Rotating electric machine

Abstract

To provide a rotary electric machine that can inhibit sparks from reaching the outside of a housing.SOLUTION: A rotary electric machine according to one embodiment comprises a stator, a rotor, a shaft, and a housing. The housing has a first member and a second member. The first member includes: an inner peripheral surface in which a first hole is provided and which is oriented to an inner side of the first hole; a first bonding surface which is connected to an end of the inner peripheral surface in a first direction and in which a second hole into which a bolt is fitted is provided; and a first surface which is connected to the end of the inner peripheral surface in a second direction. The second member includes: an outer peripheral surface which is fitted into the first hole and faces the inner peripheral surface; a second bonding surface which faces the first bonding surface and in which a third hole to which the bolt is fitted is provided; and a second surface which faces the first surface.SELECTED DRAWING: Figure 1

Description

【Technical Field】 【0001】 Embodiments of the present invention generally relate to rotating electrical machines. 【Background Art】 【0002】 A rotating electrical machine generally has a stator, a rotor, and a housing that houses the stator and the rotor. The housing includes a plurality of members coupled to each other. A rotating electrical machine called a pressure-resistant explosion-proof motor, which is a type of explosion-proof motor (also called a hazardous area motor), is designed to prevent sparks from reaching the outside of the housing through gaps when an explosion occurs inside the rotating electrical machine. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Utility Model Publication No. 61-104750 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 When the volume of the housing is large, an explosion inside the housing may cause pressure buildup. An explosion accompanied by pressure buildup increases the momentum of the sparks trying to pass through the gaps between the members. 【Means for Solving the Problems】 【0005】 A rotating electric machine according to one embodiment comprises a stator, a rotor, a shaft, and a housing. The rotor is rotatable inside the stator. The shaft is rotatable together with the rotor. The housing has a first member, a second member, and bolts connecting the first member and the second member to each other, and is provided with a chamber in which the stator and the rotor are housed. The first member has a first hole that penetrates the first member in a first direction and connects the chamber to the outside of the housing, an inner circumferential surface facing inward through the first hole, a first joining surface connected to the end of the inner circumferential surface in the first direction and facing in a direction intersecting the direction in which the inner circumferential surface faces, and having a second hole into which the bolts are fitted, and a first surface connected to the end of the inner circumferential surface in a second direction opposite to the first direction and facing in a direction intersecting the direction in which the inner circumferential surface faces. The second member is fitted into the first hole and has an outer surface facing the inner surface, a second joining surface connected to the end of the outer surface in the first direction and facing the first joining surface, and having a third hole into which the bolt is fitted, and a second surface connected to the end of the outer surface in the second direction and facing the first surface. The second surface is provided on a second projection that protrudes from the outer peripheral surface. [Brief explanation of the drawing] 【0006】 [Figure 1] Figure 1 is a schematic cross-sectional view showing an electric motor according to one embodiment. [Figure 2] Figure 2 is a cross-sectional view showing the frame and bracket of the above embodiment. [Figure 3] Figure 3 is a cross-sectional view showing the bracket and oil drain of the above embodiment. [Figure 4] Figure 4 is a cross-sectional view showing the frame and terminal board of the above embodiment. [Modes for carrying out the invention] 【0007】 An embodiment will be described below with reference to Figures 1 to 4. Note that in this specification, the components of an embodiment and their descriptions may be described using multiple expressions. The components and their descriptions are examples and are not limited by the expressions used herein. Components may also be identified by names different from those used herein. Furthermore, components may also be described using expressions different from those used herein. 【0008】 Figure 1 is a schematic cross-sectional view showing the electric motor 10 according to this embodiment. The electric motor 10 is an example of a rotating electric machine. The electric motor 10 is, for example, an explosion-proof motor. The rotating electric machine may be other rotating electric machines such as a generator. As shown in Figure 1, the electric motor 10 has a stator 11, a rotor 12, a shaft 13, a housing 14, two bearings 15, and a terminal box 16. 【0009】 The stator 11, rotor 12, and a portion of the shaft 13 are housed inside the housing 14. The rotor 12 is driven by the current flowing through the windings of the stator 11 and rotates around the rotation axis Ax. The shaft 13 is attached to the rotor 12 and rotates together with the rotor 12. The rotation axis Ax is, for example, the centerline of the shaft 13. Figure 1 shows a cross-section of the electric motor 10 parallel to the rotation axis Ax so as to include the rotation axis Ax of the shaft 13. 【0010】 In the following explanation, for convenience, the direction along the rotation axis Ax of shaft 13 is defined as the axial direction. Furthermore, the direction perpendicular to the rotation axis Ax is defined as the radial direction, and the direction of rotation around the rotation axis Ax is defined as the circumferential direction. 【0011】 The stator 11 is formed in a substantially cylindrical shape that extends in the axial direction. The stator 11 is fixed to the housing 14. The stator 11 has, for example, a stator core made of a magnetic material and windings attached to the stator core. 【0012】 The rotor 12 is formed in a substantially cylindrical shape extending in the axial direction and is positioned substantially concentrically with the stator 11. The rotor 12 is positioned inside the stator 11 with a gap in between. The rotor 12 has, for example, a plurality of permanent magnets. 【0013】 The stator 11 and rotor 12 are not limited to the above configuration, as long as they can generate rotational force by electromagnetic force. For example, the rotor 12 may have a rotor core made of a magnetic material and a conductor attached to the rotor core. 【0014】 The shaft 13 is formed in a substantially cylindrical shape that extends in the axial direction. Part of the shaft 13 is located inside the housing 14. The other part of the shaft 13 is located outside the housing 14. Outside the housing 14, an external device, for example, is connected to the shaft 13. The rotation of the shaft 13 drives the external device. 【0015】 The housing 14 is made of metal, for example, and is formed in a box shape. However, the housing 14 may be made of other materials. The housing 14 has a frame 21, two brackets 22, two oil drains 23, two terminal boards 24, a plurality of first bolts 25, a plurality of second bolts 26, and a plurality of third bolts 27. The oil drains 23 are an example of a wall. The first bolts 25, second bolts 26, and third bolts 27 are each examples of bolts. 【0016】 A room 30 is provided inside the housing 14. The room 30 is a roughly cylindrical space extending in the axial direction. The room 30 is surrounded by the frame 21 and two brackets 22. The room 30 may have other shapes. The stator 11, the rotor 12, and a part of the shaft 13 are housed in the room 30. 【0017】 The frame 21 is formed in a substantially cylindrical shape extending in the axial direction. Note that the frame 21 may have other shapes. The room 30 is provided inside the frame 21 and surrounded by the frame 21. The frame 21 surrounds the stator 11 and the rotor 12. The frame 21 is arranged substantially concentrically with the stator 11 and the rotor 12. The frame 21 is fixed to the stator 11. 【0018】 The bracket 22 is formed in a plate shape intersecting the axial direction. Two brackets 22 are coupled to both end portions 21a of the frame 21 in the axial direction by a plurality of first bolts 25. Thereby, the bracket 22 closes the end portion 21a of the frame 21. The stator 11 and the rotor 12 are located between the two brackets 22 in the axial direction. 【0019】 Insertion holes 31 are provided in each of the two brackets 22. The insertion holes 31 penetrate the bracket 22 in the axial direction. The insertion holes 31 communicate the room 30 with the outside of the housing 14. Note that the insertion holes 31 may not communicate the room 30 with the outside of the housing 14 alone. For example, the insertion holes 31 may be provided in the middle of a passage that alone communicates the room 30 with the outside of the housing 14. The shaft 13 is arranged to pass through the insertion holes 31. In other words, the shaft 13 penetrates the bracket 22 in the axial direction. 【0020】 The oil shield 23 is formed in a plate shape intersecting the axial direction. Two oil shields 23 are located inside the housing 14 rather than the brackets 22. Each of the two oil shields 23 is coupled to the corresponding bracket 22 by a plurality of second bolts 26. <着 【0021】 Insertion holes 32 are provided in each of the two oil shields 23. The insertion holes 32 penetrate the oil shield 23 in the axial direction. The insertion holes 32 are provided substantially concentrically with the insertion holes 31 of the bracket 22. The shaft 13 is arranged to pass through the insertion holes 32. In other words, the shaft 13 penetrates the oil shield 2 in the axial direction. 【0022】 A bearing chamber 33 is provided between a bracket 22 and an oil separator 23 coupled to the bracket 22. The bearing chamber 33 communicates with an insertion hole 31 of the bracket 22 and an insertion hole 32 of the oil separator 23. 【0023】 The bearing 15 is located in the bearing chamber 33. The bearing 15 is, for example, attached to the bracket 22 in the bearing chamber 33. The bearing 15 supports the shaft 13 so as to be rotatable about the rotation axis Ax. 【0024】 An oil passage 34 is provided in each of the two brackets 22. The oil passage 34 communicates the bearing chamber 33 with the outside of the housing 14. The bearing chamber 33 can be supplied with a lubricant through the oil passage 34. 【0025】 Each of the two terminal boards 24 has a cover 35 and a plurality of terminals 36. The cover 35 is formed in a plate shape and is coupled to the frame 21 by a plurality of third bolts 27. The terminal 36 is a conductor passing through the cover 35. The terminal 36 is electrically connected to the stator 11, for example, via wiring. The terminal 36 may be electrically connected to other components such as a sensor disposed in the room 30. 【0026】 The terminal box 16 is located outside the housing 14. The terminal box 16 is electrically connected to the terminal 36 of the terminal board 24. Therefore, the terminal box 16 is electrically connected to the stator 11 via the terminal 36. 【0027】 The frame 21, the bracket 22, the oil separator 23, and the terminal board 24 are coupled to each other by a mortise joint. The mortise joint is also called an inro. In the mortise joint, a protrusion or a plug provided on one member is fitted into a recess or a hole provided on the other member. Note that the frame 21, the bracket 22, the oil separator 23, and the terminal board 24 may be coupled to each other by other methods. 【0028】 The enclosure 14 further has an inner surface 40. The inner surface 40 faces inward. The inner surface 40 forms (or defines, or partitions) a room 30. In other words, the inner surface 40 is the surface of the enclosure 14 exposed to the room 30. 【0029】 Each of the frame 21, bracket 22, oil drain 23, and terminal board 24 includes a portion of the inner surface 40. Therefore, the inner surface 40 has a portion inner surface 41 included in the frame 21, a portion inner surface 42 included in the bracket 22, a portion inner surface 43 included in the oil drain 23, and a portion inner surface 44 included in the terminal board 24. Each of the portion inner surfaces 41 to 44 is a part of the inner surface 40 and forms (defines or partitions) a portion of the room 30. 【0030】 Figure 2 is a cross-sectional view showing the frame 21 and bracket 22 of this embodiment. In the example shown in Figure 2, the frame 21 is an example of a first member, and the bracket 22 is an example of a second member. 【0031】 The frame 21 is provided with two fitting openings 51. The two fitting openings 51 are located at both ends 21a of the frame 21 and connect the room 30 to the outside of the housing 14. The fitting openings 51 are an example of a first hole. 【0032】 In this embodiment, the mating opening 51 is part of the internal space of the frame 21. However, the mating opening 51 can also be described as penetrating the end 21a of the frame 21 in the axial direction. The axial direction is an example of a first direction. The internal space of the frame 21 includes the chamber 30 and the mating opening 51. 【0033】 The frame 21 has an inner circumferential surface 52, a joint surface 53, and a stepped surface 54. The joint surface 53 is an example of a first joint surface. The stepped surface 54 is an example of a first surface. 【0034】 The inner circumferential surface 52 is a substantially cylindrical curved surface extending in the axial direction. The inner circumferential surface 52 forms (defines or partitions) at least a portion of the fitting opening 51. The inner circumferential surface 52 faces radially inward. In other words, the inner circumferential surface 52 faces inward of the fitting opening 51. 【0035】 The joint surface 53 is provided, for example, at the end 21a of the frame 21 in the axial direction. The joint surface 53 may be provided at other locations. The joint surface 53 is connected to the end of the inner circumferential surface 52 in the outer axial direction Dxo. The outer axial direction Dxo is the direction toward the outside of the housing 14 in the axial direction and is included in the axial direction. The outer axial direction Dxo is an example of a first direction. 【0036】 The joint surface 53 is, for example, a substantially annular plane extending radially outward from the end of the inner circumferential surface 52. The joint surface 53 faces outward in the axial direction Dxo. Outward in the axial direction Dxo is perpendicular to the direction in which the inner circumferential surface 52 faces. Outward in the axial direction Dxo is an example of a direction that intersects with the direction in which the inner circumferential surface faces. The joint surface 53 may also face other directions that intersect with the direction in which the inner circumferential surface 52 faces. 【0037】 A bolt hole 55 is provided in the joint surface 53. In other words, the frame 21 is provided with a bolt hole 55 that opens at the joint surface 53. The bolt hole 55 is an example of a second hole. The bolt hole 55 extends axially from the joint surface 53. A female thread is formed on the inner surface of the bolt hole 55. The female thread of the bolt hole 55 can be fitted onto the male thread of the first bolt 25. 【0038】 The stepped surface 54 is provided, for example, at a position spaced inward in the axial direction Dxi from the joint surface 53. The inward axial direction Dxi is the direction toward the interior of the housing 14 in the axial direction and is included in the axial direction. The inward axial direction Dxi is the opposite direction to the outward axial direction Dxo and is an example of a second direction. 【0039】 The end 54a of the stepped surface 54 on the radially outward side is connected to the end of the inner circumferential surface 52 on the axially inward side Dxi. End 54a is an example of a first end. The end 54b of the stepped surface 54 on the radially inward side is connected to the edge 41a of the partial inner surface 41 of the frame 21. End 54b is located on the opposite side of end 54a. End 54b is an example of a second end. Edge 41a is an example of a first edge. 【0040】 The stepped surface 54 is, for example, a substantially annular plane extending radially inward from the end of the inner circumferential surface 52. The stepped surface 54 faces outward in the axial direction Dxo. Therefore, the stepped surface 54 intersects with the axial direction. The stepped surface 54 may also face in a direction other than the direction that the inner circumferential surface 52 faces. The direction that the stepped surface 54 faces may be different from the direction that the joint surface 53 faces. 【0041】 The length of the stepped surface 54 in the radial direction is shorter than the length of the inner circumferential surface 52 in the axial direction. In other words, the distance between the ends 54a and 54b of the stepped surface 54 is shorter than the distance between the joint surface 53 and the stepped surface 54. 【0042】 The frame 21 further has a step 56. The step 56 is an example of a first projection. The step 56 can be described as projecting radially inward from the inner circumferential surface 52. The step 56 is spaced axially inward Dxi from the end 21a of the frame 21. A stepped surface 54 is provided on the step 56. 【0043】 The bracket 22 has a plug portion 61 and a flange 62. The plug portion 61 is formed in a substantially cylindrical shape and is fitted into a fitting opening 51. The fitting opening 51 is a part of the internal space of the frame 21 into which the plug portion 61 is fitted. The plug portion 61 has an outer peripheral surface 63 and an end surface 64. The end surface 64 is an example of a second surface. 【0044】 The outer circumferential surface 63 is a roughly cylindrical curved surface extending in the axial direction. The diameter of the outer circumferential surface 63 is equal to or slightly shorter than the diameter of the inner circumferential surface 52. Also, in the axial direction, the length of the outer circumferential surface 63 is approximately equal to the length of the inner circumferential surface 52. 【0045】 The outer circumferential surface 63 faces radially outward. The outer circumferential surface 63 faces the inner circumferential surface 52. The outer circumferential surface 63 may be in contact with the inner circumferential surface 52, or it may be slightly separated from the inner circumferential surface 52. The outer circumferential surface 63 and the inner circumferential surface 52 are arranged substantially concentrically and substantially parallel to each other. 【0046】 The end face 64 is provided at the end of the plug portion 61 on the inner axial direction Dxi. The end face 64 may be provided at other positions. The end 64a of the end face 64 on the radially outer side is connected to the end of the outer peripheral surface 63 on the inner axial direction Dxi. The end 64b of the end face 64 on the radially inner side is connected to the edge 42a of the partial inner surface 42 of the bracket 22. The edge 42a is an example of a second edge. 【0047】 The end face 64 is, for example, a substantially annular plane extending radially inward from the end of the outer circumferential surface 63. The end face 64 faces inward in the axial direction Dxi. Therefore, the end face 64 intersects with the axial direction. The end face 64 may also face in other directions that intersect with the direction in which the inner circumferential surface 52 faces. 【0048】 The end face 64 faces the stepped surface 54. The end face 64 may be in contact with the stepped surface 54, or it may be slightly separated from the stepped surface 54. The end face 64 and the stepped surface 54 are arranged substantially concentrically and substantially parallel to each other. 【0049】 The flange 62 protrudes radially outward from the plug portion 61 and covers the joint surface 53 of the frame 21. The flange 62 has a joint surface 65. The joint surface 65 is an example of a second joint surface. The joint surface 65 is provided, for example, at the end of the flange 62 on the axial inner side Dxi. The joint surface 65 may be provided at other locations. The joint surface 65 is connected to the end of the outer peripheral surface 63 on the axial outer side Dxo. 【0050】 The joint surface 65 is, for example, a substantially annular plane extending radially outward from the edge of the outer circumferential surface 63. The joint surface 65 faces inward in the axial direction Dxi. The joint surface 65 may also face in other directions intersecting the direction in which the inner circumferential surface 52 faces. 【0051】 The joint surface 65 faces the joint surface 53 of the frame 21. The joint surface 65 may be in contact with the joint surface 53, or it may be slightly separated from the joint surface 53. The joint surface 65 and the joint surface 53 are arranged substantially concentrically and substantially parallel to each other. 【0052】 The length of the end face 64 in the radial direction is shorter than the length of the outer circumferential surface 63 in the axial direction. In other words, the distance between the ends 64a and 64b of the end face 64 is shorter than the distance between the joint surface 65 and the end face 64. 【0053】 A through hole 66 is provided in the joint surface 65. In other words, the bracket 22 is provided with a through hole 66 that opens at the joint surface 65. The through hole 66 is an example of a third hole. The through hole 66 penetrates the flange 62 in the axial direction. The through hole 66 has a diameter that allows the first bolt 25 to pass through the inside of the through hole 66. The through hole 66 communicates with the bolt hole 55. 【0054】 The first bolt 25 is inserted from the outside of the housing 14, through the through hole 66 of the bracket 22, and into the bolt hole 55 of the frame 21. In other words, the first bolt 25 fits into the through hole 66 and the bolt hole 55. This connects the frame 21 and the bracket 22 to each other. 【0055】 As described above, the stepped surface 54 of the frame 21 is connected to the edge 41a of the partial inner surface 41. Furthermore, the end face 64 of the bracket 22 is connected to the edge 42a of the partial inner surface 42. Therefore, the stepped surface 54 and the end face 64 are connected to the inner surface 40. 【0056】 The partial inner surface 41 faces radially inward at its edge 41a. Similarly, the partial inner surface 42 faces radially inward at its edge 42a. The edge 41a of the partial inner surface 41 and the edge 42a of the partial inner surface 42 are located at approximately the same position radially. Therefore, the partial inner surface 41 and the partial inner surface 42 form a substantially smooth and continuous surface. 【0057】 Figure 3 is a cross-sectional view showing the bracket 22 and oil drain 23 of this embodiment. In the example shown in Figure 3, the bracket 22 is an example of a first member, and the oil drain 23 is an example of a second member. 【0058】 As described above, the through-hole 31 penetrates the bracket 22 in the axial direction. The through-hole 31 connects the room 30 to the outside of the housing 14. The through-hole 31 is an example of a first hole. The axial direction is an example of a first direction. 【0059】 The bracket 22 has an inner circumferential surface 72, a joining surface 73, and an end surface 74. The joining surface 73 is an example of a first joining surface. The end surface 74 is an example of a first surface. 【0060】 The inner circumferential surface 72 is a substantially cylindrical curved surface extending in the axial direction. The inner circumferential surface 72 forms (defines or partitions) a portion of the insertion hole 31. The inner circumferential surface 72 faces radially inward. In other words, the inner circumferential surface 72 faces inward towards the insertion hole 31. 【0061】 The joint surface 73 is connected to the end of the inner circumferential surface 72 in the axial outer direction Dxo. The axial outer direction Dxo is an example of a first direction. The joint surface 73 is, for example, a substantially annular plane extending radially inward from the end of the inner circumferential surface 72. 【0062】 The joint surface 73 faces inward in the axial direction Dxi. Inward in the axial direction Dxi is perpendicular to the direction in which the inner circumferential surface 72 faces. Inward in the axial direction Dxi is an example of a direction that intersects with the direction in which the inner circumferential surface faces. The joint surface 73 may also face in other directions that intersect with the direction in which the inner circumferential surface 72 faces. 【0063】 A through hole 75 is provided in the joint surface 73. In other words, the bracket 22 is provided with a through hole 75 that opens at the joint surface 73. The through hole 75 is an example of a second hole. The through hole 75 penetrates the bracket 22 in the axial direction. The through hole 75 has a diameter that allows the second bolt 26 to pass through the inside of the through hole 75. Also, an oil passage 34 opens at the joint surface 73. 【0064】 The end face 74 is provided, for example, at a position spaced inward in the axial direction Dxi from the joint surface 73. Inward in the axial direction Dxi is an example of a second direction. The end 74a of the end face 74 on the radially inward side is connected to the end of the inner circumferential surface 72 on the axially inward inward Dxi. End 74a is an example of a first end. The end 74b of the end face 74 on the radially outward side is connected to the edge 42b of the partial inner surface 42 of the bracket 22. End 74b is located on the opposite side of end 74a. End 74b is an example of a second end. Edge 42b is an example of a first edge. 【0065】 The end face 74 is, for example, a substantially annular plane extending radially outward from the end of the inner circumferential surface 72. The end face 74 faces inward in the axial direction Dxi. Therefore, the end face 74 intersects with the axial direction. The end face 74 may also face in a direction other than the direction that the inner circumferential surface 72 faces. The direction that the end face 74 faces may be different from the direction that the joint surface 73 faces. 【0066】 The length of the end face 74 in the radial direction is shorter than the length of the inner circumferential surface 72 in the axial direction. In other words, the distance between the ends 74a and 74b of the end face 74 is shorter than the distance between the joint surface 73 and the end face 74. 【0067】 The oil cutter 23 has a plug portion 81 and a flange 82. The flange 82 is an example of a second projection. The plug portion 81 is formed in a substantially cylindrical shape and is fitted into a part of the insertion hole 31. The plug portion 81 has an outer peripheral surface 83 and a joint surface 84. The joint surface 84 is an example of a second joint surface. 【0068】 The outer circumferential surface 83 is a roughly cylindrical curved surface extending in the axial direction. The diameter of the outer circumferential surface 83 is equal to or slightly shorter than the diameter of the inner circumferential surface 72. Also, in the axial direction, the length of the outer circumferential surface 83 is approximately equal to the length of the inner circumferential surface 72. 【0069】 The outer circumferential surface 83 faces radially outward. The outer circumferential surface 83 faces the inner circumferential surface 72. The outer circumferential surface 83 may be in contact with the inner circumferential surface 72, or it may be slightly separated from the inner circumferential surface 72. The outer circumferential surface 83 and the inner circumferential surface 72 are arranged substantially concentrically and substantially parallel to each other. 【0070】 The joint surface 84 is provided at the end of the plug portion 81 on the outer axial direction Dxo. The joint surface 84 may be provided at other locations. The joint surface 84 is, for example, a substantially annular plane extending radially inward from the end of the outer peripheral surface 83. The joint surface 84 faces the outer axial direction Dxo. The joint surface 84 may also face in a direction other than the direction in which the inner peripheral surface 72 faces. 【0071】 The joint surface 84 faces the joint surface 73 of the bracket 22. The joint surface 84 may be in contact with the joint surface 73, or it may be slightly separated from the joint surface 73. The joint surface 84 and the joint surface 73 are arranged substantially concentrically and substantially parallel to each other. 【0072】 A bolt hole 85 is provided in the joint surface 84. In other words, a bolt hole 85 that opens at the joint surface 84 is provided in the oil cutter 23. The bolt hole 85 is an example of a third hole. The bolt hole 85 extends axially from the joint surface 84. The bolt hole 85 communicates with the through hole 75. A female thread is formed on the inner surface of the bolt hole 85. The female thread of the bolt hole 85 can be fitted onto the male thread of the second bolt 26. 【0073】 The second bolt 26 is inserted from outside the housing 14, through the through hole 75 of the bracket 22, and into the bolt hole 85 of the oil cutter 23. In other words, the second bolt 26 fits into the through hole 75 and the bolt hole 85. This connects the bracket 22 and the oil cutter 23 to each other. 【0074】 The flange 82 protrudes radially outward from the outer circumferential surface 83 of the plug portion 81. The flange 82 covers the joint surface 73 of the bracket 22. The flange 82 is provided with a side surface 86. The side surface 86 is an example of a second surface. The side surface 86 is provided, for example, at the end of the flange 82 on the axially outer side Dxo. The side surface 86 may be provided at other positions. The side surface 86 is connected to the end of the outer circumferential surface 83 on the axially inner side Dxi. 【0075】 The side surface 86 is, for example, a substantially annular plane extending radially outward from the edge of the outer peripheral surface 83. The side surface 86 faces outward in the axial direction Dxo. Therefore, the side surface 86 intersects with the axial direction. Note that the side surface 86 may also face in other directions that intersect with the direction in which the inner peripheral surface 72 faces. 【0076】 The side surface 86 faces the end surface 74. The side surface 86 may be in contact with the end surface 74, or it may be slightly separated from the end surface 74. The side surface 86 and the end surface 74 are arranged substantially concentrically and substantially parallel to each other. 【0077】 The radially inner end 86a of the side surface 86 connects to the end of the outer circumferential surface 83 on the axially inner side Dxi. The radially outer end 86b of the side surface 86 connects to the edge 43a of the partial inner surface 43 of the oil cutter 23. The edge 43a is an example of a second edge. 【0078】 The length of the radial side surface 86 is shorter than the length of the axial outer surface 83. In other words, the distance between the ends 86a and 86b of the side surface 86 is shorter than the distance between the joint surface 84 and the side surface 86. 【0079】 As described above, the end face 74 of the bracket 22 is connected to the edge 42b of the partial inner surface 42. Furthermore, the side surface 86 of the oil cutter 23 is connected to the edge 43a of the partial inner surface 43. Therefore, the end face 74 and the side surface 86 are connected to the inner surface 40. 【0080】 The partial inner surface 42 faces radially outward at its edge 42b. Similarly, the partial inner surface 43 faces radially outward at its edge 43a. The edge 42b of the partial inner surface 42 and the edge 43a of the partial inner surface 43 are located at approximately the same position radially. Therefore, the partial inner surface 42 and the partial inner surface 43 form a substantially smooth and continuous surface. 【0081】 Figure 4 is a cross-sectional view showing the frame 21 and terminal board 24 of this embodiment. In the example shown in Figure 4, the frame 21 is an example of a first member, and the terminal board 24 is an example of a second member. 【0082】 Two fitting openings 91 are provided in the frame 21. The two fitting openings 91 are provided in the frame 21 and connect the room 30 to the outside of the housing 14. The fitting openings 91 are an example of a first hole. The fitting openings 91 penetrate the frame 21 in the radial direction. The radial direction is an example of a first direction. The two fitting openings 91 are spaced apart from each other in the axial direction. 【0083】 The frame 21 has an inner circumferential surface 92, a joint surface 93, a first stepped surface 94, and a second stepped surface 95. The joint surface 93 is an example of the first joint surface. The first stepped surface 94 is an example of the first surface. 【0084】 The inner circumferential surface 92 is a substantially cylindrical surface extending in the radial direction. The inner circumferential surface 92 forms (defines or partitions) a part of the fitting opening 91. The inner circumferential surface 92 faces inward towards the fitting opening 91. 【0085】 The joint surface 93 is connected to the end of the inner circumferential surface 92 in the radially outer Dro. The radially outer Dro is the direction toward the outside of the housing 14 in one of the multiple radial directions to which the mating opening 91 extends. The radially outer Dro is included in the radial direction. The radially outer Dro is an example of a first direction. 【0086】 The joint surface 93 is, for example, a substantially annular plane extending from the end of the inner circumferential surface 92 in a direction perpendicular to the radial direction. The joint surface 93 faces radially outward Dro. Radially outward Dro is perpendicular to the direction in which the inner circumferential surface 92 faces. Radially outward Dro is an example of a direction that intersects with the direction in which the inner circumferential surface faces. The joint surface 93 may also face other directions that intersect with the direction in which the inner circumferential surface 92 faces. 【0087】 A bolt hole 96 is provided in the joint surface 93. In other words, the frame 21 is provided with a bolt hole 96 that opens at the joint surface 93. The bolt hole 96 is an example of a second hole. The bolt hole 96 extends radially from the joint surface 93. A female thread is formed on the inner surface of the bolt hole 96. The female thread of the bolt hole 96 can be fitted onto the male thread of the third bolt 27. 【0088】 The first stepped surface 94 is provided, for example, at a position spaced radially inward Dri from the joint surface 93. Radially inward Dri is the direction toward the interior of the housing 14 in one of the radial directions from which the mating opening 91 extends. Radially inward Dri is included in the radial direction. Radially inward Dri is the opposite direction to radially outward Dro and is an example of a second direction. 【0089】 One end 94a of the first stepped surface 94 in a direction perpendicular to the radial direction is connected to the end of the inner circumferential surface 92 in the radially inner Dri. The other end 94b of the first stepped surface 94 in a direction perpendicular to the radial direction is connected to the second stepped surface 95. End 94b is located on the opposite side of end 94a. 【0090】 The first stepped surface 94 is, for example, a substantially annular plane extending from the end of the inner circumferential surface 92 in a direction perpendicular to the radial direction. The first stepped surface 94 faces outward in the radial direction (Dro). Therefore, the first stepped surface 94 intersects with the radial direction. The first stepped surface 94 may also face in a direction other than the direction that the inner circumferential surface 92 faces. The direction that the first stepped surface 94 faces may be different from the direction that the joint surface 93 faces. 【0091】 The length of the first stepped surface 94 in the direction perpendicular to the radial direction is shorter than the length of the inner circumferential surface 92 in the radial direction. In other words, the distance between the ends 94a and 94b of the first stepped surface 94 is shorter than the distance between the joint surface 93 and the first stepped surface 94. 【0092】 The second stepped surface 95 is a substantially cylindrical surface that extends radially inward Dri from the first stepped surface 94. The second stepped surface 95 forms (defines or partitions) a part of the fitting opening 91. The second stepped surface 95 faces inward into the fitting opening 91. 【0093】 The end 95a of the second stepped surface 95 on the radially outer Dro connects to the end 94b of the first stepped surface 94. The end 95b of the second stepped surface 95 on the radially inner Dri connects to the edge 41b of the partial inner surface 41 of the frame 21. The end 95b is located on the opposite side of the end 95a. 【0094】 The length of the second stepped surface 95 in the radial direction is shorter than the length of the inner circumferential surface 92 in the radial direction. In other words, the distance between the ends 95a and 95b of the second stepped surface 95 is shorter than the distance between the joint surface 93 and the first stepped surface 94. 【0095】 The frame 21 further has a step 97. The step 97 is an example of a first projection. The step 97 protrudes from the inner circumferential surface 92. The step 97 is spaced radially inward Dri from the joint surface 93. A first stepped surface 94 and a second stepped surface 95 are provided on the step 97. 【0096】 The cover 35 of the terminal board 24 has a plug portion 101 and a flange 102. The plug portion 101 is formed in a substantially columnar shape and is fitted into the fitting opening 91. Therefore, the plug portion 101 closes the fitting opening 91. The plug portion 101 has an outer peripheral surface 103, a first stepped surface 104, and a second stepped surface 105. The first stepped surface 104 is an example of the second surface. 【0097】 The outer circumferential surface 103 is a roughly cylindrical surface extending in the radial direction. The size of the outer circumferential surface 103 is equal to or slightly smaller than the size of the inner circumferential surface 92. Also, in the radial direction, the length of the outer circumferential surface 103 is approximately equal to the length of the inner circumferential surface 92. 【0098】 The outer circumferential surface 103 faces the inner circumferential surface 92. The outer circumferential surface 103 may be in contact with the inner circumferential surface 92, or it may be slightly separated from the inner circumferential surface 92. The outer circumferential surface 103 and the inner circumferential surface 92 are arranged approximately parallel to each other. 【0099】 One end 104a of the first stepped surface 104 in a direction perpendicular to the radial direction is connected to the end of the outer circumferential surface 103 in the inner radial direction Dri. The other end 104b of the first stepped surface 104 in a direction perpendicular to the radial direction is connected to the second stepped surface 105. 【0100】 The first stepped surface 104 is, for example, a substantially annular plane extending from the end of the outer peripheral surface 103. The first stepped surface 104 faces inward in the radial direction Dri. Therefore, the first stepped surface 104 intersects with the radial direction. The first stepped surface 104 may also face in a direction other than the direction that the inner peripheral surface 92 faces. 【0101】 The first stepped surface 104 faces the first stepped surface 94 of the frame 21. The first stepped surface 104 may be in contact with the first stepped surface 94, or it may be slightly separated from the first stepped surface 94. The first stepped surfaces 94 and 104 of the frame 21 and the cover 35 are arranged substantially parallel to each other. 【0102】 The second stepped surface 105 is a substantially cylindrical surface extending radially inward Dri from the first stepped surface 104. The end 105a of the second stepped surface 105 in radially outward Dro is connected to the end 104b of the first stepped surface 104. The end 105b of the second stepped surface 105 in radially inward Dri is connected to the edge 44a of the partial inner surface 44 of the terminal plate 24. End 105b is located on the opposite side of end 105a. 【0103】 The second stepped surface 105 faces the second stepped surface 95 of the frame 21. The second stepped surface 105 may be in contact with the second stepped surface 95, or it may be slightly separated from the second stepped surface 95. The second stepped surfaces 95 and 105 of the frame 21 and the cover 35 are arranged substantially parallel to each other. 【0104】 The flange 102 protrudes radially outward from the plug portion 101 and covers the joint surface 93 of the frame 21. The flange 102 has a joint surface 106. The joint surface 106 is an example of a second joint surface. The joint surface 106 is provided, for example, at the end of the flange 102 on the radially inner Dri. The joint surface 106 may be provided at other locations. The joint surface 106 is connected to the end of the outer peripheral surface 103 on the radially outer Dro. 【0105】 The joint surface 106 is, for example, a substantially annular plane extending from the end of the outer circumferential surface 103. The joint surface 106 faces radially inward (Dri). The joint surface 106 may also face in a direction other than the direction in which the inner circumferential surface 92 faces. 【0106】 The joint surface 106 faces the joint surface 93 of the frame 21. The joint surface 106 may be in contact with the joint surface 93, or it may be slightly separated from the joint surface 93. The joint surface 106 and the joint surface 93 are arranged approximately parallel to each other. 【0107】 The length of the first stepped surface 104 in the direction perpendicular to the radial direction is shorter than the length of the outer circumferential surface 103 in the radial direction. In other words, the distance between the ends 104a and 104b of the first stepped surface 104 is shorter than the distance between the joint surface 106 and the first stepped surface 104. Also, the distance between the ends 105a and 105b of the second stepped surface 105 is shorter than the distance between the joint surface 106 and the first stepped surface 104. 【0108】 A through hole 107 is provided in the joint surface 106. In other words, the cover 35 is provided with a through hole 107 that opens at the joint surface 106. The through hole 107 is an example of a third hole. The through hole 107 penetrates the flange 102 radially. The through hole 107 has a diameter that allows the third bolt 27 to pass through the inside of the through hole 107. The through hole 107 communicates with the bolt hole 96. 【0109】 The third bolt 27 is inserted from the outside of the housing 14, through the through hole 107 in the cover 35, and into the bolt hole 96 in the frame 21. In other words, the third bolt 27 fits into the through hole 107 and the bolt hole 96. This connects the frame 21 and the cover 35. 【0110】 As described above, the second stepped surface 95 of the frame 21 is connected to the edge 41b of the partial inner surface 41. Furthermore, the second stepped surface 105 of the cover 35 is connected to the edge 44a of the partial inner surface 44. Therefore, the second stepped surfaces 95 and 105 are connected to the inner surface 40. 【0111】 The partial inner surface 41 faces radially inward Dri at its edge 41b. Similarly, the partial inner surface 44 faces radially inward Dri at its edge 44a. The edge 41b of the partial inner surface 41 and the edge 44a of the partial inner surface 44 are located at approximately the same position in the radial direction. Therefore, the partial inner surface 41 and the partial inner surface 44 form a substantially smooth and continuous surface. 【0112】 The explosion-proof motor 10 can prevent sparks from reaching the outside of the housing 14 even if an explosion occurs in room 30. The following description explains the case where an explosion occurs in room 30. The motor 10 is equipped with various configurations that can suppress the occurrence of an explosion in room 30. 【0113】 As shown in Figure 2, gaps G1, G2, and G3 may be provided between the frame 21 and the bracket 22. Gap G1 is provided between the joint surface 53 and the joint surface 65. Gap G2 is provided between the inner circumferential surface 52 and the outer circumferential surface 63. Gap G3 is provided between the stepped surface 54 and the end surface 64. 【0114】 Gap G1 extends radially and communicates with the outside of the housing 14. Furthermore, gap G1 communicates with the outside of the housing 14 through the through hole 66. Gap G3 extends radially and communicates with room 30. Gap G2 extends axially and communicates with gaps G1 and G3. Therefore, there is a risk that room 30 will communicate with the outside of the housing 14 through gaps G1, G2, G3 and the through hole 66. 【0115】 If an explosion occurs in room 30, there is a risk that sparks will enter gap G3. However, at the point where gap G3 and gap G2 connect, the sparks will collide with the inner circumferential surface 52, causing a pressure loss. With the pressure reduced, the sparks will travel axially through gap G2, which is longer than gap G3. As a result, the electric motor 10 can extinguish the sparks in gap G2. 【0116】 As shown in Figure 3, gaps G4, G5, and G6 may be provided between the bracket 22 and the oil drain 23. Gap G4 is provided between the joint surface 73 and the joint surface 84. Gap G5 is provided between the inner circumferential surface 72 and the outer circumferential surface 83. Gap G6 is provided between the end surface 74 and the side surface 86. 【0117】 Gap G4 extends radially. Gap G4 communicates with the outside of the housing 14 through, for example, the bearing chamber 33 and the gap between the shaft 13 and the bracket 22. Furthermore, gap G4 communicates with the outside of the housing 14 through the bearing chamber 33 and the through hole 75. Gap G6 extends radially and communicates with chamber 30. Gap G5 extends axially and communicates with gaps G4 and G6. Therefore, there is a risk that chamber 30 will communicate with the outside of the housing 14 through gaps G4, G5, G6 and the through hole 75. 【0118】 If an explosion occurs in room 30, there is a risk that sparks will enter gap G6. However, at the point where gap G6 and gap G5 connect, the sparks will collide with the outer surface 83, causing a pressure loss. With the pressure reduced, the sparks will travel axially through gap G5, which is longer than gap G6. As a result, the electric motor 10 can extinguish the sparks in gap G5. 【0119】 As shown in Figure 4, gaps G7, G8, G9, and G10 may be provided between the frame 21 and the terminal board 24. Gap G7 is provided between the joint surface 93 and the joint surface 106. Gap G8 is provided between the inner circumferential surface 92 and the outer circumferential surface 103. Gap G9 is provided between the first stepped surface 94 and the first stepped surface 104. Gap G10 is provided between the second stepped surface 95 and the second stepped surface 105. 【0120】 Gap G7 extends in a direction perpendicular to the radial direction and communicates with the outside of the housing 14. Furthermore, gap G7 communicates with the outside of the housing 14 through the through hole 107. Gap G10 extends in the radial direction and communicates with room 30. Gap G8 extends in the radial direction and communicates with gaps G7 and G9. Gap G9 extends in a direction perpendicular to the radial direction and communicates with gaps G8 and G10. Therefore, room 30 may communicate with the outside of the housing 14 through gaps G7, G8, G9, G10 and the through hole 107. 【0121】 If an explosion occurs in room 30, there is a risk that sparks will enter gap G10. However, at the point where gap G10 and gap G9 are connected, the sparks will collide with the first stepped surface 104, causing a pressure loss. With the pressure reduced, the sparks will travel through gap G9 in a direction perpendicular to the radial direction. As a result, the electric motor 10 can extinguish the sparks in gap G9. 【0122】 There is a risk that sparks will pass through the gap G9. However, at the point where gaps G8 and G9 connect, the sparks collide with the inner circumferential surface 92, causing a pressure loss. With the pressure reduced, the sparks travel radially through the gap G8, which is longer than the gap G9. As a result, the electric motor 10 can extinguish the sparks in the gap G8. 【0123】 In the rotating electric machine according to the embodiment described above, the housing comprises a first member, a second member, and bolts. The bolts connect the first member and the second member to each other. The housing is provided with a chamber in which a stator and a rotor are housed. The first member is provided with a first hole that penetrates the first member in a first direction and connects the chamber to the outside of the housing. The first member has an inner circumferential surface, a first joining surface, and a first surface. The inner circumferential surface faces inward into the first hole. The first joining surface is connected to the end of the inner circumferential surface in the first direction and faces in a direction intersecting the direction in which the inner circumferential surface faces, and is provided with a second hole into which the bolts are fitted. The first surface is connected to the end of the inner circumferential surface in a second direction opposite to the first direction and faces in a direction intersecting the direction in which the inner circumferential surface faces. The second member is fitted into the first hole. The second member has an outer circumferential surface, a second joining surface, and a second surface. The outer circumferential surface faces the inner circumferential surface. The second joining surface is connected to the end of the outer circumferential surface in the first direction, faces the first joining surface, and has a third hole into which a bolt fits. The second surface is connected to the end of the outer circumferential surface in the second direction and faces the first surface. In the above rotating electric machine, gaps may occur between the inner circumferential surface and the outer circumferential surface, between the first joining surface and the second joining surface, and between the first surface and the second surface. The gap between the first joining surface and the second joining surface, which are joined to each other by bolts, can communicate with a room through the gap between the inner circumferential surface and the outer circumferential surface, and the gap between the first surface and the second surface. The direction in which the gap between the inner and outer surfaces extends is different from the direction in which the gap between the first and second joining surfaces extends, and also different from the direction in which the gap between the first and second surfaces extends. Therefore, if an explosion occurs in the room, sparks generated by the explosion will enter the gap between the first and second surfaces and collide with either the inner or outer surface. Consequently, the rotating electric machine of this embodiment can cause pressure loss due to the collision of sparks, preventing the sparks from reaching the outside of the housing through the gap between the first and second joining surfaces and the through-holes. Furthermore, the direction in which the gap between the first and second surfaces extends is different from the direction in which the gap between the inner and outer surfaces extends.Therefore, the rotating electric machine can increase the creepage distance from the chamber to the outside of the housing without increasing the size of the gap between the inner and outer surfaces, thereby suppressing sparks from reaching the outside of the housing. 【0124】 The housing has an inner surface that defines a chamber. At least one of the first and second surfaces is connected to the inner surface and intersects the axial direction of the shaft. As a result, the gap between the first and second surfaces extends in a direction intersecting the axial direction. Chambers generally extend in the axial direction of the shaft. Therefore, explosions occurring in the chamber tend to spread in the axial direction of the shaft. Accordingly, the rotating electric machine of this embodiment can prevent sparks from entering the gap between the first and second surfaces by extending the gap between the first and second surfaces in a direction intersecting the axial direction of the shaft where the explosion spreads. 【0125】 The inner surface has a first inner surface and a second inner surface. The first inner surface is included in the first member. The second inner surface is included in the second member. The first surface is connected to the first edge of the first inner surface. The second surface is connected to the second edge of the second inner surface. The first edge and the second edge are in the same position in the direction that at least one of the first surface and the second surface faces. As a result, the first inner surface and the second inner surface are substantially smooth and continuous at the first edge and the second edge. As a result, if an explosion occurs in the room, the sparks generated by the explosion will easily flow along the continuous first inner surface and the second inner surface. Therefore, the rotating electric machine of this embodiment can prevent sparks from entering the gap between the first surface and the second surface. 【0126】 The first surface has a first end connected to the inner circumferential surface and a second end opposite to the first end. The distance between the first end and the second end is shorter than the distance between the first joining surface and the first surface. That is, the length of the gap between the first surface and the second surface (creepage distance) is shorter than the length of the gap between the inner circumferential surface and the outer circumferential surface (creepage distance). Therefore, sparks entering the gap between the first surface and the second surface immediately cause a pressure loss. Consequently, the rotating electric machine of this embodiment can quickly weaken sparks and prevent them from reaching the outside of the housing. 【0127】 The first surface is provided on the first projection that protrudes from the inner circumferential surface. This allows the first projection to support the second member. Therefore, the rotating electric machine of this embodiment can improve the strength of the portion where the first member and the second member are joined to each other. 【0128】 The second surface is provided on a second projection that protrudes from the outer circumferential surface. This allows the second projection to be supported by the first member. Therefore, the rotating electric machine of this embodiment can improve the strength of the portion where the first member and the second member are joined to each other. 【0129】 The first component has a frame. The frame surrounds the stator and rotor and is fixed to the stator. The second component has a bracket. The bracket closes the end of the frame in the axial direction of the shaft. This prevents sparks from reaching the outside of the housing through the gap between the frame and the bracket in the rotating electric machine of this embodiment. 【0130】 The housing comprises a frame, brackets, and walls. The frame encloses the stator and rotor and is fixed to the stator. The brackets close the ends of the frame in the axial direction of the shaft. The walls are attached to the brackets. Bearings are located between the walls and the brackets and rotatably support the shaft. One of the first and second members has a bracket. The other of the first and second members has a wall. This allows the rotating electric machine of this embodiment to prevent sparks from reaching the outside of the housing through the gap between the brackets and the walls. 【0131】 The first component has a frame. The frame surrounds the stator and rotor and is fixed to the stator. The second component has a cover and terminals. The cover closes the first hole. The terminals pass through the cover and are electrically connected to the stator. As a result, the rotating electric machine of this embodiment can prevent sparks from reaching the outside of the housing through the gap between the frame and the cover. 【0132】 In the above description, suppression is defined, for example, as preventing the occurrence of an event, action, or effect, or reducing the degree of an event, action, or effect. Also in the above description, restriction is defined, for example, as preventing movement or rotation, or allowing movement or rotation within a predetermined range while preventing movement or rotation beyond that predetermined range. 【0133】 The embodiments of the present invention described above are not intended to limit the scope of the invention, but are merely examples that fall within the scope of the invention. Some embodiments of the present invention may be modified, omitted, or added to the embodiments described above, for example, with respect to at least some of the specific uses, structures, shapes, functions, and effects, without departing from the spirit of the invention. [Explanation of symbols] 【0134】 10…Electric motor, 11…Stator, 12…Rotor, 13…Shaft, 14…Housing, 21…Frame, 22…Bracket, 23…Oil drain, 24…Terminal board, 25…First bolt, 26…Second bolt, 27…Third bolt, 30…Room, 31…Through hole, 51…Matching opening, 52…Inner circumferential surface, 53…Jointing surface, 54…Stepped surface, 55…Bolt hole, 63…Outer circumferential surface, 65…Jointing surface, 66… Through hole, 72...inner circumferential surface, 73...joint surface, 74...end face, 75...through hole, 83...outer circumferential surface, 84...joint surface, 85...bolt hole, 91...fitting opening, 92...inner circumferential surface, 93...joint surface, 94...first stepped surface, 96...bolt hole, 103...outer circumferential surface, 104...first stepped surface, 107...through hole, Dxo...outer in the axial direction, Dro...outer in the radial direction, Dxi...inner in the axial direction, Dri...inner in the radial direction.

Claims

[Claim 1] stator and, A rotor that can rotate inside the stator, A shaft that can rotate together with the rotor, A housing comprising a first member, a second member, and bolts connecting the first member and the second member to each other, and having a chamber for housing the stator and the rotor, It is equipped with, The first member is provided with a first hole that penetrates the first member in a first direction, connecting the room and the outside of the housing. The inner circumferential surface facing inward of the first hole, A first joining surface is connected to the end of the inner circumferential surface in the first direction, faces in a direction intersecting the direction in which the inner circumferential surface faces, and is provided with a second hole into which the bolt is fitted, A first surface connected to the end of the inner circumferential surface in a second direction opposite to the first direction, and facing in a direction intersecting the direction in which the inner circumferential surface faces, It has, The second member is fitted into the first hole, The outer surface facing the inner surface, A second joint surface is connected to the end of the outer circumferential surface in the first direction, faces the first joint surface, and is provided with a third hole into which the bolt fits, A second surface connected to the end of the outer circumferential surface in the second direction and facing the first surface, It has, The second surface is provided on the second projection that protrudes from the outer peripheral surface. Rotating electric machine. [Claim 2] The housing has an inner surface that defines the room, At least one of the first surface and the second surface is connected to the inner surface and intersects with the axial direction of the shaft, A rotating electric machine according to claim 1. [Claim 3] The inner surface comprises a first inner surface included in the first member and a second inner surface included in the second member. The first surface is connected to the first edge of the first inner surface, The second surface is connected to the second edge of the second inner surface, The first edge and the second edge are in the same position in the direction that at least one of the first surface and the second surface faces. The rotating electric machine according to claim 2. [Claim 4] The first surface has a first end connected to the inner circumferential surface and a second end opposite to the first end, The distance between the first end and the second end is shorter than the distance between the first joining surface and the first surface. A rotating electric machine according to any one of claims 1 to 3. [Claim 5] The system further comprises a bearing that rotatably supports the aforementioned shaft, The housing comprises a frame that surrounds the stator and rotor and is fixed to the stator, a bracket that closes the end of the frame in the axial direction of the shaft, and a wall attached to the bracket. The bearing is located between the wall and the bracket. One of the first member and the second member has the bracket, The other of the first member and the second member has the wall, A rotating electric machine according to any one of claims 1 to 3.

Images