Interphase insulation paper, stator and motor

Abstract

The invention relates to the technical field of motors, in particular to interphase insulation paper, a stator and a motor. The interphase insulation paper comprises a pair of oppositely-arranged strip-shaped main bodies and a plurality of connecting parts, the strip-shaped main bodies are at least partially arranged between winding end parts of the stator winding, the winding end parts of the stator winding are arranged in a protruding mode from the two axial ends of the stator iron core, and the connecting parts are arranged in stator grooves of the stator iron core and connected with the strip-shaped main bodies; before the band-shaped main body is installed between the stator windings, the interphase insulation paper forms a wave-shaped fold from the axial direction of the state of being installed on the stator core. According to the interphase insulation paper, the stator and the motor provided by the invention, the operability can be improved only by installing single interphase insulation paper on the stator. Compared with the prior art in which a plurality of pieces of small-size interphase insulation paper are installed, the single interphase insulation paper is not prone to dislocation and winding, and the quality of the stator and the quality of the motor are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of electric motors, and in particular to an interphase insulating paper, a stator and an electric motor. Background Art

[0002] In recent years, in order to reduce the size of electric motors and increase their output power, it is necessary to reliably insulate the different phases in the motor. As an example of such motors, for example, motors used in the field of electric vehicles, various insulating materials are used to ensure the insulation between different phase windings and between windings and stators.

[0003] In the following patent document 1, as shown in the figure, the electric motor used in an electric vehicle has a cylindrical stator core and a multi-phase stator winding, wherein the stator core has a plurality of stator slots extending axially along the inner circumference and intermittently arranged in the circumferential direction, and a multi-phase (for example, three-phase) stator winding is wound on the stator core.

[0004] Slot insulation paper for ensuring insulation between the stator winding and the stator core is arranged in the stator slots, and the stator winding is accommodated in the stator slots in a distributed winding manner through the slot insulation paper.

[0005] The interphase insulating paper is arranged between the phase windings of the distributed winding stator winding to ensure the insulation between the different phase windings. When the interphase insulating paper is arranged between the different phase stator windings, the annular winding formed by mechanical winding is inserted into the stator slot in a state where the annular windings are connected in series. Thereafter, the winding end exposed from the end surface of the stator core is expanded toward the outer diameter side, for example, by mechanical forming.

[0006] Secondly, interphase insulating paper is set on the inner diameter side of the annular winding in the slot. After the interphase insulating paper is set, then, the middle phase annular windings of all poles are inserted into the inner diameter side, and the winding ends are expanded toward the outer diameter side. After that, the process of setting the interphase insulating paper, inserting the annular windings of all poles, and expanding the winding ends toward the outer diameter side is repeated according to the number of phases. If it is a three-phase winding, the interphase insulating paper is set on the inner diameter side of the middle phase annular winding (the winding ends are expanded toward the outer diameter side), and then the annular windings of the inner phases are set on the inner diameter side to end the operation. The ends of the inner phase annular windings do not need to be expanded toward the outer diameter side.

[0007] As described above, the annular winding is inserted into the slot of the stator core. However, since the annular winding contacts the previously inserted interphase insulation paper, the interphase insulation paper may be misaligned or entangled, and there is a risk of damage to the interphase insulation paper. Summary of the invention

[0008] The purpose of the present invention is to provide an interphase insulating paper, a stator and a motor, which are not prone to the problems of misalignment, entanglement and damage.

[0009] To achieve this object, the present invention adopts the following technical solutions:

[0010] Provided is an interphase insulating paper, which is arranged between stator windings of different phases. The interphase insulating paper comprises a pair of oppositely arranged strip-shaped bodies and a plurality of connecting portions. The strip-shaped body is at least partially arranged between winding ends of the stator winding, and the winding ends of the stator winding are protruded from both axial ends of a stator core. A plurality of connecting portions are arranged in stator slots of the stator core and connected to the strip-shaped body. Before the strip-shaped body is installed between the stator windings, the interphase insulating paper forms a wave-shaped fold when viewed from the axial direction when installed in the stator core.

[0011] As a preferred technical solution for the above-mentioned interphase insulating paper, the interphase paper is bent to form a generally hollow cylindrical structure.

[0012] As a preferred technical solution for the above-mentioned interphase insulating paper, the strip-shaped body forms a wavy fold when viewed axially when installed on the stator core, and forms a bend toward the radial outer peripheral side of the stator core when viewed along the axial direction of the stator core.

[0013] As a preferred technical solution of the above-mentioned interphase insulating paper, the corrugated fold is at least arranged between adjacent connecting portions.

[0014] As a preferred technical solution of the above-mentioned interphase insulating paper, at least part of the corrugated folds overlap with the side of the connecting portion.

[0015] As a preferred technical solution of the above-mentioned interphase insulating paper, at least one of the strip-shaped bodies is provided with a groove, and along the axial direction of the stator core, the groove is arranged in the same direction as the winding end of the stator winding.

[0016] As a preferred technical solution of the above-mentioned interphase insulating paper, the grooves are arranged at intervals along the length direction of the strip-shaped body;

[0017] Alternatively, the grooves are continuously arranged along the length direction of the strip-shaped body.

[0018] As a preferred technical solution of the above-mentioned interphase insulation paper, the interphase insulation paper is an integrally formed paper.

[0019] The present invention also provides a stator, comprising a stator winding, interphase insulation paper and a stator core, wherein the stator core comprises a yoke extending in the circumferential direction and a plurality of teeth extending from the yoke along the radial inner circumferential side, the stator winding is inserted into a stator slot formed by the plurality of teeth, the interphase insulation paper is installed between different phases of the stator winding, and the interphase insulation paper is the interphase insulation paper described in any of the above schemes.

[0020] The present invention further provides an electric motor, comprising a rotor and the stator described in the above scheme, wherein the rotor and the stator are rotatably arranged relative to each other.

[0021] The present invention has at least the following beneficial effects:

[0022] The interphase insulating paper, stator and motor provided by the present invention only need to install a single interphase insulating paper on the stator to improve operability. Compared with installing multiple small-sized interphase insulating papers in the prior art, the single interphase insulating paper is not prone to misalignment and entanglement problems, ensuring the quality of the stator and the motor. Before being installed between the stator windings, the strip-shaped body of the interphase insulating paper is bent to form a corrugated fold. Compared with the corrugated strip-shaped body formed after being installed between the stator windings, the interphase insulating paper is easier to shape (adjust the size of the corrugated shape, etc.).

[0023] The wave-shaped folds formed on the phase-to-phase insulating paper can make it roughly present a hollow cylindrical shape, thereby improving the efficiency of installing it on the stator core.

[0024] When the interphase insulation paper is installed in the stator core, it will be bent toward the radial outer peripheral side. In this way, when the stator winding is inserted into the stator core, the interphase insulation paper will not interfere with the stator winding, which can effectively prevent problems such as misalignment and entanglement of the interphase insulation paper. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0026] Figure 1 A three-dimensional diagram of a stator provided in an embodiment of the present invention.

[0027] Figure 2 A plan view of a stator provided in an embodiment of the present invention.

[0028] Figure 3 This is an expanded view of the interphase insulation paper provided in an embodiment of the present invention.

[0029] Figure 4 A three-dimensional diagram of the interphase insulation paper provided in an embodiment of the present invention.

[0030] Figure 5 A three-dimensional diagram of a stator with stator winding 1 phase-divided and inserted provided in an embodiment of the present invention.

[0031] Figure 6A three-dimensional diagram of a stator with phase divisions of stator winding 1 and middle and outer interphase insulation paper inserted in an embodiment of the present invention.

[0032] Figure 7 A plan view of a stator with phase divisions of stator winding 1 and middle and outer interphase insulation paper inserted is provided for an embodiment of the present invention.

[0033] Figure 8 A three-dimensional diagram of a stator with two phases of stator winding and middle and outer interphase insulation paper inserted, provided for an embodiment of the present invention.

[0034] Fig. 9 A three-dimensional diagram of a stator with two phases of stator windings and middle and outer interphase insulation paper and inner and middle interphase insulation paper inserted in an embodiment of the present invention.

[0035] Fig.10 The embodiment of the present invention provides a stator winding 2-phase and outer layer interphase insulation paper and inner and middle layer phase

[0036] Stator plan view with insulation paper between the two ends.

[0037] Fig.11 A three-dimensional diagram of a stator with three phases of stator windings and middle and outer interphase insulation paper and inner and middle interphase insulation paper inserted in an embodiment of the present invention.

[0038] Fig.12 A plan view of a stator with three phases of stator windings and middle and outer interphase insulation paper and inner and middle interphase insulation paper inserted is provided for an embodiment of the present invention.

[0039] Fig.13 This is a perspective view of a substantially cylindrical interphase insulation paper before being attached to a stator core in a comparative example of the present invention.

[0040] Fig.14 It is a development view of a substantially cylindrical interphase insulation paper in a comparative example of the present invention.

[0041] Fig.15 This is a perspective view of a substantially cylindrical interphase insulation paper mounted on a stator core in a comparative example of the present invention.

[0042] Fig.16 This is a perspective view showing a corrugated strip portion of a substantially cylindrical interphase insulating paper attached to a stator core in a comparative example of the present invention.

[0043] Fig.17 An enlarged plan view of a key portion of the interphase insulating paper provided in an embodiment of the present invention, in which the strip-shaped portion is in a corrugated state through mechanical forming.

[0044] Fig.18 An enlarged plan view of a key portion of the embodiment of the present invention in which a fold is used to make the strip-shaped portion in a wavy state.

[0045] Fig.19 A longitudinal cross-sectional view of an example of a motor provided by an embodiment of the present invention.

[0046] In the figure:

[0047] 100: stator;

[0048] 200: stator core; 200A: first stator core end surface; 200B: second stator core end surface; 200a: rotor insertion hole; 210: yoke; 220: tooth portion; 221: tooth bottom; 222: tooth front end portion; 222a: tooth front end surface; 231: stator slot;

[0049] 300: stator winding; 301: first phase winding; 302: second phase winding; 303: third phase winding;

[0050] 400: slot insulation paper; 400a: folded portion;

[0051] 500: interphase insulation paper; 700: original interphase insulation paper; 500A: middle and outer interphase insulation paper; 500B: middle and inner interphase insulation paper; 700A: original middle and outer interphase insulation paper; 700B: original middle and inner interphase insulation paper; 510: tooth insertion hole; 710: original tooth insertion hole; 520: connection part; 720: original connection part; 530: first strip-shaped body; 540: second strip-shaped body; 730: original First strip-shaped body; 740: original second strip-shaped body; 550: concave portion; 750: original concave portion; 550a: first inclined portion; 550b: second inclined portion; 750a: original first inclined portion; 750b: original second inclined portion; 550c: bottom edge; 750c: original bottom edge; 560: first fold; 570: second fold; 580: first part; 590: second part; 600: third part;

[0052] 800: Wedge;

[0053] 900: rotor; 910: bracket; 920: bearing. DETAILED DESCRIPTION

[0054] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0055] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0057] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0058] Embodiment 1

[0059] It can be seen from the Japanese patent document JP2020150683 (A) disclosed in the prior art that four first windings and four second windings are arranged at intervals of 90 degrees along the circumference of the stator core. Interphase insulation paper is provided between each first winding and the adjacent second winding, that is, the number of interphase insulation papers is four. In addition, four third windings are also provided at intervals of 90 degrees along the circumference of the stator core. Interphase insulation paper is also provided between each second winding and the third winding, that is, the number of interphase insulation papers is eight in total.

[0060] The stator core has two axial end faces, which are respectively recorded as the first axial end face and the second axial end face. The interphase insulating paper includes a pair of strip-shaped insulating parts protruding from the first axial end face and the second axial end face, and a plurality of connecting parts connecting the pair of strip-shaped insulating parts. The pair of strip-shaped insulating parts are arranged between the winding end of the first winding and the winding end of the second winding, and the plurality of connecting parts are arranged in the stator slots of the stator core.

[0061] The structure of the interphase insulating paper and the assembly method thereof can prevent the problems of misalignment, entanglement and damage caused by the interphase insulating paper assembled first contacting the second winding inserted later.

[0062] The embodiments of the present invention refer to Figure 1-Figure 19 In addition, the term "axial direction" in this specification refers to the direction in which Fig.19 The rotor 900 shown is similar to Figure 1 , Figure 2 , Fig.19 The extending direction of the rotation center line P of the rotor 900 when the stator 100 is relatively rotatable is shown. In addition, the "circumferential direction" refers to the circumferential direction with the rotation center line P as the center when the rotor 900 and the stator 100 are relatively rotatable, as viewed from a right-angle cross section in the axial direction.

[0063] The “radial direction” refers to the direction from the rotation center line P of the rotor 900 to the direction opposite to the rotation center line P (stator outer diameter) or from the opposite side of the rotation center line P (stator outer diameter) of the rotor 900 to the rotation center line P when the rotor 900 and the stator 100 are relatively rotatable, or the direction from the opposite side to the rotation center line P (stator outer diameter) of the rotor 900 to the rotation center line P. The “radially inner peripheral side” refers to the side of the rotation center line P, and the “radially outer peripheral side” refers to the opposite side to the rotation center line P.

[0064] Furthermore, for the interphase insulating paper, the "axial direction", "circumferential direction", "radial direction", "radial inner peripheral side" and "radial outer peripheral side" refer to the same directions as the "axial direction", "circumferential direction", "radial direction", "radial inner peripheral side" and "radial outer peripheral side" when the interphase insulating paper is installed on the stator core.

[0065] Figure 1 A three-dimensional diagram of a stator 100 of a motor provided in an embodiment of the present invention, Figure 2 1 is a plan view of a stator 100 provided in an embodiment of the present invention. The stator 100 comprises a stator core 200 formed by stacking electromagnetic steel plates, a stator winding 300 wound on the stator core 200, Figure 2 The slot insulation paper 400 and the phase insulation paper 500 are roughly constructed.

[0066] like Figure 2 As shown, when viewed from one axial side of the stator core, the stator core 200 has a yoke portion 210 extending in the circumferential direction and a plurality of tooth portions 220 extending in the radial direction.

[0067] The tooth portion 220 includes a tooth bottom portion 221 extending along the radial inner circumference of the yoke portion 210, and a tooth tip portion 222 provided on the radial inner circumference of the tooth bottom portion 221 and extending in the circumferential direction. The tooth tip end surfaces 222a on the radial inner circumference of the plurality of tooth tip portions 222 form the rotor insertion hole 200a. The motor of the present invention, for example, Fig.19 As shown, the rotor 900 is inserted as shown. Figure 1 , Figure 2 When the rotor of the stator 100 is inserted into the hole 200a, it is rotatably supported by a bearing 920 mounted on a bracket 910 with the rotation center line P as the central axis.

[0068] A stator slot 231 is formed between two circumferentially adjacent teeth 220, and the stator winding 300 is inserted into the stator slot 231 through the slot insulation paper 400. The multi-phase (eg, three-phase) winding of the stator winding 300 is inserted into the stator slot 231 in a distributed roll manner.

[0069] The interphase insulating paper 500 is two insulating papers arranged between the different phase windings of the multi-phase (for example, three-phase) stator winding. The two insulating papers are Figure 2 The outer-middle interphase insulation paper 500A is arranged on the radial outer circumference side, and the inner-middle interphase insulation paper 500B is arranged on the radial inner circumference side. Figure 2 In order to simplify the structure of the stator 100, the outer interphase insulation paper 500A and the middle interphase insulation paper 500B are shown in the figure as circles, but in fact they are as follows. Figure 1 As shown, it is inserted between the first phase winding 301, the second phase winding 302, and the third phase winding 303.

[0070] Figure 3 The interphase insulating paper 500 of the present invention is a development diagram of the interphase insulating paper 500 (i.e., the middle and outer interphase insulating paper 500A and the middle interphase insulating paper 500B). The interphase insulating paper 500 of the present invention is made of a material with excellent electrical insulation performance (for example, made of plastic films such as PET, PEN, PPS, DuPont NOMEX and these composite materials), and a plurality of tooth insertion holes 510 can be formed at intervals in the length direction of the insulating sheet by punching a sheet of insulating sheet.

[0071] A connecting portion 520 is formed between adjacent tooth insertion holes 510, and a pair of strip-shaped bodies are left at both ends of the insulating sheet in the width direction, namely, a first strip-shaped body 530 and a second strip-shaped body 540. At least one of the first strip-shaped body 530 and the second strip-shaped body 540 forms a recess 550, and the recess 550 has a first inclined portion 550a and a second inclined portion 550b that are relatively arranged, and a bottom 550c connecting the first inclined portion 550a and the second inclined portion 550b. The first strip-shaped body 530 may have portions where the recess 550 is formed and portions where it is not formed that are staggered. It should be noted here that the portions may be staggered, continuous, or freely set to be continuous and staggered. In addition, Figure 3 Although the recess 550 is formed in the first belt-shaped body 530 , the recess 550 may be formed in the second belt-shaped body 540 , or the recess 550 may be formed in both the first belt-shaped body 530 and the second belt-shaped body 540 .

[0072] Figure 3 In the figure, a first fold 560 is provided on one side of the connecting portion 520 facing the first strip-shaped body 530 and the second strip-shaped body 540, and the first folds 560 on both sides of the connecting portion are folded inward with the same width (almost the same width) as the connecting portion 520, and the narrow part of the first fold 560 is called the first part 580.

[0073] In addition, the first belt-shaped body 530 and the second belt-shaped body 540 sandwiched between the two sides of the tooth insertion hole 510 have two second folds 570 folded outward, and the second folds 570 provided on the first belt-shaped body 530 and the second folds 570 provided on the second belt-shaped body 540 are arranged opposite to each other, and the second folds 570 on the first belt-shaped body 530 can form a pair of folds, and the second folds 570 on the second belt-shaped body 540 can form a pair of folds. The part sandwiched between the pair of second folds 570 is called the second part 590, and the part sandwiched between the first part 580 and the second part 590 is called the third part 600.

[0074] The first portion 580 of the first strip-shaped body 530 is folded and arranged at the innermost side of the insulating paper, and the second portion 590 is folded and arranged at the outermost side of the insulating paper. The first portion 580 and the second portion 590 are connected by the third portion 600 , the first fold 560 and the second fold 570 .

[0075] By forming the first fold 560 and the second fold 570 on the first strip-shaped body 530, the operator does not need to apply any special force. Figure 3 The strip-shaped interphase insulating paper (insulating sheet) 500 shown in FIG. 1 can be transformed into Figure 4 The substantially hollow cylindrical shape shown. Figure 4 Schematic diagram of the first strip-shaped body 530 and the second strip-shaped body 540 of the interphase insulation paper 500 without the recess 550 formed thereon.

[0076] By making the interphase insulating paper 500 into a roughly hollow cylindrical shape, the first strip-shaped body 530 and the second strip-shaped body 540 are curved in a wave shape along the axial direction, the first part 580 forms the outermost edge of the wave shape, and the second part 590 forms the innermost edge of the wave shape. In the state of being deformed into a roughly hollow cylindrical shape, Figure 3 The two ends of the interphase insulating paper 500 formed by one insulating sheet shown in the figure in the length direction can maintain the same insulation even if they are not connected. Figure 4 Thus, even if the step of connecting the two ends of the insulating paper in the length direction can be omitted, in other words, in actual assembly, it is not necessary to connect the two ends of the insulating paper in the length direction, but it is not a problem for the interphase insulating paper 500 of the present invention not to be omitted.

[0077] Next, how the interphase insulating paper 500 of the present invention is installed on the stator core 200 is described. Figure 2 As shown, slot insulation paper 400 is installed in the stator slot 231 of the stator core 200. At this time, in the slot insulation paper 400, Figure 5 The folded portions 400 a at both ends of the axial direction protrude outward from the first stator core end surface 200A and the second stator core end surface 200B.

[0078] Next, the first phase winding 301 is inserted into the stator slot 231 through the slot insulation paper 400. The first phase winding 301 is wound into a series continuous annular winding to span multiple ( Figure 5 The winding 301 is inserted into the stator slot 231 in the manner of three (three) teeth 220. The winding 301 is inserted into the stator slot 231 by a winding insertion machine not shown in the drawings, and the five windings are distributed and wound in the stator slot 231 at intervals of 72 degrees along the circumference of the stator core 200. When the winding 301 is inserted, the folded portion 400a of the slot insulation paper 400 just abuts against the end face 200A of the stator core, which can prevent the position of the slot insulation paper 400 from shifting. In other words, the folded portion 400a of the slot insulation paper 400 can play a role in preventing shifting.

[0079] When the first phase winding 301 is inserted, the winding side of the first phase winding 301 is received in the stator slot 231, and the winding end protrudes outward from the first stator core end face 200A and the second stator core end face 200B. The protruding winding end is extended along the radial outer peripheral side by mechanical forming. Figure 5 The winding ends on both sides protruding from the first stator core end face 200A and the second stator core end face 200B also extend radially outward.

[0080] Next, Figure 4 The middle and outer interphase insulation paper 500A in the state shown is installed on the stator core 200. Figure 4 The substantially hollow cylindrical middle and outer interphase insulating paper 500A is inserted into the rotor insertion hole 200a along the axial direction of the stator core 200 in a state where the inner peripheral side thereof is reduced in diameter in the radial direction.

[0081] Next, by releasing the reduced diameter state of the middle and outer interphase insulating paper 500A inserted into the rotor insertion hole 200a, the connecting portion 520 of the middle and outer interphase insulating paper 500A is installed from the radial inner side into the stator slot 231 without the winding side of the first phase winding 301. Figure 6 As shown, the connection portion 520 is installed in the stator slot 231 that is adjacent to the stator slot 231 with the winding side of the first phase winding 301 in the circumferential direction clockwise. That is, the connection portion 520 of the middle and outer interphase insulating paper 500A also spans multiple ( Figure 5The teeth 220 (three in number) are inserted into the grooves.

[0082] When the middle and outer interphase insulating paper 500A is installed on the stator core 200, the first strip-shaped body 530 and the second strip-shaped body 540 of the middle and outer interphase insulating paper 500A protrude from the two end surfaces 200A and 200B of the stator core 200. Then, the first portions 580 of the first strip-shaped body 530 and the second strip-shaped body 540 are arranged at intervals in the circumferential direction on the radially outer peripheral side extension portion of the first phase winding 301, that is, one first portion 580 is arranged between adjacent radially outer peripheral side extension portions of the first phase winding 301, and the second portion 590 is arranged on a portion that is not extended to the radially outer peripheral side.

[0083] Figure 7 is a plan view of the installation state. Figure 7 As shown, the first part 580 of the first strip-shaped body 530 and the first part 580 of the second strip-shaped body 540 of the middle and outer interphase insulating paper 500A are arranged at a position extending radially outwardly of the first phase winding 301, and on the first stator core end surface 200A of the stator core 200 where there is no first phase winding 301 between adjacent first phase windings 301. The second part 590 of the first strip-shaped body 530 and the second part 590 of the second strip-shaped body 540 are usually arranged at a position where the first phase winding 301 does not extend radially outwardly, and the third part 600 connects the first part 580 and the second part 590.

[0084] The first phase winding 301 and the middle and outer interphase insulating paper 500A are installed on the stator core 200, and then the second phase winding 302 is inserted into the stator slot 231 of the stator core 200. Similarly, the second phase winding 302 is wound into a series continuous annular winding like the first phase winding 301 to span multiple ( Figure 8 The three teeth 220 are wound in the stator slots 231.

[0085] At this time, the second phase winding 302 is distributedly inserted into the stator slot 231 of the stator core 200 provided with the first portion 580 of the middle and outer interphase insulation paper 500A. When the second phase winding 302 is inserted, the folded portion 400a of the slot insulation paper 400 just abuts against the end surface 200A of the stator core 200, which can prevent the slot insulation paper 400 from being offset.

[0086] Inserted into the second phase winding 302 of the stator core 200, as Figure 8As shown in FIG. 2 , the winding edge is received in the stator slot 231, and the winding end protrudes outward from the first stator core end face 200A and the second stator core end face 200B along the axial direction of the stator core 200. The protruding winding end, like the first phase winding 301, is extended toward the radial outer peripheral side by mechanical forming. At this time, the middle and outer layers of interphase insulating paper 500A between the first phase winding 301 and the second phase winding 302 are formed as shown in FIG. Figure 3 The recess 550 shown can prevent the middle and outer layers of interphase insulation paper 500A from protruding radially outward and axially from the winding end of the second phase winding 302 by extending the winding end radially outward and the middle and outer layers of interphase insulation paper 500A also extending radially outward.

[0087] Next, Figure 4 The middle and inner interphase insulating paper 500B shown in the figure is installed on the stator core 200. The middle and inner interphase insulating paper 500B is installed in the same way that it is first reduced in diameter radially inwardly and then inserted into the rotor insertion hole 200a along the axial direction of the stator core 200.

[0088] The inner-phase interphase insulating paper 500B inserted into the rotor insertion hole 200a is released from the reduced diameter state, and its connecting portion 520 is installed from the radial inner circumference into the stator slot 231 on the winding side where the first phase winding 301 and the second phase winding 302 are not accommodated. Fig. 9 As shown, the connecting portion 520 is installed in a stator slot 231 adjacent to the stator slot 231 in the circumferential direction clockwise of the stator slot 231 accommodating the winding side of the second phase winding 302 .

[0089] When the middle inner interphase insulating paper 500B and the first phase winding 301 and the second phase winding 302 are installed on the stator core 200, the first strip body 530 and the second strip body 540 of the middle inner interphase insulating paper 500B protrude from the first stator core end face 200A and the second stator core 200B, respectively. Fig.10 As shown, the first portion 580 of the first strip-shaped body 530 and the first portion 580 of the second strip-shaped body 540 are alternately arranged at positions extending radially outwardly of the first phase winding 301 and the second phase winding 302, and the second portion 590 is arranged at positions not extending radially outwardly of the first phase winding 301 and the second phase winding 302. The third portion 600 connects the first portion 580 and the second portion 590.

[0090] like Figure 7As shown in FIG. 1 , after the first phase winding 301 and the second phase winding 302 and the middle inner phase insulating paper 500B are installed on the stator core 200, the third phase winding 303 is then inserted into the stator slot 231 of the stator core 200. The third phase winding 303 is also wound into a series continuous annular winding like the first phase winding 301 and the second phase winding 302 to span multiple ( Figure 8 The tooth portion 220 is inserted by a winding insertion machine (not shown in the figure) in the manner of 3 (in the middle).

[0091] The third phase winding 303 is inserted in a distributed roll into the stator slot 231 of the stator core 200 installed with the first portion 580 of the middle and inner interphase insulation paper 500B. When the third phase winding 303 is inserted, the folded portion 400a of the slot insulation paper 400 just abuts against the end face 200A of the first stator core, which can prevent the slot insulation paper 400 from being offset.

[0092] Insert the third phase winding 303 of the stator core 200, such as Fig.11 As shown, the winding edges are housed in the stator slots 231, and the winding ends protrude outward from the first stator core end face 200A and the second stator core end face 200B. If only the first phase winding 301, the second phase winding 302, and the third phase winding 303 are inserted, since there is no need to consider the insertability of the next phase winding, unlike the first phase winding 301 and the second phase winding 302, the protruding winding ends do not need to expand radially outward. That is, the winding ends of the third phase winding 303 protrude in an upright manner toward the first stator core end face 200A and the second stator core end face 200B. In addition, since the winding ends of the third phase winding 303 do not need to expand radially outward, the middle and inner layers of the interphase insulating paper 500B do not need to be formed. Figure 3 The recess 550 is formed to prevent the interphase insulating paper from flying out along the radial outer peripheral side and axial direction of the winding end when the winding end is extended radially outward.

[0093] Fig.12 FIG. 3 is a plan view of the first phase winding 301, the second phase winding 302 and the third phase winding 303 installed on the stator core 200. Fig.12 As shown, the middle-inner interphase insulating paper 500B is arranged between the first phase winding 301 and the second phase winding 302 and the third phase winding 303 to electrically insulate each other. The first portion 580 of the middle-inner interphase insulating paper 500B is arranged in the stator slot 231 into which the third phase winding 303 is inserted, and the second portion 590 is arranged between the first phase winding 301 and the second phase winding 302 and at a position where the first phase winding 301 and the second phase winding 302 do not extend radially outward.

[0094] Thus, the middle and outer interphase insulating paper 500A and the middle and inner interphase insulating paper 500B of the present invention are installed on the stator core 200 together with the stator winding 300 (the first phase winding 301, the second phase winding 302 and the third phase winding 303), forming a stator core 200 as shown in FIG. Fig.12 The stator 100 shown in FIG. 1 is a stator 100. At this time, the interphase insulating papers 500A and 500B form a first strip-shaped body 530 and a second strip-shaped body 540 in a wavy shape when viewed from the axial direction, so when the stator winding 300 is inserted into the stator slot 231 of the stator core 200, the middle and outer interphase insulating papers 500A and the middle and inner interphase insulating papers 500B do not hinder the insertion of the winding, thereby improving the working efficiency.

[0095] Fig.12 In the stator 100 shown, the winding ends of the stator winding 300 (i.e., the first phase winding 301, the second phase winding 302, and the third phase winding 303) are mechanically formed, and their axial and radial dimensions can be controlled to be minimum. After mechanical forming, the stator winding 300 (i.e., the first phase winding 301, the second phase winding 302, and the third phase winding 303) are fastened and fixed with binding wires.

[0096] Fig.13 It is a stereoscopic view of the original interphase insulation paper 700 (ie, the original middle and outer layer interphase insulation paper 700A and the original middle and inner layer interphase insulation paper 700B) for comparison with the interphase insulation paper 500 of the present invention (ie, the middle and outer layer interphase insulation paper 500A and the middle and inner layer interphase insulation paper 500B). Fig.13 In the original interphase insulation paper 700 shown in FIG. 1 , a plurality of original tooth insertion holes 710 are formed at intervals in the circumferential direction on the side of the substantially hollow cylindrical insulation sheet. Fig.14 As shown, the original interphase insulating paper 700 is formed by connecting both ends in the length direction of an insulating sheet on which a plurality of original tooth insertion holes 710 are punched and processed.

[0097] A plurality of original tooth insertion holes 710 are formed on the insulating sheet, and a connecting portion 720 is formed between each original tooth insertion hole 710. A pair of original first strip-shaped bodies 730 and original second strip-shaped bodies 740 are formed at both ends in the width direction of the insulating sheet. An original concave portion 750 may be provided on the original first strip-shaped body 730 and the original second strip-shaped body 740. The original concave portion 750 is composed of a pair of original first inclined portions 750a and original second inclined portions 750b, and a bottom edge 750c connecting the original first inclined portions 750a and the original second inclined portions 750b. If the original concave portion 750 is provided, it is also possible to choose to alternately open or not open the original concave portion 750 in the length direction of the original first strip-shaped body 730 and the original second strip-shaped body 740.

[0098] Fig.14 The insulating sheet shown is formed as Fig.13 The substantially hollow cylindrical original interphase insulating paper 700 shown in FIG. Figure 3The interphase insulating paper 500 shown is different in that it does not have the first fold 560 and the second fold 570, so it will not be deformed into Fig.14 The original interphase insulating paper 700 shown in the figure is roughly hollow cylindrical, and needs to be deformed into a roughly hollow cylindrical shape by the operator manually applying force, and the two ends in the width direction are connected to maintain the shape. Fig.13 The roughly hollow cylindrical shape is sufficient. Fig.13 for Fig.14 The interphase insulating paper 700 without the original recessed portion 750 is shown on the original first strip-shaped body 730 and the original second strip-shaped body 740 of the insulating sheet.

[0099] like Fig.13 As shown, the substantially hollow cylindrical original interphase insulating paper 700A is installed on the stator core 200. In addition, before installing the original interphase insulating paper 700A, the first phase winding 301 of the stator winding 300 is inserted into the stator slot 231. The description of the insertion method of the first phase winding 301 and the extension along the radial outer peripheral side is as follows. Figure 5 The same is not introduced here.

[0100] Fig.13 When the original middle and outer layer interphase insulation paper 700A shown is installed on the stator core 200, the roughly hollow cylindrical original middle and outer layer interphase insulation paper 700A that is radially reduced is inserted into the rotor insertion hole 200a of the stator core 200, and then its reduced diameter state is released, and the original connection part 720 of the original middle and outer layer interphase insulation paper 700A is installed in the stator slot 231 of the stator core 200 from the radial inner side.

[0101] Fig.15 The figure shows the middle and outer interphase insulation paper 700A installed on the stator core 200. The original first strip-shaped body 730 and the original second strip-shaped body 740 of the original middle and outer interphase insulation paper 700A protrude axially from the first stator core end face 200A and the second stator core end face 200B. Then, Fig.15 It can be seen that when the second phase winding 302 is inserted, it cannot be inserted into the stator slot 231 of the stator core 200 due to interference with the middle and outer interphase insulation paper 700A.

[0102] Therefore, if Fig.16 As shown, in order to successfully insert the second phase winding 302, a portion of the original first strip-shaped body 730 of the original middle and outer interphase insulating paper 700A installed on the stator core 200 needs to be bent along the radial outer peripheral side. To achieve such bending forming, for example, mechanical forming is required at the same time as the winding, but it is difficult to adjust the degree of deformation by mechanical forming alone, such as Fig.17As shown, it is very likely that the original first strip-shaped body 730 of the middle and outer interphase insulating paper 700A will fly out to the inner diameter side of the stator core 200 (the rotor insertion hole 200a side).

[0103] Once the original middle and outer interphase insulation paper 700A flies into the rotor insertion hole 200a, Fig.16 As shown, when the second phase winding 302 is inserted into the stator core 200, a jig (not shown in the figure) of a winding and insertion machine used in the insertion operation may be interfered with, thereby hindering the insertion operation.

[0104] On the contrary, the interphase insulating paper 500 of the present invention (ie, the middle outer interphase insulating paper 500A and the middle inner interphase insulating paper 500B) is as follows Figure 3 As shown in the figure, the installation position of the first fold 560 and the second fold 570 on the insulating sheet is adjusted and the size of the fold is adjusted. Figure 4 The interphase insulation paper 500 shown in FIG. 1 is relatively easy to bend and can be easily installed on the stator core 200. Fig.18 As shown, the first strip-shaped body 530 of the interphase insulation paper 500 can be effectively prevented from flying into the inner diameter side of the stator core 200 (the rotor insertion hole 200 a side).

[0105] Therefore, when the second phase winding 302 is inserted into the stator core 200, the jig of the winding insertion machine will not be interfered by the interphase insulation paper 500, and the insertion operation can be carried out smoothly.

[0106] As described above, the interphase insulation paper of the present invention has the following advantages: since only a single interphase insulation paper consisting of a single insulation sheet needs to be inserted into the stator, the assembly efficiency is improved compared with the conventional method of inserting multiple interphase insulation papers. In addition, when the stator winding is inserted into the stator core, the single interphase insulation paper is not easily misplaced or wound.

[0107] Furthermore, because the interphase insulating paper is axially corrugated before being inserted into the stator winding, it is easier to adjust the bending portion of the interphase insulating paper according to the target size and shape than to allow it to become corrugated after insertion, thereby preventing the first strip-shaped body 530 and the second strip-shaped body 540 from protruding toward one side of the rotor insertion hole 200a, thereby allowing the stator winding insertion operation to proceed smoothly.

[0108] Moreover, by providing folds on the strip portion of an insulating sheet to form the interphase insulating paper 500, operators can easily deform it into a roughly hollow cylindrical shape without applying manual force, and there is no need to connect the two ends of an insulating sheet in the length direction, thereby reducing the burden of the molding operation.

[0109] In addition, the interphase insulating paper 500 forms a bend axially toward the radial outer peripheral side, which can effectively avoid contact between the stator winding 300 and the interphase insulating paper 500 when the stator winding 300 is inserted into the stator core 200, thereby preventing the interphase insulating paper 500 from being dislocated and entangled.

[0110] In addition, the present invention also provides a stator, including a stator winding 300, interphase insulation paper and a stator core 200, the stator core 200 including a circumferentially extending yoke 210, and a plurality of tooth portions 220 arranged on the inner circumferential side of the yoke 210 and spaced apart along the radial inner circumferential side, the stator winding 300 is inserted into a stator slot 231 formed by a plurality of tooth portions 220, the interphase insulation paper is installed between different phases of the stator winding 300, and the interphase insulation paper is the interphase insulation paper 500 of any of the above-mentioned schemes.

[0111] In addition, the present invention further provides an electric motor, comprising a rotor and the above-mentioned stator 100 , wherein the rotor 900 and the stator 100 are rotatably arranged relative to each other.

[0112] Since the interphase insulation paper is provided as above, the interphase insulation paper is not easily displaced or entangled, so the stator 100 and the motor can maintain good product quality.

[0113] It should be noted that the interphase insulating paper can also be used on stators with out-of-phase windings.

[0114] In addition, the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An interphase insulating paper, arranged between stator windings of different phases, characterized in that: The interphase insulating paper includes a pair of oppositely arranged strip-shaped bodies and a plurality of connecting parts. The strip-shaped body is at least partially arranged between the winding ends of the stator winding. The winding ends of the stator winding are protruded from the axial ends of the stator core. The plurality of connecting parts are arranged in the stator slots of the stator core and connected to the strip-shaped body. Before the strip-shaped body is inserted into the stator winding, the interphase insulating paper forms a wavy fold when viewed axially in the state of being installed in the stator core.

2. The interphase insulating paper according to claim 1, characterized in that: The interphase paper is bent to form a generally hollow cylindrical structure.

3. The interphase insulating paper according to claim 1 or 2, characterized in that: The strip-shaped body forms a wave-shaped fold when viewed in the axial direction when mounted on the stator core, and forms a curved portion toward the radially outer peripheral side of the stator core when viewed in the axial direction of the stator core.

4. The interphase insulating paper according to claim 1, characterized in that: The wave-shaped fold is at least arranged between adjacent connecting portions.

5. The interphase insulating paper according to claim 4, characterized in that: At least a portion of the wave-shaped fold coincides with a side edge of the connecting portion.

6. The interphase insulating paper according to claim 1, characterized in that: At least one of the strip-shaped bodies is provided with a groove, and along the axial direction of the stator core, the groove is arranged in the same direction as the winding end of the stator winding.

7. The interphase insulating paper according to claim 6, characterized in that: The grooves are arranged at intervals along the length direction of the strip-shaped body; Alternatively, the grooves are continuously arranged along the length direction of the strip-shaped body.

8. The interphase insulating paper according to claim 1, characterized in that: The interphase insulating paper is an integrally formed paper.

9. A stator, characterized in that: It includes a stator winding, interphase insulation paper and a stator core, wherein the stator core includes a circumferentially extending yoke and a plurality of teeth extending from the yoke along the radial inner circumference, the stator winding is inserted into a stator slot formed by the plurality of teeth, the interphase insulation paper is installed between different phases of the stator winding, and the interphase insulation paper is the interphase insulation paper according to any one of claims 1 to 8.

10. An electric motor, characterized in that: The invention comprises a rotor and the stator as claimed in claim 9, wherein the rotor and the stator are rotatably arranged relative to each other.

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