WO2024084585A1

WO2024084585A1 - Insulating paper

Info

Publication number: WO2024084585A1
Application number: PCT/JP2022/038784
Authority: WO
Inventors: 悠太近藤
Original assignee: ファナック株式会社
Priority date: 2022-10-18
Filing date: 2022-10-18
Publication date: 2024-04-25
Also published as: JP7273256B1

Abstract

This insulating paper insulates between different phases of coil ends of coils provided to a stator core of an electric motor, the insulating paper comprising an upper side part positioned on the upper side, a lower side part positioned on the lower side, a left side part that connects the left end of the upper side part and the left end of the lower side part, and a right side part that connects the right end of the upper side part and the right end of the lower side part. The upper side part bulges upward to a greater extent with progression in a direction mutually approaching from both the left and right end parts. The lower side part has a first side part that extends rightward from the left side part, and a second side part that inclines upward to a greater extent with progression rightward from the right end of the first side part and is connected to the right side part. The angle formed between the lower side part and the left side part is acute.

Description

Insulating paper

This disclosure relates to insulating paper that provides insulation between different phases of the coil ends of an electric motor.

In general, insulating paper is used in electric motors to provide insulation between coil ends of different phases. The insulating paper is inserted between the coil ends where they come into contact. By inserting insulating paper between the coil ends, the withstand voltage can be increased. Various types of insulating paper have been proposed for use in electric motors. For example, two types of insulating paper with different shapes may be used to provide insulation between the coil ends of different phases.

JP 2004-112974 A

When using two types of insulating paper, one type of insulating paper must be inserted between the coil ends before the other type, which takes time and effort. When using two types of insulating paper, if one or both types of insulating paper are not positioned properly when the two types of insulating paper are inserted between the coil ends, it may not be possible to insulate the entire area that requires complementary insulation. When using two types of insulating paper, the two types of insulating paper overlap when inserted between the coil ends, making it difficult to visually check whether the areas that require insulation are properly insulated.

Usually, when the dimensional requirements for the coil ends of an electric motor are strict, a correction process is carried out during manufacturing to correct the coil end shape by pressing or hard hitting the coil ends. After this correction process, the coils in the coil ends are tightly and firmly attached to each other, making it difficult to insert insulating paper, so the insulating paper is inserted prior to the correction process. When the correction process is carried out, two types of insulating paper are inserted between the coil ends. The two types of insulating paper are inserted between the coil ends in a significantly bent state so that the insulating parts can be insulated. If the insulating paper inserted between the coil ends is significantly bent, there is a high possibility that the insulating paper will shift as the coil deforms and moves during the correction process. In this case, there is a risk that one or both of the two types of insulating paper will shift from the correct position, causing a problem in which the insulating parts cannot be insulated.

For this reason, after the correction process, a verification process is carried out to check whether the insulated areas are properly insulated. When two types of insulating paper are used, as mentioned above, it is difficult to visually check whether the coil ends are insulated. Therefore, the verification process requires time and effort. After the verification process, a position correction process is carried out to correct the positions of the two types of insulating paper in areas that are not properly insulated. In the position correction process, the positions of the two types of insulating paper are corrected, so the correction requires time and effort.

As described above, there have been various problems in the past. Therefore, in order to solve these problems, there is a need for insulating paper that can be easily inserted between the coil ends of different phases, and that can be easily adjusted in position when inserted between the coil ends, and that makes it easy to tell from the outside whether insulation is achieved or not.

The insulating paper disclosed herein is an insulating paper that insulates between different phases of the coil ends of a coil provided in the stator core of an electric motor, and includes an upper edge portion located on the upper side, a lower edge portion located on the lower side, a left edge portion connecting the left end of the upper edge portion with the left end of the lower edge portion, and a right edge portion connecting the right end of the upper edge portion with the right end of the lower edge portion. The upper edge portion bulges upward as it approaches each of the left and right ends. The lower edge portion has a first edge portion extending to the right from the left edge portion, and a second edge portion that is inclined upward as it approaches the right end of the first edge portion and is connected to the right edge portion. The angle between the lower edge portion and the left edge portion is an acute angle.

FIG. 2 is a front view showing the insulating paper according to the first embodiment of the present invention. 1 is a schematic perspective view showing a state in which insulating paper according to a first embodiment of the present invention is used, as viewed from the outside of a stator. FIG. 1 is a schematic perspective view showing a state in which insulating paper according to a first embodiment of the present invention is used, as viewed from inside a stator. FIG. FIG. 2 is a front view showing the insulating paper according to the first embodiment of the present invention, illustrating the folding position when the insulating paper is used. FIG. 2 is a schematic perspective view showing a state in which the insulating paper according to the first embodiment of the present invention is used, illustrating the positional relationship between the insulating paper and an insulating portion. FIG. 6 is a front view showing an insulating paper according to a second embodiment of the present invention. FIG. 11 is a front view showing an insulating paper according to a third embodiment of the present invention. FIG. 11 is a front view showing an insulating paper according to a fourth embodiment of the present invention. FIG. 13 is a front view showing an insulating paper according to a fifth embodiment of the present invention.

Below, an insulating paper according to one aspect of the present disclosure will be described with reference to the drawings. An insulating paper 1 according to a first embodiment will be described with reference to Figs. 1 to 5. The insulating paper 1 insulates between different phases of the coil ends 4 of the coils 3 provided in the stator core 2 of the electric motor. Here, "insulation" in this application means electrical insulation. There are no particular limitations on the material of the insulating paper 1 as long as it is a material that can insulate between the

coil ends

4, 4 of different phases. As shown in Fig. 1, the insulating paper 1 is in the form of a sheet, and includes an upper side portion 5 located on the upper side, a lower side portion 6 located on the lower side, a left side portion 7 connecting the left end of the upper side portion 5 and the left end of the lower side portion 6, and a right side portion 8 connecting the right end of the upper side portion 5 and the right end of the lower side portion 6.

The upper edge portion 5 bulges upward as it approaches both the left and right ends. In the illustrated example, the upper edge portion 5 is curved and bulges upward in an arc shape. The upper edge portion 5 connects the upper end of the left edge portion 7 to the upper end of the right edge portion 8. That is, the left end of the upper edge portion 5 is connected to the upper end of the left edge portion 7 (the connection point between the upper edge portion 5 and the left edge portion 7 is indicated by the reference symbol 28), and the right end of the upper edge portion 5 is connected to the upper end of the right edge portion 8 (the connection point between the upper edge portion 5 and the right edge portion 8 is indicated by the reference symbol 29). In the illustrated example, the upper end of the left edge portion 7 (connection point 28) is located higher than the upper end of the right edge portion 8 (connection point 29).

The bottom edge 6 has a linear first edge 9 and a linear second edge 10. The first edge 9 extends to the right from the lower end of the left edge 7. That is, the left end of the first edge 9 is connected to the lower end of the left edge 7 (the corner where the first edge 9 and the left edge 7 are connected is indicated by the symbol 18). In the illustrated example, the first edge 9 extends to the right from the left edge 7 along the horizontal direction. The second edge 10 slopes upward as it moves from the right end of the first edge 9 to the right. The second edge 10 connects the right end of the first edge 9 to the lower end of the right edge 8. That is, the left end of the second side portion 10 is connected to the right end of the first side portion 9 (the corner where the first side portion 9 and the second side portion 10 are connected is indicated by the reference symbol 27), and the right end of the second side portion 10 is connected to the lower end of the right side portion 8 (the corner where the second side portion 10 and the right side portion 8 are connected is indicated by the reference symbol 21). The length of the second side portion 10 is shorter than the length of the first side portion 9.

The left side portion 7 is linear. The upper end of the left side portion 7 is connected to the left end of the upper side portion 5, and the lower end of the left side portion 7 is connected to the left end of the first side portion 9. The left side portion 7 slopes to the right as it moves upward from the left end of the first side portion 9. Specifically, the angle α between the first side portion 9 of the lower side portion 6 and the left side portion 7 is an acute angle.

The right side portion 8 is linear. The upper end of the right side portion 8 is connected to the right end of the upper side portion 5, and the lower end of the right side portion 8 is connected to the right end of the second side portion 10. The right side portion 8 slopes leftward as it moves upward from the right end of the second side portion 10.

Note that the first side 9 of the lower side 6, the second side 10 of the lower side 6, the left side 7, and the right side 8 are not limited to being straight, and may be partially or entirely curved. That is, in this application, the term "side" in relation to the first side 9 of the lower side 6, the second side 10 of the lower side 6, the left side 7, and the right side 8 includes cases where the side is straight, curved, and both.

The insulating paper 1 configured in this manner is inserted between the coil ends 4, 4 of different phases. As shown in Figures 2, 3, and 5, the stator 11 is used together with a rotor (not shown) in an electric motor that powers a rotating device. The stator 11 has a cylindrical stator core 2 and a number of coils 3 provided on the stator core 2.

The stator core 2 is cylindrical with both axial ends open, and is made of a magnetic material. The stator core 2 has a number of slots 12. The slots 12 are arranged in a line on the inside of the stator core 2 in the circumferential direction of the stator core 2.

Multiple coils 3 are inserted into the slots 12 of the stator core 2. When inserted into the slots 12, each coil 3 protrudes outward from one axial end face of the stator core 2 and also protrudes outward from the other axial end face of the stator core 2. In this way, the coils 3 have coil ends 4 that protrude outward from both end faces of the stator core 2 in the axial direction.

In the illustrated example, three-phase coils 3, U-phase, V-phase, and W-phase, are inserted into the slots 12 of the stator core 2. For example, the three-phase coils 3 are inserted into the slots 12 so that coils 3 of different phases are arranged every third slot. When one phase is configured with three slots in this manner, coil ends 4, 4 of different phases cross each other in the same manner every sixth slot. Therefore, for ease of explanation, a six-slot portion of the stator core 2 is shown in Figures 2, 3, and 5.

In the area where the coil ends 4, 4 of different phases intersect, the insulating paper 1 is inserted between the outer coil end 4a and the inner coil end 4b. When the insulating paper 1 is disposed between the outer coil end 4a and the inner coil end 4b, it is folded appropriately to follow the external shapes of the outer coil end 4a and the inner coil end 4b. As shown in FIG. 4, the insulating paper 1 is folded at a first folding position 13, a second folding position 14, a third folding position 15, a fourth folding position 16, and a fifth folding position 17.

The first folding position 13 is located at a distance from the upper side portion 5. The first folding position 13 is approximately curved along the upper side portion 5. That is, in the portion between the first folding position 13 and the upper side portion 5, the distance between the first folding position 13 and the upper side portion 5 is approximately equal. The second folding position 14 is located at a distance from the right side portion 8. The second folding position 14 is smoothly continuous with the first folding position 13. The second folding position 14 extends from the first folding position 13 to the second side portion 10 of the lower side portion 6. In the portion between the second folding position 14 and the right side portion 8, the distance between the second folding position 14 and the right side portion 8 is longer than the distance between the first folding position 13 and the upper side portion 5. The third folding position 15 is located at a distance from the corner 18 between the left side portion 7 and the first side portion 9 of the lower side portion 6. The third folding position 15 extends to connect the left side portion 7 and the first side portion 9. The portion surrounded by the third folding position 15, the left side portion 7, and the first side portion 9 is substantially triangular.

The fourth folding position 16 is located between the first folding position 13 and the third folding position 15. The fourth folding position 16 extends so as to tilt to the right as it goes upward. The fifth folding position 17 is located between the first folding position 13 and the third folding position 15. The fifth folding position 17 is located to the left of the fourth folding position 16. The fifth folding position 17 extends so as to tilt to the right as it goes upward.

If the portion between the first folding position 13 and the upper edge 5 is defined as a first region 19, the first region 19 has the upper edge 5. If the portion between the second folding position 14 and the right edge 8 is defined as a second region 20, the second region 20 has a corner 21 between the right edge 8 and the second edge 10 because the second folding position 14 reaches the second edge 10. The second region 20 is continuous with the first region 19. If the portion surrounded by the third folding position 15, the left edge 7, and the first edge 9 is defined as a third region 22, the third region 22 has a corner 18 between the left edge 7 and the first edge 9. In this way, the insulating paper 1 has the first region 19, the second region 20, and the third region 22.

2, 3 and 5, the first region 19 is folded outside the stator core 2 along the upper part of the outer coil end 4a with the insulating paper 1 arranged between the inner coil end 4b and the outer coil end 4a. The second region 20 is folded outside the stator core 2 along the root part of the outer coil end 4a with the insulating paper 1 arranged between the inner coil end 4b and the outer coil end 4a. The third region 22 is folded outside the stator core 2 along the lower part of the outer coil end 4a and the root part of the outer coil end 4a with the insulating paper 1 arranged between the inner coil end 4b and the outer coil end 4a. The tip of the folded third region 22 is inserted into the outer coil end 4a. Since the outer coil end 4a is composed of multiple windings, the tip of the third region 22 can be inserted into the outer coil end 4a.

The first folding position 13, the second folding position 14, and the third folding position 15 are formed by folding the insulating paper 1 along the outer shape of the outer coil end 4a. In other words, the first folding position 13, the second folding position 14, and the third folding position 15 are not pre-formed in the insulating paper 1, but are formed by folding the insulating paper 1 along the outer coil end 4a.

The root portion of the coil end 4a along which the third region 22 is bent is on the opposite side to the root portion of the coil end 4a along which the second region 20 is bent. In the illustrated example, the second region 20 is bent along the root portion of the coil end 4a rising from the slot 12 at one end of the three slots, and the third region 22 is bent along the root portion of the coil end 4a rising from the slot 12 at the other end of the three slots.

In this way, the insulating paper 1 wraps around the outer coil end 4a from the upper right portion of the outer coil end 4a, and wraps around the outer coil end 4a from the lower left portion of the outer coil end 4a. As a result, the insulating paper 1 is arranged between the outer coil end 4a and the inner coil end 4b, sandwiching the outer coil end 4a. Therefore, the insulating paper 1 is unlikely to shift relative to the outer coil end 4a and the inner coil end 4b in an insulated state. After the insulating paper 1 is arranged to insulate between the outer coil end 4a and the inner coil end 4b, the tip of the third region 22 inserted into the outer coil end 4a and the corner 21 between the right side 8 and the second side 10 are cut off.

When the insulating paper 1 is wrapped around the outer coil end 4a, the insulating paper 1 is folded inside the stator core 2 so as to follow the outer shape of the inner coil end 4b. By folding the insulating paper 1 inside the stator core 2, a fourth folding position 16 and a fifth folding position 17 are formed. In other words, the fourth folding position 16 and the fifth folding position 17 are not pre-formed in the insulating paper 1, but are formed by folding the insulating paper 1 along the inner coil end 4b.

By wrapping the outer coil end 4a with insulating paper 1, the areas that need to be insulated can be insulated. As shown in FIG. 5, the insulated areas are a first insulated area 23, a second insulated area 24, and a third insulated area 25. The first insulated area 23 is between the root portion on one widthwise end side of the outer coil end 4a and the root portion of the adjacent coil end 4. The second insulated area 24 is between the root portion on the other widthwise end side of the outer coil end 4a and the root portion of the adjacent coil end 4. The third insulated area 25 is the area where the outer coil end 4a and the inner coil end 4b intersect.

The first insulating portion 23 can be insulated because the root portion of the outer coil end 4a is wrapped by the lower part of the right end of the insulating paper 1 when the second region 20 is folded. The second insulating portion 24 can be insulated because the root portion of the outer coil end 4a is wrapped by the lower part of the insulating paper 1 when the third region 22 is folded. The third insulating portion 25 can be insulated because it is covered by the upper left part of the insulating paper 1. When insulating the third insulating portion 25, the right part of the first region 19 can be folded to correspond to the corner 26 of the third insulating portion 25, so that the insulating paper 1 can be made to conform to the shape of the third insulating portion 25. Also, the insulating paper 1 can be pulled into the root portion of the outer coil end 4a.

In the case of the insulating paper 1 of the first embodiment, the first region 19 is folded along the outer coil end 4a to form a curved first folding position 13. That is, the first region 19 is folded along the first folding position 13. The distance between the upper edge portion 5 of the first region 19 and the first folding position 13 is long enough to cover the outer coil end 4a with the first region 19. In this case, by making the upper edge portion 5 into an arc shape, the distance between the upper edge portion 5 and the first folding position 13 can be shortened while ensuring the distance between the upper edge portion 5 and the first folding position 13. This makes it possible to suppress bending of the first region 19 when the first region 19 is folded. Therefore, according to the insulating paper 1 of the first embodiment, since the upper edge portion 5 is arc-shaped along the first folding position 13, it is easy to fold the first region 19 along the outer coil end 4a.

In the case of the insulating paper 1 of the first embodiment, the insulating paper 1 is folded inward along the inner coil end 4b to form the fourth folding position 16. That is, the insulating paper 1 is folded along the fourth folding position 16. In the case of the insulating paper 1 of the first embodiment, the second folding position 14 is formed by folding the second region 20 along the outer coil end 4a. That is, the second region 20 is folded along the second folding position 14. As the insulating paper 1 is folded inward along the fourth folding position 16 and the second region 20 is folded outward along the second folding position 14, the corner 21 between the right side portion 8 and the second side portion 10 is positioned lower compared to before the insulating paper 1 is folded.

We will now explain a comparative example in which the bottom edge of the insulating paper is straight. In this case, when the insulating paper is folded inward along the fourth folding position and the second region is folded outward along the second folding position, the corner between the right edge and the bottom edge is located further down compared to when the insulating paper has a second edge. Therefore, in the case of the insulating paper of the comparative example, the corner between the right edge and the bottom edge comes into contact with the stator core 2 when the insulating paper insulates between the outer coil end 4a and the inner coil end 4b. In the insulating paper of the comparative example, the corner between the right edge and the bottom edge comes into contact with the stator core 2, and therefore cannot be pulled in toward the base of the outer coil end 4a.

In contrast, the insulating paper 1 of the first embodiment has the second side portion 10, so the above-mentioned problem is less likely to occur. As a result, in the case of the insulating paper 1 of the first embodiment, the corner portion 21 between the right side portion 8 and the second side portion 10 can be pulled toward the root side of the outer coil end 4a. Therefore, with the insulating paper 1 of the first embodiment, the root portion of the outer coil end 4a can be sufficiently insulated.

In the case of the insulating paper 1 of the first embodiment, in the portion between the second folding position 14 and the right edge portion 8, the distance between the second folding position 14 and the right edge portion 8 is longer than the distance between the first folding position 13 and the upper edge portion 5. That is, the width of the second region 20 is wider than the width of the first region 19. Therefore, according to the insulating paper 1 of the first embodiment, the base portion of the outer coil end 4a can be adequately protected. According to the insulating paper 1 of the first embodiment, since the second region 20 is wider than the first region 19, it is easy to grasp when used as a handle when inserting the insulating paper 1 between the outer coil end 4a and the inner coil end 4b.

Next, the insulating paper according to the second embodiment of the present invention will be described with reference to FIG. 6. Note that components having the same reference numerals as those in the first embodiment have the same functions, and therefore their description may be omitted below. The insulating paper 1a of the second embodiment differs from the first embodiment in that it has an overall rounded shape.

In the insulating paper 1a, the corner 18 between the left side 7 and the first side 9 is R-shaped. The corner 27 between the first side 9 and the second side 10 is R-shaped. The corner 21 between the second side 10 and the right side 8 is R-shaped. In this application, "R-shaped" means that the contour is composed of a curve, resulting in a rounded shape. When the corner 18 between the left side 7 and the first side 9 is R-shaped, the angle at the part where the extension line of the left side 7 and the extension line of the first side 9 intersect is α. In the insulating paper 1a, the connection point 28 between the left side 7 and the upper side 5 is a curved shape that bulges outward. As a result, the left side 7 and the upper side 5 are smoothly continuous. The connection point 29 between the right side 8 and the upper side 5 is a curved shape that bulges outward. As a result, the right side 8 and the upper side 5 are smoothly continuous. Therefore, with the insulating paper 1a of the second embodiment, it is possible to make the insulating paper 1a more compact.

Next, the insulating paper according to the third embodiment of the present invention will be described with reference to FIG. 7. Note that components having the same reference numerals as those in the first embodiment have the same functions, and therefore their description may be omitted below. The insulating paper 1b of the third embodiment differs from the first embodiment in the configuration of the third region 22.

The insulating paper 1b has a suppression portion 30 that can suppress the third region 22 from shifting when inserted into the outer coil end 4a. In the illustrated example, the suppression portion 30 is approximately triangular and is provided on the left side portion 7 and the first side portion 9. The suppression portion 30 provided on the left side portion 7 protrudes outward from the left side portion 7. The suppression portion 30 provided on the first side portion 9 protrudes outward from the first side portion 9. With this configuration, when the third region 22 is inserted into the outer coil end 4a, the suppression portion 30 gets caught on the winding, so it is difficult for it to shift. Therefore, according to the insulating paper 1b of the third embodiment, the insulating state can be more reliably maintained.

Next, the insulating paper according to the fourth embodiment of the present invention will be described with reference to FIG. 8. Note that components having the same reference numerals as those in the first embodiment have the same functions, and therefore their description may be omitted below. The insulating paper 1c of the fourth embodiment differs from the first embodiment in the configuration of its lower portion.

In the insulating paper 1c, the left side portion 7 and the first side portion 9 are connected via a linear first inclined side portion 31. The first inclined side portion 31 inclines leftward as it moves upward from the first side portion 9. The lower end of the first inclined side portion 31 is connected to the left end of the first side portion 9. The upper end of the first inclined side portion 31 is connected to the lower end of the left side portion 7. The angle at the intersection between the extension line of the left side portion 7 and the extension line of the first side portion 9 is α. In the insulating paper 1c, the right side portion 8 and the second side portion 10 are connected via a linear second inclined side portion 32. The second inclined side portion 32 inclines rightward as it moves upward from the second side portion 10. The lower end of the second inclined side portion 32 is connected to the right end of the second side portion 10. The upper end of the second inclined side portion 32 is connected to the lower end of the right side portion 8.

Because of this configuration, after the insulating paper 1c is attached to the stator core 2, there is no need to cut off the tip of the third region 22 and the corner 21 between the right side 8 and the second side 10. Therefore, according to the insulating paper 1c of the fourth embodiment, it is possible to improve the workability when attaching the insulating paper 1c to the stator core 2.

Next, the insulating paper according to the fifth embodiment of the present invention will be described with reference to FIG. 9. Note that components having the same reference numerals as those in the first embodiment have the same functions, and therefore their description may be omitted below. The insulating paper 1d of the fifth embodiment differs from the first embodiment in that it has a restricting portion 33 that restricts deviation from the insulating state.

The regulating portion 33 has an engaged portion 34 and an engaging portion 35 that is detachable from the engaged portion 34. The engaged portion 34 is provided on the right side portion of the first region 19. The engaged portion 34 is a through hole that penetrates in the front-to-rear direction (thickness direction). The engaging portion 35 is provided on the first side portion 9. The engaging portion 35 has a protruding piece 36 that protrudes outward from the first side portion 9, and an insertion piece 37 that is provided at the tip of the protruding piece 36. The insertion piece 37 has recesses 38 at both ends in the width direction. The width direction is the direction perpendicular to the direction in which the protruding piece 36 protrudes.

With this configuration, when the insulating paper 1d encases the outer coil end 4a, the engaging portion 35 is engaged with the engaged portion 34 by inserting the insertion piece 37 of the engaging portion 35 into the engaged portion 34. When the insertion piece 37 is inserted into the engaged portion 34, one side wall of the recess 38 of the insertion piece 37 comes into contact with the back surface of the insulating paper 1d, preventing the engaging portion 35 from coming off the engaged portion 34.

In the case of the insulating paper 1d of the fifth embodiment, since it has a restricting portion 33, it is possible to restrict the insulating paper 1d from shifting from the state in which it wraps around the outer coil end 4a. Therefore, with the insulating paper 1d of the fifth embodiment, it is possible to more reliably maintain the insulating state.

According to at least one of the embodiments described above, the coil ends 4, 4 can be insulated from each other with a single sheet of insulating paper 1 having the above-described configuration. Therefore, it is possible to provide insulating paper 1 that can be easily inserted between the coil ends 4, 4 of different phases and that can easily adjust the position when inserted between the coil ends 4, 4, and that makes it easy to tell from the outside whether or not insulation is achieved.

Although the present disclosure has been described in detail, the present disclosure is not limited to the individual embodiments described above. Various additions, substitutions, modifications, partial deletions, etc. are possible to these embodiments without departing from the gist of the present disclosure, or without departing from the spirit of the present disclosure derived from the contents described in the claims and their equivalents. These embodiments can also be implemented in combination. For example, in the above-mentioned embodiments, the order of each operation and the order of each process are shown as examples, and are not limited to these. The same applies when numerical values or formulas are used to explain the above-mentioned embodiments.

The following supplementary notes are further disclosed regarding the above embodiment.
(Appendix 1)
The insulating paper (1) is an insulating paper that insulates between different phases of the coil ends (4) of the coils (3) provided in the stator core (2) of an electric motor, and includes an upper side portion (5) located on the upper side, a lower side portion (6) located on the lower side, a left side portion (7) connecting the left end of the upper side portion (5) and the left end of the lower side portion (6), and a right side portion (8) connecting the right end of the upper side portion (5) and the right end of the lower side portion (6). The upper side portion (5) bulges upward as it approaches each other from both the left and right ends. The lower side portion (6) has a first side portion (9) extending to the right from the left side portion (7), and a second side portion (10) that is inclined upward as it approaches the right end of the first side portion (9) and is connected to the right side portion (8). The angle (α) between the lower side portion (6) and the left side portion (7) is an acute angle.
(Appendix 2)
The insulating paper (1) preferably has a first region (19) having the upper side portion (5). The first region (19) is folded outward along an upper portion of the outer coil end (4a) with the insulating paper (1) disposed between the inner coil end (4b) and the outer coil end (4a).
(Appendix 3)
The insulating paper (1) preferably has a corner (21) between the right side portion (8) and the second side portion (10) and includes a second region (20) that is continuous with the first region (19). The second region (20) is folded outward along a root portion of the outer coil end (4a) with the insulating paper (1) disposed between the inner coil end (4b) and the outer coil end (4a).
(Appendix 4)
The insulating paper (1) preferably includes a third region (22) having a corner (18) between the left side portion (7) and the first side portion (9). The third region (22) is folded outward along a lower portion of the outer coil end (4a) and a root portion of the outer coil end (4a) with the insulating paper (1) disposed between the inner coil end (4b) and the outer coil end (4a). The tip of the folded third region (22) is inserted into the outer coil end (4a).

REFERENCE SIGNS LIST 1 insulating paper 2 stator core 3 coil 4 coil end 4a outer coil end 4b inner coil end 5 upper side 6 lower side 7 left side 8 right side 9 first side 10 second side 18 corner 19 first region 20 second region 21 corner 22 third region α angle

Claims

An insulating paper for insulating different phases of a coil end of a coil provided in a stator core of an electric motor,
An upper side portion located on the upper side;
A lower side portion located on the lower side;
a left side portion connecting the left end of the upper side portion and the left end of the lower side portion;
a right side portion connecting the right end of the upper side portion and the right end of the lower side portion,
The upper side portion bulges upward from both left and right ends in a direction toward each other,
the lower side portion has a first side portion extending rightward from the left side portion, and a second side portion inclined upward as it goes rightward from the right end of the first side portion and is connected to the right side portion,
The insulating paper, wherein the angle between the lower side portion and the left side portion is an acute angle.
a first region having the upper side portion;
The insulating paper according to claim 1 , wherein the first region is folded outward along an upper portion of the outer coil end with the insulating paper disposed between an inner coil end and an outer coil end.
a second region having a corner between the right side portion and the second side portion and continuous with the first region;
The insulating paper according to claim 2 , wherein the second region is folded outward along a root portion of the outer coil end with the insulating paper disposed between the inner coil end and the outer coil end.
a third region having a corner portion between the left side portion and the first side portion;
the third region is folded outward along a lower portion of the outer coil end and a root portion of the outer coil end with the insulating paper disposed between the inner coil end and the outer coil end,
The insulating paper according to claim 2 or 3, wherein a tip end of the folded third region is inserted into the outer coil end.