JP2019170084A - Stator structure, rotary electric machine with stator structure, and vehicle with stator structure - Google Patents

Abstract

To improve an insertion property of a coil into an open slot.SOLUTION: Stator structure is provided with: a stator core 20 which has a plurality of open slots 28, and around which a segment coil 22a is wound by being inserted into the open slots 28; and insulation paper 32 which is interposed between the open slots 28 and the segment core 22a, in the open slots 28, a pair of projections 30, 30 which face each other are formed at an inner peripheral part of the open slots 28 by differentiating dimensions of circumferential direction width (W1) of an outer peripheral area and circumferential direction width (W2) of an inner peripheral area of the stator core 20, and projection amounts (P) of the respective projections 30 are substantially the same as thickness (T) in a circumferential direction of the insulation paper 32.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a stator structure, a rotating electric machine including the stator structure, and a vehicle including the stator structure.

  Conventionally, a rotating electrical machine has been used as a power source for hybrid vehicles and electric vehicles. This rotating electrical machine is configured to include a stator. This stator includes an annular stator core, insulating paper, and a coil (conductive wire). The insulating paper is disposed in the open slot along the inner surface of the open slot. The coil is inserted into the open slot, and is disposed in the open slot through insulating paper.

  When manufacturing the stator, first, insulating paper is inserted into the open slot, and the shape of the insulating paper is adjusted along the inner surface of the open slot. Next, the coil is inserted and placed in the open slot. When the coil is inserted into the open slot, the coil interferes (contacts) with both ends of the insulating paper at the entrance of the open slot, and the insulating paper is displaced from the inner surface of the open slot.

  Therefore, in Patent Document 1, a connecting portion that connects adjacent insulating papers is formed in advance, a coil is inserted into the open slot, and then the connecting portion is cut to separate the insulating paper for each open slot. Finally, both ends of the separated insulating paper are folded into an open slot to cover the coil.

Japanese Patent No. 4973420

  However, in the stator structure disclosed in Patent Document 1, when the coil is inserted into the open slot, the connecting portion of the insulating paper is exposed to the outside of the teeth. Thereby, when inserting a coil in an open slot, there exists a possibility that a coil may contact the connection part of insulating paper.

  As a result, in the stator structure disclosed in Patent Document 1, there is a concern about the insertability of the coil into the open slot.

  The present invention has been made in view of the above points, and includes a stator structure capable of further improving the insertability of a coil into an open slot, a rotating electrical machine including the stator structure, and the stator structure. The purpose is to provide a vehicle.

  In order to achieve the above object, the present invention is provided between a stator core having a plurality of slots and having a segment coil inserted and wound in the slot, and between the slot and the segment coil. An insulating sheet, and the slot is formed of an open slot that is widened at least wider than the circumferential width of the segment coil, and the circumferential width of the outer circumferential area of the stator core and the circumferential width of the inner circumferential area of the slot The protrusions are formed on the inner peripheral portion of the slot, and the protrusion amount of the protrusion is substantially the same as the thickness of the insulating sheet and the circumferential direction. .

  According to the present invention, it is possible to obtain a stator structure that can further improve the insertability of a coil into an open slot, a rotating electrical machine that includes this stator structure, and a vehicle that includes this stator structure.

1 is a schematic cross-sectional view of a rotating electrical machine to which a stator structure according to an embodiment of the present invention is applied. It is a partial expanded sectional view of the stator shown in FIG. FIG. 3 is an enlarged cross-sectional view in which some segment coils are omitted from one open slot shown in FIG. 2. It is a cross-sectional schematic diagram which shows the crease width | variety of insulating paper. It is a cross-sectional schematic diagram which shows the modification of the crease | fold shape of insulating paper. It is a cross-sectional schematic diagram which shows the inner diameter side insertion clearance of a coil. It is a cross-sectional schematic diagram which shows the comparative example which the present applicant devised.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. FIG. 1 is a schematic cross-sectional view of a rotating electrical machine to which a stator structure according to an embodiment of the present invention is applied.

  As shown in FIG. 1, a rotating electrical machine 10 to which a stator structure according to an embodiment of the present invention is applied includes a casing 12, a stator 14, a rotor 16, and a shaft (output shaft) 18. ing.

  The rotating electrical machine 10 is a traveling motor mounted on a vehicle such as a hybrid vehicle or an electric vehicle. In addition, this rotary electric machine 10 is not limited to a motor for driving | running | working, For example, it can apply also to motors for other uses, such as a power generation motor mounted in a vehicle. The rotating electrical machine 10 is a rotating electrical machine mounted other than a vehicle, and is applied to so-called rotating electrical machines including a generator.

  The casing 12 is formed in a cylindrical shape that can accommodate the stator 14 and the rotor 16, for example. The stator 14 has an annular shape and is attached to the inner peripheral surface of the casing 12, for example. The stator 14 applies a rotating magnetic field to the rotor 16.

  The rotor 16 includes, for example, a rotor core (not shown) and a magnet (not shown) attached to the rotor core, and is disposed inside the stator 14 and driven to rotate.

  The shaft 18 is connected to the rotation center of the rotor 16 and outputs the rotational force of the rotor 16 as a driving force.

  FIG. 2 is a partial enlarged cross-sectional view of the stator shown in FIG.

  As shown in FIG. 2, the stator 14 includes a stator core 20 and a coil 22 attached to the stator core 20. The stator core 20 is configured in an annular shape surrounding the rotor 16. In addition, the stator core 20 is formed, for example, by dividing a plurality of pieces divided in the circumferential direction to be connected to each other, or by laminating a plurality of electromagnetic steel plates in the axial direction. Any of the laminated stator cores may be used.

  The stator core 20 has an annular yoke 24, a plurality of teeth 26, and a plurality of open slots 28. The plurality of teeth 26 are formed so as to protrude from the yoke 24 toward the radially inner side of the stator core 20.

  The open slot 28 is formed between two teeth 26 and 26 adjacent to each other in the circumferential direction of the stator core 20. The open slot 28 is formed so as to penetrate the stator core 20 along the axial direction of the stator core 20. The open slot 28 is formed to extend along the radial direction of the stator core 20. The inner peripheral surface side along the radial direction of the open slot 28 is open. The outer peripheral surface side along the radial direction of the open slot 28 is formed so as to be closed.

  The coil 22 is accommodated in the open slot 28 of the stator core 20 and attached to the stator core 20. The coil 22 is composed of a three-phase coil including a U phase, a V phase, and a W phase. The coil 22 includes a plurality of segment coils 22a that are connected to each other. One segment coil 22a has a plurality of conducting wires. The plurality of conductive wires are arranged in series in the radial direction in the open slot 28.

  FIG. 3 is an enlarged cross-sectional view in which some segment coils are omitted from one open slot shown in FIG.

  A pair of projecting portions 30 and 30 projecting in the circumferential direction toward each other with an open slot 28 therebetween are provided at the tips of the inner diameter end portions of the adjacent teeth 26 and 26. An insulating paper (insulating sheet) 32 is interposed between the open slot 28 and the segment coil 22a.

  The pair of protrusions 30 and 30 are opposed to each other in the circumferential direction, and are formed to have the same dimension along the radial direction. Each protrusion 30 is formed in the open slot 28 by making the dimension of the circumferential width (W1) of the outer peripheral area of the stator core 20 different from the dimension of the circumferential width (W2) of the inner peripheral area. . That is, in the present embodiment, in the open slot 28, the dimension of the circumferential width (W1) of the outer peripheral area of the stator core 20 is made larger than the dimension of the circumferential width (W2) of the inner peripheral area (W1> W2). The pair of protrusions 30 is formed by this dimensional difference (W1-W2). The protrusion amount (P) of each protrusion 30 is formed to be substantially the same (P≈T) as the insulating paper 32 and the thickness (T) in the circumferential direction.

  By forming the protrusion 30 at the inner diameter end of the tooth 26, a step 34 is formed between the side surface of the open slot 28 and the upper surface of the protrusion 30. The step 34 locks the lower end (tip) of the insulating paper 32 inserted into the open slot 28 and prevents the insulating paper 32 from being pulled out of the open slot 28 to the outside.

  The rotating electrical machine 10 to which the stator structure according to the present embodiment is applied is basically configured as described above. Next, the function and effect will be described.

  In the present embodiment, the dimension of the circumferential width (W1) of the outer peripheral region of the stator core 20 is set to be larger than the circumferential width (W2) of the inner peripheral region of the stator core 20 (W1> W2). Thereby, in this embodiment, a pair of protrusion parts 30 and 30 which protrude along the circumferential direction and oppose each other are formed at the tips of the inner diameter end parts of the adjacent teeth 26 and 26. As a result, in this embodiment, when the insulating paper 32 is inserted into the open slot 28, the lower end (tip) of the insulating paper 32 is locked by the stepped portion 34 that is the upper surface of the protruding portion 30.

  In this case, compared with the case where the connecting portion as in the prior art is provided, in this embodiment, the insulating paper 32 is not exposed outside the open slot 28 and the segment coil 22a is inserted into the open slot 28. Interference with the insulating paper 32 can be preferably avoided. As a result, in this embodiment, the insertability of the coil 22 (segment coil 22a) into the open slot 28 can be further improved.

  Further, as shown in FIG. 3, in the present embodiment, the protrusion amount (P) of the protrusions 30 protruding toward the opposing sides is substantially the same as the circumferential thickness (T) of the insulating paper 32 ( P≈T). As a result, the slot clearance (SC) formed in the gap between the insulating paper 32 and the stator core 20 can be reduced (the tooth width between the adjacent teeth 26, 26 (same as W2) can be increased). . Therefore, in this embodiment, the coil occupation ratio in the open slot 28 can be increased by approximating the slot clearance (SC) to zero as much as possible. As a result, in this embodiment, the protrusion amount (P) of each protrusion 30 is substantially the same (P≈T) as the circumferential thickness (T) of the insulating paper 32, so that the coil in the open slot 28 is The occupation ratio can be maximized.

  It should be noted that the segment coil 22a can be reliably inserted into the open slot 28 by making the protrusion amount (P) of each protrusion 30 slightly thicker than the circumferential thickness (T) of the insulating paper 32. There are advantages.

FIG. 7 is a schematic cross-sectional view showing a comparative example devised by the present applicant.
In this comparative example, the projecting amount (P) of the projecting portion 30 projecting toward each other facing each other is set larger than the circumferential thickness (T) of the insulating paper 32 (P >> T). Thereby, in the comparative example, the slot clearance (SC) formed in the gap between the insulating paper 32 and the stator core 20 is increased, and the coil occupancy in the open slot 28 is reduced as compared with the present embodiment.

  Furthermore, in this embodiment, two folds are formed in the insulating paper 32 along the axial direction of the stator core 20. The fold width (FW) between the two folds of the insulating paper 32 is not less than the circumferential width (W3) of the segment coil 22a and not more than the circumferential width (W4) of the open slot 28, as shown in FIG. Each may be set (W3 ≦ FW ≦ W4). The crease shape of the insulating paper 32 is arbitrary. For example, a crease shape in which the sides on both sides of the center side are orthogonal to each other, or a tapered crease shape portion 36 (see FIG. 5) on both sides of the center side may be provided.

  Furthermore, in this embodiment, as shown in FIG. 6, the width dimension between the pair of protrusions 30, 30 is set to a width dimension that can secure the inner diameter side insertable clearance (CL) of the coil 22. Yes. The inner diameter side insertable clearance (CL) is obtained by adding the width direction clearance CL1 between the one side projection 30 and the segment coil 22a and the width direction clearance CL2 between the other side projection 30 and the segment coil 22a. (CL = CL1 + CL2). Thereby, in this embodiment, the segment coil 22a can be easily and smoothly inserted between the pair of protrusions 30 and 30.

  Furthermore, by mounting the rotating electrical machine 10 including the stator structure according to the present embodiment on a vehicle (not shown), the manufacturing process can be simplified and the manufacturing cost can be reduced.

DESCRIPTION OF SYMBOLS 10 Rotating electrical machine 20 Stator core 22a Segment coil 28 Open slot 30 Protruding part 32 Insulating paper (insulating sheet)
W1 Circumferential width of the outer peripheral region W2 Circumferential width of the inner peripheral region W3 Peripheral width of the segment coil W4 Peripheral width of the open slot P Protrusion amount T Thickness of the insulating paper in the circumferential direction FW Crease width

Claims (4)

A stator core having a plurality of slots, and winding a segment coil through the slots;
An insulating sheet interposed between the slot and the segment coil;
With
The slot is formed of an open slot that is wider than at least the circumferential width of the segment coil,
By varying the circumferential width of the outer peripheral area of the stator core in the slot and the circumferential width of the inner peripheral area, a protrusion is formed on the inner peripheral portion of the slot,
The protruding amount of the protruding portion is substantially the same as the thickness in the circumferential direction of the insulating sheet. The stator structure according to claim 1,
The insulating sheet has two folds formed along the axial direction of the stator core;
The stator structure, wherein a crease width between the two creases is set to be not less than a circumferential width of the segment coil and not more than a circumferential width of the slot.   A rotating electrical machine comprising the stator structure according to claim 1.   A vehicle comprising the stator structure according to claim 1.

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