Stator core

Abstract

According to the present invention, a stator core capable of suppressing warpage of a metal plate when a bolt is fastened is provided. A stator core according to the present invention is a stator core formed by laminating a plurality of annular metal plates, and is provided with: a cylindrical base part; a protruding part which protrudes from the outer peripheral surface of the base part and in which an insertion hole through which a bolt is inserted is formed; and a welded part that fixes at least a first metal plate that is provided on the outer periphery of the protruding part and that is in contact with the head of the bolt when the bolt is fastened, and a second metal plate that is adjacent to the first metal plate.

Description

Technical Field

[0001] This invention relates to a stator core. Background Technology

[0002] Patent Document 1 discloses a method for manufacturing a stator core composed of a laminated structure made of multiple stacked metal plates. The method includes: a block stacking process to form multiple blocks made of stacked metal plates; and a welding process to stack the multiple blocks and weld adjacent blocks together in the stacking direction. In the welding process, welding is performed such that the length of the welded portion along the circumferential direction of the block is longer than its length along the stacking direction.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2021-027736 Summary of the Invention

[0004] On the stator core, multiple protrusions are formed at equal intervals in the circumferential direction, projecting outwards. Each of these protrusions has a hole through which a bolt is inserted. The bolt is inserted into the hole and tightened, thereby fixing the stator core to the housing.

[0005] When tightening bolts, the uppermost layer of the stator core may warp due to friction from the bolt head.

[0006] The present invention was made in view of such problems, and its object is to provide a stator core capable of suppressing warping of the metal plate during bolt tightening.

[0007] The stator core involved in this invention is a stator core made of multiple stacked annular metal plates, comprising: a cylindrical base portion; a protrusion portion protruding from the outer peripheral surface of the base portion and having a through hole for bolt insertion; and a welding portion that fixes at least a first metal plate and a second metal plate, wherein the first metal plate is disposed on the outer periphery of the protrusion portion and contacts the head of the bolt when the bolt is tightened, and the second metal plate is adjacent to the first metal plate.

[0008] The welding portion is provided in multiple portions at predetermined intervals on the outer periphery of the protrusion.

[0009] The welding section fixes the second metal plate and the third metal plate disposed on the side of the second metal plate opposite to the first metal plate.

[0010] The protrusions are provided in a plurality of manner along the circumference of the base portion, and the welding portion is provided on each of the plurality of protrusions.

[0011] Invention Effects

[0012] According to the present invention, a stator core capable of suppressing warping of the metal plate during bolt tightening can be provided. Attached Figure Description

[0013] Figure 1 This is a perspective view of the stator core involved in the implementation method.

[0014] Figure 2 Viewed from the y-axis direction Figure 1 A diagram of the protruding part of the stator core.

[0015] Figure 3 yes Figure 2 A three-dimensional image.

[0016] Figure 4 yes Figure 2 , 3 Sectional view IV-IV.

[0017] Figure 5 It is a diagram illustrating the warping of a metal plate caused by the tightening of bolts.

[0018] Figure 6 It is a diagram illustrating the warping of a metal plate caused by the tightening of bolts. Detailed Implementation

[0019] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. For clarity, appropriate omissions and simplifications have been made in the following descriptions and drawings. Furthermore, in each drawing, the same symbols are used to denote the same elements, and repeated descriptions have been omitted as necessary. Additionally, the xyz orthogonal coordinates shown in the drawings are for ease of explaining the positional relationships of the constituent elements.

[0020] The embodiment relates to a stator core for a rotating electric motor. The motor, for example, includes a housing, a stator core, and a rotor (neither shown). The generally cylindrical housing has a receiving portion for accommodating the stator core and rotatably supports the rotor. The stator core and rotor are arranged around the axis of the housing as a common axis. Hereinafter, the direction of extension of a straight line passing through the axis will be referred to as the axial direction, the direction orthogonal to this straight line will be referred to as the radial direction, and the direction of rotation about this straight line will be referred to as the circumferential direction.

[0021] Figure 1 This is a perspective view of the stator core 10 involved in the implementation method. Figure 2 Viewed from the y-axis direction Figure 1 The figure shows the protrusion 14 of the stator core 10. Figure 3 yes Figure 2 The three-dimensional diagrams are shown. In each diagram, the y-axis direction corresponds to the aforementioned axial direction.

[0022] The stator core 10 is formed by stacking multiple annular metal plates 11 in the y-axis direction. For example, electromagnetic steel plates such as silicon steel plates with insulating layers formed on both sides are used as the metal plates 11. By stacking multiple metal plates 11, such as… Figure 1 As shown, a base portion 12, teeth 13, and protrusions 14 are integrally formed. Multiple teeth 13 are configured to protrude radially inward from the inner circumferential surface of the cylindrical base portion 12. Space is created between adjacent teeth 13.

[0023] The protrusion 14 is configured to protrude radially outward from the outer peripheral surface of the base portion 12. Figure 1 In the example shown, the stator core 10 has three protrusions 14. The three protrusions 14 are formed at equal intervals in the circumferential direction of the base portion 12. A through hole 15 is formed in each protrusion 14. Figure 2 As shown, a bolt 20 for fixing the stator core 10 to the housing is inserted into the through hole 15.

[0024] The housing is a bottomed container with a generally cylindrical shape along its length in the axial direction and one end blocked in the axial direction. A generally cylindrical receiving portion is formed inside the housing. Within the receiving portion, a plurality of recesses corresponding to the protrusions 14 of the stator core 10 are provided at equal intervals in the circumferential direction. The recesses are indentations formed radially outward from the inner circumferential surface of the generally cylindrical receiving portion. The recesses extend axially from one end (opening) of the housing to the other end (bottom).

[0025] Multiple bolt fastening structures are provided at equal intervals in the circumferential direction on the housing and stator core 10. The bolt fastening structures include through holes 15 located on the protrusion 14 of the stator core 10 and fastening holes (not shown) located on the bottom of the housing. Bolts inserted into the through holes 15 are fastened along... Figure 2 Rotate and tighten the stator core 10 into the housing by rotating it in the direction of the arrow shown, thereby securing it to the housing.

[0026] A stator is constructed by winding coils (not shown) onto each tooth 13 of the stator core 10. Within the stator, a rotary electric motor is constructed by inserting a shaft through its center and arranging a rotor that holds multiple permanent magnets. The rotary electric motor functions as a motor that generates driving force, a generator that converts the rotational force of a shaft into electrical energy, or an electric generator combining both functions, for example, in electric vehicles or hybrid vehicles.

[0027] Between the protrusions 14, a welding portion 16 is provided on the outer peripheral side of the base portion 12. The welding portion 16 electrically connects the various metal plates 11. Alternatively, the welding portion 16 may be provided on the inner peripheral side of the base portion 12 instead of the outer peripheral side. Furthermore, in Figure 1In the example shown, the welded part 16 is arranged parallel to the axial direction (y-axis direction), but it does not necessarily need to be parallel to the axial direction. Furthermore, in Figure 1 In the example shown, two welding portions 16 are provided between the protrusions 14, but this is not a limitation. It is sufficient that at least one welding portion 16 is provided.

[0028] Figure 4 yes Figure 2 , 3 The IV-IV sectional view is shown. In the sectional view, the side with the head 21 of the bolt 20 is designated as the upper side, and the side with the front end of the shaft 22 that engages with the fastening hole of the housing is designated as the lower side. For illustration, the uppermost layer of the plurality of metal plates 11 is referred to as the first layer, the second layer, and so on. Furthermore, the uppermost layer (the first layer) of the plurality of metal plates 11 is referred to as the first metal plate 11a, the lower layer (the second layer) of the first metal plate 11a is referred to as the second metal plate 11b, and the lower layer (the third layer) of the second metal plate 11b is referred to as the third metal plate 11c.

[0029] like Figure 4 As shown, a shaft 22 with a bolt 20 inserted into the through hole 15. When the bolt 20 is tightened, the head 21 of the bolt 20 contacts the uppermost first metal plate 11a.

[0030] like Figure 3 , 4 As shown, a welded portion 30 is provided on the outer periphery of the protrusion 14. (Reference) Figure 4 The welded part 30 is fixed at least to the first metal plate 11a that contacts the head 21 of the bolt 20 when the bolt 20 is tightened, and the second metal plate 11b that is adjacent to the first metal plate 11a.

[0031] Figure 5 , 6 This diagram illustrates the warping of the metal plate 11 caused by the tightening of bolt 20. (See diagram for example.) Figure 5 As shown, when the head 21 of the bolt 20 is in contact with the first metal plate 11a, if the bolt 20 rotates, the head 21 rubs against the first metal plate 11a, generating a frictional force FR1. Through this frictional force FR1, such as... Figure 6 As shown, the first metal plate 11a may warp in the protrusion 14.

[0032] In the implementation method, such as Figure 4 As shown, at least the first metal plate 11a and the second metal plate 11b are fixed together by a welding part 30. This helps to suppress warping of the first metal plate 11a. Furthermore, the welding part 30 can also fix the second metal plate 11b and the third metal plate 11c disposed on the side of the second metal plate 11b opposite to the first metal plate 11a.

[0033] exist Figure 4 In the example shown, the welding part 30 fixes the metal plates 11 between the first and second layers, between the second and third layers, and between the third and fourth layers. In this way, by fixing the multiple metal plates 11 in the protrusion 14 with the welding part 30, warping of the metal plates 11 can be further prevented when the bolts 20 are tightened.

[0034] Furthermore, multiple welded portions 30 may be provided at predetermined intervals around the outer periphery of the protrusion 14. For example, such as Figure 3 As shown, welding portions 30 can be provided at the first position P1 connecting the protrusion 14 and the base portion 12, the second position P2 of the protrusion 14 furthest from the base portion 12, and the third position P3 between the first position P1 and the second position P2. Furthermore, the position or number of welding portions 30 in the protrusion 14 is not limited to... Figure 3 For example, by providing multiple welded portions 30 around the outer periphery of the protrusion 14, warping of the first metal plate 11a can be further suppressed.

[0035] Furthermore, the welding portion 30 can also be provided on each of the plurality of protrusions 14 provided circumferentially along the base portion 12. That is, as shown in the figure. Figure 1 As shown, a welding portion 30 can be provided on each of the three protrusions 14. This can suppress the warping of the metal plate 11 of each of the multiple protrusions 14.

[0036] In addition, the welding area at each welded part 30 or the number of welded parts 30 can be appropriately determined so that the metal plate 11 will not warp when the bolt 20 is tightened.

[0037] The present invention has been described above with reference to the embodiments described above, but the present invention is not limited to the above embodiments. The present invention is not limited to the above embodiments, and appropriate modifications can be made without departing from the spirit of the invention.

[0038] Symbol Explanation

[0039] 10-Stator core, 11-Metal plate, 12-Base, 13-Gear, 14-Protrusion, 15-Through hole, 16-Welding part, 20-Bolt, 21-Head, 22-Shaft, 30-Welding part.

Claims

1. A stator core, comprising multiple stacked annular metal plates, characterized in that, have: Cylindrical base portion; A protrusion, which protrudes from the outer peripheral surface of the base portion and has a through hole for inserting a bolt; and A welding section that fixes at least a first metal plate and a second metal plate, the first metal plate being disposed on the outer periphery of the protrusion and in contact with the head of the bolt when the bolt is tightened, the second metal plate being adjacent to the first metal plate.

2. The stator core according to claim 1, characterized in that, The welding portion is provided in multiple portions at predetermined intervals on the outer periphery of the protrusion.

3. The stator core according to claim 1, characterized in that, The welding section fixes the second metal plate and the third metal plate disposed on the side of the second metal plate opposite to the first metal plate.

4. The stator core according to claim 1, characterized in that, The protrusions are provided in multiple directions along the circumference of the base portion. The weld portion is provided on each of the plurality of protrusions.

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