Rotating electric machine

Abstract

A rotating electrical machine includes a stator including a stator core having a plurality of slots, and a bobbin fitted into the slots, the bobbin having flange portions respectively provided at both axial ends of the stator and protruding strip portions respectively provided on the flange portions, and the stator core having protruding portions protruding from inner surfaces of the slots. The reel is positioned by the engagement of the protruding strip portion and the protruding portion.

Description

Technical Field

[0001] The present invention relates to a rotating electric machine such as an electric motor, and more particularly to a rotating electric machine used in industrial machinery. Background Art

[0002] A rotating electric machine is being developed that uses a segmented coil with a flat cross-section rectangular wire as a conductor to improve the winding filling rate of the stator, and to achieve high power density and miniaturization. In this rotating electric machine, the segmented segmented coils are fitted into a plurality of coil insertion holes formed in a winding frame provided in a slot of the stator, thereby achieving further miniaturization, high productivity, and low cost.

[0003] Patent Document 1 describes a structure in which a recess is provided on a back yoke of a stator core, a protrusion is provided on a winding frame, and the winding frame is positioned by fitting the protrusion into the recess.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2016-208730 Summary of the invention

[0007] Technical problem to be solved by the invention

[0008] When the divided segment coils are inserted into the winding frame provided in the slots of the stator, the winding frame moves in the radial and axial directions and is misaligned, which results in poor workability and reduced productivity.

[0009] Furthermore, if the coil is inserted into a bobbin whose position is misaligned, the coil may hit the wall of the bobbin, and the bobbin may be damaged.

[0010] In the structure of Patent Document 1, the protrusion of the winding frame needs an angle in order to fit it into the recess. If the angle is large, the force required for press-in increases, and the risk of damage to the winding frame increases. If the protrusion is damaged at any position in the axial direction, it is difficult to confirm the position after assembly, which poses a problem in reliability.

[0011] The bobbin positioning for improving the workability when inserting the segmented segment coils into the bobbin provided in the slots of the stator is required to be realized with a structure with a low risk of damage.

[0012] An object of the present invention is to position a winding frame in a rotating electrical machine while ensuring both workability and reliability.

[0013] Technical solutions to solve problems

[0014] A rotating electric machine in one embodiment of the present invention has a stator and a rotor configured to rotate around a rotating shaft as a central axis, wherein the stator includes: a stator core having a plurality of slots; and a winding frame embedded in the slots, the winding frame having: flange portions respectively arranged at both ends of the axial direction of the stator; and protrusion portions respectively arranged on the flange portions, the stator core has a protrusion portion protruding from the inner surface of the slot, and the winding frame is positioned by engaging the protrusion portion with the protrusion portion.

[0015] Effects of the Invention

[0016] According to one aspect of the present invention, in a rotating electrical machine, the bobbin can be positioned while ensuring both workability and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1A It is a perspective view of the rotating electrical machine 100 according to the first embodiment.

[0018] Figure 1B is a radial cross-sectional view of the rotating electrical machine 100 .

[0019] Figure 2A This is a perspective view of the coil 5 in the middle of being assembled.

[0020] Figure 2B It is a perspective view of the coil 5 after assembly.

[0021] Figure 3A It is a perspective view of the winding frame 20.

[0022] Figure 3B yes Figure 3A A partial enlarged view of .

[0023] Figure 3C It is a side view of the winding frame 20.

[0024] Figure 3D yes Figure 3C A partial enlarged view of .

[0025] Figure 4A It is a perspective view of the stator core 4 .

[0026] Figure 4B It is a top view of the stator core 4 .

[0027] Figure 4C yes Figure 4B A partial enlarged view of .

[0028] Figure 5A It is a perspective view when the bobbin 20 is inserted into the slot 7 of the stator core 4 .

[0029] Figure 5BThis is a perspective view after all the bobbins 20 are inserted into the slots 7 of the stator core 4 .

[0030] Figure 5C This is a cross-sectional view after all the bobbins 20 are inserted into the slots 7 of the stator core 4 .

[0031] Figure 5D This is a perspective view of a state where convex segment coil 11 and concave segment coil 12 are inserted into bobbin 20 .

[0032] Figure 5E It is a perspective view of stator 6 after all convex segment coils 11 and concave segment coils 12 are inserted.

[0033] Fig. 5F This is a perspective view when the protrusion radial direction outer side surface 31 of the protrusion 23 and the protrusion radial direction inner side surface 34 of the protrusion 24 are in contact with each other.

[0034] Figure 5G yes Fig. 5F Cross-sectional view in .

[0035] Figure 5H It is a perspective view showing a state where the ridge 24 and the protrusion 23 are in contact with each other in the axial direction.

[0036] Fig.5I This is a perspective view when the protrusion radial direction inner side surface 31 of the protrusion 23 and the protrusion radial direction inner side surface 34 of the protrusion 24 are in contact with each other.

[0037] Figure 5J yes Fig.5I Cross-sectional view of .

[0038] Fig. 6A It is a top view of the tooth 9 of the second embodiment.

[0039] Figure 6B It is a partially enlarged view of a top view of the core back portion 10 .

[0040] Figure 6C It is a perspective view of the stator core 4 during assembly.

[0041] Fig.6D It is a partially enlarged view of a top view of the stator core 4 .

[0042] Fig. 7A This is a perspective view of convex-side stator 25 into which convex segment coil 11 according to the third embodiment is inserted.

[0043] Figure 7B yes Fig. 7A A partial enlarged view of .

[0044] Figure 7C It is a perspective view of concave-side stator 26 into which concave segment coil 12 is inserted.

[0045] Fig.7D yes Figure 7C A partial enlarged view of .

[0046] Fig. 7E This is a perspective view of the rotating electrical machine 100 in the process of being assembled, which is formed by combining the convex-side stator 25 and the concave-side stator 26 .

[0047] Figure 7F It is a perspective view of the rotating electrical machine 100 after assembly. DETAILED DESCRIPTION

[0048] Hereinafter, embodiments of the present invention will be described using the accompanying drawings. However, the present invention is not limited to the description of the embodiments shown below for explanation. It is easy for those skilled in the art to understand that the specific structure can be changed without departing from the scope of the thought or purpose of the present invention.

[0049] In addition, in each figure for explaining the embodiment, the same components are denoted by the same names and reference numerals, and their repeated description is omitted.

[0050] This embodiment is for an internal-type rotating electric machine. The coil is a distributed winding, and is formed by fitting the segmented coils into a plurality of coil insertion holes formed in a winding frame provided in a slot of a stator. The rotor may be a buried magnet type rotor formed by inserting magnets into the magnet insertion holes in a rotor core having a plurality of magnet insertion holes, or a surface magnet type rotor formed by attaching magnets to the surface of a rotor core. In addition, it may be an induction motor, a synchronous reluctance motor, or a switched reluctance motor that does not use magnets.

[0051] Example 1

[0052] Reference Figure 1A to Figure 5J , Example 1 of the present invention is described.

[0053] Figure 1A is a perspective view of the rotating electrical machine 100, Figure 1B is a radial cross-sectional view of the rotating electrical machine 100 .

[0054] The outward-type rotating electric machine 100 includes a rotor 3 composed of a rotor core (rotor iron core) 1 and a permanent magnet 2, and a stator 6 composed of a stator core (stator iron core) 4 and a coil 5, arranged with a predetermined gap on the inner diameter side of the rotor 3. The rotor 3 is rotatably arranged with a rotating shaft 90 as the central axis.

[0055] Figure 2A This is a perspective view of the coil 5 during assembly. Figure 2B It is a perspective view of the coil 5 after assembly.

[0056] Coil 5 is formed by fitting convex segment coil 11 and concave segment coil 12 into a plurality of coil insertion holes 22 formed in bobbin 20 provided in slot 7 of stator 6 .

[0057] Figure 3A is a three-dimensional diagram of the winding frame 20, Figure 3B yes Figure 3A A partial enlarged view of . Figure 3C is a side view of the winding frame 20, Figure 3D yes Figure 3C A partial enlarged view of .

[0058] The winding frame 20 has a plurality of coil insertion holes 22 extending in the axial direction, and has flanges 21 at both ends in the axial direction. In addition, the flanges 21 have protrusions 23 on the surface side that contacts the stator core 4. The winding frame 20 is produced by injection molding (injection molding) of an elastic material such as resin. By being produced from an elastic material, the flange 21 can be moved to the stator core 4. Figure 3D bends in the direction of the arrow.

[0059] Figure 4A is a three-dimensional diagram of the stator core 4, Figure 4B It is a top view of the stator core 4 . Figure 4C yes Figure 4B A partial enlarged view of .

[0060] The stator core 4 is composed of a core back 10 and teeth 9 extending in the inner diameter direction of the core back 10. The inner surfaces of the slots 7 sandwiched by the teeth 9 of the stator core 4 have protrusions 24. 30 is an end surface of the stator core 4.

[0061] Figure 5A is a perspective view of inserting the winding frame 20 into the slot 7 of the stator core 4. Figure 5B This is a perspective view after all the bobbins 20 are inserted into the slots 7 of the stator core 4 . Figure 5C is a cross-sectional view after all the winding frames 20 are inserted into the slots 7 of the stator core 4. Figure 5D This is a perspective view of convex segment coil 11 and concave segment coil 12 inserted into bobbin 20 . Figure 5E It is a perspective view of stator 6 after all convex segment coils 11 and concave segment coils 12 are inserted.

[0062] Fig. 5F This is a perspective view when the protrusion radial direction outer side surface 31 of the protrusion 23 and the protrusion radial direction inner side surface 34 of the protrusion 24 are in contact with each other. Figure 5G This is a cross-sectional view at this time. Figure 5H The flange 21 is Figure 3D A perspective view showing a state in which the flange 35 is bent in the direction of the arrow and elastically deformed, and the protrusion 24 and the projection 23 are in contact with each other in the axial direction. Fig.5IThis is a perspective view of a state where the protrusion radial direction inner side surface 31 of the protrusion 23 is in contact with the protrusion radial direction inner side surface 34 of the protrusion 24 . Figure 5J This is a cross-sectional view at this time.

[0063] The bobbin 20 has flanges 21 at both ends in the axial direction, so it cannot be inserted into the slot 7 of the stator core 4 from the axial direction. The bobbin 20 is inserted into the slot 7 of the stator core 4 from the radial direction. When inserted from the radial direction, the radial outer side surface 31 of the protrusion 23 abuts against the radial inner side surface 34 of the protrusion 24, but when further pressed in, the flange 21 moves in the direction of the protrusion 24. Figure 3D The rib 24 is bent in the direction of the arrow, so that the protrusion 24 contacts the protrusion 23 in the axial direction. When further pressed in from here, the flange 21 recovers its original shape, and the protrusion radial inner side surface 31 of the protrusion 23 contacts the protrusion radial outer side surface 34 of the protrusion 24.

[0064] Thus, stator core 4 is radially engaged with bobbin 20. With this structure, the bobbin is fixed in the axial direction and the radial direction, so that workability when inserting convex segment coil 11 and concave segment coil 12 is improved, and productivity is improved.

[0065] Example 2

[0066] Reference Figure 6A to Figure 6D , Example 2 of the present invention is described.

[0067] Fig. 6A is a top view of tooth 9, Figure 6B It is a partially enlarged view of a top view of the core back portion 10 . Figure 6C This is a perspective view of the stator core 4 during assembly. Fig.6D It is a partially enlarged view of a top view of the stator core 4 .

[0068] The stator core 4 is formed by separating the teeth 9 and the core back 10 (into separate parts) and inserting the teeth 9 into the tooth insertion slots 13 of the core back 10 from the axial direction. By separating the teeth 9 and the core back 10, for example, amorphous materials are used for the teeth 9 and electromagnetic steel sheets are used for the core back 10. Thus, the loss generated in the teeth 9 can be reduced.

[0069] Even when the teeth 9 and the core back portion 10 are made of the same material, it is possible to reduce excess material generated when the shape of the integrated stator core 4 is produced by punching or the like.

[0070] At this time, as described in Patent Document 1, if a recess is provided at the root where the tooth 9 and the core back 10 are in contact, the contact area between the tooth 9 and the core back 10 is reduced, and the holding strength of the tooth 9 is weakened.

[0071] In the second embodiment, the engagement portion between the stator core 4 and the bobbin 20 is located at the center of the slot 7 , and the contact surface between the tooth 9 and the core back portion 10 does not become smaller.

[0072] Furthermore, as described in Patent Document 1, if a recessed portion is provided at the root portion where the tooth 9 and the core back portion 10 are in contact, the magnetic flux does not pass through the recessed portion, the magnetic resistance increases, and the efficiency decreases.

[0073] In the second embodiment, the engagement portion between the stator core 4 and the winding frame 20 is located at the center of the slot 7, thereby forming a flow 14 of magnetic flux (see Fig.6D ), compared with the structure with a recessed portion at the root, the magnetic resistance becomes smaller and the efficiency becomes better.

[0074] Since the assembly of teeth 9 and core back 10 , the insertion of bobbin 20 after stator core 4 is formed, and the insertion of convex segment coil 11 and concave segment coil 12 are the same as those in Embodiment 1, description thereof will be omitted.

[0075] Example 3

[0076] Reference Figure 7A to Figure 7F , Example 3 of the present invention is described.

[0077] Fig. 7A is a perspective view of the convex side stator 25 into which the convex segment coil 11 is inserted. Figure 7B yes Fig. 7A A partial enlarged view of . Figure 7C is a perspective view of the concave side stator 26 into which the concave segment coil 12 is inserted. Fig.7D yes Figure 7C A partial enlarged view of . Fig. 7E This is a perspective view of the rotating electrical machine 100 in the middle of being assembled by combining the convex side stator 25 and the concave side stator 26. Figure 7F It is a perspective view of the rotating electrical machine 100 after assembly.

[0078] Convex side stator 25 is constructed by inserting bobbin 20 into slot 7 of stator core 4 from the radial direction and then inserting convex segment coil 11 into coil insertion hole 22. At this time, bobbin 20 is fixed in the axial direction and the radial direction as in Embodiment 1, so workability is good.

[0079] Concave stator 26 is constructed by inserting bobbin 20 into slot 7 of stator core 4 from the radial direction and then inserting concave segment coil 12 into coil insertion hole 22. At this time, bobbin 20 is fixed in the axial direction and the radial direction as in Embodiment 1, so workability is good.

[0080] Convex portion 27 of convex segment coil 11 and concave portion 28 of segment coil 12 can be visually confirmed from the axial end surface. Thus, when assembling convex stator 25 and concave stator 26, convex portion 27 (see FIG. 2 ) can be visually confirmed. Figure 7B ) and recess 28 (refer to Fig.7D) can be assembled while being correctly fitted. Therefore, fitting failure does not occur and reliability can be improved.

[0081] Furthermore, the bobbin 20 is fixed in the axial and radial directions, thereby preventing the bobbin 20 from being displaced when the male and female stators 25 and 26 are turned over during assembly, thereby improving workability.

[0082] The mating surface between convex stator 25 and concave stator 26 requires a structure that ensures a creepage distance for insulating convex segment coil 11 and concave segment coil 12 from stator core 4 . In this structure, flange 21 can ensure the creepage distance.

[0083] According to the above embodiment, the bobbin can be positioned by engaging the protrusion extending in the axial direction from the flange of the bobbin with the protrusion extending in the radial direction from the inner surface of the slot. Therefore, the workability when inserting the divided segment coil is improved, and the productivity is improved.

[0084] Furthermore, by arranging the protrusion of the winding frame on the back side of the flange portion that is easily elastically deformed, the risk of damage to the winding frame is reduced and reliability is improved. Even if the winding frame is damaged during insertion, it can be easily found by visual inspection because the elastically deformed part is the axial end face.

[0085] As described above, according to the above-described embodiment, in the rotating electrical machine, the bobbin can be positioned while ensuring both workability and reliability.

[0086] Description of Reference Numerals

[0087] 1 rotor core

[0088] 2 permanent magnets

[0089] 3 rotors

[0090] 4 stator core

[0091] 5 coils

[0092] 6 Stator

[0093] 7 slots

[0094] 8-axis

[0095] 9 teeth

[0096] 10 core back

[0097] 11 convex segmented coil

[0098] 12 concave segmented coil

[0099] 13 teeth inserted into the groove

[0100] 14 Flow of magnetic flux

[0101] 20 Winding rack

[0102] 21 Flange

[0103] 22 Coil insertion holes

[0104] 23 protrusions

[0105] 24 protrusions

[0106] 25 convex side stator

[0107] 26 Concave side stator

[0108] 27 convex part

[0109] 28 recesses

[0110] 29 Contact surface of winding frame

[0111] 30 End face of stator core

[0112] 31 radial outer side of the protrusion

[0113] 32 radial inner side of the protrusion

[0114] 33 radial outer side of the protrusion

[0115] 34 radial inner side of the protrusion

[0116] 35 Elastic deformation flange

[0117] 90° rotation axis

[0118] 100 rotation motor.

Claims

1. A rotating electric machine comprising a stator and a rotor arranged to be rotatable about a rotating shaft as a central axis, wherein: The stator comprises: a stator core having a plurality of slots; and A winding frame embedded inside the groove, The winding frame has: Flange portions respectively provided at both ends of the stator in the axial direction; and protrusions respectively provided on the flanges, The stator core has a protrusion protruding from an inner surface of the slot, The bobbin is positioned by the engagement of the protrusion and the projection.

2. The rotating electrical machine according to claim 1, characterized in that: The protruding stripe portion is provided on the flange portion so as to be located on a contact surface respectively in contact with an end surface of the stator core and to extend in the axial direction.

3. The rotating electrical machine according to claim 1, characterized in that: The flange portion is configured to be elastically deformable, The protrusion portion of the bobbin is provided on the back side of the flange portion.

4. The rotating electrical machine according to claim 3, characterized in that: The flange portion is made of an elastic material that is bendable in a predetermined direction.

5. The rotating electrical machine according to claim 1, characterized in that: The bobbin has a plurality of coil insertion holes extending in the axial direction. In a state where the bobbin is positioned, the convex segment coil and the concave segment coil are fitted inside the coil insertion hole.

6. The rotating electrical machine according to claim 1, characterized in that: The stator has a core back and a plurality of teeth extending in an inner diameter direction of the core back. The groove is clamped by the teeth, The protrusion is arranged on the inner surface of the groove, The bobbin is inserted into the slot from a radial direction of the stator.

7. The rotating electrical machine according to claim 6, characterized in that: By inserting the bobbin into the groove from the radial direction, the radial inner side surface of the protrusion contacts the radial outer side surface of the projection, so that the protrusion and the projection engage with each other, and the bobbin is fixed in the axial direction and the radial direction.

8. The rotating electrical machine according to claim 6, characterized in that: The protrusion portion is engaged with the projection portion at a center portion of the groove.

9. The rotating electrical machine according to claim 6, characterized in that: The core back and the teeth are respectively composed of different parts, The stator core is constructed by embedding the teeth into the core back.

10. The rotating electrical machine according to claim 9, characterized in that: The core back has a tooth insertion groove, The teeth are embedded in the core back by inserting the teeth into the teeth insertion grooves from the axial direction.

11. The rotating electrical machine according to claim 9, characterized in that: The teeth are made of amorphous material, The core back is formed of an electromagnetic steel sheet.

12. The rotating electrical machine according to claim 1, characterized in that: The stator core is composed of a first stator core and a second stator core. The winding frame is respectively embedded in the first stator core and the second stator core, The first stator core and the second stator core are connected to each other via the flange portion.

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