stator and motor

Abstract

The present invention relates to a stator and an electric motor that can prevent insulating paper from being deformed, displaced, or entangled. The stator comprises: a stator core, a first coil and a second coil inserted into a plurality of slots, and insulating paper arranged between the first coil and the second coil. The first coil has a first portion accommodated in the first slot, and the second coil has a second portion accommodated in the first slot. The insulating paper comprises: a sheet-like insulating portion protruding from the end face of the stator core, and a plurality of legs. The sheet-like insulating portion is respectively arranged between a first coil end extending from the first portion toward the outside of each end face of the first coil and a second coil end extending from the second portion toward the outside of each end face of the second coil, and the plurality of legs have a first leg inserted into the first slot and arranged between the first portion and the second portion.

Description

Technical Field

[0001] The present invention relates to a stator and a motor. Background Art

[0002] Insulating paper is commonly used in electric motors, such as three-phase AC motors, to ensure insulation between coils of different phases. Japanese Patent Application Laid-Open No. 2018-098995 describes a motor equipped with interphase insulating paper. The interphase insulating paper comprises: a planar insulating portion projecting from each end face of a stator core; a first leg and a second leg integrally connecting the planar insulating portions on each end face and inserted into a slot; an insulating protrusion projecting radially inward from the planar insulating portion on each end face; and a third leg integrally connecting the insulating protrusions on each end face and inserted into the slot.

[0003] Japanese Patent Application Laid-Open No. 2015-116086 describes a first interphase insulating sheet having a pair of annular first interphase insulating portions and a plurality of bridge portions having a predetermined bridge width connecting the pair of first interphase insulating portions. Japanese Patent Application Laid-Open No. 2008-172878 describes an electric motor having an interlayer insulating portion, the interlayer insulating portion having legs connecting a first insulating portion that insulates a coil end and a second insulating portion that insulates a coil end opposite the first insulating portion, the first and second insulating portions being mounted so that their circumferential ends overlap, and the legs of the interlayer insulating portion being inserted into slots located at both ends of a boundary between windings of a next layer inserted inside each layer. Summary of the Invention

[0004] Problems to be solved by the invention

[0005] For example, in the manufacture of three-phase AC motors, when the three-phase coils are inserted into the slots of the stator core in multiple stages, the following procedure is used: After the coil of a certain phase is inserted into the slot of the motor's stator core, insulating paper is inserted adjacent to the coil end of that coil. Subsequently, the coil of a different phase is inserted into the slot adjacent to the opposite side of the insulating paper. In this case, the later-inserted coil may cause the insulating paper inserted earlier to shift position.

[0006] Solutions for solving problems

[0007] A stator according to one technical solution of the present disclosure includes: a stator core having a plurality of slots; a first coil and a second coil inserted into the plurality of slots in a distributed winding manner; and insulating paper arranged between the first coil and the second coil, the first coil having a first portion accommodated in the first slot, and the second coil having a second portion accommodated in the first slot. The insulating paper includes: a pair of sheet-shaped insulating portions protruding from a pair of end faces of the stator core in an axial direction, and a plurality of legs connecting the pair of sheet-shaped insulating portions. The pair of sheet-shaped insulating portions are respectively arranged between a first coil end of the first coil extending outward from the first portion toward the pair of end faces, and a second coil end of the second coil extending outward from the second portion toward the pair of end faces. The plurality of legs include a first leg inserted into the first slot and arranged between the first and second portions.

[0008] For the above-mentioned stator, it can also be that the pair of sheet-shaped insulating parts each have: a main part, which is connected to the first leg and is between the first coil end and the second coil end; and an auxiliary part, which is an auxiliary part extending from the main part, separated from the first coil end, and arranged at a position radially outside the stator core relative to the second coil end.

[0009] In the stator, the second coil may include a third portion received in a second slot not receiving the first coil, and the plurality of legs may include a second leg disposed between an inner surface of the second slot and the third portion.

[0010] In the above-described stator, the plurality of leg portions may include one second leg portion connected to the main portion, and another second leg portion connected to the auxiliary portion.

[0011] For the above-mentioned stator, the insulating paper may also have a protrusion, which is a protrusion protruding from the pair of sheet-shaped insulating parts in the same direction as the first leg part, and the protrusion covers the root of the first coil end connected to the first part on the outer side of each of the pair of end faces.

[0012] In the above-described stator, each of the plurality of leg portions may have a shape that maintains its position by elastic restoring force in a state where the leg portions are deformed by contact with an inner surface of the slot.

[0013] An electric motor according to another aspect of the present disclosure includes the above-mentioned stator.

[0014] Effects of the Invention

[0015] The present invention can prevent the insulating paper from being deformed, dislocated or rolled in. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The purpose, features and advantages of the present invention will become more apparent from the following description of the embodiments in conjunction with the accompanying drawings.

[0017] Figure 1 1 is a perspective view showing a stator of an electric motor according to an embodiment.

[0018] Figure 2 1 is a perspective view showing a stator of an electric motor according to an embodiment of the present invention.

[0019] Figure 3 This is a three-dimensional diagram of the insulating paper disposed between the first coil and the second coil.

[0020] Figure 4 is a top view of the portion of the end face of the stator core where the first coil is arranged.

[0021] Figure 5 It is a cross-sectional view of a groove cut along a plane perpendicular to the axial direction.

[0022] Figure 6 1 is a diagram 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-shaped insulating portions are separated from each other.

[0023] Figure 7 : is a diagram 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-shaped insulating portions are separated from each other.

[0024] Figure 8A 、 Figure 8B and Figure 8C This is the expanded view of the stator core slots.

[0025] Figure 9 This is a three-dimensional diagram of the insulating paper placed between the second and third coils.

[0026] Figure 10 This is a diagram showing the state in which the first coil and insulating paper are mounted on the stator core.

[0027] Figure 11 This is a diagram showing the state in which the first coil, the second coil, and the insulating paper are installed on the stator core.

[0028] Figure 12 is a perspective view showing a modified example of insulating paper.

[0029] Figure 13 It means that a coil is inserted between the first coil and the second coil. Figure 12 Diagram of the state of the insulating paper,

[0030] Figure 14There is a Figure 12 An enlarged view of the protrusion and the vicinity of the insulating paper in the state of FIG. DETAILED DESCRIPTION

[0031] The following describes embodiments of the present disclosure with reference to the accompanying drawings. In all drawings, corresponding components are given common reference numerals. For ease of understanding, the scales of these drawings have been appropriately altered. Furthermore, the embodiments shown in the drawings are merely examples for implementing the present invention, and the present invention is not limited to the embodiments shown in the drawings.

[0032] Figure 1 and Figure 2 1 is a perspective view showing a stator 10 of an electric motor 90 according to an embodiment. Figure 1 and Figure 2 As shown, the stator 10 includes: a stator core 1 having a plurality of slots 31; a plurality of coils 51 including a first coil 51a and a second coil 51b inserted into the plurality of slots 31 in a distributed winding manner; and insulating paper 20. As an example, the motor 90 is a three-phase AC motor, and the coils 51 of the three phases (U phase, V phase, W phase) are inserted into the slots 31 in a distributed winding manner. The coil of the U phase is described as the first coil 51a, the coil of the V phase is described as the second coil 51b, and the coil of the W phase is described as the third coil 51c (see Figure 8A 、 Figure 8B and Figure 8C The insulating paper 20 includes insulating paper 20a disposed between the first coil 51a and the second coil 51b, and insulating paper 20b disposed between the second coil 51b and the third coil 51c. The stator core 1 is constructed by stacking electromagnetic steel sheets. The stator 10 is combined with a rotor, bearings, bracket, housing, and other components (not shown) to form the electric motor 90.

[0033] For the convenience of explanation, Figure 1 The four U-phase first coils 51a and one insulating paper 20a are shown in FIG. Figure 2 , four U-phase first coils 51a, one insulating paper 20a, and one V-phase second coil 51b are shown. In fact, in the stator core 1, four first coils 51a are arranged at 90-degree intervals along the circumferential direction of the stator core 1 (hereinafter referred to as simply the circumferential direction), four second coils 51b are arranged at 90-degree intervals along the circumferential direction, and four third coils 51c are arranged at 90-degree intervals along the circumferential direction. In addition, four insulating papers 20a are arranged between the four first coils 51a and the four second coils 51b, and four insulating papers 20b are arranged between the four second coils 51b and the four third coils 51c. In Figure 1 and Figure 2, 36 slots 31 are formed along the circumferential direction of the cylindrical inner peripheral surface of the stator core 1 and the coils 51 are inserted into the slots 31 in a three-phase distributed winding manner. However, the present invention is not limited to this configuration example.

[0034] The first coil 51a has a first portion 51a1, which is received in the first slot 31a, which is a slot into which both the first coil 51a and the second coil 51b are inserted. The second coil 51b has a second portion 51b1 received in the first slot 31a. The insulating paper 20a includes: a pair of sheet-like insulating portions 201, 202 protruding from a pair of end faces 1a, 1b in the axial direction of the stator core 1, and a plurality of legs 211 to 215 connecting the pair of sheet-like insulating portions 201, 202 (see FIG. 2 ). Figure 3 A pair of sheet-like insulating portions 201 and 202 are positioned between a first coil end 51a2 extending outward from first portion 51a1 and outward from a pair of end faces 1a and 1b, respectively, and a second coil end 51b2 extending outward from second portion 51b1 and outward from a pair of end faces 1a and 1b, respectively. Multiple legs 211 to 215 include a first leg 211 inserted into first slot 31a and positioned between first portion 51a1 and second portion 51b1.

[0035] When assembling the stator 10, the first coil 51a is first inserted into the slot 31. Insulation paper 20a is then attached to the coil ends of the first coil 51a, which protrude from the end faces 1a and 1b of the stator core 1 in the axial direction (direction of the central axis AX). Next, the second coil 51b is inserted into the slot 31. Insulation paper 20b is then attached to the coil ends of the second coil 51b, which protrude from the end faces 1a and 1b of the stator core 1 in the axial direction (direction of the central axis AX). Next, the third coil 51c is inserted into the slot 31. For example, the coils 51 can be attached to the slot 31 by attaching the coils to be inserted simultaneously to an insertion plate of an insertion device, and inserting each coil from the end face 1a side toward the end face 1b side.

[0036] like Figure 1 As shown, the first coil 51a includes a large coil 551 of 5 slot pitches and a small coil 552 of 3 slot pitches arranged circumferentially inside the large coil 551. The large coil 551 is formed by winding a winding member corresponding to one slot, and the small coil 552 is formed by winding a winding member corresponding to half a slot (see the following description). Figure 8A 、 Figure 8B and Figure 8C). That is, the first coil 51a is formed by winding a winding member corresponding to 1.5 slots. Similarly, the second coil 51b also includes a large coil 561 with a pitch of 5 slots and a small coil 562 arranged inside the large coil 561 in the circumferential direction (see the following). Figure 8A 、 Figure 8B and Figure 8C The large coil 561 is formed by winding a winding member corresponding to one slot, and the small coil 562 is formed by winding a winding member corresponding to half a slot (see the following). Figure 8A 、 Figure 8B and Figure 8C ) That is, the second coil 51b is formed by winding a winding member corresponding to 1.5 slots. The third coil 51c also has the same structure as the first coil 51a and the second coil 51b.

[0037] Figure 2 FIG. 1 shows a state where a second coil 51b is mounted radially inward of the stator core 1 with respect to the first coil 51a, with the insulating paper 20a interposed therebetween. Figure 1 and Figure 2 As shown, the first coil 51 a and the second coil 51 b are arranged to overlap each other in a range of three slots from the right end among six slots within the width of the first coil 51 a in the circumferential direction of the stator core 1 .

[0038] The insulating paper 20 is made of a material having excellent electrical insulation properties (eg, a plastic material). The insulating paper 20 can be produced by cutting a blank from a single sheet (film) in a punching process and bending the resulting blank in a pressing process. Figure 3 2 is a perspective view of the insulating paper 20a. Figure 3 In the diagram, the direction corresponding to the axis direction is defined as the up-down direction, and the left-right direction is defined as shown in the figure. Figure 3 As shown, the insulating paper 20a has a structure that extends from one end face 1a of the stator core 1 (see Figure 1 ) is configured so as to protrude from the other end surface 1b of the stator core 1 (see Figure 1 ) is arranged so as to protrude from the sheet-like insulating portion 202. The insulating paper 20a further includes a plurality of legs 211 to 215 extending 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.

[0039] The sheet-shaped insulating portion 201 includes a protruding main portion 201c connected to the first leg portion 211 and interposed between the first coil end 51a2 and the second coil end 51b2, and auxiliary portions 201a and 201b extending from the main portion 201c. The auxiliary portion 201b is separated from the first coil end 51a2 and positioned radially outward of the second coil end 51b2 relative to the stator core 1. The main portion 201c covers the radially inward portion of the coil end of the first coil 51a that protrudes from the end face 1a of the stator core 1. Similarly, the sheet-shaped insulating portion 202 includes a protruding main portion 202c connected to the first leg portion 211 and interposed between the first coil end 51a2 and the second coil end 51b2, and auxiliary portions 202a and 202b extending from the main portion 202c. The auxiliary portion 202b is separated from the first coil end 51a2 and arranged radially outward of the second coil end 51b2 in the stator core 1. The main portion 202c covers the radially inner portion of the coil end of the first coil 51a protruding from the end surface 1b of the stator core 1.

[0040] The main portion 201c and the main portion 202c are connected by two legs 211 and 212. Figure 2 As shown, the two legs 211 and 212 are arranged in the range where the first coil 51a and the second coil 51b overlap on the main part 201c and 202c. Specifically, the second leg 212 is accommodated in the slot 31b (hereinafter also referred to as the second slot 31b) that does not accommodate the first coil 51a but accommodates the second coil 51b. The second leg 212 is arranged between the inner surface of the second slot 31b and the second coil 51b. The first leg 211 is accommodated in the first slot 31a as described above. In addition, the leg 215 is also accommodated in the slot 31 that does not accommodate the first coil 51a but accommodates the second coil 51b, similarly to the second leg 212. A plurality of legs are provided in the range where the first coil 51a and the second coil 51b overlap on the main part 201c (202c) of the insulating paper 20a, thereby Figure 1 When the second coil 51b is inserted into the slot 31 from above for installation in the state shown, the insulating paper 20a, particularly the lower sheet-like insulating portion 202, is prevented from being pulled by the second coil 51b, causing the insulating paper 20a to deform, become displaced, or become entangled. In this embodiment, since the first leg 211 is arranged at a position in the first slot 31a of the sheet-like insulating portions 201 and 202, where a strong pulling force is likely to act when the second coil 51b is inserted from above, the insulating paper 20a can be more reliably prevented from deforming, becoming displaced, or becoming entangled. In addition, the arrangement of the first leg 211 in the first slot 31a, into which both the first coil 51a and the second coil 51b are inserted, also helps to improve the insulation between the first coil 51a and the second coil 51b.

[0041] Figure 4 This is a diagram showing a portion of the stator core 1 on the end surface 1a side where the first coil 51a is arranged, as viewed from above. Figure 4 As shown, 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 first coil 51a. Figure 3 The left end of the main portion 201c is connected to the right end of the auxiliary portion 201a via a connecting surface 201f. The right end of the main portion 201c is connected to the left end of the auxiliary portion 201b via a connecting surface 201g. The left end of the main portion 202c is connected to the right end of the auxiliary portion 202a via a connecting surface 202f. The right end of the main portion 202c is connected to the left end of the auxiliary portion 202b via a connecting surface 202g.

[0042] The sharp upper end of the bent portion at the boundary between the main portion 201c and the connecting surface 201f is removed to form a notch 205. Similarly, the sharp upper end of the bent portion at the boundary between the main portion 201c and the connecting surface 201g is removed to form a notch 206. In this way, by providing the notches 205 and 206 in the sheet-like insulating portion 201, the second coil 51b can be connected to the sheet-like insulating portion 201. Figure 1 When the second coil 51b is inserted into the downward groove 31 from above, it is possible to avoid a situation in which the second coil 51b is caught on the sharp upper end of the bent portion and the insulating paper 20a is entangled.

[0043] The plurality of legs 211 to 215 each have a shape that maintains their position by elastic restoring force when deformed by contact with the inner surface of the groove 31. Figure 3 As shown by the circled portion on the right side of the center, the cross-sectional shape of each leg 211 to 215, when viewed vertically, is shaped like the Japanese character "ハ." Legs 211 to 215 have the same structure, so the following description will focus on the first leg 211 as a representative example. The first leg 211 includes a main leg surface 211a substantially parallel to the main portion 201c, and left and right sides 211b and 211c that protrude radially inward from the left and right edges of the main leg surface 211a. The distance between the left and right sides 211b and 211c increases as one moves from the main leg surface 211a toward the center axis AX.

[0044] like Figure 3 As shown, in each leg portion 211 to 215 , the portion consisting of the main leg surface 211 a , the left side surface 211 b , and the right side surface 211 c is formed excluding the connection portion between the leg portion 211 to 215 and the sheet-shaped insulating portion 201 and the connection portion between the leg portion 211 to 215 and the sheet-shaped insulating portion 202 .

[0045] Figure 5This is a cross-sectional view of a slot of the stator core 1 cut along a plane perpendicular to the central axis AX, illustrating the relationship between the width of the first leg portion 211 and the width of the slot 31. The width of the main leg surface 211a of the first leg portion 211, i.e., the width C along the circumferential direction of the stator core 1, corresponds to the width D of the opening 32 at the radially inner end of the stator core 1, which allows passage through the slot 31 (D ≥ C). Therefore, by bending the left and right side surfaces 211b, 211c at least 90° relative to the main leg surface 211a, the first leg portion 211 can be pushed deeper into the slot 31 by passing through the opening 32 of the slot 31.

[0046] When the left side 211b and right side 211c of the first leg portion 211 pass through the opening 32 of the slot 31, elastic restoring force acts, causing the first leg portion 211 to return to a shape in which the distance between them increases as they move away from the main leg surface 211a. The total width (maximum width) E between the left side 211b and right side 211c of the first leg portion 211 in its natural state is greater than the width F of the internal space of the slot 31 along the circumferential direction of the stator core 1, that is, the distance between the inner surfaces of the slot 31 in the circumferential direction (E>F). In addition to the width D of the opening 32, the slot 31 has a constant width F along the radial direction of the stator core 1. With this structure, the first leg portion 211 maintains its position using elastic restoring force even when deformed by contact with the inner surface of the slot 31.

[0047] Next, the method of installing the insulating paper 20a will be described. Figure 1 As shown, the first coil 51a is arranged in such a manner that the first coil 51a is inserted into the prescribed slot 31 of the stator core 1. Thus, the coil end 56 of the first coil 51a is formed in such a manner as to protrude from the end faces 1a, 1b of the stator core 1. Next, the insulating paper 20a is installed from the radial inside relative to the stator core 1. In detail, the installation is performed as follows. The insulating paper 20a is installed on the stator core 1 in such a manner that the sheet-like insulating portion 201 covers the coil end 56 on the end face 1a side from the radial inside of the stator core 1, and the sheet-like insulating portion 202 covers the coil end 56 on the end face 1b side from the radial inside of the stator core 1. At this time, the first leg 211 is inserted into the first slot 31a, and the second leg 212 is inserted into the second slot 31b. The leg 213 is inserted into the outer side ( Figure 1 The leg portion 214 and the leg portion 215 are respectively inserted into the outer side ( Figure 1 At this time, the legs 211 to 215 are all pushed in and inserted into the deep side of the groove 31.

[0048] exist Figure 10, a diagram showing a state where four first coils 51a are mounted on the stator core 1 and four insulating papers 20a are mounted inside the stator core 1 as viewed from above. Figure 10 As shown, the four insulating papers 20a are arranged 90 degrees apart in the circumferential direction, with the circumferential ends of adjacent insulating sheets 201 bent and overlapping. This completely covers the radially inner portions of the four first coils 51a relative to the stator core 1. Furthermore, space is ensured radially inward of the four insulating papers 20a for mounting the second coils 51b and other components.

[0049] exist Figure 6 , a state is shown 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. Figure 7 As a comparative example, a state in which a pulling force is applied to the insulating paper 400 having only one 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 is shown. Figure 6 and Figure 7 In the example, the sheet-shaped insulating portions 201 and 202 and the sheet-shaped insulating portions 401 and 402 act with the same force on the position where the second coil 51b is supposed to be strongly pulled when it is inserted into the stator core 1. Figure 6 and Figure 7 , then we can know Figure 6 The deformation ratio of the double arrow X0 part Figure 7 The deformation of the portion indicated by the double-headed arrow X1 is small. Therefore, when the second coil 51b is inserted, the offset between the sheet-like insulating portions 201 and 202 of the insulating paper 20a is smaller than the offset 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 this embodiment can more reliably prevent deformation and displacement of the first-inserted insulating paper due to being pulled by the later-inserted winding.

[0050] exist Figure 8A 、 Figure 8B and Figure 8C , a development diagram showing 36 slots 31 arranged in a circumferential direction on the inner peripheral surface of the stator core 1 developed in a straight line. Figure 8A 、 Figure 8B and Figure 8C The following diagrams represent the cross-sections of the 36 slots cut along a plane perpendicular to the axial direction. These expanded diagrams show the filling state of the coil into each slot 31 and the configuration state of the insulating paper. Figure 8A 、 Figure 8B and Figure 8C The coils of each phase are represented by the reference signs "+U", "-U", "+V", "-V", "+W", "-W". Here, "+" and "-" represent the coils perpendicular to the Figure 8A 、 Figure 8B and Figure 8C The direction of the current is in the direction of the paper. Figure 8A The diagram shows a state where the first coil 51 a and the insulating paper 20 a are arranged in the 36 slots 31 . Figure 8B Indicates from Figure 8A The state of the second coil 51b and the insulating paper 20b is further arranged. Figure 8C Indicates from Figure 8B The state of the third coil 51c is further configured. Figure 8A 、 Figure 8B and Figure 8C In the figure, the slot located at the left end is set as slot number 1, and the slot numbers are assigned in a manner that increases from the left side to the right side in the figure.

[0051] exist Figure 8A In the embodiment, one of the four first coils 51a is represented by a reference numeral. Figure 8A In FIG, four insulating papers 20a are indicated by solid lines, and one insulating paper 20a is representatively indicated by a thick solid line and a reference numeral is given to it. Figure 8A In FIG. 6 , the circular mark 6 (only a part of the reference numeral is given) indicates the position of the leg portions 211 to 215 of the insulating paper 20a. Figure 8A In the state where the insulating paper 20a is installed as shown, the legs of the insulating paper 20a can be arranged in the empty slot or the half-empty slot. Figure 8A , then with respect to 36 slots 31, four first coils 51a of 5 slot pitch are arranged at 90-degree intervals. The first coil 51a is constructed by winding a winding member corresponding to 1.5 slots. Figure 8A In the insulating paper 20a marked with reference numerals, the legs 212 and 211 are respectively inserted into the 13th and 14th slots S13 and S14, the leg 213 is inserted into the 9th slot S9, and the legs 214 and 215 are respectively inserted into the 16th and 17th slots S16 and S17.

[0052] exist Figure 8B In the embodiment, one of the four second coils 51b is represented by a reference numeral. Figure 8B In FIG, four insulating papers 20b are indicated by solid lines, and one insulating paper 20b is representatively indicated by a thick solid line and a reference numeral is given to it. Figure 8B In the figure, the circular mark 6 (only a part of it is marked with a reference numeral) indicates the position of the leg of the insulating paper 20b. When the insulating paper 20a and the insulating paper 20b are installed, the leg of the insulating paper 20b can be arranged in an empty slot or a half-empty slot. Figure 8BAs shown, the second coil 51b has a third portion 51b3, and the third portion 51b3 is accommodated in the slot (second slot) that does not accommodate the first coil 51a. Figure 8B , four second coils 51b having a five-slot pitch are arranged at 90-degree intervals with respect to the 36 slots 31. The second coil 51b is formed by winding a winding member corresponding to 1.5 slots.

[0053] like Figure 8C As shown in FIG, the third coil 51c is arranged to overlap with the second coil 51b. Figure 8C In the diagram, the third coil 51c is represented by a reference numeral. The third coil 51c is constructed by winding a winding member corresponding to 1.5 slots. Since the first coil 51a through the third coil 51c are each constructed by winding a winding member corresponding to 1.5 slots, by installing all the first coils 51a through the third coil 51c in the slots 31, all 36 slots are filled.

[0054] The second coil 51b has a fourth portion (at Figure 8C The fourth portion is designated by reference numeral 68a in FIG. 5 , and is housed in the slot S17 into which both the second coil 51b and the third coil 51c are inserted. The third coil 51c has a fifth portion 69a housed in the slot S17.

[0055] Insulation paper 20b is installed between the second coil 51b and the third coil 51c. Figure 9 In the figure, a perspective view of the insulating paper 20b is shown. Figure 9 In the figure, the direction corresponding to the axial direction is defined as the vertical direction, and the left-right direction is defined as shown in the figure. The insulating paper 20b includes a pair of sheet-like insulating portions 501 and 502 that protrude from a pair of end faces 1a and 1b of the stator core 1 in the axial direction, and a plurality of legs 511 to 514 that connect the pair of sheet-like insulating portions 501 and 502. The pair of sheet-like insulating portions 501 and 502 are respectively arranged between the coil end of the second coil 51b extending outward from the fourth portion 68a toward the pair of end faces 1a and 1b, and the coil end of the third coil 51c extending outward from the fifth portion 69a toward the pair of end faces 1a and 1b. The plurality of legs 511 to 514 include a first leg 511 that is inserted into the slot S17 and arranged between the fourth portion 68a and the fifth portion 69a.

[0056] like Figure 9As shown, sheet-like insulating portion 501 is arranged to protrude from one end face 1a of stator core 1. Sheet-like insulating portion 502 is arranged to protrude from the other end face 1b of stator core 1. Multiple legs 511 to 514 extend along the axial direction of stator core 1 to connect sheet-like insulating portion 501 and sheet-like insulating portion 502.

[0057] The sheet-shaped insulating portion 501 includes a main portion 501c connected to the first leg 511 and interposed between the coil ends of the second coil 51b and the third coil 51c, and auxiliary portions 501a and 501b extending from the main portion 501c. The auxiliary portion 501b is separated from the coil end of the second coil 51b and positioned radially outward of the coil end of the third coil 51c on the stator core 1. The main portion 501c covers the radially inward portion of the coil end of the second coil 51b that protrudes from the end face 1a of the stator core 1. Similarly, the sheet-shaped insulating portion 502 includes a main portion 502c connected to the first leg 511 and interposed between the coil ends of the second coil 51b and the third coil 51c, and auxiliary portions 502a and 502b extending from the main portion 501c. The auxiliary portion 502b is separated from the coil end of the second coil 51b and is arranged radially outward of the coil end of the third coil 51c in the stator core 1. The main portion 502c covers the radially inward portion of the coil end of the second coil 51b that protrudes from the end surface 1b of the stator core 1.

[0058] The main portion 501c and the main portion 502c are connected by means of two legs 511 and 512. Figure 8A 、 Figure 8B and Figure 8CAs shown, the two legs 511 and 512 are arranged on the main parts 501c and 502c in the range where the second coil 51b and the third coil 51c overlap. Specifically, the second leg 512 is accommodated in the slot S16 that does not accommodate the first coil 51a and the second coil 51b. The first leg 511 is accommodated in the slot S17 for accommodating the second coil 51b and the third coil 51c. A plurality of legs are provided on the main part 501c (502c) of the insulating paper 20b. This prevents the insulating paper 20b, especially the lower sheet-like insulating portion 502, from being pulled by the third coil 51c, causing the insulating paper 20b to be deformed, displaced, or entangled, when the third coil 51c is inserted from above into the slot 31 after the first coil 51a, the insulating paper 20a, the second coil 51b, and the insulating paper 20b are installed. In this embodiment, since the first leg 511 is positioned in the slot S17 of the sheet-like insulating portion 501, 502, where a strong pulling force is thought to be likely to act when the third coil 51c is inserted from above, the insulating paper 20b can be more reliably prevented from deforming and becoming misplaced or entangled. In addition, positioning the first leg 511 in the slot S17, into which both the second coil 51b and the third coil 51c are inserted, also helps improve the insulation between the second coil 51b and the third coil 51c. The legs 511 to 514 of the insulating paper 20b all have the same shape as the legs 211 to 215 of the insulating paper 20a, forming the shape of the Japanese character "ハ" when viewed in cross-section along the axial direction.

[0059] The two central legs 511-512 of the four legs 511-514 of the insulating paper 20b are inserted into the two slots 31 of the second coil 51b, which are within a range corresponding to six slots in the circumferential direction, and are located in the overlapped range of the second coil 51b and the third coil 51c. Specifically, the legs 511-512 are mounted in the 16th and 17th slots S16 and S17 of the second coil 51b, which are within a range corresponding to six slots, and are located for inserting the third coil 51c. The leg 513 is inserted into the outer side of the second coil 51b in the circumferential direction (in the middle). Figure 8B The leg portion 514 is inserted into the 12th slot S12 located outside the second coil 51b in the circumferential direction (on the left side). Figure 8B The 20th slot S20 is on the right side (in the middle).

[0060] exist Figure 11 In, it means from Figure 10 In the state of further installing four second coils 51b on the stator core 1, and installing four insulating papers 20b inside the stator core 1. In the case of the insulating paper 20b, two legs 511 and 512 are formed in the overlapping range of the second coil 51b and the third coil 51c, so that the insulating paper 20b can be prevented from being deformed and displaced or entangled when the third coil 51c is inserted into the slot 31. Figure 11 As shown, the four insulating papers 20b are arranged 90 degrees apart in the circumferential direction, with the circumferential ends of adjacent insulating sheets 501 bent and overlapping. This ensures that the radially inner portions of the four second coils 51b relative to the stator core 1 are completely covered by the four insulating papers 20b. Furthermore, space for mounting the third coil 51c is ensured radially inward of the four insulating papers 20b.

[0061] As described above, according to this embodiment, it is possible to prevent the insulating paper inserted earlier from being displaced by the winding wire inserted later.

[0062] While the embodiments of the present disclosure have been described above, it is expected that those skilled in the art will recognize that various modifications and changes can be made without departing from the scope of the disclosure of the claims.

[0063] Figure 3 The structure of the insulating paper 20a shown is an example, and various modifications can be made to the insulating paper 20a. Figure 12 In the figure, as a modified example of the insulating paper 20a, a perspective view of an insulating paper 20e is shown in which protrusions 207 and 208 are added to the insulating paper 20a. In addition to the addition of the protrusions 207 and 208, the insulating paper 20e has the same Figure 3 The insulating paper 20a shown in FIG. has the same structure. The insulating paper 20e has protrusions 207, 208, which are protrusions 207, 208 provided to protrude from a pair of sheet-like insulating portions 201, 202 in the same direction as the legs 211, 212, respectively, and the protrusions 207, 208 cover the roots of the coil ends of the second coil 51b on the outer sides of the pair of end faces 1a, 1b, respectively. In detail, the protrusion 207 is formed at a position where no leg is formed in the range where the first coil 51a and the second coil 51b overlap, in the side 201e of the main part 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 part 202c adjacent to the stator core 1. As an example, the protrusions 207, 208 may also be formed in the slot (in the slot where the first coil 51a is inserted) into which the first coil 51a is inserted. Figure 8A The projections 207 and 208 may be formed into a planar shape having a width of one groove width.

[0064] exist Figure 13, the insulating paper 20e is inserted between the first coil 51a and the second coil 51b. The protrusions 207 and 208 are positioned so that the base of the coil end of the first coil 51a, which was inserted first into the slot 31, overlaps with the base of the coil end of the second coil 51b, which was inserted later. This structure places the protrusions 207 and 208 between the bases of the coil ends of the first coil 51a and the second coil 51b, further enhancing insulation between the first coil 51a and the second coil 51b.

[0065] Figure 14 This is an enlarged view of the protrusion 207 and its vicinity in a state where the insulating paper 20e is installed between the first coil 51a and the second coil 51b. Figure 14 It can be understood that the protrusion 207 is interposed between the base of the coil end of the first coil 51 a and the base of the coil end of the second coil 51 b .

[0066] The insulating paper of the above embodiment is described as a component used between coils of different phases of a three-phase AC motor, but the insulating paper of the above embodiment can be used for insulation between coils of various types of motors in which multiple coils are arranged in a distributed winding manner and overlapped in slots of a stator core.

Claims

1. A stator, characterized in that: The stator has: a stator core having a plurality of slots; a first coil and a second coil, which are inserted into the plurality of slots in a distributed winding manner; as well as Insulating paper is arranged between the first coil and the second coil, The first coil has a first portion received in the first slot. The second coil has a second portion received in the first slot. The insulating paper includes: a pair of sheet-shaped insulating portions protruding from a pair of end surfaces of the stator core in the axial direction, and a plurality of legs connecting the pair of sheet-shaped insulating portions. The pair of sheet-shaped insulating portions are respectively arranged between a first coil end of the first coil extending from the first portion toward the outside of each of the pair of end faces and a second coil end of the second coil extending from the second portion toward the outside of each of the pair of end faces. The plurality of legs include a first leg inserted into the first groove and disposed between the first portion and the second portion. The pair of sheet-like insulating parts each have: a main portion connected to the first leg portion and interposed between the first coil end and the second coil end; and an auxiliary portion extending from the main portion, separated from the first coil end, and arranged at a position radially outward of the stator core relative to the second coil end, the insulating paper having a protrusion, which is a protrusion provided to protrude from the pair of sheet-shaped insulating portions in the same direction as the first leg portion, the protrusion covering the root of the first coil end connected to the first portion on the outer side of each of the pair of end surfaces, The protrusion is formed on the respective side edges of the main parts of the pair of sheet-like insulating parts adjacent to the pair of end faces of the stator core, at a position where the first leg is not formed within the overlapping range of the first coil and the second coil, and the protrusion is formed into a planar shape having a width of 1 slot width.

2. The stator according to claim 1, characterized in that The second coil has a third portion, and the third portion is received in the second slot that does not receive the first coil. The plurality of legs include a second leg disposed between an inner surface of the second groove and the third portion.

3. The stator according to claim 2, characterized in that The plurality of legs include one second leg connected to the main portion and another second leg connected to the sub-portion.

4. The stator according to any one of claims 1 to 3, characterized in that: Each of the plurality of legs has a shape in which its position is maintained by elastic restoring force in a state in which it is deformed by contact with the inner surface of the groove.

5. An electric motor, characterized in that: This electric motor includes the stator according to any one of claims 1 to 4.

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