Rotating Electric Machine

Abstract

To simplify manufacturing work and improve reliability in a rotary electric machine.SOLUTION: A rotary electric machine includes a rotor, a stator formed in an annular shape by laminating a plurality of magnetic plates outside the rotor, a pair of stator retainer plates arranged annularly on both sides in the stacking direction of the stator, and a cast interface that is fixed to the outer peripheral surface of the stator to connect a pair of stator retainer plates together and to fix the stator at the rotary electric machine mounting position, which has a continuous structure from the fixing surface to the outer peripheral surface of the stator to the fixing surface to the rotating electrical machine mounting position.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] An embodiment of the present invention relates to a rotating electric machine. [Background technology]

[0002] In general, a railway vehicle is equipped with a rotating electric machine mounted on a bogie arranged under the vehicle body, and the driving torque of the rotating electric machine is transmitted to the wheels via a joint and a reduction gear, causing the wheels to rotate, thereby allowing the vehicle to run. The rotating electric machine is fixed to the bogie by a mounting part. An example of such a rotating electric machine is described in Patent Document 1 below. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 4-150747 Summary of the Invention [Problem to be solved by the invention]

[0004] The mounting portion for fixing the rotating electric machine to the bogie must support the weight of the rotating electric machine on the bogie, and therefore must be sufficiently strong and have a complex shape. Conventionally, the mounting portion is formed by connecting a plurality of components by welding. That is, the mounting portion is manufactured by connecting a plurality of components by welding, and the mounting portion is fixed to the stator of the rotating electric machine. This increases the number of steps required for welding the mounting portion and inspecting the welded portions, which results in a problem that it takes a long time to manufacture the rotating electric machine.

[0005] An object of the present invention is to provide a rotating electric machine which simplifies the manufacturing process and improves the reliability. [Means for solving the problem]

[0006] The rotating electric machine of the embodiment comprises a rotor, a stator formed in a ring shape by stacking a plurality of magnetic plates on the outside of the rotor, a pair of stator pressure plates arranged in a ring shape on both sides of the stacking direction of the stator, and a cast interface fixed to the outer peripheral surface of the stator to connect the pair of stator pressure plates to each other and fix the stator to a rotating electric machine mounting position, the cast interface having a continuous structure from the fixing surface to the outer peripheral surface of the stator to the fixing surface to the rotating electric machine mounting position. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a schematic diagram for explaining a driving force transmission path in a rotating electric machine according to this embodiment. [Diagram 2] FIG. 2 is a cross-sectional view illustrating an upper portion of the rotating electric machine according to this embodiment. [Diagram 3] FIG. 3 is a perspective view showing a main part of the rotating electric machine. [Figure 4] FIG. 4 is a schematic diagram showing a stator of a rotating electric machine. [Diagram 5] FIG. 5 is a perspective view showing an upper mounting portion of the rotating electric machine. [Figure 6] FIG. 6 is a perspective view showing a lower mounting portion of the rotating electric machine. [Figure 7] FIG. 7 is a perspective view showing a stopper of a rotating electric machine. [Figure 8] FIG. 8 is a perspective view showing a stator connector of a rotating electric machine. [Figure 9] FIG. 9 is a front view showing the mounting state of the rotating electric machine. [Figure 10] FIG. 10 is a plan view showing the mounting state of the rotating electric machine. [Figure 11] FIG. 11 is a plan view showing a modified example of the mounting state of the rotating electric machine. [Figure 12] FIG. 12 is a cross-sectional view showing an upper portion of a modified example of a rotating electric machine. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] [First embodiment] <Configuration of rotating electric machine> 1 is a schematic diagram for explaining a driving force transmission path for transmitting the driving force of a rotating electric machine according to this embodiment to wheels. In the following embodiment, the rotating electric machine will be described as being applied to a driving device of a railway vehicle.

[0009] The railway vehicle drive unit 10 includes a rotating electric machine 11 , a coupling 12 , a reduction gear 13 , an axle 14 , and wheels 15 .

[0010] The rotating electric machine 11 is an electric motor. The rotating electric machine 11 is fixed to the frame (not shown) of the bogie. The rotating electric machine 11 has a drive shaft 16 that can be driven and rotated. The drive shaft 16 is connected to a connecting shaft 17 via a coupling 12. The reduction gear 13 is fixed to the frame of the bogie. The reduction gear 13 is a gear mechanism having a plurality of gears. The connecting shaft 17 is connected to the reduction gear 13. The reduction gear 13 reduces the speed of the input driving rotational force. The axle 14 is rotatably supported on the frame of the bogie. Wheels 15 are fixed to each end of the axle 14 in the axial direction. The axle 14 has an axial middle portion connected to the reduction gear 13.

[0011] Therefore, when the rotating electric machine 11 is driven, the drive shaft 16 is driven to rotate, and the driving torque is input to the reduction gear 13 via the drive shaft 16, the coupling 12, and the connecting shaft 17. The reduction gear 13 reduces the driving rotation speed of the input rotating electric machine 11, and drives and rotates the axle 14. Then, the wheels 15 fixed to each end of the axle 14 rotate, enabling the railway vehicle to run.

[0012] <Configuration of rotating electric machine> FIG. 2 is a cross-sectional view showing the internal structure of the rotating electric machine according to this embodiment, with the upper part cut away along the direction of the rotation axis.

[0013] The rotating electric machine 11 of this embodiment has a frameless structure. The rotating electric machine 11 is a totally enclosed induction motor in which cooling air does not circulate inside and is cooled only by outside air.

[0014] The rotating electric machine 11 includes a rotor 21 and a stator 22. The rotor 21 is configured by fixing a cylindrical rotor core 32 to the outer periphery of a rotating shaft 31. The stator 22 is also cylindrical and is disposed on the outside of the rotor 21. The stator 22 is configured by housing stator coils 34 in a plurality of grooves formed on the inner periphery of a cylindrical stator core 33. A constant gap 35 is formed between the outer periphery of the rotor 21 and the inner periphery of the stator 22 in the circumferential and axial directions. When the rotating electric machine 11 is driven, the rotor 21 rotates due to the attractive and repulsive forces of magnetic forces generated by current flowing through the stator coil 34, and the rotating shaft 31 outputs a rotational force.

[0015] The rotating shaft 31 has one axial end rotatably supported by the bracket 42 via a bearing 41, and the other axial end rotatably supported by the bracket 44 via a bearing 43. The brackets 42, 44 are disk-shaped, and have circular holes 42a, 44a formed in the center thereof penetrating in the axial direction. The bearings 41, 43 are disposed between the rotating shaft 31 and the circular holes 42a, 44a of the brackets 42, 44. The bearings 41, 43 are supported by support parts 45, 46 attached to the brackets 42, 44 to prevent them from falling off. The support parts 45, 46 are cylindrical, and fit into the circular holes 42a, 44a of the brackets 42, 44 from the outside in the axial direction. The rotating shaft 31 has one axial end covered by the bracket 42, and the other axial end protrudes to the outside from a circular hole 44a formed in the bracket 44. The rotating shaft 31 has an end portion that protrudes outward from a circular hole 44a of the bracket 44, and a coupling 12 (see FIG. 1) is attached to the end portion.

[0016] The stator core 33 is formed in an annular shape by stacking a plurality of magnetic plates. A pair of stator pressure plates 47, 48 are arranged on both sides of the stator core 33 in the stacking direction so as to be in close contact with each other. The stator pressure plates 47, 48 are ring-shaped. The stator pressure plates 47, 48 have the same shape and are connected by a plurality of (four in this embodiment) stator connecting parts 49 (50, 51, 52). The stator connecting parts 49 (50, 51, 52) are arranged on the outer periphery side of the stator 22 at predetermined intervals in the circumferential direction of the stator 22. The stator coil 34 is arranged on the inner periphery side of the stator core 33.

[0017] The rotor 21 is connected to a cooling fan 54 on one side in the axial direction via a rotor pressing plate 53, and to a cooling fan 56 on the other side in the axial direction via a rotor pressing plate 55. The cooling fans 54, 56 are disk-shaped and have a plurality of blades 54a, 56a arranged at a predetermined interval in the circumferential direction on the outer periphery. The cooling fans 54, 56 rotate together with the rotating shaft 31 and the rotor 21. The stator 22 is arranged with a bracket 57 on one side in the axial direction and a bracket 58 on the other side in the axial direction. The brackets 57, 58 are formed with circular holes 57a, 58a penetrating in the axial direction at the center. The brackets 57, 58 cover both sides in the axial direction of the stator 22 by connecting the outer periphery to the outer periphery side of the stator pressing plates 47, 48. The outer periphery of the cooling fans 54, 56 contacts the inner periphery of the circular holes 57a, 58a of the brackets 57, 58. Ring-shaped labyrinth seals 59 and 60 are disposed between the inner peripheries of the circular holes 57a and 58a of the brackets 57 and 58 and the outer peripheries of the cooling fans 54 and 56, respectively.

[0018] Further, the brackets 42, 44 are provided with a plurality of (four in this embodiment) outside air intakes 61, 62 located outside the bearings 41, 43. The plurality of outside air intakes 61, 62 are arranged at predetermined intervals in the circumferential direction of the brackets 42, 44, and penetrate the brackets 42, 44 along the axial direction. The bracket 42 is provided with a plurality of (four in this embodiment) outside air exhaust ports 63 located outside the outside air intake 61. The plurality of outside air exhaust ports 63 are arranged at predetermined intervals in the circumferential direction of the bracket 42, and are provided along the axial direction of the bracket 42. The outside air intakes 61 and the outside air exhaust ports 63 are each communicated with each other through a cooling passage 64. The cooling passage 64 is partitioned by the bracket 42 and the cooling fan 54, and the blades 54a of the cooling fan 54 are located therein.

[0019] A cover 65 is disposed on the outside of the bracket 58. The cover 65 has a curved shape, and a circular hole 65a is formed in the center, penetrating in the axial direction. The cover 65 covers the outside of the bracket 58 by connecting the outer periphery to the outer periphery of the stator pressing plate 48. The outside air intake 62 communicates with one side of the cooling passage 66. The cooling passage 66 is partitioned by the bracket 44 and the cooling fan 56, and is also partitioned by the bracket 58 and the cover 65, and the blade portion 55a of the cooling fan 56 is located therein. A ventilation passage 67 is formed between the stator core 33 and the stator connecting portion 49 (50, 51, 52). The ventilation passage 67 is provided in parallel with the axial direction of the stator 22. The stator pressing plates 47, 48 have through holes 47a, 48a formed in positions facing the ventilation passage 67. The ventilation passage 67 communicates with the other side of the cooling passage 64 through the through hole 48a, and communicates with the outside via the through hole 47a.

[0020] When the rotor 21 rotates, the cooling fans 54, 56 rotate. When the cooling fan 54 rotates, outside air is taken into the cooling passage 64 from the outside air inlet 61. The outside air taken into the cooling passage 64 cools the rotor 21 as it flows through the cooling passage 64, and is discharged to the outside from the outside air outlet 63. When the cooling fan 56 rotates, outside air is taken into the cooling passage 66 from the outside air inlet 62. The outside air taken into the cooling passage 66 cools the rotor 21 as it flows through the cooling passage 66, and flows from the through hole 48a into the ventilation passage 67. The outside air taken into the ventilation passage 67 cools the stator 22 as it flows through the ventilation passage 67, and is discharged to the outside from the through hole 47a.

[0021] Fig. 3 is a perspective view showing a main part of a rotating electric machine. Fig. 3 shows a rotating electric machine 11 in which an interface is attached to the outer periphery of a stator 22. Note that in Fig. 3, a rotating shaft 31 and a rotor 21 are omitted.

[0022] In this embodiment, the interfaces are an upper mounting portion 71, a lower mounting portion 72, a stopper 73, and a stator connecting portion 52. The upper mounting portion 71, the lower mounting portion 72, the stopper 73, and the stator connecting portion 52 are arranged at a predetermined interval in the circumferential direction of the stator 22. The upper mounting portion 71, the lower mounting portion 72, the stopper 73, and the stator connecting portion 52 are fixed to the stator core 33 and the stator pressing plates 47, 48 by welding, respectively. The upper mounting portion 71 is a support portion for supporting the rotating electric machine 11 on the vehicle body, and is fixed to an upper portion on one side of the stator 22. The lower mounting portion 72 is a support portion for supporting the rotating electric machine 11 on the vehicle body, and is fixed to a lower portion on one side of the stator 22. The stopper 73 is used as a hoist when the rotating electric machine 11 is transported, and is also used to abut against the axle 14 (see FIG. 1) when the rotating electric machine 11 falls off, thereby suppressing damage caused by the fall. The stator connecting portion 52 connects the stator pressing plates 47, 48 to each other.

[0023] <Stator configuration> Fig. 4 is a schematic diagram showing a stator of a rotating electric machine, in which stator 22 of rotating electric machine 11 is viewed obliquely from above.

[0024] The stator pressing plates 47, 48 are ring-shaped. The stator core 33 is formed in an annular shape by laminating a plurality of magnetic plates, and the stator pressing plates 47, 48 are arranged in close contact with both sides in the lamination direction. The stator pressing plates 47, 48 are ring-shaped, and through holes 47a, 48a are formed in the outer periphery at a predetermined interval in the circumferential direction.

[0025] In this embodiment, the upper mounting part 71, the lower mounting part 72, the stopper 73, and the stator connecting part 52 serving as the interface are made by casting. That is, the upper mounting part 71, the lower mounting part 72, the stopper 73, and the stator connecting part 52 are manufactured by pouring molten metal into a mold and solidifying the metal by cooling.

[0026] <Interface configuration> FIG. 5 is a perspective view showing an upper mounting portion of the rotating electric machine.

[0027] FIG. 5 shows the upper mounting part 71 as viewed from diagonally above. As shown in FIG. 3 and FIG. 5, the upper mounting part 71 has a stator connecting part 49, a fixing part 81, and a plurality of support connecting parts 82, 83. The stator connecting part 49 is disposed between the stator pressing plates 47, 48 on the outer circumferential side of the stator 22. The stator connecting part 49 has mounting surfaces 49a, 49b formed at one end and the other end in the circumferential direction of the stator 22, and a notch 49c is formed between the mounting surfaces 49a, 49b. The fixing part 81 is disposed above the stator connecting part 49 and disposed along the axial direction of the stator 22. The fixing part 81 fixes the stator 22 to the rotating electric machine mounting position, and has a mounting surface 81a that forms a horizontal plane and a plurality of (in this embodiment, two) mounting holes 81b, 81c formed therein. The mounting surface 81a of the fixed portion 81 is a machined surface that is machined (e.g., cut) after casting. The support connecting parts 82, 83 connect the stator connecting part 49 and the fixed part 81. The support connecting parts 82, 83 are arranged in a direction perpendicular to the stator connecting part 49 and the fixed part 81. A plurality of the support connecting parts 82, 83 (two in this embodiment) are arranged at predetermined intervals in the axial direction of the stator 22. The support connecting parts 82, 83 have through holes 82a, 82b formed therein, respectively.

[0028] FIG. 6 is a perspective view showing a lower mounting portion of the rotating electric machine.

[0029] FIG. 6 shows the lower mounting portion 72 as seen from diagonally above. As shown in FIG. 3 and FIG. 6, the lower mounting portion 72 has a stator connecting portion 50, a fixing portion 84, and a plurality of support connecting portions 85, 86. The stator connecting portion 50 is disposed between the stator pressing plates 47, 48 on the outer circumferential side of the stator 22. The stator connecting portion 50 has mounting surfaces 50a, 50b formed at one end and the other end in the circumferential direction of the stator 22, and a notch portion 50c is formed between the mounting surfaces 50a, 50b. The fixing portion 84 is disposed on the side of the stator connecting portion 50 and disposed along the axial direction of the stator 22. The fixing portion 84 fixes the stator 22 to the mounting position of the rotating electric machine, and has a mounting surface 84a that forms a vertical surface, a plurality of (two in this embodiment) mounting holes 84b, 84c formed therein, and a through hole 84d formed between the mounting holes 84b, 84c. The mounting surface 84a of the fixed portion 84 is a machined surface that is machined (e.g., cut) after casting. The support connecting parts 85, 86 connect the stator connecting part 50 and the fixed part 84. The support connecting parts 85, 86 are arranged in a direction perpendicular to the stator connecting part 50 and the fixed part 84. A plurality of the support connecting parts 85, 86 (two in this embodiment) are arranged at a predetermined interval in the axial direction of the stator 22.

[0030] FIG. 7 is a perspective view showing a stopper of a rotating electric machine.

[0031] FIG. 7 shows the stopper 73 as seen from diagonally above. As shown in FIG. 3 and FIG. 7, the stopper 73 has a stator connecting portion 51 and a plurality of locking portions 87, 88. The stator connecting portion 51 is disposed between the stator pressing plates 47, 48 on the outer circumferential side of the stator 22. The stator connecting portion 51 has mounting surfaces 51a, 51b formed at one end and the other end in the circumferential direction of the stator 22, and a notch portion 51c is formed between the mounting surfaces 51a, 51b. The locking portions 87, 88 are connected to the outer surface portion of the stator connecting portion 51. The locking portions 87, 88 are disposed in a direction perpendicular to the stator connecting portion 51. A plurality of the locking portions 87, 88 (two in this embodiment) are disposed at a predetermined interval in the axial direction of the stator 22. The locking portions 87, 88 are formed with through holes 87a, 87b, respectively.

[0032] FIG. 8 is a perspective view showing a stator connector of a rotating electric machine.

[0033] Fig. 8 shows the stator coupling part 52 as seen from diagonally above. As shown in Fig. 3 and Fig. 8, the stator coupling part 52 is disposed between the stator pressing plates 47, 48 on the outer circumferential side of the stator 22. The stator coupling part 52 has mounting surfaces 52a, 52b formed at one end and the other end in the circumferential direction of the stator 22, and a notch 52c formed between the mounting surfaces 52a, 52b.

[0034] <Detailed configuration of stator> Fig. 9 is a front view showing the mounted state of the rotating electric machine, and Fig. 10 is a plan view showing the mounted state of the rotating electric machine. Note that rotating shaft 31 and rotor 21 are omitted in Figs. 9 and 10.

[0035] 9 shows a front view of the rotating electric machine mounted on the underframe of the bogie, and FIG. 10 shows a plan view of the rotating electric machine mounted on the underframe of the bogie. As shown in FIG. 9 and FIG. 10, the rotating electric machine 11 has an upper mounting portion 71 and a lower mounting portion 72 fixed to the outer periphery of the stator 22. The underframe 100 of the bogie, which serves as the mounting position of the rotating electric machine, is provided with a horizontal mounting surface 101 and a vertical mounting surface 102. The rotating electric machine 11 is fixed by fitting a mounting surface 81a of a fixing portion 81 of the upper mounting portion 71 in close contact with the horizontal mounting surface 101 of the underframe 100 and by fastening bolts (not shown) passing through mounting holes 81b and 81c and screwing into the underframe 100. The rotating electric machine 11 is fixed by having mounting surface 84a of fixing portion 84 of lower mounting portion 72 come into close contact with vertical mounting surface 102 of underframe 100 and fastening bolts (not shown) pass through mounting holes 84b, 84c and screw into underframe 100. When the rotating electric machine 11 is fixed to the underframe 100 of the bogie, stopper 73 is positioned above axle 14. Stopper 73 is used as a hoisting tool, and when rotating electric machine 11 falls off, stopper 73 abuts against axle 14 to prevent the rotating electric machine 11 from falling off.

[0036] Here, the upper mounting portion 71 is fixed to the outer circumferential surface of the stator 22 to connect the pair of stator pressing plates 47, 48 together, and also fixes the stator 22 to the frame 100 of the bogie, which serves as the mounting position of the rotating electric machine. The upper mounting portion 71 is made by casting, with a continuous structure from the fixing surface to the outer circumferential surface of the stator 22 to the fixing surface to the horizontal mounting surface 101 of the frame 100.

[0037] The lower mounting portion 72 is fixed to the outer circumferential surface of the stator 22 to connect the pair of stator pressing plates 47, 48 together, and also fixes the stator 22 to the frame 100 of the bogie, which serves as the mounting position for the rotating electric machine. The lower mounting portion 72 is made by casting, with a continuous structure from the fixing surface to the outer circumferential surface of the stator 22 to the fixing surface to the vertical mounting surface 102 of the frame 100.

[0038] <Modifications of the stator> Fig. 11 is a plan view showing a modified mounting state of a rotating electric machine, in which the rotating shaft 31 and the rotor 21 are omitted.

[0039] In the above explanation, as shown in FIG. 10 , the upper mounting portion 71 has the fixed portion 81 connected to the stator connecting portion 49 via two support connecting portions 82, 83, the stator connecting portion 49 and the support connecting portions 82, 83 are fixed to the outer periphery of the stator pressure plates 47, 48, and mounting holes 81b, 81c are provided on both sides of the support connecting portions 82, 83 in the fixed portion 81, but this configuration is not limited to this.

[0040] 11 shows a plan view of the rotating electric machine mounted on the frame of the bogie. As shown in FIG. 11, the upper mounting portion 71A has a fixed portion 81 connected to the stator connecting portion 49 via two support connecting portions 82 and 83. The stator connecting portion 49 is fixed to the outer periphery of the stator pressing plate 47 and 48. The support connecting portion 82 is fixed to the stator connecting portion 49 and is also fixed to the stator pressing plate 47. The support connecting portion 83 is fixed to the stator connecting portion 49, but is disposed at a position spaced a predetermined length from the stator pressing plate 48 and is not fixed to the outer periphery of the stator pressing plate 48. The fixed portion 81 has a mounting hole 81b provided on the outer side of the support connecting portion 8 and a mounting hole 81c provided between the support connecting portions 82 and 83. In this embodiment, since the upper mounting portion 71A is manufactured by casting, the positions of the support connecting portions 82, 83 and the fixing portion 81 relative to the stator connecting portion 49 can be manufactured in desired positions and shapes in accordance with the arrangement of the rotating electric machine 11. In other words, the upper mounting portion 71A can be manufactured in a complex shape.

[0041] <Modification of Rotating Electric Machine> Fig. 12 is a cross-sectional view showing the upper part of a modified example of a rotating electric machine. Note that members having the same functions as those in the configuration explained using Fig. 2 are given the same reference numerals and detailed explanations are omitted.

[0042] 12 shows the internal structure of the rotating electric machine cut along the direction of the rotation axis. As shown in FIG. 12, the rotating electric machine 11A includes a rotor 21 and a stator 22. The rotating electric machine 11A has a cooling fin 91 arranged on the outer surface of the stator connecting part 49. The upper mounting part 71 is configured by connecting a fixing part 81 to the stator connecting part 49 via support connecting parts 82 and 83. The cooling fin 91 is configured of a plurality of plates. The cooling fin 91 has a plurality of plates arranged between the support connecting parts 82 and 83 on the outer surface part of the stator connecting part 49. The cooling fin 91 has a plurality of plates arranged along the circumferential direction of the stator 22 and arranged at a predetermined interval in the axial direction of the stator 22 on the outer surface part of the stator connecting part 49.

[0043] When the rotor 21 rotates, the cooling fan 56 rotates, and outside air is taken in from the outside air inlet 62 into the cooling passage 66, and flows into the ventilation passage 67 and is discharged. The stator coupling part 49 is heated by the outside air that has increased in temperature by cooling the rotor 21 and the stator 22. Here, the stator coupling part 49 is cooled by the heat released from the cooling fan 56.

[0044] In the above description, the cooling fins 91 are arranged on the outer surface of the stator connecting portion 49 of the rotary electric machine 11A. However, cooling fins are also arranged on the outer surfaces of the other stator connecting portions 50, 51, and 52.

[0045] [Effects of the embodiment] The rotating electric machine of this embodiment includes a rotor 21, a stator 22 formed in a ring shape by stacking a number of magnetic plates on the outside of the rotor 21, a pair of stator pressure plates 47, 48 arranged in a ring shape on either side of the stacking direction of the stator 22, and an upper mounting portion 71 and a lower mounting portion 72 which are fixed to the outer peripheral surface of the stator 22 to connect the pair of stator pressure plates 47, 48 together and fix the stator 22 to the rotating electric machine mounting position, and which serve as a cast interface with a continuous structure from the fixing surface to the outer peripheral surface of the stator 22 to the fixing surface to the rotating electric machine mounting position.

[0046] Therefore, by producing the upper mounting portion 71, the lower mounting portion 72, the stopper 73, and the stator connecting portion 52 by casting, the manufacturing process can be simplified and reliability can be improved. Also, when the stator pressing plates 47, 48 are produced by, for example, pressing, no protrusions are required on the outer periphery side, improving material yield and reducing manufacturing costs.

[0047] In the rotating electric machine of this embodiment, the interface includes upper attachment portion 71 and lower attachment portion 72, which have stator connecting portions 49, 50 in which each end in the circumferential direction of stator 22 is bent toward the outer circumferential surface of stator 22 to form a fixing surface for the outer circumferential surface of stator 22, and each end of stator connecting portions 49, 50 in the axial direction of stator 22 is fixed to a pair of stator pressing plates 47, 48, respectively. Therefore, the upper attachment portion 71 and the lower attachment portion 72 can integrally connect the stator pressing plates 47, 48 to each other and the stator 22.

[0048] In the rotating electric machine of this embodiment, between the outer circumferential surface of the stator 22 and the stator connecting parts 49, 50 is a ventilation passage 67 through which cooling air flows in the axial direction of the stator 22, and one end side of the ventilation passage 67 in the axial direction of the stator 22 communicates with the inside of the rotating electric machine through the through hole 48a of one stator pressing plate 48 and the cooling passage 64, and the other end side of the stator in the axial direction opens to the outside of the rotating electric machine through the through hole 47a of the other stator pressing plate 47. Therefore, the stator 22 can be effectively cooled by the cooling air flowing through the ventilation passage 67.

[0049] In the rotating electric machine of this embodiment, the upper mounting portion 71 and the lower mounting portion 72 have fixing portions 81, 84 formed with mounting surfaces (fixing surfaces) 81a, 84a for fixing to the underframe 100 as the mounting position of the rotating electric machine, and the mounting surfaces 81a, 84a are machined surfaces that come into surface contact with the mounting surfaces 101, 102 of the underframe 100. Therefore, the fixing portions 81, 84 of the upper mounting portion 71 and the lower mounting portion 72 can fix the rotating electric machine 11 to the appropriate position of the underframe 100 with high precision.

[0050] In the rotating electric machine of this embodiment, the upper mounting portion 71 and the lower mounting portion 72 have support connecting portions 82, 83, 85, 86 that connect the stator connecting portions 49, 50 and the fixed portions 81, 84, and the support connecting portions 82, 83, 85, 86 are connected between the pair of stator pressing plates 47, 48 in a direction perpendicular to the stator connecting portions 49, 50 and the fixed portions 81, 84. Therefore, the rigidity of the upper mounting portion 71 and the lower mounting portion 72 can be improved, and the rotating electric machine 11 can be firmly fixed to the frame 100.

[0051] In the rotating electric machine of this embodiment, cooling fins 91 are arranged on the outer surface of the stator connecting portion 49. Therefore, the cooling fins 91 can dissipate heat from the stator 22 and efficiently cool it.

[0052] In the above embodiment, the upper mounting portion 71, the lower mounting portion 72, the stopper 73, and the stator connecting portion 52 are used as interfaces, but other interfaces may be used.

[0053] In the above embodiment, the rotating electric machine of the present embodiment has been described as a totally enclosed induction motor, but the present invention is not limited to this configuration.

[0054] Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0055] 10 Drive unit 11,11A rotating electric motor 12 Coupling 13 Reducer 14 axles 15 wheels 16 Drive shaft 17 Connection shaft 21 Rotor 22 Stator 31 Rotation axis 32 Rotor core 33 Stator core 34 Stator coil 35 void 41,43 Bearings 42,44 Bracket 45,46 Support part 47,48 Stator retainer plate 49,50,51 Stator connection part 52 Stator connection (interface) 53,55 Rotor retainer plate 54,56 Cooling fan 57,58 Bracket 59,60 Labyrinth Seal 61,62 Outside air intake 63 Outside air exhaust port 64 Cooling passage 65 Cover 66 Cooling passage 67 Ventilation duct 71 Upper mounting part (interface) 72 Lower mounting part (interface) 73 Stopper (Interface) 81,84 Fixed part 82,83,85,86 Support connection part 87,88 Locking part 91 Cooling fin 100 Frame (rotating motor mounting position) 101 Horizontal mounting surface 102 Vertical mounting surface

Claims

1. A rotor; a stator formed in an annular shape by stacking a plurality of magnetic plates on the outside of the rotor; a pair of stator presser plates arranged in an annular shape on both sides of the stator in the lamination direction; a cast interface fixed to an outer circumferential surface of the stator to connect the pair of stator pressing plates together and to fix the stator to an attachment position of a rotating electric machine, the cast interface having a continuous structure from a fixing surface to the outer circumferential surface of the stator to a fixing surface to the attachment position of the rotating electric machine, the interface has a stator connecting portion in which each end in the circumferential direction of the stator is bent toward the outer peripheral surface of the stator to form a fixing surface to the outer peripheral surface of the stator, and each end of the stator connecting portion in the axial direction of the stator is fixed to the pair of stator pressing plates, respectively. Rotating electric motor.

2. a ventilation passage through which cooling air flows in an axial direction of the stator between an outer peripheral surface of the stator and the stator connecting portion, one end side of the ventilation passage in the axial direction of the stator communicates with the inside of the rotating electric machine through a through hole of one of the stator pressing plates and a cooling passage, and the other end side of the ventilation passage in the axial direction of the stator opens to the outside of the rotating electric machine through a through hole of the other stator pressing plate, The rotating electric machine according to claim 1 .

3. the interface has a fixing portion having a fixing surface for fixing to the mounting position of the rotating electric machine, the fixing surface being a machined surface that comes into surface contact with a mounting surface of the mounting position of the rotating electric machine; The rotating electric machine according to claim 1 or 2.

4. The interface has a support connection portion that connects the stator connection portion and the fixed portion, and the support connection portion is connected between the pair of stator pressing plates in a direction perpendicular to the stator connection portion and the fixed portion. The rotating electric machine according to claim 3 .

5. A cooling fin is disposed on the outer surface of the stator coupling portion. The rotating electric machine according to any one of claims 1 to 4.

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