TW202418717A - Insulation Paper - Google Patents

Abstract

The insulating paper disclosed herein is an insulating paper for insulating the different phases at the ends of the coils of the stator core of the motor, and has an upper edge located on the upper side, a lower edge located on the lower side, a left edge connecting the left end of the upper edge and the left end of the lower edge, and a right edge connecting the right end of the upper edge and the right end of the lower edge. The upper edge bulges upward as the left and right ends approach each other. The lower edge has a first edge extending from the left edge to the right, and a second edge inclined upward and connected to the right edge as the right end of the first edge moves toward the right. The angle formed between the lower edge and the left edge is a sharp angle.

Description

Insulation Paper

Invention Field

The present disclosure relates to an insulating paper for insulating different phases at the ends of a coil of a motor.

Invention Background

Generally speaking, in motors, insulating paper is used to insulate the ends of coils of different phases. The insulating paper is inserted between the ends of the coils where they touch each other. By inserting the insulating paper between the ends of the coils, the withstand voltage can be improved. In the past, various proposals have been made for insulating paper used in motors. For example, in order to insulate different phases at the ends of the coils, two types of insulating paper of different shapes are sometimes used. Prior art literature Patent literature

[Patent Document 1] Japanese Patent Application Publication No. 2004-112974

Invention Summary Problem to be solved by the invention

When two types of insulating paper are used, one of the insulating papers is inserted between the ends of the coils, and then the other insulating paper is inserted between the ends of the coils, which requires labor and time. When two types of insulating paper are used, there is a possibility that one or both of the insulating papers are not properly arranged when the two types of insulating paper are inserted between the ends of the coils, and the entire portion to be insulated cannot be insulated in a complementary manner. When two types of insulating paper are used, when the two types of insulating paper are inserted between the ends of the coils, it is difficult to visually confirm whether the insulating portion is properly insulated because the two types of insulating paper overlap each other.

Usually, if the size requirements of the coil ends of the motor are more stringent, a correction step will be performed during its manufacturing. The aforementioned correction step is to correct the shape of the coil ends by applying pressure or hitting the coil ends strongly. After the correction step, the coils at the coil ends will be firmly and tightly connected to each other and it is not convenient to insert the insulating paper. Therefore, the insertion of the insulating paper is performed before the correction step. When the correction step is performed, two types of insulating paper have been inserted between the coil ends. In order to insulate the insulating part, the two types of insulating paper are inserted between the coil ends in a greatly bent state. If the insulating paper inserted between the ends of the coil is greatly bent, there is a high possibility that the insulating paper will shift during the correction step as the coil deforms and moves. In this case, one or both of the two types of insulating paper will shift from the correct position, and there is a possibility that the insulating point cannot be insulated.

Therefore, after the correction step, a confirmation step is performed to confirm whether the insulating portion is properly insulated. When two types of insulating paper are used, it is difficult to visually confirm whether the ends of the coils are insulated as described above. Therefore, the confirmation step requires labor and time. After the confirmation step, a position correction step is performed to correct the positions of the two types of insulating paper in the portion that is not properly insulated. In the position correction step, since the positions of the two types of insulating paper need to be corrected, the correction requires labor and time.

There have been various problems in the past. Therefore, in order to eliminate these problems, an insulating paper is desired that can be easily inserted between the ends of the coils of different phases, and the position can be adjusted when it is inserted between the ends of the coils, and it is easy to understand from the appearance whether the insulation is done well. Means for solving the problem

The insulating paper disclosed herein is an insulating paper for insulating the different phases at the ends of the coils of the stator core of the motor, and has an upper edge located on the upper side, a lower edge located on the lower side, a left edge connecting the left end of the upper edge and the left end of the lower edge, and a right edge connecting the right end of the upper edge and the right end of the lower edge. The upper edge bulges upward as the left and right ends approach each other. The lower edge has a first edge extending from the left edge toward the right, and a second edge inclined upward and connected to the right edge as the right end of the first edge moves toward the right. The angle formed between the lower edge and the left edge is a sharp angle.

The form used to implement the invention

The following reference drawings are used to illustrate an insulating paper of one embodiment of the present disclosure. Referring to Figures 1 to 5, the insulating paper 1 of the first embodiment is described. The insulating paper 1 is used to insulate the different phases of the coil ends 4 of the coil 3 provided in the stator core 2 of the motor. Here, the "insulation" mentioned in this application means electrical insulation. The material of the insulating paper 1 is not particularly limited as long as it can insulate 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 has an upper edge 5 located on the upper side, a lower edge 6 located on the lower side, a left edge 7 connecting the left end of the upper edge 5 and the left end of the lower edge 6, and a right edge 8 connecting the right end of the upper edge 5 and the right end of the lower edge 6.

The upper side portion 5 bulges upward as the left and right ends approach each other. In the example shown in the figure, the upper side portion 5 is in the shape of a curve that bulges upward in an arc shape. The upper side portion 5 connects the upper end of the left side portion 7 and the upper end of the right side portion 8. That is, the left end of the upper side portion 5 is connected to the upper end of the left side portion 7 (the connection between the upper side portion 5 and the left side portion 7 is indicated by the symbol 28), and the right end of the upper side portion 5 is connected to the upper end of the right side portion 8 (the connection between the upper side portion 5 and the right side portion 8 is indicated by the symbol 29). In the example shown in the figure, the upper end of the left side portion 7 (connection 28) is located above the upper end of the right side portion 8 (connection 29).

The lower side portion 6 has a straight first side portion 9 and a straight second side portion 10. The first side portion 9 extends from the lower end of the left side portion 7 toward the right. That is, the left end of the first side portion 9 is connected to the lower end of the left side portion 7 (the corner where the first side portion 9 and the left side portion 7 are connected is represented by the symbol 18). In the example shown in the figure, the first side portion 9 extends from the left side portion 7 toward the right in a horizontal direction. The second side portion 10 is inclined upward as it moves from the right end of the first side portion 9 toward the right. The second side 10 connects the right end of the first side portion 9 and the lower end of the right side portion 8. That is, the left end of the second side 10 is connected to the right end of the first side 9 (the corner where the first side 9 and the second side 10 are connected is indicated by symbol 27), and the right end of the second side 10 is connected to the lower end of the right side 8 (the corner where the second side 10 and the right side 8 are connected is indicated by symbol 21). The length of the second side 10 is shorter than the length of the first side 9.

The left side 7 is in a straight line shape. The upper end of the left side 7 is connected to the left end of the upper side 5, and the lower end of the left side 7 is connected to the left end of the first side 9. The left side 7 is inclined toward the right as it moves upward from the left end of the first side 9. Specifically, the angle α formed between the first side 9 of the lower side 6 and the left side 7 is an acute angle.

The right side 8 is in a straight line shape. The upper end of the right side 8 is connected to the right end of the upper side 5, and the lower end of the right side 8 is connected to the right end of the second side 10. The right side 8 is inclined toward the left as it moves upward from the right end of the second side 10.

Furthermore, 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 straight lines, and may be partially or entirely curved. That is, in the present application, the "side" of 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 straight lines, curved lines, and both.

The insulating paper 1 having such a structure is inserted between the ends 4 and 4 of the coils of different phases. As shown in Fig. 2, Fig. 3 and Fig. 5, the stator 11 is used together with a rotor (not shown) in an electric motor for supplying power to a rotating machine. The stator 11 has a cylindrical stator core 2 and a plurality of coils 3 provided on the stator core 2.

The stator core 2 is cylindrical with both ends in the axial direction opened, and is made of a magnetic material. The stator core 2 has a plurality of slots 12. The plurality of slots 12 are arranged on the inner side of the stator core 2 in a circumferential direction of the stator core 2.

A plurality of coils 3 are inserted into the slots 12 of the stator core 2. Each coil 3 protrudes outward from one end surface in the axial direction of the stator core 2 and protrudes outward from the other end surface in the axial direction of the stator core 2 when inserted into the slots 12. In this way, the coil 3 has coil ends 4 protruding outward from both end surfaces in the axial direction of the stator core 2.

In the example shown in the figure, coils 3 of three phases, namely, U phase, V phase, and W phase, are inserted into the slots 12 of the stator core 2. For example, the coils 3 of three phases are inserted into the slots 12 in such a manner that the coils 3 of different phases are arranged every three slots. In such a case where one phase is formed by every three slots, the coil ends 4, 4 of different phases are formed similarly every six slots, and thus the ends 4, 4 of the coils are crossed with each other. Therefore, for the convenience of explanation, the six-slot portion of the stator core 2 is shown in FIG. 2, FIG. 3, and FIG. 5.

In the portion where the coil ends 4, 4 of different phases intersect each other, the insulating paper 1 is inserted between the outer coil end 4a and the inner coil end 4b. The insulating paper 1 is appropriately bent along the outer shapes of the outer coil end 4a and the inner coil end 4b while being arranged between the outer coil end 4a and the inner coil end 4b. As shown in FIG. 4 , the insulating paper 1 is bent at the first bending position 13, the second bending position 14, the third bending position 15, the fourth bending position 16, and the fifth bending position 17.

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

The fourth bending position 16 is located between the first bending position 13 and the third bending position 15. The fourth bending position 16 extends in a manner inclined to the right as it goes upward. The fifth bending position 17 is located between the first bending position 13 and the third bending position 15. The fifth bending position 17 is located to the left of the fourth bending position 16. The fifth bending position 17 extends in a manner inclined to the right as it goes upward.

The portion between the first bending position 13 and the upper edge 5 is defined as the first region 19, and the first region 19 has the upper edge 5. The portion between the second bending position 14 and the right edge 8 is defined as the second region 20, and since the second bending position 14 reaches the second edge 10, the second region 20 has a corner 21 between the right edge 8 and the second edge 10. The second region 20 is connected to the first region 19. The portion surrounded by the third bending position 15, the left edge 7, and the first edge 9 is defined as the third region 22, and 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.

As shown in Fig. 2, Fig. 3 and Fig. 5, the first region 19 is bent toward the outside of the stator core 2 along the upper portion of the outer coil end 4a when the insulating paper 1 is arranged between the inner coil end 4b and the outer coil end 4a. The second region 20 is bent toward the outside of the stator core 2 along the root portion of the outer coil end 4a when the insulating paper 1 is arranged between the inner coil end 4b and the outer coil end 4a. The third region 22 is bent toward the outside of the stator core 2 along the lower portion of the outer coil end 4a and the root portion of the outer coil end 4a when the insulating paper 1 is arranged between the inner coil end 4b and the outer coil end 4a. The front end of the bent third region 22 is inserted into the outer coil end 4a. Since the outer coil end 4a is composed of a plurality of windings, the front end of the third region 22 can be inserted into the outer coil end 4a.

The first bending position 13, the second bending position 14, and the third bending position 15 are formed by bending the insulating paper 1 along the outer shape of the coil end 4a on the outer side. That is, the first bending position 13, the second bending position 14, and the third bending position 15 are not formed on the insulating paper 1 in advance, but are formed by bending the insulating paper 1 along the coil end 4a on the outer side.

Furthermore, 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 example shown in the figure, the second region 20 is bent along the root portion of the coil end 4a standing upright from the groove 12 at one end of the three grooves, and the third region 22 is bent along the root portion of the coil end 4a standing upright from the groove 12 at the other end of the three grooves.

In this way, the insulating paper 1 wraps around the outer coil end 4a from the upper right part of the outer coil end 4a, and wraps around the outer coil end 4a from the lower left part of the outer coil end 4a. In this way, the insulating paper 1 is arranged between the outer coil end 4a and the inner coil end 4b in a manner of sandwiching the outer coil end 4a. Therefore, the insulating paper 1 is unlikely to be offset relative to the outer coil end 4a and the inner coil end 4b in an insulating state. After the insulating paper 1 is arranged to insulate the outer coil end 4a and the inner coil end 4b, the front end of the third area 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.

In a state where the outer coil end 4a is wrapped with the insulating paper 1, the insulating paper 1 is bent toward the inner side of the stator core 2 in a manner along the outer shape of the inner coil end 4b. By bending the insulating paper 1 toward the inner side of the stator core 2, the fourth bending position 16 and the fifth bending position 17 are formed. That is, the fourth bending position 16 and the fifth bending position 17 are not formed on the insulating paper 1 in advance, but are formed by bending the insulating paper 1 along the inner coil end 4b.

By wrapping the outer coil end 4a with the insulating paper 1, the insulated portion can be insulated. As shown in FIG5, the insulating portions are the first insulating portion 23, the second insulating portion 24, and the third insulating portion 25. The first insulating portion 23 is between the root portion of one end side of the outer coil end 4a in the width direction and the root portion of the adjacent coil end 4. The second insulating portion 24 is between the root portion of the other end side of the outer coil end 4a in the width direction and the root portion of the adjacent coil end 4. The third insulating portion 25 is the portion where the outer coil end 4a intersects with the inner coil end 4b.

The first insulating portion 23 can be insulated because the lower portion of the right end of the insulating paper 1 can wrap the root portion of the outer coil end 4a when the second region 20 is folded. The second insulating portion 24 can be insulated because the lower portion of the insulating paper 1 can wrap the root portion of the outer coil end 4a when the third region 22 is folded. The third insulating portion 25 can be insulated because it is covered by the upper left portion of the insulating paper 1. When the third insulating portion 25 is to be insulated, the right side portion of the first area 19 is folded in a manner corresponding to the corner 26 of the third insulating portion 25, so that the insulating paper 1 can follow the shape of the third insulating portion 25. In addition, 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, by bending the first area 19 along the outer coil end 4a, a curved first bending position 13 can be formed. That is, the first area 19 is bent along the first bending position 13. The distance between the upper edge 5 of the first area 19 and the first bending position 13 is long enough to cover the outer coil end 4a with the first area 19. In this case, by making the upper edge 5 into an arc shape, the distance between the upper edge 5 and the first bending position 13 can be ensured, and the distance between the upper edge 5 and the first bending position 13 can be shortened. Thus, when the first area 19 is bent, the first area 19 can be prevented from being bent. Therefore, according to the first embodiment, the insulating paper 1 has an arc shape with the upper edge 5 along the first bending position 13, so the first area 19 is easily bent along the outer coil end 4a.

In the case of the insulating paper 1 of the first embodiment, the insulating paper 1 is bent inward along the inner coil end 4b to form the fourth bending position 16. That is, the insulating paper 1 is bent along the fourth bending position 16. In the case of the insulating paper 1 of the first embodiment, the second bending position 14 is formed by bending the second area 20 along the outer coil end 4a. That is, the second area 20 is bent along the second bending position 14. The insulating paper 1 is bent inward along the fourth bending position 16 and the second region 20 is bent outward along the second bending position 14, whereby the corner 21 between the right side 8 and the second side 10 is located below compared to before the insulating paper 1 is bent.

A comparative example is described in which the lower edge of the insulating paper is assumed to be in a straight line. In this case, if the insulating paper is bent inward along the fourth bending position and the second region is bent outward along the second bending position, the corner between the right edge and the lower edge is located further downward than when the insulating paper has the second edge. Therefore, in the case of the insulating paper of the comparative example, when the insulating paper is insulated between the outer coil end 4a and the inner coil end 4b, the corner between the right edge and the lower edge contacts the stator core 2. In the insulating paper of the comparative example, since the corner between the right side and the lower side contacts the stator core 2, the root side of the outer coil end 4a cannot be pulled in.

In contrast, the insulating paper 1 of the first embodiment has the second side 10, so the above problem is less likely to occur. Thus, in the case of the insulating paper 1 of the first embodiment, the corner 21 between the right side 8 and the second side 10 can be pulled into the root side of the outer coil end 4a. Therefore, according to the insulating paper 1 of the first embodiment, the root portion of the outer coil end 4a can be fully insulated.

In the case of the insulating paper 1 of the first embodiment, in the portion between the second bending position 14 and the right side 8, the distance between the second bending position 14 and the right side 8 is longer than the distance between the first bending position 13 and the upper side 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 root portion of the outer coil end 4a can be fully protected. According to the insulating paper 1 of the first embodiment, since the width of 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 of the second embodiment of the present invention is described using FIG. 6. In addition, regarding the components having the same symbols as those of the first embodiment, since their functions are the same, the description thereof is sometimes omitted below. The insulating paper 1a of the second embodiment is different from the first embodiment in that the insulating paper 1a is curved as a whole.

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. The "R-shape" mentioned in this application means a shape with an arc because the outline is composed of a curve. When the corner 18 between the left side 7 and the first side 9 is R-shaped, the angle of 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 28 between the left side 7 and the upper side 5 is in the shape of a curve bulging outward. Thereby, the left side 7 and the upper side 5 are smoothly connected. The connection 29 between the right side 8 and the upper side 5 is in the shape of a curve bulging outward. Thereby, the right side 8 is smoothly connected to the upper side 5. Therefore, according to the insulating paper 1a of the second embodiment, the insulating paper 1a can be miniaturized.

Next, the insulating paper of the third embodiment of the present invention is described using FIG. 7. In addition, regarding the components having the same symbols as those of the first embodiment, since their functions are the same, the description thereof is sometimes omitted below. The insulating paper 1b of the third embodiment is different from the first embodiment in that the configuration of the third area 22 thereof is different.

The insulating paper 1b has a suppression portion 30, which can suppress the displacement of the third area 22 in the state of being inserted into the outer coil end 4a. In the illustrated example, the suppression portion 30 is roughly triangular and is provided on the left side 7 and the first side 9. The suppression portion 30 provided on the left side 7 protrudes outward from the left side 7. The suppression portion 30 provided on the first side 9 protrudes outward from the first side 9. Due to such a structure, when the third area 22 is inserted into the outer coil end 4a, the suppression portion 30 will hook the winding and is difficult to deviate. Therefore, according to the insulating paper 1b of the third embodiment, the posture of the insulating state can be more reliably maintained.

Next, the insulating paper of the fourth embodiment of the present invention is described using FIG8. In addition, regarding the components having the same symbols as those of the first embodiment, since their functions are the same, the description thereof is sometimes omitted below. The insulating paper 1c of the fourth embodiment is different from the first embodiment in the structure of the lower side portion.

In the insulating paper 1c, the left edge 7 and the first edge 9 are connected by the straight first inclined edge 31. The first inclined edge 31 is inclined toward the left as it goes upward from the first edge 9. The lower end of the first inclined edge 31 is connected to the left end of the first edge 9. The upper end of the first inclined edge 31 is connected to the lower end of the left edge 7. The angle of the portion where the extension line of the left edge 7 and the extension line of the first edge 9 intersect is α. In the insulating paper 1c, the right edge 8 and the second edge 10 are connected by the straight second inclined edge 32. The second inclined edge 32 is inclined toward the right as it goes upward from the second edge 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.

Due to such a structure, after the insulating paper 1c is installed on the stator core 2, it is not necessary to cut off the front end of the third area 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 installing the insulating paper 1c on the stator core 2.

Next, the insulating paper of the fifth embodiment of the present invention is described using FIG. 9. In addition, regarding the components having the same symbols as those of the first embodiment, since their functions are the same, the description thereof is sometimes omitted below. The insulating paper 1d of the fifth embodiment is different from the first embodiment in that it has a limiting portion 33 for limiting the deviation of the posture from the insulating state.

The limiting portion 33 has an engaged portion 34 and an engaging portion 35 that can be loaded and unloaded on the engaged portion 34. The engaged portion 34 is provided at the right side portion of the first area 19. The engaged portion 34 is a through hole that passes through the front-rear direction (thickness direction). The engaging portion 35 is provided at the first side 9. The engaging portion 35 has a protruding piece 36 protruding outward from the first side 9, and an inserting piece 37 provided at the front end of the protruding piece 36. The inserting piece 37 has recesses 38 at both ends in the width direction. The width direction refers to a direction perpendicular to the direction in which the protruding piece 36 protrudes.

Due to such a configuration, when the insulating paper 1d has wrapped 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 has been inserted into the engaged portion 34, the side wall of one side of the recess 38 of the insertion piece 37 contacts the back side of the insulating paper 1d, thereby preventing the engaging portion 35 from being separated from the engaged portion 34.

In the case of the insulating paper 1d of the fifth embodiment, the insulating paper 1d is restricted from deviating from the state of wrapping the outer coil end 4a due to the restriction portion 33. Therefore, according to the insulating paper 1d of the fifth embodiment, the insulating state can be more reliably maintained.

According to at least one embodiment described above, the coil ends 4, 4 can be insulated from each other by the above-mentioned one sheet of insulating paper 1. Therefore, the insulating paper 1 can be provided: the insertion operation between the coil ends 4, 4 of different phases can be easily performed, and the position adjustment can be performed when the insulating paper 1 is inserted between the coil ends 4, 4, and whether the insulation is completed can be easily understood from the appearance.

Although the present disclosure has been described in detail, the present disclosure is not limited to the above-mentioned embodiments. Such embodiments may be subject to various additions, replacements, changes, or deletions of parts without departing from the gist of the present disclosure or the purpose of the present disclosure derived from the contents described in the patent application and its equivalents. Furthermore, such embodiments may also be implemented in combination. For example, in the above-mentioned embodiments, the sequence of actions or the sequence of processing are shown as an example and are not limited to such sequences. Furthermore, the same is true if numerical values or formulas are used in the description of the above-mentioned embodiments.

The following notes are further disclosed with respect to the above-mentioned embodiment. (Note 1) The insulating paper (1) is an insulating paper for insulating the different phases of the coil ends (4) of the coil (3) provided in the stator core (2) of the motor, and has an upper edge portion (5) located on the upper side, a lower edge portion (6) located on the lower side, a left edge portion (7) connecting the left end of the upper edge portion (5) and the left end of the lower edge portion (6), and a right edge portion (8) connecting the right end of the upper edge portion (5) and the right end of the lower edge portion (6). The upper edge portion (5) bulges upward as it moves from the left and right ends toward each other. The lower edge (6) has a first edge (9) extending from the left edge (7) toward the right, and a second edge (10) that is inclined upward as it moves toward the right from the right end of the first edge (9) and is connected to the right edge (8). The angle (α) formed between the lower edge (6) and the left edge (7) is an acute angle. (Note 2) The insulating paper (1) preferably has: a first region (19) having the upper edge (5). The first region (19) is bent outward along the upper portion of the outer coil end (4a) when the insulating paper (1) is arranged between the inner coil end (4b) and the outer coil end (4a). (Note 3) The insulating paper (1) preferably has: a second area (20) having a corner (21) between the right side (8) and the second side (10) and connected to the first area (19). The second area (20) is bent outward along the root portion of the outer coil end (4a) when the insulating paper (1) is arranged between the inner coil end (4b) and the outer coil end (4a). (Note 4) The insulating paper (1) preferably has: a third area (22) having a corner (18) between the left side (7) and the first side (9). The third area (22) is bent outward along the lower part of the outer coil end (4a) and the root part of the outer coil end (4a) when the insulating paper (1) is arranged between the inner coil end (4b) and the outer coil end (4a). The front end of the bent third area (22) is inserted into the outer coil end (4a).

1,1a,1b,1c,1d: Insulation 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: 1st side 10: 2nd side 11: Stator 12: Slot 13: 1st bend position 14: 2nd bend position 15: 3rd bend position 16: 4th bend position 17: 5th bend position 18,21,27: Corner 19: 1st area 20: 2nd area 22: 3rd area 23: 1st insulation area 24: Second insulating portion 25: Third insulating portion 26: Corner 28,29: Connection 30: Suppression portion 31: First inclined edge 32: Second inclined edge 33: Limiting portion 34: Engaged portion 35: Engaging portion 36: Protruding piece 37: Inserting piece 38: Recessed portion α: Angle

FIG. 1 is a front view of the insulating paper of the first embodiment of the present invention. FIG. 2 is a schematic three-dimensional view showing the use state of the insulating paper of the first embodiment of the present invention, and shows the state viewed from the outside of the stator. FIG. 3 is a schematic three-dimensional view showing the use state of the insulating paper of the first embodiment of the present invention, and shows the state viewed from the inside of the stator. FIG. 4 is a front view of the insulating paper of the first embodiment of the present invention, and shows the bending position when the insulating paper is used. FIG. 5 is a schematic three-dimensional view showing the use state of the insulating paper of the first embodiment of the present invention, and shows the positional relationship between the insulating paper and the insulating portion. FIG. 6 is a front view of the insulating paper of the second embodiment of the present invention. FIG. 7 is a front view of the insulating paper of the third embodiment of the present invention. FIG. 8 is a front view of the insulating paper of the fourth embodiment of the present invention. FIG. 9 is a front view of the insulating paper of the fifth embodiment of the present invention.

1: Insulation paper

5: Upper side

6: Lower part

7: Left side

8: Right side

9: 1st side

10: Second side

18,21,27: Corners

28,29: Connection point

α: angle

Claims (4)

An insulating paper is used to insulate the different phases of the ends of the coils of the stator core of the motor, and comprises: an upper edge located on the upper side; a lower edge located on the lower side; a left edge connecting the left end of the upper edge and the left end of the lower edge; and a right edge connecting the right end of the upper edge and the right end of the lower edge, the upper edge bulges upward as the left and right ends approach each other, the lower edge has a first edge extending from the left edge toward the right, and a second edge inclined upward and connected to the right edge as the right end of the first edge moves toward the right, the angle formed between the lower edge and the left edge is a sharp angle. The insulating paper of claim 1 comprises: a first region having the upper edge, wherein the first region is bent outward along the upper portion of the outer coil end when the insulating paper is disposed between the inner coil end and the outer coil end. The insulating paper of claim 2 comprises: a second area having a corner between the right side and the second side and connected to the first area, and the second area is bent outward along the root portion of the outer coil end when the insulating paper is arranged between the inner coil end and the outer coil end. The insulating paper of claim 2 or 3 comprises: a third area having a corner between the left side and the first side, the third area is bent outward along the lower part of the outer coil end and the root part of the outer coil end when the insulating paper is arranged between the inner coil end and the outer coil end, the front end of the bent third area is inserted into the outer coil end.

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