and an accommodating portion. The annular portion has an annular large diameter portion centered on the central axis, and an annular small diameter portion centered on the central axis, which is arranged between the large diameter portion and the stator core in the axial direction. The small diameter portion is connected to the large diameter portion in the axial direction. The outer diameter of the large diameter portion is smaller than the outer diameter of the stator core and larger than the outer diameter of the small diameter portion. The housing portion is composed of a surface of the small diameter portion facing radially outward, a surface of the large diameter portion facing the axial direction that faces the stator core, and a surface of the stator core facing the axial direction that faces the large diameter portion. A portion of the sheet member is wrapped around the outer peripheral surface of the large diameter portion in the circumferential direction, and at least a portion of the sheet member can be housed inside the housing portion.

According to one aspect of the present invention, in a rotating electric machine, it is possible to prevent the radial size from increasing while ensuring insulation between the coil and the housing.

FIG. 1 is a schematic cross-sectional view showing a rotating electric machine according to a first embodiment. FIG. 2 is a perspective view showing the stator core of the first embodiment. FIG. 3 is a perspective view showing a part of the rotating electric machine according to the first embodiment. FIG. 4 is a perspective view showing the insulator of the first embodiment. FIG. 5 is a cross-sectional view showing a part of the rotating electric machine according to the first embodiment. FIG. 6 is a cross-sectional view showing the tape member of the first embodiment. FIG. 7A is a perspective view showing a winding process of the rotating electric machine of the first embodiment. FIG. 7B is a first cross-sectional view showing a winding process of the rotating electric machine of the first embodiment. FIG. 7C is a second cross-sectional view showing the winding process of the rotating electric machine of the first embodiment. FIG. 7D is a cross-sectional view showing a stator fixing step of the first embodiment. FIG. 8 is a cross-sectional view showing a part of a rotating electric machine according to the second embodiment. FIG. 9 is a cross-sectional view showing another part of the rotating electric machine according to the second embodiment.

The following describes a rotating electric machine according to an embodiment of the present invention with reference to the drawings. Note that the scope of the present invention is not limited to the following embodiment, and can be modified as desired within the scope of the technical concept of the present invention. In addition, in the following drawings, the scale and number of each structure may differ from the actual structure in order to make each configuration easier to understand.

In the following description, the Z axis is shown in the figures as appropriate. The Z axis indicates the direction in which the central axis J of the rotating electric machine 1 extends. The central axis J shown in each figure is a virtual axis line. In the following description, the direction in which the central axis J extends, that is, the direction parallel to the Z axis, is called the "axial direction". The radial direction centered on the central axis J is simply called the "radial direction". The circumferential direction centered on the central axis J is simply called the "circumferential direction". The side in the axial direction toward which the arrow of the Z axis points (+Z side) is called the "one axial side" or "upper side". The side in the axial direction opposite to the side toward which the arrow of the Z axis points (-Z side) is called the "other axial side" or "lower side". Note that the upper side and the lower side are names simply used to describe the relative positional relationship of each part, and the actual positional relationship, etc. may be a positional relationship, etc. other than the positional relationship, etc. indicated by these names.

The circumferential direction is indicated by the arrow θ in each figure. The side of the circumferential direction toward which the arrow θ points (+θ side) is called "one circumferential side." The opposite side of the circumferential direction to the side toward which the arrow θ points (-θ side) is called "the other circumferential side." The one circumferential side is the side that moves counterclockwise around the central axis J when viewed from above. The other circumferential side is the side that moves clockwise around the central axis J when viewed from above.

First Embodiment
The rotating electric machine 1 of this embodiment shown in Fig. 1 is a motor attached to an apparatus mounted on a vehicle. The apparatus to which the rotating electric machine 1 is attached may be an automatic transmission or a drive device that drives an axle of the vehicle. The rotating electric machine 1 of this embodiment is an inner rotor type three-phase brushless DC motor. The rotating electric machine 1 includes a housing 11, a rotor 20, a stator 30, a control device 70, and a seat member 60.

The housing 11 accommodates the rotor 20, the stator 30, the control device 70, and the sheet member 60. In this embodiment, the housing 11 is made of metal. The housing 11 is conductive. The housing 11 has a housing member 12 and a cover member 13.

The housing member 12 accommodates the rotor 20, the stator 30, the control device 70, and the seat member 60. The housing member 12 is cylindrical and extends axially about the central axis J. An opening 12d that opens upward is provided at the upper end of the housing member 12. The housing member 12 has a peripheral wall portion 12a, a bottom wall portion 12b, and a second bearing retaining portion 12c.

The peripheral wall portion 12a is cylindrical and extends in the axial direction around the central axis J. The peripheral wall portion 12a surrounds the rotor 20, the stator 30, the control device 70, and the seat member 60 from the radial outside. The stator 30 is fixed to the inner peripheral surface of the peripheral wall portion 12a. The inner peripheral surface of the peripheral wall portion 12a is provided with a stepped surface 12f facing upward.

The bottom wall portion 12b is annular plate-shaped and centered on the central axis J. The plate surface of the bottom wall portion 12b faces the axial direction. The radial outer edge of the bottom wall portion 12b is connected to the lower end of the peripheral wall portion 12a. The bottom wall portion 12b is provided with a hole portion 12e that penetrates in the axial direction. The hole portion 12e is a circular hole centered on the central axis J. The second bearing retaining portion 12c is annular and centered on the central axis J, protruding upward from the bottom wall portion 12b.

The lid member 13 is fixed to the upper end of the housing member 12. The lid member 13 closes the opening 12d from above. The lid member 13 has a lid main body portion 13a and a first bearing holding portion 13b.

The lid body 13a is disk-shaped and centered on the central axis J. The plate surface of the lid body 13a faces the axial direction. The radial outer edge of the lid body 13a is fixed to the upper end of the housing member 12. The first bearing retaining portion 13b is annular and centered on the central axis J, protruding downward from the lid body 13a.

The rotor 20 can rotate around a central axis J. The rotor 20 has a rotor core 21, a shaft 22, a plurality of magnets (not shown), a first bearing 91, and a second bearing 92.

The rotor core 21 is annular about the central axis J. A shaft 22 passes through the rotor core 21 in the axial direction. The shaft 22 is fixed to the inner peripheral surface of the rotor core 21. A plurality of magnets (not shown) are fixed to the rotor core 21. The magnets are each arranged at intervals along the circumferential direction.

The shaft 22 is cylindrical and extends axially about the central axis J. The upper portion of the shaft 22 extends above the rotor core 21 and is supported by the first bearing 91. The lower portion of the shaft 22 extends below the rotor core 21 and protrudes to the outside of the housing 11 through the hole 12e. The lower portion of the shaft 22 is supported by the second bearing 92.

The first bearing 91 supports the portion of the shaft 22 above the rotor core 21 so that it can rotate around the central axis J. The first bearing 91 is held by the first bearing holder 13b. The second bearing 92 supports the portion of the shaft 22 below the rotor core 21 so that it can rotate around the central axis J. The second bearing 92 is held by the second bearing holder 12c. This allows the rotor 20 to rotate around the central axis J. In this embodiment, the first bearing 91 and the second bearing 92 are ball bearings. The first bearing 91 and the second bearing 92 may be plain bearings.

The stator 30 is disposed radially outside the rotor 20. The stator 30 faces the rotor 20 with a radial gap therebetween. The stator 30 has a stator core 31, an insulator 32, a coil portion 38, and a housing portion 39. The stator 30 generates a magnetic field when a current flows through the coil portion 38. A rotational torque is generated in the rotor 20 by the magnetic force between the magnetic poles of the magnetic field generated in the stator 30 and multiple magnets (not shown) that the rotor 20 has.

The stator core 31 is annular about the central axis J. The stator core 31 surrounds the rotor core 21 from the radial outside. The outer peripheral surface of the stator core 31 is fixed to the peripheral wall portion 12a. In other words, the outer peripheral surface of the stator core 31 is fixed to the housing 11. The radial outer edge of the surface of the stator core 31 facing downward is in axial contact with the step surface 12f of the housing member 12. This determines the axial position of the stator 30 relative to the housing 11. As shown in FIG. 2, the stator core 31 has a core back portion 31a and multiple teeth portions 31b.

The core back portion 31a is annular about the central axis J. As shown in FIG. 1, the outer peripheral surface of the core back portion 31a is fixed to the inner peripheral surface of the peripheral wall portion 12a. This fixes the stator 30 to the housing 11. As shown in FIG. 2, the core back portion 31a has a plurality of first inner surfaces 31c facing radially inward. When viewed in the axial direction, each of the plurality of first inner surfaces 31c is arc-shaped. The plurality of first inner surfaces 31c are arranged at approximately equal intervals along the circumferential direction. In this embodiment, twelve first inner surfaces 31c are provided.

Each of the multiple teeth 31b protrudes radially inward from the inner peripheral surface of the core back portion 31a. The multiple teeth 31b are arranged side by side along the inner peripheral surface of the core back portion 31a. In this embodiment, 12 teeth 31b are provided. As shown in FIG. 1, the surface of each tooth 31b facing radially inward faces the outer peripheral surface of the rotor core 21 with a radial gap therebetween.

The insulator 32 insulates the stator core 31 from the coil portion 38. As shown in Figures 3 and 4, the insulator 32 has an insulator body portion 33, an annular portion 34, and a number of columnar portions 35. Although not shown in detail, the insulator 32 is composed of two members that are separated in the axial middle of the insulator body portion 33. The two members of the insulator 32 are attached to the stator core 31 from one axial side and the other axial side, respectively, and face each other in the axial middle of the stator core 31.

The insulator body 33 surrounds a portion of the stator core 31. As shown in FIG. 4, the insulator body 33 has a wall portion 33b and a teeth accommodating portion 33c.

The wall portion 33b is a plate extending in the axial direction. The plate surface of the wall portion 33b faces the radial direction. When viewed in the axial direction, the wall portion 33b is arc-shaped. A plurality of the wall portions 33b are arranged at approximately equal intervals along the circumferential direction. In this embodiment, twelve wall portions 33b are provided. Each of the wall portions 33b is arranged radially inside the first inner surface 31c of the stator core 31 shown in FIG. 2. This insulates the coil portion 38 from the core back portion 31a.

As shown in FIG. 4, the tooth accommodating portion 33c is a hollow, generally rectangular parallelepiped that protrudes radially inward from the wall portion 33b. A plurality of tooth accommodating portions 33c are arranged at equal intervals along the circumferential direction. In this embodiment, twelve tooth accommodating portions 33c are provided. Although not shown in the figure, each tooth accommodating portion 33c accommodates a corresponding one of the tooth portions 31b therein. Each tooth accommodating portion 33c is attached to a corresponding one of the tooth portions 31b. This insulates the coil portion 38 from the tooth portions 31b.

The annular portion 34 is annular about the central axis J. As shown in FIG. 5, the radial inner edge of the annular portion 34 is radially connected to the radial outer edge of the tooth accommodating portion 33c. The annular portion 34 is disposed on the upper side of the stator core 31. The annular portion 34 covers at least a portion of the upper side of the stator core 31, i.e., one axial side (+Z side). That is, the annular portion 34 covers at least a portion of the stator core 31 in the axial direction. In this embodiment, the lower end of the annular portion 34 is in axial contact with the surface of the stator core 31 facing the upper side. The annular portion 34 may be disposed axially away from the stator core 31. The annular portion 34 has a large diameter portion 34a and a small diameter portion 34d.

The large diameter portion 34a is annular about the central axis J. The large diameter portion 34a is the upper portion of the annular portion 34. The outer diameter of the large diameter portion 34a is smaller than the outer diameter of the stator core 31. The outer peripheral surface of the large diameter portion 34a is located radially inward from the outer peripheral surface of the stator core 31. A groove portion 34b is provided in the large diameter portion 34a. The groove portion 34b is recessed radially inward from the outer peripheral surface of the large diameter portion 34a, i.e., the surface facing radially outward. As shown in FIG. 4, the groove portion 34b is provided around the entire circumference along the outer peripheral surface of the large diameter portion 34a.

The small diameter portion 34d is annular about the central axis J. As shown in FIG. 5, in the axial direction, the small diameter portion 34d is disposed between the large diameter portion 34a and the stator core 31. The small diameter portion 34d is axially connected to the lower end of the large diameter portion 34a, i.e., the end on the other axial side (-Z side). The small diameter portion 34d is the lower part of the annular portion 34. The outer diameter of the small diameter portion 34d is smaller than the outer diameter of the large diameter portion 34a. That is, the outer diameter of the large diameter portion 34a is larger than the outer diameter of the small diameter portion 34d. The outer diameter of the small diameter portion 34d is smaller than the outer diameter of the stator core 31. The surface facing the lower side of the small diameter portion 34d faces the upper side of the stator core 31, i.e., the surface facing the one axial side (+Z side). In this embodiment, the surface facing the lower side of the small diameter portion 34d contacts the surface facing the upper side of the stator core 31. The surface of the small diameter portion 34d facing downward may be spaced apart from the surface of the stator core 31 facing upward.

The accommodation section 39 is composed of the surface of the small diameter section 34d facing radially outward, the lower side of the large diameter section 34a, i.e., the surface facing the other axial side (-Z side), and the upper side of the stator core 31, i.e., the surface facing one axial side (+Z side). That is, the accommodation section 39 is composed of the surface of the small diameter section 34d facing radially outward, the surface of the large diameter section 34a facing the axial direction that faces the stator core 31, and the surface of the stator core 31 facing the axial direction that faces the large diameter section 34a. The accommodation section 39 is located radially inward from the outer peripheral surface of the large diameter section 34a and the outer peripheral surface of the stator core 31. The accommodation section 39 is a hole-shaped recessed radially inward. The accommodation section 39 is composed around the entire circumference.

As shown in FIG. 4, each of the multiple columnar portions 35 is a column extending upward from the annular portion 34. As shown in FIG. 1, each of the multiple columnar portions 35 holds a second circuit board 72 (described later) of the control device 70. As shown in FIG. 4, each of the multiple columnar portions 35 is disposed at approximately equal intervals along the circumferential direction. In this embodiment, twelve columnar portions 35 are provided. The multiple columnar portions 35 include a plurality of first columnar portions 36 and a plurality of second columnar portions 37.

In this embodiment, eight first columnar portions 36 are provided. Each first columnar portion 36 is substantially rectangular. In this embodiment, four second columnar portions 37 are provided. Each second columnar portion 37 is disposed at substantially equal intervals along the circumferential direction. The upper end of each second columnar portion 37 is located above the upper end of the first columnar portion 36. Each second columnar portion 37 has a claw portion 37a. The claw portion 37a is located at the upper end of the second columnar portion 37 and protrudes radially inward.

The coil section 38 is electrically connected to the control device 70 and receives a current from the control device 70. As shown in FIG. 3, the coil section 38 has a plurality of coil body sections 38a, a plurality of coil lead wires 38b, and a plurality of connection wires 38c.

Each of the multiple coil body parts 38a is attached to each tooth housing part 33c. That is, each of the multiple coil body parts 38a is attached to the insulator 32. As a result, each of the multiple coil body parts 38a is attached to the tooth part 31b via the tooth housing part 33c.

The coil lead wires 38b are drawn out from the coil main body 38a upward, i.e., to one axial side (+Z side). In this embodiment, three coil lead wires 38b are provided. The upper end of each coil lead wire 38b is connected to a first circuit board 71 of the control device 70, which will be described later. This electrically connects the control device 70 and the coil section 38.

Each of the multiple connection wires 38c connects a pair of coil body portions 38a to each other. Current flows through each connection wire 38c. This electrically connects the multiple coil body portions 38a to each other. Each connection wire 38c passes circumferentially around the radial outside of the columnar portion 35. As shown in FIG. 5, the portion of each connection wire 38c that is radially outside the columnar portion 35 is disposed inside the groove portion 34b of the annular portion 34.

The control device 70 is electrically connected to an external power source (not shown) and controls the current supplied to the coil portion 38. As shown in FIG. 1, the control device 70 is accommodated inside the housing 11. The control device 70 is disposed above the stator 30. The control device 70 has a first circuit board 71, a second circuit board 72, and a connection member 75.

The first circuit board 71 is disposed on the upper side of the annular portion 34, i.e., on one axial side (+Z side). The first circuit board 71 is accommodated inside the housing 11. A plurality of electronic components (not shown) are attached to the first circuit board 71. As shown in FIG. 3, the first circuit board 71 is a plate extending in a direction perpendicular to the central axis J. In this embodiment, the first circuit board 71 is a circle centered on the central axis J when viewed in the axial direction. The first circuit board 71 may have other shapes, such as a hexagonal shape and an elliptical shape, when viewed in the axial direction. As shown in FIG. 5, in this embodiment, the outer diameter of the first circuit board 71 is the same as the outer diameter of the large diameter portion 34a. As shown in FIG. 3, the first circuit board 71 is provided with a first through hole 71a and a plurality of first connection hole portions 71b.

As shown in FIG. 1, the first through hole 71a is a hole that penetrates the first circuit board 71 in the axial direction. When viewed in the axial direction, the first through hole 71a has a substantially circular shape centered on the central axis J. The shaft 22 is passed through the first through hole 71a in the axial direction.

As shown in FIG. 3, each of the first connection holes 71b is a hole that penetrates the first circuit board 71 in the axial direction. Three first connection holes 71b are provided. Each first connection hole 71b extends at an inclination in the circumferential direction from the outer circumferential surface of the first circuit board 71 toward the radially inward direction. The coil lead wire 38b is passed through each first connection hole 71b in the axial direction. This allows each coil lead wire 38b to be arranged radially inward from the outer circumferential surface of the first circuit board 71. Each first connection hole 71b and each coil lead wire 38b are fixed by solder. This allows the control device 70 to be connected to each coil lead wire 38b. In this embodiment, the control device 70 and each coil lead wire 38b are directly connected without using an intermediate member such as a bus bar. Therefore, it is possible to suppress an increase in the number of parts and manufacturing man-hours of the rotating electric machine 1.

1, the second circuit board 72 is disposed between the annular portion 34 and the first circuit board 71 in the axial direction. The second circuit board 72 is accommodated inside the housing 11. A plurality of electronic components (not shown) are attached to the second circuit board 72. As shown in FIG. 3, the second circuit board 72 is disk-shaped extending in a direction perpendicular to the central axis J. The second circuit board 72 may have other shapes such as a hexagonal shape and an elliptical shape when viewed in the axial direction. As shown in FIG. 5, in this embodiment, the outer diameter of the second circuit board 72 is the same as the outer diameter of the large diameter portion 34a. As shown in FIG. 3, the second circuit board 72 is provided with a second through hole 72a, a plurality of first recesses 72b, and a plurality of second recesses 72e.

As shown in FIG. 1, the second through hole 72a is a hole that penetrates the second circuit board 72 in the axial direction. When viewed in the axial direction, the second through hole 72a has a substantially circular shape centered on the central axis J. The shaft 22 is passed through the second through hole 72a in the axial direction.

As shown in FIG. 3, the first recesses 72b are recessed radially inward from the outer circumferential surface of the second circuit board 72. Although not shown, in this embodiment, three first recesses 72b are provided. Each coil lead wire 38b passes axially through the inside of each first recess 72b. This allows each coil lead wire 38b to be positioned radially inward from the outer circumferential surface of the second circuit board 72.

The second recesses 72e are recessed radially inward from the outer peripheral surface of the second circuit board 72. Although not shown, in this embodiment, four second recesses 72e are provided. The second columnar portion 37 passes axially through the interior of each second recess 72e. The upper surface of the second circuit board 72 contacts the lower surface of the claw portion 37a of each second columnar portion 37. The lower surface of the second circuit board 72 contacts the upper surface of each first columnar portion 36. This determines the axial position of the second circuit board 72. The radially outward surface of each second recess 72e contacts the radially inward surface of each second columnar portion 37. This determines the radial position of the second circuit board 72.

Each of the multiple connection members 75 is disposed between the first circuit board 71 and the second circuit board 72. Although not shown, in this embodiment, three connection members 75 are provided. The upper end of each connection member 75 is fixed to the first circuit board 71. The lower end of each connection member 75 is fixed to the second circuit board 72. This determines the axial position of the first circuit board 71 relative to the second circuit board 72. In this embodiment, the connection member 75 is an inter-board connector that electrically connects the first circuit board 71 and the second circuit board 72. Signals are transmitted and received between the first circuit board 71 and the second circuit board 72 via each connection member 75. In other words, in this embodiment, each connection member 75 plays a role in electrically connecting the first circuit board 71 and the second circuit board 72, and also plays a role in holding the first circuit board 71. Therefore, in this embodiment, there is no need to provide additional members such as fixing members or screws to fix the first circuit board 71 to the insulator 32 or the housing 11, so the number of parts and manufacturing steps for the rotating electric machine 1 can be prevented from increasing.

The sheet member 60 is an insulating band-like member. As shown in FIG. 1, the sheet member 60 is disposed between the annular portion 34, the first circuit board 71, and the second circuit board 72, and the peripheral wall portion 12a of the housing 11 in the radial direction. As shown in FIG. 5, the sheet member 60 is wrapped around the outer peripheral surfaces of the large diameter portion 34a, the second circuit board 72, and the first circuit board 71 along the circumferential direction. The sheet member 60 is fixed to the outer peripheral surfaces of the large diameter portion 34a, the second circuit board 72, and the first circuit board 71. The upper end of the sheet member 60 is wrapped around the outer peripheral surface of the first circuit board 71. The lower end of the sheet member 60 is wrapped around the outer peripheral surface of the annular portion 34. In the following description, the "large diameter portion 34a, the first circuit board 71, and the second circuit board 72" may be referred to as the "large diameter portion 34a, etc.".

As shown in FIG. 5, the sheet member 60 surrounds the connection line 38c housed in the groove portion 34b of the insulator 32 from the radial outside. In other words, according to this embodiment, the sheet member 60 faces the connection line 38c from the radial outside. Therefore, since the sheet member 60 can be disposed between the connection line 38c and the housing 11, the sheet member 60 can ensure insulation between the connection line 38c and the housing 11.

In addition, according to this embodiment, the sheet member 60 surrounds the coil lead wire 38b from the radially outer side. Therefore, the sheet member 60 can be disposed between the coil lead wire 38b and the housing 11, so that the sheet member 60 can ensure insulation between the coil lead wire 38b and the housing 11.

As shown in FIG. 6, in this embodiment, the sheet member 60 is configured by radially overlapping insulating sheets 60a each having an insulating sheet-like base material portion 60b and an adhesive layer 60c provided on the inner peripheral surface of the base material portion 60b. That is, the sheet member 60 is configured by a plurality of base material portions 60b arranged to overlap each other in the radial direction. The plurality of base material portions 60b are fixed to each other via the adhesive layer 60c. In this embodiment, the sheet member 60 is configured by three base material portions 60b arranged to overlap each other in the radial direction. The number of base material portions 60b arranged to overlap each other in the radial direction is not limited to three, and may be one or two, or may be four or more.

Therefore, according to this embodiment, the sheet member 60 is composed of multiple base parts 60b arranged to overlap each other in the radial direction, so that the insulating performance of the sheet member 60 can be improved. Therefore, the sheet member 60 can more preferably ensure insulation between the coil lead wire 38b and the connection wire 38c and the housing 11. Also, according to this embodiment, as described above, the multiple base parts 60b are fixed to each other via the adhesive layer 60c, so that, for example, the base part 60b arranged on the outermost radial side can be prevented from peeling off. Therefore, the insulating performance of the sheet member 60 can be prevented from decreasing, so that the insulation between the coil lead wire 38b and the connection wire 38c and the housing 11 can be more preferably ensured.

According to this embodiment, as described above, the sheet member 60 has an insulating sheet-like base portion 60b and an adhesive layer 60c provided on the inner peripheral surface of the base portion 60b. Therefore, the adhesive layer 60c is exposed on the inner peripheral surface of the sheet member 60, so that the sheet member 60 can be fixed to the outer peripheral surface of the large diameter portion 34a, etc. by adhesion. Therefore, the sheet member 60 can be stably arranged between the coil lead wire 38b and the connection wire 38c and the housing 11, so that the insulation between the coil lead wire 38b and the connection wire 38c and the housing 11 can be more suitably ensured.

In this embodiment, the substrate 60b is made of resin. More specifically, the substrate 60b is made of polyethylene (PE). The material constituting the substrate 60b may be other insulating resin materials such as polytetrafluoroethylene (PTFE) and polypropylene (PP). In this embodiment, the thickness of the substrate 60b is about 25 μm. In this embodiment, the adhesive layer 60c is made of an acrylic adhesive. The adhesive layer 60c may be made of other adhesives such as a urethane adhesive and a silicone adhesive. The thickness of the adhesive layer 60c is about 5 μm. That is, in this embodiment, the sheet member 60 is a thin strip having a thickness of about 100 μm. Therefore, according to this embodiment, the sheet members 60 that are disposed between the insulator 32, the first circuit board 71, and the second circuit board 72 and the housing 11 in the radial direction and ensure insulation between the coil lead wires 38b and the connection wires 38c and the housing 11 are thin strips, so that the dimensions of the radial gaps between the insulator 32, the first circuit board 71, and the second circuit board 72 and the housing 11 can be reduced. This makes it possible to prevent the housing 11 from becoming larger in the radial direction. Therefore, the rotating electric machine 1 can be prevented from becoming larger in the radial direction while ensuring insulation between the coil portion 38 and the housing 11.

In this embodiment, the radial dimension of the storage section 39 is greater than the thickness of the sheet member 60. The axial dimension of the storage section 39 is at least twice the thickness of the sheet member 60. For example, when a 100 μm thick insulating sheet 60a is wrapped around the outer peripheral surface of the large diameter section 34a, etc., three times, the axial dimension of the storage section 39 is at least 600 μm.

Next, in this embodiment, the winding process Pw in which the sheet member 60 is wound around the outer peripheral surface of the large diameter portion 34a, etc. will be described. The winding process Pw is part of the manufacturing process of the rotating electric machine 1. The winding process Pw in this embodiment includes a first process of winding the insulating sheet 60a around the outer peripheral surfaces of the large diameter portion 34a, the first circuit board 71, and the second circuit board 72, and a second process of accommodating at least a part of the lower end of the sheet member 60 inside the accommodating portion 39. In the following description, "workers, etc." includes workers who perform each task and assembly equipment, etc. Each task may be performed by only the worker, by only the assembly equipment, or by both the worker and the assembly equipment.

In the first step, the worker wraps the insulating sheet 60a around the outer peripheral surface of the large diameter portion 34a of the insulator 32. As shown in FIG. 7A, the worker wraps the insulating sheet 60a around the outer peripheral surface of the large diameter portion 34a in the circumferential direction. In this embodiment, the worker wraps the insulating sheet 60a around the outer peripheral surface of the large diameter portion 34a three times. As a result, as described above, the sheet member 60 is composed of three base material portions 60b overlapping each other in the radial direction (see FIG. 6). The upper end of the insulating sheet 60a is adhered to the outer peripheral surface of the first circuit board 71. Note that FIG. 7A shows an arrow that moves the roll of the insulating sheet 60a along the outer peripheral surface of the stator 30. This arrow indicates the relative movement direction of the roll of insulating sheet 60a with respect to the stator 30. By fixing the position of the roll of insulating sheet 60a and rotating the stator 30 around the central axis J, the insulating sheet 60a can be wrapped around the outer peripheral surface of the large diameter portion 34a, etc. in the circumferential direction.

As shown in FIG. 7B, the lower end of the insulating sheet 60a is located below the large diameter portion 34a. This allows the insulating sheet 60a to be adhered to the entire outer peripheral surface of the large diameter portion 34a, and increases the adhesive strength between the sheet member 60 and the outer peripheral surface of the large diameter portion 34a. When an operator wraps the insulating sheet 60a around the outer peripheral surface of the large diameter portion 34a, for example, three times, and the sheet member 60 is fixed to the outer peripheral surface of the large diameter portion 34a, the first step is completed.

According to this embodiment, the first circuit board 71 is circular about the central axis J, and the outer diameter of the first circuit board 71 is the same as the outer diameter of the large diameter portion 34a. Therefore, in the first step, the insulating sheet 60a can be easily wrapped around the outer peripheral surface of the large diameter portion 34a and the outer peripheral surface of the first circuit board 71 at the same time, which improves the work efficiency of the first step. Therefore, an increase in the number of steps in the winding step Pw can be suppressed.

According to this embodiment, the second circuit board 72 is disk-shaped with the central axis J as its center, the outer diameter of the second circuit board 72 is the same as the outer diameter of the large diameter portion 34a, and the sheet member 60 is wrapped around the outer peripheral surface of the second circuit board 72. Therefore, in the first step, the insulating sheet 60a can be easily wrapped around the outer peripheral surface of the large diameter portion 34a and the outer peripheral surface of the second circuit board 72 at the same time, thereby improving the work efficiency of the first step. Therefore, an increase in the number of steps in the winding step Pw can be suppressed.

In the second step, at least a portion of the lower end of the sheet member 60, i.e., the other axial end (-Z side), is accommodated inside the accommodation section 39. As described above, when the insulating sheet 60a is wound, the lower end of the insulating sheet 60a is located below the large diameter portion 34a. Therefore, as shown in FIG. 7B, a portion of the lower end of the sheet member 60 may reach the outer peripheral surface of the stator core 31. As shown in FIG. 7C, the worker pushes the portion of the sheet member 60 below the large diameter portion 34a into the accommodation section 39. As a result, the portion of the sheet member 60 below the large diameter portion 34a, including the lower end, is accommodated inside the accommodation section 39.

According to this embodiment, the radial dimension of the storage section 39 is greater than the thickness of the sheet member 60. Therefore, the sheet member 60 can be stored inside the storage section 39.

According to this embodiment, the axial dimension of the storage section 39 is more than twice the thickness of the sheet member 60. Therefore, as shown in FIG. 7C, the sheet member 60 can be folded in the axial direction and stacked in the axial direction to be stored inside the storage section 39, so that the axial dimension of the sheet member 60 that can be stored in the storage section 39 can be increased. More specifically, the axial dimension of the sheet member 60 that can be stored in the storage section 39 can be about twice the radial dimension of the storage section 39. Therefore, in the second step, the lower end of the sheet member 60 can be easily stored inside the storage section 39, so that an increase in the number of steps in the winding step Pw can be suppressed.

The inner circumferential surface of the portion of the sheet member 60 that is housed inside the housing portion 39 may be brought into contact with the inner surface of the housing portion 39 and fixed via an adhesive layer 60c. This makes it possible to prevent the portion of the sheet member 60 that is housed inside the housing portion 39 from moving outside the housing portion 39.

When the worker or the like stores at least a portion of the lower end of the sheet member 60 inside the storage section 39, the second step is completed and the winding step Pw is also completed.

Next, the stator fixing process Ps, in which the stator 30 wrapped with the sheet member 60 is fixed to the housing member 12 of the housing 11, will be described. The stator fixing process Ps is part of the manufacturing process of the rotating electric machine 1. As shown in FIG. 7D, an operator inserts the stator 30 into the housing member 12 through the opening 12d of the housing member 12 fixed to a jig or the like. At this time, the stator 30 is inserted into the housing member 12 while the outer peripheral surface of the stator core 31 contacts the inner peripheral surface of the peripheral wall portion 12a of the housing member 12. As shown in FIG. 1, the stator 30 is inserted into the housing member 12 until the radial outer edge of the surface facing downward of the stator core 31 contacts the step surface 12f of the housing member 12 in the axial direction, and the stator fixing process Ps is completed.

According to this embodiment, a portion of the sheet member 60 is wound around the outer peripheral surface of the large diameter portion 34a in the circumferential direction, and at least a portion of the lower end of the sheet member 60, i.e., the other axial side (-Z side), can be accommodated inside the accommodation portion 39. Therefore, in the stator fixing process Ps, when the stator 30 is inserted into the housing member 12, the sheet member 60 can be prevented from being pinched between the outer peripheral surface of the stator core 31 and the inner peripheral surface of the peripheral wall portion 12a. Therefore, since the pressing force applied to the stator 30 when inserting the stator 30 into the housing member 12 can be prevented from increasing, the stator 30 can be easily inserted into the housing member 12, and the number of steps in the stator fixing process Ps can be prevented from increasing. In addition, since the sheet member 60 can be prevented from being pinched between the stator core 31 and the peripheral wall portion 12a, the radial positional accuracy of the stator core 31 relative to the housing 11 can be improved, and the operation of the rotating electric machine 1 can be stabilized.

In addition, in this embodiment, at least a portion of the lower end of the sheet member 60 can be accommodated inside the accommodation portion 39. Therefore, when the stator 30 is inserted into the housing member 12 in the stator fixing process Ps, the lower end of the sheet member 60 is caught on the upper end of the peripheral wall portion 12a and the inner peripheral surface of the peripheral wall portion 12a, thereby preventing the sheet member 60 from peeling off from the large diameter portion 34a, etc. Therefore, the sheet member 60 can be stably arranged between each of the coil lead wires 38b and the connection wires 38c and the housing 11, and therefore the insulation between each of the coil lead wires 38b and the connection wires 38c and the housing 11 can be stably ensured.

In addition, in this embodiment, even if the lower end of the sheet member 60 reaches the outer peripheral surface of the stator core 31 in the first step of the winding process Pw in which the sheet member 60 is wound around the outer peripheral surface of the large diameter portion 34a, etc., in the second step, the lower end of the sheet member 60 can be accommodated in the accommodation portion 39. Therefore, since it is not necessary to determine the position of the lower end of the sheet member 60 with respect to the stator core 31 with high precision in the first step, the work in the first step can be simplified. Therefore, an increase in the number of steps in the winding process Pw can be suppressed.

In addition, in this embodiment, as shown in FIG. 5, the sheet member 60 can be hooked on the edge portion 34f, which is the portion where the outer peripheral surface of the large diameter portion 34a and the surface facing downward of the large diameter portion 34a are connected. This makes it difficult for the sheet member 60 to separate from the edge portion 34f, and therefore can more effectively prevent the sheet member 60 from peeling off the insulator 32.

Second Embodiment
Fig. 8 is a cross-sectional view showing a part of a rotating electric machine 201 according to the second embodiment. Fig. 9 is a cross-sectional view showing another part of a rotating electric machine 201 according to the second embodiment. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

9, the insulator 232 of this embodiment has a second annular portion (annular portion) 234. In this embodiment, the shape of the second annular portion 234 is plane-symmetrical to the shape of the annular portion 34 shown in FIG. 8, with a plane perpendicular to the central axis J as the plane of symmetry. That is, the insulator 232 of this embodiment has the annular portion 34 on the upper side (+Z side) of the stator core 31, and the second annular portion 234 on the lower side (-Z side) of the stator core 31. In the following description, the upper annular portion 34 may be referred to as the first annular portion 34 in correspondence with the second annular portion 234. Following this example, each portion of the first annular portion 34 may be referred to as the first large diameter portion 34a, the first small diameter portion 34d, and the first housing portion 39. Furthermore, the sheet member 60 wrapped around the first large diameter portion 34a may be referred to as the first sheet member 60.

The second annular portion 234 is annular about the central axis J. The second annular portion 234 is disposed below the stator core 31. The second annular portion 234 covers at least a portion of the lower side of the stator core 31. That is, the second annular portion 234 covers at least a portion of the stator core 31 in the axial direction. The upper end of the second annular portion 234 is in axial contact with the surface of the stator core 31 facing the lower side. The second annular portion 234 has a second large diameter portion 234a and a second small diameter portion 234d.

The second large diameter portion (large diameter portion) 234a is annular about the central axis J. A groove portion 234b is provided in the second large diameter portion 234a. The groove portion 234b is recessed radially inward from the outer circumferential surface of the second large diameter portion 234a. The groove portion 234b is provided around the entire circumference along the outer circumferential surface of the second large diameter portion 234a.

The second small diameter portion (small diameter portion) 234d is annular about the central axis J. In the axial direction, the second small diameter portion 234d is disposed between the second large diameter portion 234a and the stator core 31. The second small diameter portion 234d is axially connected to the upper end of the second large diameter portion 234a. The surface of the second small diameter portion 234d facing upward is in contact with the surface of the stator core 31 facing downward.

The multiple connection wires 238c of the coil portion 238 in this embodiment are arranged below the stator core 31. Each connection wire 238c connects a pair of coil body portions 38a. A current flows through the connection wires 238c. Each connection wire 238c is arranged inside the groove portion 234b of the second annular portion 234. As shown in FIG. 8, in this embodiment, the connection wires 238c are not provided on the upper side of the stator core 31. As in the first embodiment described above, in this embodiment, the sheet member 60 surrounds the coil lead wire 38b from the radial outside. Therefore, the sheet member 60 can ensure insulation between the coil lead wire 38b and the housing 11.

As shown in FIG. 9, the stator 230 of this embodiment has a second housing portion (housing portion) 239. The second housing portion 239 is composed of a surface of the second small diameter portion 234d facing radially outward, a surface of the second large diameter portion 234a facing upward, and a surface of the stator core 31 facing downward. That is, the second housing portion 239 is composed of a surface of the second small diameter portion 234d facing radially outward, a surface of the second large diameter portion 234a facing the axial direction that faces the stator core 31, and a surface of the stator core 31 facing the second large diameter portion 234a. The second housing portion 239 is a hole-shaped recessed radially inward. The second housing portion 239 is composed around the entire circumference in the circumferential direction. In addition, the radial and axial dimensions of the second storage section 239 in this embodiment are the same as the radial and axial dimensions of the storage section 39 in the first embodiment described above.

The rotating electric machine 201 of this embodiment has a second sheet member (sheet member) 260. The second sheet member 260 is a strip-shaped member having insulating properties. Although not shown, the second sheet member 260 is disposed between the second annular portion 234 and the peripheral wall portion 12a of the housing 11 in the radial direction. The second sheet member 260 is wound around the outer peripheral surface of the second large diameter portion 234a along the circumferential direction. The second sheet member 260 is fixed to the outer peripheral surface of the second large diameter portion 234a. At least a part of the portion above the second large diameter portion 234a, including the upper end portion of the second sheet member 260, is accommodated inside the second accommodation portion 239. The configuration of the second sheet member 260, except for the axial dimension, is the same as the configuration of the sheet member 60 of the first embodiment described above, except for the axial dimension.

According to this embodiment, the second sheet member (sheet member) 260 faces the connection line 238c housed in the groove portion 234b of the insulator 232 from the radially outer side. Therefore, the second sheet member 260 can be disposed between the connection line 238c and the housing 11, so that the second sheet member 260 can ensure insulation between the connection line 238c and the housing 11.

Similar to the sheet member 60 of the first embodiment described above, the second sheet member 260 of this embodiment is a thin strip with a thickness of about 100 μm. Therefore, according to this embodiment, the second sheet member 260, which is disposed between the insulator 232 and the housing 11 in the radial direction and ensures insulation between the connection wire 238c and the housing 11, is a thin strip, so that the dimension of the radial gap between the insulator 232 and the housing 11 can be reduced. This makes it possible to prevent the housing 11 from becoming larger in the radial direction. Therefore, it is possible to prevent the rotating electric machine 201 from becoming larger in the radial direction while ensuring insulation between the coil portion 238 and the housing 11.

According to this embodiment, the stator 230 has a first accommodating portion 39 and a second accommodating portion 239. The insulator 32 also has a first annular portion 34 and a second annular portion 234. The first annular portion 34 has a first small diameter portion 34d and a first large diameter portion 34a. The second annular portion 234 has a second small diameter portion 234d and a second large diameter portion 234a. The first accommodating portion 39 is formed by a surface facing radially outward of the first small diameter portion 34d, a surface facing the other axial side (-Z side) of the first large diameter portion 34a, and a surface facing one axial side (+Z side) of the stator core 31. The second accommodating portion 239 is formed by a surface facing radially outward of the second small diameter portion 234d, a surface facing one axial side of the second large diameter portion 234a, and a surface facing the other axial side of the stator core 31. The other axial end of the first sheet member 60 can be accommodated in the first accommodation portion 39, and the one axial end of the second sheet member 260 can be accommodated in the second accommodation portion 239. According to this embodiment, when the sheet members 60, 260 are wound around the stator core 31 on both axial sides to ensure insulation between the coil portion 238 and the housing 11, each of the sheet members 60, 260 can be prevented from being pinched between the outer peripheral surface of the stator core 31 and the inner peripheral surface of the peripheral wall portion 12a.

The present invention is not limited to the above-described embodiment, and other configurations and methods may be adopted within the scope of the technical concept of the present invention. For example, the accommodating portion may be a recess recessed radially inward from the outer circumferential surface of the annular portion. In addition, the accommodating portion does not need to be provided all around the circumference, and may be provided only in the portion that accommodates the connection line.

If the sheet member can be wrapped around it, the outer diameter of the first circuit board and the outer diameter of the second circuit board do not have to be the same as the outer diameter of the large diameter portion. The outer diameter of the first circuit board and the outer diameter of the second circuit board may be larger or smaller than the outer diameter of the large diameter portion. In addition, the sheet member does not have to be wrapped around the outer peripheral surface of the second circuit board.

If the connection portion can be positioned radially inward of the sheet member, the connection portion does not need to be positioned inside the groove portion. In this case, the groove portion does not need to be provided.

The configuration of the sheet member is not limited to that of the above embodiment, and for example, an adhesive layer may not be provided. In this case, adhesive may be applied to the outer peripheral surfaces of the large diameter portion, the first circuit board, and the second circuit board, and the sheet member may be fixed to each of the large diameter portion, the first circuit board, and the second circuit board via the adhesive.

Although the embodiments of the present invention have been described above, the use of the rotating electric machine to which the present invention is applied is not particularly limited. The rotating electric machine is not limited to a motor, but may be a generator. Each configuration and their combinations in the embodiments of the present invention are merely examples, and additions, omissions, substitutions, and other modifications of the configurations are possible without departing from the spirit of the present invention.

The present technology can be configured as follows.
(1) A rotor rotatable about a central axis, a stator disposed radially outward of the rotor and facing the rotor with a gap therebetween, a band-shaped insulating sheet member, and a housing that accommodates the rotor, the stator, and the sheet member therein, wherein the stator has a stator core whose outer circumferential surface is fixed to the housing, an insulator having an annular portion that covers at least a portion of the stator core in the axial direction, and an accommodating portion, the annular portion having an annular large diameter portion centered on the central axis, and an insulator disposed between the large diameter portion and the stator core in the axial direction. a rotating electric machine having a sheet member and an annular small diameter portion centered on the central axis, the small diameter portion being axially connected to the large diameter portion, an outer diameter of the large diameter portion being smaller than an outer diameter of the stator core and larger than an outer diameter of the small diameter portion, the accommodating portion being constituted by a radially outward surface of the small diameter portion, an axially facing surface of the large diameter portion that faces the stator core, and an axially facing surface of the stator core that faces the large diameter portion, a portion of the sheet member being wrapped circumferentially around an outer peripheral surface of the large diameter portion, and at least a portion of the sheet member being capable of being accommodated inside the accommodating portion.
(2) A rotating electric machine as described in (1), further comprising: a first circuit board disposed on one axial side of the annular portion and extending in a direction perpendicular to the central axis, the first circuit board being accommodated inside the housing, the stator having a coil portion having a plurality of coil main bodies attached to the insulator and coil lead wires drawn from the coil main bodies to one axial side and connected to the first circuit board, the sheet member being wound around an outer circumferential surface of the first circuit board, and the sheet member surrounding the coil lead wires from the radial outside.
(3) The rotating electric machine according to (2), wherein the first circuit board is circular about the central axis, and the first circuit board has a dimension equal to an outer diameter of the large diameter portion.
(4) The rotating electric machine according to (2) or (3), further comprising a disk-shaped second circuit board that is disposed between the stator core and the first circuit board in the axial direction and is centered on the central axis, an outer diameter dimension of the second circuit board is the same as an outer diameter dimension of the large diameter portion, and the sheet member is wrapped around an outer peripheral surface of the second circuit board.
(5) The rotating electric machine according to any one of (1) to (4), wherein the large diameter portion has a groove portion recessed radially inward from a surface of the large diameter portion facing radially outward, an electrical connection wire is disposed inside the groove portion, and the sheet member faces the connection wire from the radial outside.
(6) The rotating electric machine according to any one of (1)1 to (5), wherein the sheet member has an insulating sheet-like base portion and an adhesive layer provided on an inner circumferential surface of the base portion.
(7) The rotating electric machine according to (6), wherein the sheet member is configured by a plurality of the base portions arranged to overlap each other in the radial direction, and the plurality of base portions are fixed to each other via the adhesive layer.
(8) The rotating electric machine according to any one of (1) to (7), wherein a radial dimension of the housing portion is greater than a thickness of the sheet member.
(9) The rotating electric machine according to any one of (1) to (8), wherein an axial dimension of the housing portion is equal to or greater than twice the thickness of the sheet member.

1,201... rotating electric machine, 11... housing, 20... rotor, 30,230... stator, 31... stator core, 31a... core back portion, 31b... teeth portion, 32,232... insulator, 33c... teeth accommodating portion, 34... annular portion, 234... second annular portion (annular portion), 34a... large diameter portion, 234a... second large diameter portion (large diameter portion), 34b, 234b... groove portion, 34d... Small diameter portion, 234d... second small diameter portion (small diameter portion), 38, 238... coil portion, 38a... coil body portion, 38b... coil lead wire, 38c, 238c... connection wire, 39... accommodation portion, 239... second accommodation portion (accommodation portion), 60... sheet member, 260... second sheet member (sheet member), 60b... substrate portion, 60c... adhesive layer, 71... first circuit board, 72... second circuit board, J... center axis

Claims (9)

A rotor rotatable about a central axis;
a stator disposed radially outside the rotor and facing the rotor with a gap in between;
a belt-shaped sheet member having insulating properties;
a housing that accommodates the rotor, the stator, and the sheet member therein;
Equipped with
The stator includes:
a stator core having an outer circumferential surface fixed to the housing;
an insulator having an annular portion that axially covers at least a portion of the stator core;
A storage section;
having
the annular portion has an annular large diameter portion centered on the central axis, and an annular small diameter portion disposed between the large diameter portion and the stator core in the axial direction and centered on the central axis,
the small diameter portion is axially connected to the large diameter portion,
an outer diameter of the large diameter portion is smaller than an outer diameter of the stator core and larger than an outer diameter of the small diameter portion;
the housing portion is configured by a radially outward surface of the small diameter portion, an axially facing surface of the large diameter portion that faces the stator core, and an axially facing surface of the stator core that faces the large diameter portion,
A rotating electric machine in which a portion of the sheet member is wrapped around an outer circumferential surface of the large diameter portion in a circumferential direction, and at least a portion of the sheet member is capable of being accommodated inside the accommodation portion. a first circuit board disposed on one axial side of the annular portion and extending in a direction perpendicular to the central axis;
the first circuit board is accommodated within the housing;
the stator has a coil portion including a plurality of coil body portions attached to the insulator and coil lead wires drawn from the coil body portions to one side in the axial direction and connected to the first circuit board;
the sheet member is wrapped around an outer circumferential surface of the first circuit board,
The rotating electric machine according to claim 1 , wherein the sheet member surrounds the coil lead wire from a radially outer side. the first circuit board has a circular shape centered on the central axis,
The rotating electric machine according to claim 2 , wherein the first circuit board has the same outer diameter as the large diameter portion. a second circuit board having a disk shape and centered on the central axis, the second circuit board being disposed between the stator core and the first circuit board in the axial direction,
an outer diameter of the second circuit board is the same as an outer diameter of the large diameter portion;
The rotating electric machine according to claim 2 , wherein the sheet member is wrapped around an outer circumferential surface of the second circuit board. the large diameter portion has a groove portion recessed radially inward from a surface of the large diameter portion facing radially outward,
A connecting wire that conducts electricity is disposed inside the groove,
The rotating electric machine according to claim 1 , wherein the sheet member faces the connection wire from a radially outer side. The rotating electric machine according to any one of claims 1 to 4, wherein the sheet member has an insulating sheet-like base material and an adhesive layer provided on the inner circumferential surface of the base material. The sheet member is formed of a plurality of the base members arranged to overlap each other in a radial direction,
The rotating electric machine according to claim 6 , wherein the plurality of base members are fixed to each other via the adhesive layer. The rotating electric machine according to any one of claims 1 to 4, wherein the radial dimension of the housing portion is greater than the thickness of the sheet member. The rotating electric machine according to any one of claims 1 to 4, wherein the axial dimension of the housing portion is at least twice the thickness of the sheet member.

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