阅读说明：本技术 定子和电动机 (Stator and motor ) 是由 三井秀年 于 2020-03-13 设计创作，主要内容包括：本发明涉及一种定子和电动机,能够防止绝缘纸变形而错位或卷入。定子具备：定子芯、插入多个槽的第1线圈和第2线圈、以及配置于第1线圈与第2线圈之间的绝缘纸。第1线圈具有收容于第1槽的第1部分,第2线圈具有收容于第1槽的第2部分。绝缘纸具备：分别从定子芯的端面突出的片状绝缘部,和多个腿部。片状绝缘部分别配置于第1线圈从第1部分向端面各自的外方延伸的第1线圈端与第2线圈从第2部分向端面各自的外方延伸的第2线圈端之间,多个腿部具有插入第1槽且配置于第1部分与第2部分之间的第1腿部。(The invention relates to a stator and a motor, which can prevent the dislocation or the rolling of insulation paper caused by deformation. The stator is provided with: the stator includes a stator core, a1 st coil and a2 nd coil inserted into a plurality of slots, and insulating paper disposed between the 1 st coil and the 2 nd coil. The 1 st coil has a1 st portion received in the 1 st slot, and the 2 nd coil has a2 nd portion received in the 1 st slot. The insulating paper is provided with: a sheet-like insulating portion protruding from an end surface of the stator core, respectively, and a plurality of leg portions. The sheet-like insulating portions are respectively disposed between a1 st coil end of the 1 st coil extending outward from the 1 st portion to the end surfaces and a2 nd coil end of the 2 nd coil extending outward from the 2 nd portion to the end surfaces, and the plurality of leg portions have a1 st leg portion inserted into the 1 st slot and disposed between the 1 st portion and the 2 nd portion.)

1. A stator, characterized in that,

the stator includes:

a stator core having a plurality of slots;

1 st and 2 nd coils inserted into the plurality of slots in a distributed winding manner; and

an insulating paper disposed between the 1 st coil and the 2 nd coil,

the 1 st coil has a1 st portion received in the 1 st slot,

the 2 nd coil has a2 nd portion received in the 1 st slot,

the insulating paper is provided with: a pair of sheet-like insulating portions protruding from a pair of end surfaces of the stator core in an axial direction, respectively, and a plurality of leg portions connecting the pair of sheet-like insulating portions to each other,

the pair of sheet-like insulating portions are respectively disposed between a1 st coil end of the 1 st coil extending outward from the 1 st portion toward each of the pair of end surfaces and a2 nd coil end of the 2 nd coil extending outward from the 2 nd portion toward each of the pair of end surfaces,

the plurality of legs have a1 st leg inserted into the 1 st slot and disposed between the 1 st and 2 nd portions.

2. The stator according to claim 1,

each of the pair of sheet-like insulating portions has:

a main portion connected to the 1 st leg and interposed between the 1 st coil end and the 2 nd coil end; and

and a sub-portion extending from the main portion, separated from the 1 st coil end, and disposed radially outward of the stator core with respect to the 2 nd coil end.

3. The stator according to claim 2,

the 2 nd coil has a 3 rd portion, the 3 rd portion is accommodated in a2 nd slot which does not accommodate the 1 st coil,

the plurality of legs have a2 nd leg disposed between the 2 nd slot inner surface and the 3 rd portion.

4. The stator according to claim 3,

the plurality of legs have: one of the 2 nd leg portions connected to the primary portion and another of the 2 nd leg portions connected to the secondary portion.

5. The stator according to any one of claims 1 to 4,

the insulating paper has a protrusion portion provided to protrude from each of the pair of sheet-like insulating portions in the same direction as the 1 st leg portion, and the protrusion portion covers a root portion of the 1 st coil end connected to the 1 st portion outside each of the pair of end faces.

6. The stator according to any one of claims 1 to 5,

each of the plurality of leg portions has a shape that holds its own position by an elastic restoring force in a state of being deformed by being in contact with an inner surface of the groove.

7. An electric motor, characterized in that,

the motor includes the stator according to any one of claims 1 to 6.

Technical Field

The invention relates to a stator and a motor.

Background

In general, in a motor, for example, a three-phase ac motor, insulating paper is used to ensure insulation between coils of different phases. Japanese patent laid-open publication No. 2018-098995 discloses: "a motor having an interphase insulating paper mounted thereon, the interphase insulating paper having: a planar insulating portion disposed to protrude from each end surface of the stator core; a1 st leg and a2 nd leg which are inserted into the grooves by integrally connecting the planar insulating portions on the respective end surface sides to each other; an insulating projection projecting radially inward of the stator core from the planar insulating portion on each end surface side; and a 3 rd leg portion which is integrally connected to the insulating convex portions on the respective end surface sides and is inserted into the groove ".

Japanese laid-open patent publication No. 2015-116086 describes: "a 1 st interphase insulating sheet, this 1 st interphase insulating sheet has: a pair of 1 st interphase insulating portions in the shape of annular sheets; and a plurality of bridge portions having a predetermined bridge width connecting the pair of 1 st interphase insulating portions ". Japanese patent laid-open No. 2008-172878 describes: "a motor having an interlayer insulating portion, the interlayer insulating portion having a leg portion connecting a1 st insulating portion for insulating a coil end and a2 nd insulating portion for insulating a coil end opposite to the 1 st insulating portion, both circumferential end portions of the 1 st insulating portion and the 2 nd insulating portion being attached so as to overlap each other, the leg portion of the interlayer insulating portion being inserted into a groove located at both boundary end portions of a winding wire of a next layer inserted inside each layer".

Disclosure of Invention

Problems to be solved by the invention

For example, in the manufacture of a three-phase ac motor, when a three-phase coil is divided into slots to be inserted into a stator core a plurality of times, the following is performed: after a coil of a certain phase is inserted into a slot of a stator core of a motor, an insulating paper is inserted adjacent to a coil end of the coil, and then a coil of a different phase is inserted into the slot adjacent to the opposite side of the insulating paper. In this case, the coil inserted later may displace the insulating paper inserted earlier.

Means for solving the problems

The stator according to an aspect of the present disclosure includes: a stator core having a plurality of slots; 1 st and 2 nd coils inserted into the plurality of slots in a distributed winding manner; and an insulating paper disposed between the 1 st coil and the 2 nd coil, wherein the 1 st coil has a1 st portion housed in a1 st slot, and the 2 nd coil has a2 nd portion housed in the 1 st slot, the insulating paper comprising: the stator includes a pair of sheet-like insulating portions that protrude from a pair of end surfaces of the stator core in an axial direction, and a plurality of leg portions that connect the pair of sheet-like insulating portions to each other, the pair of sheet-like insulating portions being disposed between a1 st coil end of the 1 st coil extending outward from the 1 st portion toward each of the pair of end surfaces and a2 nd coil end of the 2 nd coil extending outward from the 2 nd portion toward each of the pair of end surfaces, respectively, the plurality of leg portions having a1 st leg portion that is inserted into the 1 st slot and disposed between the 1 st portion and the 2 nd portion.

In the stator, each of the pair of sheet-like insulating portions may include: a main portion connected to the 1 st leg and interposed between the 1 st coil end and the 2 nd coil end; and a sub portion extending from the main portion, separated from the 1 st coil end, and disposed on a radially outer side of the stator core with respect to the 2 nd coil end.

In the stator, the 2 nd coil may have a 3 rd portion, the 3 rd portion may be accommodated in a2 nd slot in which the 1 st coil is not accommodated, and the plurality of leg portions may have a2 nd leg portion disposed between an inner surface of the 2 nd slot and the 3 rd portion.

In the stator, the plurality of leg portions may include: one of the 2 nd leg portions connected to the primary portion and another of the 2 nd leg portions connected to the secondary portion.

In the stator, the insulating paper may have a protrusion portion provided to protrude from each of the pair of sheet-like insulating portions in the same direction as the 1 st leg portion, and the protrusion portion may cover a root portion of the 1 st coil end connected to the 1 st portion outside each of the pair of end surfaces.

In the stator, each of the plurality of leg portions may have a shape that holds its own position by an elastic restoring force in a state of being deformed by being in contact with an inner surface of the slot.

A motor according to another aspect of the present disclosure includes the stator.

ADVANTAGEOUS EFFECTS OF INVENTION

The invention can prevent the dislocation or the rolling of the insulation paper caused by the deformation.

Drawings

The objects, features and advantages of the present invention will become more apparent from the following description of the embodiments in connection with the accompanying drawings. In the context of the present drawing, it is,

FIG. 1 is a perspective view showing a stator of a motor according to an embodiment,

FIG. 2 is a perspective view showing a stator of a motor according to an embodiment,

FIG. 3 is a perspective view of an insulating paper disposed between the 1 st coil and the 2 nd coil,

fig. 4 is a plan view of a portion at an end face of the stator core where the 1 st coil is arranged,

FIG. 5 is a sectional view in the case of cutting one groove along a plane perpendicular to the axial direction,

FIG. 6 is a view showing a state in which a tensile force is applied to the insulating paper of the embodiment in a direction in which a pair of sheet-like insulating portions are separated from each other,

FIG. 7 is a view showing a state in which a tensile force is applied to the insulating paper of the comparative example in a direction in which a pair of sheet-like insulating portions are separated,

figures 8A, 8B and 8C are developed views of slots of a stator core,

FIG. 9 is a perspective view of an insulating paper disposed between the 2 nd coil and the 3 rd coil,

FIG. 10 is a view showing a state where the 1 st coil and the insulating paper are mounted on the stator core,

FIG. 11 is a view showing a state of mounting the 1 st coil, the 2 nd coil and the insulation paper to the stator core,

FIG. 12 is a perspective view showing a modified example of the insulating paper,

FIG. 13 is a view showing a state where the insulating paper of FIG. 12 is inserted between the 1 st coil and the 2 nd coil,

fig. 14 is an enlarged view of the vicinity of the protruding portion in a state where the insulating paper of fig. 12 is attached between the 1 st coil and the 2 nd coil.

Detailed Description

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In all the drawings, corresponding constituent elements are given common reference numerals. For ease of understanding, the drawings are appropriately modified in scale. The embodiment shown in the drawings is an example for carrying out the present invention, and the present invention is not limited to the illustrated embodiment.

Fig. 1 and 2 are perspective views showing a stator 10 of a motor 90 according to an embodiment. As shown in fig. 1 and 2, the stator 10 includes: a stator core 1 having a plurality of slots 31; a plurality of coils 51 including a1 st coil 51a and a2 nd coil 51b inserted into the plurality of slots 31 in a distributed winding manner; and an insulating paper 20. For example, the motor 90 is a three-phase ac motor, and coils 51 of three phases (U-phase, V-phase, and W-phase) are inserted into the slots 31 in a distributed winding manner. The U-phase coil is referred to as a1 st coil 51a, the V-phase coil is referred to as a2 nd coil 51B, and the W-phase coil is referred to as a 3 rd coil 51C (see fig. 8A, 8B, and 8C). The insulating paper 20 includes: an insulating paper 20a disposed between the 1 st coil 51a and the 2 nd coil 51b, and an insulating paper 20b disposed between the 2 nd coil 51b and the 3 rd coil 51 c. Stator core 1 is formed by laminating electromagnetic steel sheets. The stator 10 is combined with a rotor, a bearing, a bracket, a housing, and the like, which are not shown, to constitute the motor 90.

For convenience of explanation, 4U-phase 1-th coils 51a and one insulating paper 20a are shown in fig. 1, and 4U-phase 1-th coils 51a, one insulating paper 20a, and one V-phase 2-th coil 51b are shown in fig. 2. Actually, in the stator core 1, 4 1 st coils 51a are arranged at 90-degree intervals in the circumferential direction of the stator core 1 (hereinafter simply referred to as the circumferential direction), 4 2 nd coils 51b are arranged at 90-degree intervals in the circumferential direction, and 4 3 rd coils 51c are arranged at 90-degree intervals in the circumferential direction. Further, 4 pieces of insulating paper 20a are disposed between the 4 1 st coils 51a and the 4 2 nd coils 51b, respectively, and 4 pieces of insulating paper 20b are disposed between the 4 2 nd coils 51b and the 4 3 rd coils 51c, respectively. Fig. 1 and 2 show a configuration example in which 36 slots 31 are formed along the circumferential direction on the cylindrical inner peripheral surface of the stator core 1 and the coil 51 is inserted into the slots 31 so as to be wound in a 3-phase distributed manner, but the present invention is not limited to such a configuration example.

The 1 st coil 51a has the 1 st segment 51a1, and the 1 st segment 51a1 is accommodated in the 1 st slot 31a, which is a slot into which both the 1 st coil 51a and the 2 nd coil 51b are inserted. The 2 nd coil 51b has the 2 nd portion 51b1 received in the 1 st slot 31 a. The insulating paper 20a includes: a pair of sheet-like insulating portions 201 and 202 projecting from a pair of end surfaces 1a and 1b of the stator core 1 in the axial direction, respectively, and a plurality of leg portions 211 to 215 (see fig. 3) connecting the pair of sheet-like insulating portions 201 and 202 to each other. The pair of sheet-like insulating portions 201 and 202 are respectively disposed between the 1 st coil end 51a2 extending outward from the 1 st portion 51a1 toward each of the pair of end surfaces 1a and 1b and the 2 nd coil end 51b2 extending outward from the 2 nd portion 51b1 toward each of the pair of end surfaces 1a and 1 b. The plurality of legs 211 to 215 have a1 st leg 211 inserted into the 1 st groove 31a and disposed between the 1 st part 51a1 and the 2 nd part 51b 1.

In assembling the stator 10, first, the 1 st coil 51a is inserted into the slot 31, and thereby the insulating paper 20a is attached to a portion of the coil end of the 1 st coil 51a protruding from the end surfaces 1a, 1b of the stator core 1 in the axial direction (the direction of the central axis AX) which is located inside the stator core 1 in the radial direction (the radial direction centering on the position of the central axis AX). Next, the 2 nd coil 51b is inserted into the slot 31, and thereby the insulating paper 20b is attached to a portion of the coil end of the 2 nd coil 51b protruding from the end surfaces 1a and 1b of the stator core 1 in the axial direction, which is located on the inner side in the radial direction of the stator core 1. Next, the 3 rd coil 51c is inserted into the slot 31. For example, the coil 51 can be attached to the slot 31 as follows: the coils of the portions to be simultaneously inserted are attached to an insertion plate of the insertion device, and the coils are inserted from the end surface 1a side toward the end surface 1b side.

As shown in fig. 1, the 1 st coil 51a includes a large coil 551 of 5 slot pitches and a small coil 552 of 3 slot pitches arranged inside the large coil 551 in the circumferential direction. The large coil 551 is configured to wind a winding member corresponding to one slot, and the small coil 552 is configured to wind a winding member corresponding to half a slot (see fig. 8A, 8B, and 8C described later). That is, the 1 st coil 51a is configured to wind a winding member by an amount corresponding to 1.5 slots. Similarly, the 2 nd coil 51B includes a large coil 561 having a slot pitch of 5 and a small coil 562 arranged circumferentially inside the large coil 561 (see fig. 8A, 8B, and 8C described later). The large coil 561 is configured to wind a winding member corresponding to one slot, and the small coil 562 is configured to wind a winding member corresponding to a half slot (see fig. 8A, 8B, and 8C described later). That is, the 2 nd coil 51b is configured to wind the winding member by an amount corresponding to 1.5 slots. The 3 rd coil 51c also has the same configuration as the 1 st coil 51a and the 2 nd coil 51 b.

Fig. 2 shows a state in which 12 nd coil 51b is mounted on the radial inner side of the stator core 1 with the insulating paper 20a interposed therebetween with respect to the 1 st coil 51 a. As shown in fig. 1 and 2, the 1 st coil 51a and the 2 nd coil 51b are arranged so as to overlap each other in the range of 3 slots from the right end out of 6 slots in the range of the width of the 1 st coil 51a in the circumferential direction of the stator core 1.

The insulating paper 20 is made of a material (for example, a plastic material) having excellent electrical insulation properties. The insulating paper 20 can be made by: a blank is cut out from 1 sheet (film) in a punching step, and the obtained blank is subjected to a bending process in a pressing step. Fig. 3 is a perspective view of the insulating paper 20 a. For convenience of explanation, in fig. 3, the direction corresponding to the axial direction is defined as the vertical direction, and the horizontal direction is defined as shown in the drawing. As shown in fig. 3, the insulating paper 20a includes a sheet-like insulating portion 201 disposed to protrude from one end surface 1a (see fig. 1) of the stator core 1 and a sheet-like insulating portion 202 disposed to protrude from the other end surface 1b (see fig. 1) of the stator core 1. The insulating paper 20a further includes a plurality of leg portions 211 to 215, and the plurality of leg portions 211 to 215 extend in the axial direction of the stator core 1 so as to connect the sheet-like insulating portion 201 and the sheet-like insulating portion 202.

The sheet-like insulating portion 201 includes: a convex main portion 201c connected to the 1 st leg 211 and interposed between the 1 st coil end 51a2 and the 2 nd coil end 51b2, and sub portions 201a, 201b extending from the main portion 201 c. The sub-portion 201b is separated from the 1 st coil end 51a2 and is disposed radially outward of the stator core 1 with respect to the 2 nd coil end 51b 2. The main portion 201c covers a radially inner portion of the coil end of the 1 st coil 51a protruding from the end surface 1a of the stator core 1. Similarly, the sheet-like insulating portion 202 has: a convex main portion 202c connected to the 1 st leg portion 211 and interposed between the 1 st coil end 51a2 and the 2 nd coil end 51b2, and sub portions 202a, 202b extending from the main portion 202 c. The sub-portion 202b is separated from the 1 st coil end 51a2 and is disposed radially outward of the stator core 1 with respect to the 2 nd coil end 51b 2. The main portion 202c covers a radially inner portion of the coil end of the 1 st coil 51a protruding from the end surface 1b of the stator core 1.

The main portion 201c and the main portion 202c are joined by two legs 211, 212. As shown in fig. 2, the two legs 211, 212 are disposed in the main portions 201c, 202c in a range where the 1 st coil 51a and the 2 nd coil 51b overlap. Specifically, the 2 nd leg portion 212 is accommodated in a groove 31b (hereinafter, also referred to as a2 nd groove 31b) which does not accommodate the 1 st coil 51a and accommodates the 2 nd coil 51 b. The 2 nd leg portion 212 is disposed between the inner surface of the 2 nd slot 31b and the 2 nd coil 51 b. The 1 st leg 211 is accommodated in the 1 st groove 31a as described above. In addition, the leg portion 215 is also housed in the slot 31 which does not house the 1 st coil 51a but houses the 2 nd coil 51b, similarly to the 2 nd leg portion 212. By providing a plurality of leg portions in the main portion 201c (202c) of the insulating paper 20a in a range where the 1 st coil 51a and the 2 nd coil 51b overlap, when the 2 nd coil 51b is inserted into the slot 31 from above and mounted in the state shown in fig. 1, it is possible to prevent the insulating paper 20a from being deformed, displaced, or entangled, particularly, the lower sheet-like insulating portion 202 of the insulating paper 20a being pulled by the 2 nd coil 51 b. In the present embodiment, the 1 st leg portion 211 is disposed at the position of the 1 st groove 31a of the sheet-like insulating portions 201 and 202 where it is considered that a strong pulling force is likely to act when the 2 nd coil 51b is inserted from above, and therefore, it is possible to more reliably prevent the insulating paper 20a from being deformed and displaced or entangled. Further, disposing the 1 st leg 211 in the 1 st slot 31a into which both the 1 st coil 51a and the 2 nd coil 51b are inserted also contributes to improving the insulation between the 1 st coil 51a and the 2 nd coil 51 b.

Fig. 4 is a view of a portion of the stator core 1 on the end surface 1a side where the 1 st coil 51a is arranged, as viewed from above. As shown in fig. 4, the width a of the main portion 201c (202c) of the insulating paper 20a in the circumferential direction is larger than the width B of the coil end of the 1 st coil 51 a. Returning to fig. 3, the left end of the main portion 201c and the right end of the sub portion 201a are connected by a connection surface 201 f. The right end of the main portion 201c and the left end of the sub portion 201b are connected by a connecting surface 201 g. The left end of the main portion 202c and the right end of the sub portion 202a are coupled by a coupling surface 202 f. The right end of the main portion 202c and the left end of the sub portion 202b are connected by a connecting surface 202 g.

The sharp upper end of the bent portion at the boundary between the main portion 201c and the coupling surface 201f is removed, thereby forming a notch 205. Similarly, the sharp upper end of the bent portion at the boundary between the main portion 201c and the coupling surface 201g is removed, thereby forming a notch 206. By providing the notches 205 and 206 in the sheet-like insulating portion 201 in this manner, when the 2 nd coil 51b is inserted from above in fig. 1 into the downward groove 31, it is possible to avoid the situation in which the 2 nd coil 51b catches on the sharp upper end of the bent portion and the insulating paper 20a is wound.

Each of the plurality of leg portions 211 to 215 has a shape that holds its own position by an elastic restoring force in a state of being deformed by being in contact with an inner surface of the groove 31. For example, as shown by the portion surrounded by a circle on the right side in fig. 3, when the leg portions 211 to 215 are viewed in the vertical direction, the cross-sectional shape is formed in a shape of japanese kana "ハ". Since the leg portions 211 to 215 have the same structure, the 1 st leg portion 211 will be representatively described below. The 1 st leg 211 has a main leg surface 211a substantially parallel to the main portion 201c, and a left side surface 211b and a right side surface 211c obliquely protruding from both left and right side edges of the main leg surface 211a toward the radial inner side of the stator core 1. The distance between the left side surface 211b and the right side surface 211c increases from the main leg surface 211a toward the center axis AX side.

As shown in fig. 3, in each of the leg portions 211 to 215, the portion composed of the main leg surface 211a, the left side surface 211b, and the right side surface 211c is formed except for the connection portions between the leg portions 211 to 215 and the sheet-shaped insulating portion 201 and the connection portions between the leg portions 211 to 215 and the sheet-shaped insulating portion 202.

Fig. 5 is a sectional view of the stator core 1 with one slot cut along a plane perpendicular to the central axis AX, and is a view for explaining the relationship between the 1 st leg 211 and the width of the slot 31. The width of the main leg surface 211a of the 1 st leg 211, i.e., the width C along the circumferential direction of the stator core 1, is a dimension (D ≧ C) that can pass through the width D of the opening portion 32 of the slot 31 at the radially inner end of the stator core 1. Therefore, by bending the left side surface 211b and the right side surface 211c by at least 90 ° with respect to the main leg surface 211a, the 1 st leg 211 can be inserted through the opening 32 of the slot 31 and the 1 st leg 211 can be pushed into the slot 31.

When the left side surface 211b and the right side surface 211c of the 1 st leg 211 pass through the opening 32 of the groove 31, the elastic restoring force acts to restore the shape in which the distance between them is increased as it is separated from the main leg surface 211 a. The total width (maximum width) E between the left side surface 211b and the right side surface 211c in the natural state of the 1 st leg portion 211 is a dimension (E > F) larger than the width F of the inner space of the slot 31 in the circumferential direction of the stator core 1, that is, the interval of the inner surfaces of the slot 31 in the circumferential direction. The slots 31 have a constant width F along the radial direction of the stator core 1, except for the width D of the opening 32. With the above configuration, the 1 st leg portion 211 is held in its position by the elastic restoring force in a state of being deformed by being in contact with the inner surface of the groove 31.

Next, a method of mounting the insulating paper 20a will be described. As shown in fig. 1, the 1 st coil 51a is disposed so that the 1 st coil 51a is inserted into the predetermined slot 31 of the stator core 1. Thereby, the coil end 56 of the 1 st coil 51a is formed so as to protrude from the end surfaces 1a, 1b of the stator core 1. Next, the insulating paper 20a is attached to the stator core 1 from the radially inner side. In detail, the mounting is performed as follows. The insulating paper 20a is attached to the stator core 1 such that the sheet-like insulating portion 201 covers the coil end 56 on the end surface 1a side from the radially inner side of the stator core 1, and the sheet-like insulating portion 202 covers the coil end 56 on the end surface 1b side from the radially inner side of the stator core 1. At this time, the 1 st leg 211 is inserted into the 1 st slot 31a, and the 2 nd leg 212 is inserted into the 2 nd slot 31 b. The leg portion 213 is inserted into the groove 31 located outside (left side in fig. 1) one end of the 1 st coil 51a in the circumferential direction. The leg portions 214 and 215 are respectively inserted into the two slots 31 located outside (right side in fig. 1) the other end of the 1 st coil 51a in the circumferential direction. At this time, the legs 211 to 215 are pushed in and inserted into the deep side of the groove 31.

Fig. 10 is a view showing a state where 4 1 st coils 51a are mounted on the stator core 1 and 4 insulating papers 20a are mounted on the inside thereof, as viewed from above. As shown in fig. 10, 4 pieces of insulating paper 20a are arranged so that end portions of adjacent sheet-like insulating portions 201 in the circumferential direction are bent and overlapped with each other at intervals of 90 degrees in the circumferential direction. Thus, the 4 1 st coils 51a are completely covered with the 4 insulating papers 20a on the radially inner side of the stator core 1. Further, on the radially inner side of the 4 pieces of insulating paper 20a, a space for mounting the 2 nd coil 51b and the like is secured.

Fig. 6 shows a state in which a tensile force is applied to the insulating paper 20a in a direction in which the main portion 201c and the main portion 202c are separated from each other. Fig. 7 shows a state in which a tensile force is applied to the insulating paper 400 having only 1 leg portion in the center of the main portion in a direction in which the main portion 401c and the main portion 402c are separated from each other, as a comparative example. In fig. 6 and 7, the sheet-like insulating portions 201 and 202 and the sheet-like insulating portions 401 and 402 apply the same degree of force to a position where a strong pulling force is supposed to act when the 2 nd coil 51b is inserted into the stator core 1. Comparing fig. 6 and 7, it can be seen that the deformation of the double-headed arrow X0 portion of fig. 6 is smaller than the deformation of the double-headed arrow X1 portion of fig. 7. Therefore, the displacement of the interval between the sheet-like insulating portions 201 and 202 of the insulating paper 20a when the 2 nd coil 51b is inserted is smaller than the displacement of the interval between the sheet-like insulating portions 401 and 402 of the insulating paper 400 of the comparative example. As a result, the insulating paper 20a of the present embodiment can more reliably prevent the insulating paper inserted first from being deformed or displaced by being pulled by the winding wire inserted later.

Fig. 8A, 8B, and 8C show developed views in which 36 slots 31 arranged in the circumferential direction on the inner circumferential surface of the stator core 1 are developed linearly. Fig. 8A, 8B, and 8C show cross sections obtained by cutting 36 grooves along a plane perpendicular to the axial direction. These developed views show the filled state of the coil in each slot 31 and the state of the arrangement of the insulating paper. In fig. 8A, 8B, and 8C, the coils of the respective phases are denoted by reference numerals such as "+ U", "+ V", "+ W", "— W". Here, "+", "-" indicate the direction of the current in the direction perpendicular to the paper of fig. 8A, 8B, and 8C. Fig. 8A shows a state in which the 1 st coil 51a and the insulating paper 20a are disposed in 36 slots 31. Fig. 8B shows a state in which the 2 nd coil 51B and the insulating paper 20B are further arranged from the state of fig. 8A. Fig. 8C shows a state in which the 3 rd coil 51C is further arranged from the state of fig. 8B. In fig. 8A, 8B, and 8C, the slot at the left end in the figure is designated as slot number 1, and the slot numbers are assigned so as to increase from the left side toward the right side in the figure.

In fig. 8A, of the 4 1 st coils 51a, one 1 st coil 51a is representatively denoted by a reference numeral. In fig. 8A, 4 pieces of insulating paper 20a are indicated by solid lines, and one piece of insulating paper 20a is representatively indicated by a thick solid line and denoted by a reference numeral. In fig. 8A, circular marks 6 (only a part of which is denoted by a reference numeral) indicate positions of the leg portions 211 to 215 of the insulating paper 20 a. In the state shown in fig. 8A in which the insulating paper 20a is attached, the leg portion of the insulating paper 20a can be disposed in an empty slot or a slot with a half slot empty. Referring to fig. 8A, 4 coils 51a are arranged at 90-degree intervals with respect to 36 slots 31 and 5 slot pitches. The 1 st coil 51a is configured to wind a winding member by an amount corresponding to 1.5 slots. In the insulating paper 20a labeled with reference numeral in fig. 8A, the leg portions 212 and 211 are inserted into the 13 th and 14 th slots S13 and S14, respectively, the leg portion 213 is inserted into the 9 th slot S9, and the leg portions 214 and 215 are inserted into the 16 th and 17 th slots S16 and S17, respectively.

In fig. 8B, among the 4 2 nd coils 51B, one 2 nd coil 51B is representatively denoted by a reference numeral. In fig. 8B, 4 pieces of insulating paper 20B are indicated by solid lines, and one piece of insulating paper 20B is representatively indicated by a thick solid line and denoted by a reference numeral. In fig. 8B, circular marks 6 (only a part of which is denoted by a reference numeral) indicate positions of the leg portions of the insulating paper 20B. In a state where the insulating paper 20a and the insulating paper 20b are attached, the leg portion of the insulating paper 20b can be disposed in an empty slot or a slot with a half slot empty. As shown in fig. 8B, the 2 nd coil 51B has the 3 rd portion 51B3, and the 3 rd portion 51B3 is accommodated in a groove (the 2 nd groove) that does not accommodate the 1 st coil 51 a. Referring to fig. 8B, 4 coils 51B are arranged at 90-degree intervals with respect to 36 slots 31 and 5 slot pitches. The 2 nd coil 51b is configured to wind a winding member by an amount corresponding to 1.5 slots.

As shown in fig. 8C, the 3 rd coil 51C and the 2 nd coil 51b are arranged so as to overlap each other. In fig. 8C, one 3 rd coil 51C is representatively denoted by a reference numeral. The 3 rd coil 51c is configured to wind a winding member by an amount corresponding to 1.5 slots. Since the 1 st to 3 rd coils 51a to 51c are each configured to wind a winding member by an amount corresponding to 1.5 slots, the 36 slots are filled with all of the 1 st to 3 rd coils 51a to 51c by being mounted in the slots 31.

The 2 nd coil 51b has a 4 th portion (denoted by reference numeral 68a in fig. 8C), and the 4 th portion is housed in a slot S17, which is a slot into which both the 2 nd coil 51b and the 3 rd coil 51C are inserted. The 3 rd coil 51c has the 5 th portion 69a housed in the slot S17.

The insulating paper 20b is attached between the 2 nd coil 51b and the 3 rd coil 51 c. Fig. 9 is a perspective view of the insulating paper 20 b. For convenience of explanation, in fig. 9, the direction corresponding to the axial direction is defined as the vertical direction, and the horizontal direction is defined as shown in the drawing. The insulating paper 20b includes: the stator core includes a pair of sheet-like insulating portions 501 and 502 protruding from a pair of end surfaces 1a and 1b of the stator core 1 in the axial direction, and a plurality of leg portions 511 to 514 connecting the pair of sheet-like insulating portions 501 and 502 to each other. The pair of sheet-like insulating portions 501 and 502 are respectively disposed between the coil end of the 2 nd coil 51b extending outward from the 4 th portion 68a toward the pair of end surfaces 1a and 1b and the coil end of the 3 rd coil 51c extending outward from the 5 th portion 69a toward the pair of end surfaces 1a and 1 b. The plurality of legs 511 to 514 have an insertion groove S17 and are disposed between the 4 th portion 68a and the 5 th portion 69a as the 1 st leg 511.

As shown in fig. 9, the sheet-like insulating portion 501 is disposed so as to protrude from one end surface 1a of the stator core 1. The sheet-like insulating portion 502 is disposed so as to protrude from the other end surface 1b of the stator core 1. The plurality of leg portions 511 to 514 extend in the axial direction of the stator core 1 so as to connect the sheet-like insulating portion 501 and the sheet-like insulating portion 502.

The sheet-like insulating portion 501 includes: a main portion 501c connected to the 1 st leg 511 and interposed between the coil end of the 2 nd coil 51b and the coil end of the 3 rd coil 51c, and sub portions 501a, 501b extending from the main portion 501 c. The sub portion 501b is separated from the coil end of the 2 nd coil 51b and is disposed radially outward of the stator core 1 with respect to the coil end of the 3 rd coil 51 c. The main portion 501c covers a radially inner portion of the coil end of the 2 nd coil 51b protruding from the end surface 1a of the stator core 1. Similarly, the sheet-like insulating portion 502 has: a main portion 502c connected to the 1 st leg 511 and interposed between the coil end of the 2 nd coil 51b and the coil end of the 3 rd coil 51c, and sub portions 502a, 502b extending from the main portion 501 c. The sub portion 502b is spaced apart from the coil end of the 2 nd coil 51b and is disposed radially outward of the stator core 1 with respect to the coil end of the 3 rd coil 51 c. The main portion 502c covers a radially inner portion of the coil end of the 2 nd coil 51b protruding from the end surface 1b of the stator core 1.

The main portion 501c and the main portion 502c are joined by two legs 511, 512. As shown in fig. 8A, 8B, and 8C, the two leg portions 511 and 512 are arranged in a range where the 2 nd coil 51B and the 3 rd coil 51C overlap on the main portions 501C and 502C. Specifically, the 2 nd leg portion 512 is housed in the slot S16 in which the 1 st coil 51a and the 2 nd coil 51b are not housed. The 1 st leg 511 is housed in a slot S17 in which the 2 nd coil 51b and the 3 rd coil 51c are housed. By providing a plurality of leg portions on the main portion 501c (502c) of the insulating paper 20b, when the 3 rd coil 51c is inserted into the slot 31 from above from the state where the 1 st coil 51a, the insulating paper 20a, the 2 nd coil 51b, and the insulating paper 20b are attached, it is possible to prevent the insulating paper 20b, particularly the lower sheet-like insulating portion 502, from being pulled by the 3 rd coil 51c and deforming and displacing or winding the insulating paper 20 b. In the present embodiment, the 1 st leg portion 511 is disposed at the position of the groove S17 of the sheet-like insulating portions 501 and 502 where it is considered that a strong pulling force is likely to act when the 3 rd coil 51c is inserted from above, and therefore, it is possible to more reliably prevent the insulating paper 20b from being deformed and displaced or entangled. Further, disposing the 1 st leg 511 in the slot S17 into which both the 2 nd coil 51b and the 3 rd coil 51c are inserted also contributes to improving the insulation between the 2 nd coil 51b and the 3 rd coil 51 c. The leg portions 511 to 514 of the insulating paper 20b are each shaped like a japanese kana "ハ" in a cross-sectional view along the axial direction, similarly to the leg portions 211 to 215 of the insulating paper 20 a.

Of the 4 leg portions 511 to 514 of the insulating paper 20b, two leg portions 511 to 512 located at the center are inserted into two slots 31 in a range where the 2 nd coil 51b and the 3 rd coil 51c overlap in a range of an amount corresponding to 6 slots in the circumferential direction of the 2 nd coil 51 b. Specifically, the leg portions 511 to 512 are attached to the 16 th and 17 th slots S16 and S17 into which the 3 rd coil 51c is inserted in the range of the 2 nd coil 51b corresponding to the 6 slots. The leg portion 513 is inserted into the No. 12 slot S12 located on the outer side (left side in fig. 8B) of the 2 nd coil 51B in the circumferential direction. The leg portion 514 is inserted into the No. 20 slot S20 located on the outer side (right side in fig. 8B) of the 2 nd coil 51B in the circumferential direction.

Fig. 11 shows a state in which 4 2 nd coils 51b are further mounted on the stator core 1 from the state of fig. 10, and 4 insulating papers 20b are mounted inside thereof. In the case of the insulating paper 20b, since the two leg portions 511 and 512 are formed in the overlapping range of the 2 nd coil 51b and the 3 rd coil 51c, the insulating paper 20b can be prevented from being deformed and displaced or entangled when the 3 rd coil 51c is inserted into the slot 31. As shown in fig. 11, 4 pieces of insulating paper 20b are arranged at intervals of 90 degrees in the circumferential direction, and are arranged such that the end portions of the adjacent sheet-like insulating portions 501 in the circumferential direction are bent and overlapped with each other. Thus, the 4 2 nd coils 51b are completely covered with the 4 insulating papers 20b on the radially inner side of the stator core 1. In addition, on the radially inner side of the 4 pieces of insulating paper 20b, a space for mounting the 3 rd coil 51c is secured.

As described above, according to the present embodiment, it is possible to prevent the insulating paper inserted first from being displaced by the winding wire inserted later.

While the embodiments of the present disclosure have been described above, it is intended that those skilled in the art recognize that various modifications and changes can be made without departing from the scope of the disclosure of the claims.

The structure of the insulating paper 20a shown in fig. 3 is an example, and various modifications can be made to the insulating paper 20 a. Fig. 12 is a perspective view of an insulating paper 20e in which projections 207 and 208 are added to the insulating paper 20a as a modification of the insulating paper 20 a. The insulating paper 20e has the same structure as the insulating paper 20a shown in fig. 3, except that the projections 207 and 208 are added. The insulating paper 20e has protrusions 207 and 208 provided to protrude from the pair of sheet-like insulating portions 201 and 202 in the same direction as the leg portions 211 and 212, respectively, and the protrusions 207 and 208 cover the base of the coil end of the 2 nd coil 51b outside the pair of end surfaces 1a and 1b, respectively. In detail, the protrusion 207 is formed at a position where no leg is formed in a range where the 1 st coil 51a and the 2 nd coil 51b overlap in a side 201e of the main portion 201c adjacent to the stator core 1. The protrusion 208 is formed at a position opposite to the protrusion 207 in the side 202e of the main portion 202c adjacent to the stator core 1. For example, the protrusions 207 and 208 may be formed at positions where the groove (the 15 th groove S15 in fig. 8A) of the 1 st coil 51a is inserted. The projections 207 and 208 may have a planar shape having a width of 1 slot width.

Fig. 13 shows a state in which the insulating paper 20e is inserted between the 1 st coil 51a and the 2 nd coil 51 b. The projections 207 and 208 are disposed at positions where the root of the coil end of the 1 st coil 51a inserted into the slot 31 first overlaps the root of the coil end of the 2 nd coil 51b inserted into the slot 31 later. With this structure, the projections 207 and 208 are interposed between the root of the coil end of the 1 st coil 51a and the root of the coil end of the 2 nd coil 51b, and the insulation between the 1 st coil 51a and the 2 nd coil 51b is more secured.

Fig. 14 is an enlarged view of the vicinity of the projection 207 in a state where the insulating paper 20e is attached between the 1 st coil 51a and the 2 nd coil 51 b. As can be understood from fig. 14, the projection 207 is interposed between the root of the coil end of the 1 st coil 51a and the root of the coil end of the 2 nd coil 51 b.

The insulating paper of the above embodiment has been described as a member used between coils of different phases of a three-phase alternating-current motor, but the insulating paper of the above embodiment can be used for insulating between coils of various types of motors in which a plurality of coils are arranged in a distributed winding manner in a groove of a stator core in an overlapping manner.