stata

Abstract

To provide a stator that can prevent damage to the insulating paper during coil assembly. [Solution] The stator 1 comprises a stator core 20 having a plurality of slots 25, insulating paper 10, and a coil 30. The inner wall of the slot 25 has an outer wall 27 that extends circumferentially on the radially outer side of the stator core 20, and a pair of side walls 26, 26 that are formed along the radial direction of the stator core 20 and face each other via the outer wall 27. The coil 30 has a rectangular cross-section and a plurality of planar portions 32 that intersect the cross-section. The insulating paper 10 has at least one stretchable portion 15 that can be stretched in a direction intersecting the axial direction of the stator core 20 when inserted into the slot 25, and the stretchable portion 15 is provided at any position on the side of the paper facing at least one of the plurality of planar portions 32 in the coil 30.

Description

Technical Field

[0001] The present invention relates to a stator such as a motor.

Background Art

[0002] Conventionally, when manufacturing a stator of a motor, a coil is assembled to a stator core. The assembly of the coil to the stator core is performed by inserting insulating paper into each of a plurality of slots formed in the stator core and inserting the coil into the insulating paper (for example, Patent Document 1). When the coil is inserted into the insulating paper inserted into the slot, torsion (bending) is applied to the terminals of the coil, and the winding direction of the coil is adjusted.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, the slots and insulating paper of the stator core are formed in a substantially U-shape in a cross-sectional view. Also, the terminals of the coil inserted into the insulating paper in the slot are, for example, twisted in the circumferential direction of the stator core. However, in a stator according to the prior art like the stator described in Patent Document 1, when twisting the terminals of the coil, the terminals of the coil contact the insulating paper, and there is a problem that the insulating paper is pulled in the twisting direction of the coil (for example, the circumferential direction of the stator core). As a result, stress concentrates at the corners of the U-shaped portion in the cross-sectional view of the insulating paper, and there is a problem that the insulating paper is pulled and torn.

[0005] Therefore, the present invention aims to provide a stator that can suppress damage to the insulating paper (insulating material) when assembling the coil to the stator core. Furthermore, the present invention aims to provide a stator that can reduce costs. [Means for solving the problem]

[0006] (1) The present invention, provided to solve the above-mentioned problems, is a stator comprising: a stator core having a plurality of slots; insulating paper inserted into the plurality of slots; and coils inserted into the plurality of slots via the insulating paper, wherein the inner walls of the slots have an outer wall that extends circumferentially on the radially outer side of the stator core, and a pair of side walls formed along the radial direction of the stator core and facing each other via the outer wall; the coils have a rectangular cross-section and a plurality of planar portions that intersect the cross-section; and the insulating paper, when inserted into the slots, has at least one stretchable portion that can be stretched in a direction intersecting the axial direction of the stator core, and the stretchable portion is provided at any position on the paper surface facing at least one of the plurality of planar portions of the coil.

[0007] As described above, the stator of the present invention is equipped with an expandable portion that allows the insulating paper to stretch in a direction intersecting the axial direction of the stator core (for example, along either of the pair of side walls and outer walls in the slot), so that the load (stress) such as tension applied to the insulating paper can be relieved through the expandable portion. Furthermore, since the expandable portion of the stator of the present invention is provided at one of the positions on the paper surface (insulating paper) facing the planar portion of the coil, even if the planar portion of the coil comes into contact with the insulating paper due to the twisting of the coil, the expanding portion stretches the insulating paper in a direction intersecting the axial direction of the stator core. As a result, the stator of the present invention can suppress damage to the insulating paper (especially the corners of the insulating paper) due to stress, and thus maintain the insulating performance of the insulating paper. In addition, since the expandable portion of the stator of the present invention ensures the elongation allowance of the insulating paper, the height of the twisting (bending) initiation point in the height direction of the coil can be lowered. In other words, in the stator of the present invention, the stress caused by the stretching of the insulating paper is relieved by the stretched portion, so the height of the coil twisting start point can be lowered, and damage to the insulating paper can be suppressed even when the twist angle is strong. As a result, the stator of the present invention can reduce the vertical length of the insulating paper and the length of the coil, so cost reduction can be expected.

[0008] (2) The stator of the present invention described above is characterized in that the extended portion is provided at a position facing at least one of the pair of side walls and the outer wall.

[0009] As described above, the stator of the present invention, when configured as described in (2) above, allows the insulating paper to be stretched along the pair of side walls and outer wall. This allows the stator of the present invention to relieve the load on the insulating paper by the stretched portion, even when the coil is twisted with the coil terminals inserted into the insulating paper. Therefore, the stator of the present invention can suppress damage to the insulating paper.

[0010] (3) In the stator of the present invention as described above, the extension portion is provided only on the side of the coil that is in the twisting direction of the coil, out of the two sides of the insulating paper that are opposite to the pair of side walls of the slot.

[0011] As described above, the stator of the present invention, when configured as in (3) above, limits the location where the extended portion is formed to only the side of the coil in the twisting direction, thereby reducing the processing costs of insulating paper and coils.

[0012] (4) In the stator of the present invention as described above, the extension portion is preferably provided on a surface facing the outer wall of the slot and at a position facing at least one of the pair of corners formed by the outer wall and the pair of side walls.

[0013] As described above, the stator of the present invention, when configured as described in (4) above, can directly relieve the stress applied around the corners (folded corners) of the insulating paper. Therefore, the stator of the present invention can more effectively suppress damage to the corners of the insulating paper.

[0014] (5) In the stator of the present invention as described above, the insulating paper is formed to extend from one end to the other in the axial direction of the slot, and the extended portion is formed to extend from one end to the other in the axial direction of the slot.

[0015] As described above, the stator of the present invention, when configured as described in (5) above, allows the stretched portion of the insulating paper to be formed to be long along the axial direction of the slot. Therefore, the stator of the present invention can secure a wide range of stretch for the insulating paper, and thus more reliably suppress damage to the insulating paper when it comes into contact with the coil.

[0016] (6) In the stator of the present invention as described above, the insulating paper is formed to extend from one end to the other end in the axial direction of the slot, the coil is formed to protrude from one end to the other end of the slot and is twisted, and the extended portion is formed on at least a part of the insulating paper from one end to the other end.

[0017] As described above, the stator of the present invention, when configured as in (6) above, can reduce the area where the stretched portion is formed in the insulating paper. This is expected to reduce the cost of forming the insulating paper.

[0018] (7) In the stator of the present invention described above, the stretched portion is preferably characterized in that the cross-section is formed as a triangular, square, or arc-shaped fold.

[0019] The stator of the present invention described above, when configured as in (7) above, can easily secure elongation in the stretched portion. That is, when the fold in the stretched portion of the stator of the present invention is straightened, the fold allowance portion of the fold is stretched, so that the fold allowance portion can be secured as elongation for the insulating paper.

[0020] (8) In the stator of the present invention described above, the insulating paper is preferably formed to extend from one end in the axial direction of the slot to the other end, and is provided with a protruding portion that protrudes outward in the axial direction from one end in the axial direction of the slot.

[0021] As described above, the stator of the present invention, when configured as described in (8) above, allows the stretched portion of the insulating paper to act as an elongation allowance and the protruding portion to act as an opening allowance when the coil is twisted (bent), thereby more effectively suppressing damage to the insulating paper. [Effects of the Invention]

[0022] According to the present invention, it is possible to provide a stator that can suppress damage to an insulating paper (insulating member) when the coil is assembled to the stator core. Further, according to the present invention, it is possible to provide a stator capable of cost reduction.

Brief Description of the Drawings

[0023] [Figure 1] It is a perspective view of a stator according to an embodiment of the present invention. [Figure 2] It is a perspective view of a stator core and an insulating paper used for the stator according to an embodiment of the present invention. [Figure 3] It is a schematic perspective view of an insulating paper incorporated in the stator according to an embodiment of the present invention. [Figure 4] It is an explanatory diagram of the planar direction when a coil is incorporated into the stator according to an embodiment of the present invention. [Figure 5] It is a continued explanatory diagram of the planar direction of FIG. 4. [Figure 6] In FIG. 4, it is an explanatory diagram when the terminal of the coil is twisted, and it also explains the effect achieved by the stator of the present invention. [Figure 7] (a) is an enlarged plan view of the extension portion of the insulating paper in FIG. 3, and (b) and (c) are modified examples of the extension portion of the insulating paper used for the stator of the present invention. [Figure 8] It is an explanatory diagram of the planar direction according to the first modified example of the present invention. [Figure 9] It is an explanatory diagram of the planar direction according to the second modified example of the present invention.

Mode for Carrying Out the Invention

[0024] Hereinafter, the stator 1 according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that each figure is schematically shown for easy understanding, and it should be noted that it may be different from the actual shape, size, and arrangement of components. Further, in the following description, the direction passing through the axis of the stator core 20 will be described as the axial direction (vertical direction). Also, the reference numerals of the same members and the like may be omitted in each figure.

[0025] As shown in Figures 1 and 2, the stator 1 comprises a stator core 20, insulating paper 10, coils 30 (see Figure 1), etc. Furthermore, as shown in Figure 1, the stator 1 is formed by assembling the insulating paper 10 (also referred to as insulating member 10) and coils 30 into the slots 25 of the stator core 20.

[0026] As shown in Figure 2, the stator core 20 is formed in an annular shape, and multiple mounting flange portions 23 are provided on the outer circumference of the partition wall 22. Multiple slots 25 are formed radially (in the radial direction) on the inner circumference of the partition wall 22 of the stator core 20.

[0027] The slots 25 are formed in a groove shape at predetermined intervals across the vertical direction of the partition wall 22. The inner wall of the slot 25 comprises an outer wall 27 that extends circumferentially on the radially outer side of the stator core 20, and a pair of side walls 26, 26 that are formed along the radial direction of the stator core 20 and face each other via the outer wall 27. Insulating paper 10 is inserted into each slot 25 using an appropriate mechanism (not shown). A coil 30 (terminals 31 of the coil 30, see Figure 1) is also inserted into each slot 25 via the insulating paper 10.

[0028] As shown in Figure 1, the coil 30 (terminal 31) has a rectangular cross-section and is equipped with a plurality of planar portions 32 (four in this embodiment) that intersect the cross-section. The coil 30 is inserted into each slot 25 from the lower side of the stator core 20 via insulating paper 10, which will be described later. After the terminal 31 of the coil 30 is inserted into the slot 25, a twist is applied to the portion that protrudes from the upper end. That is, the upper end portion of the terminal 31 that protrudes from the slot 25 is bent in the circumferential direction of the stator core 20 in this embodiment. In this embodiment, the coil 30 is provided with a pair of adjacent terminals 31, 31 that are welded to each other, and a terminal row 31A is formed in the radial direction by arranging three pairs of terminals 31, 31 in the radial direction. Furthermore, a large number of terminal rows 31A are arranged radially. In addition, in this embodiment, a pair of terminals 31, 31 are twisted in opposite directions (both sides in the circumferential direction of the stator core 20). In other words, the pair of terminals 31, 31 are twisted so that they are staggered.

[0029] Next, we will describe the details of the insulating paper 10. Unless otherwise specified, the following description assumes that the insulating paper 10 is inserted into the slot 25.

[0030] As shown in Figure 3, the insulating paper 10 is formed by folding and bending a sheet material, which is formed to extend along the axial direction (up and down direction) of the slot 25, into a pentagonal prism shape along the axial direction. The insulating paper 10 has an insulating paper opening 12 formed by opening the apex corner portion facing radially inward from the slot 25. The insulating paper 10 is formed from, for example, insulating paper, resin, rubber, etc. In this embodiment, the insulating paper 10 has a lower end located at the lower end of the slot 25 and an upper end that protrudes from the upper end of the slot 25, with a protruding portion 16 (shown above the dashed line) extending from the upper end of the slot 25. The protruding portion 16 is intended to insulate the upper end of the slot 25.

[0031] When inserted into the slot 25 (see Figure 4), the insulating paper 10 includes a pair of first paper surfaces 13, 13 (also referred to as first surfaces 13, 13) that spread along the radial direction of the stator core 20, a second paper surface 14 (also referred to as second surface 14) located at the rear end side of the first paper surfaces 13, 13 (outside the radial direction of the stator core 20) in a direction intersecting the first paper surfaces 13, 13 (in this embodiment, a direction perpendicular to the first paper surfaces 13, 13), and a pair of corners 11, 11 (also referred to as folded corners 11, 11) formed at the intersection of the first paper surfaces 13, 13 and the second paper surface 14.

[0032] As shown in Figure 4, the first sheets 13, 13 are positioned with a gap (for example, 3 to 3.5 mm) between them and are arranged to face the side walls 26, 26 of the slot 25. Multiple extended portions 15 are formed on the first sheets 13, 13 by forming multiple rows of folds at intervals along the axial direction of the stator core 20. In this embodiment, three extended portions 15, 15, 15 (a total of six) are formed on each of the first sheets 13, 13. Since the three extended portions 15, 15, 15 have the same configuration, unless there is a need to distinguish between them, any one of the extended portions 15 will be described below.

[0033] The extension portion 15 is provided on the side (in this embodiment, the position opposite to the planar portion 32) of at least one of the multiple planar portions 32 of the coil 30 in the first paper planes 13, 13. In this embodiment, the extension portion 15 is formed as a triangular fold in cross-sectional view, as shown in Figure 7(a). Therefore, the extension portion 15 is designed to extend in a direction intersecting the axial direction of the stator core 20 (in this embodiment, a direction perpendicular to the horizontal direction with respect to the axial direction). In this embodiment, each extension portion 15 in the first paper planes 13, 13 is designed to extend along the side walls 26, 26 of the slot 25, as shown in Figure 5. That is, the extension portion 15 can expand and contract in a direction intersecting the axial direction of the stator core 20. In other words, the extension portion 15 can extend along the planar portion 32 of the coil 30 that is opposite to the first paper planes 13, 13.

[0034] Furthermore, the stretchable portion 15 is not limited to being formed as a triangular fold as shown in Figure 7(a), but can also be formed into various shapes that allow for stretching (expanding and contracting), such as being formed as a square (rectangular) fold in cross-section as shown in Figure 7(b), or being formed as an arc (for example, a semicircular) in cross-section as shown in Figure 7(c).

[0035] Furthermore, as shown in Figure 3, the extended portion 15 is formed extending from one axial end (upper end) to the other end (lower end) of the slot 25 (see Figure 2), and in this embodiment, it is provided with a protruding portion 16 that protrudes outward in the axial direction from one axial end of the slot 25. The extended portion 15 can be formed on at least a portion of the insulating paper 10 from one end to the other. For example, the extended portion 15 may be provided on the upper half of the insulating paper 10, or it may be provided only on the upper end or only on the lower end of the insulating paper 10, and can be formed in various sizes (lengths) and shapes considering the twisting direction of the coil 30.

[0036] The above describes the configuration of the stator 1 of the present invention. Next, the function of the extension portion 15 when twisting the coil 30 (terminal 31) in the stator 1 will be explained below. Note that Figures 4 to 6 illustrate an example where the terminal 31 of the coil 30 is twisted on both sides in the circumferential direction of the stator core 20.

[0037] As shown in Figure 4, when the coil 30 inserted inside the insulating paper 10 is twisted (bent) in the direction of the side walls 26,26 of the slot 25 (circumferential direction of the stator core 20), the insulating paper 10 is pulled in the direction of the side walls 26,26 of the slot 25 by the flat portion 32 of the coil 30. At this time, the stretched portion 15 stretches along the flat portion 32 of the opposing coil 30. In other words, the stretched portion 15 stretches along the side walls 26,26 of the opposing stator core 20.

[0038] Figure 5 shows the stretched portion 15 of the insulating paper 10 in an extended state. The stretching of the stretched portion 15 in the insulating paper 10 prevents the corners 11,11 of the insulating paper 10 from being pulled, even when the coil 30 is twisted and the insulating paper 10 is pulled. Therefore, the stator 1 of the present invention can prevent damage to the insulating paper 10 (especially the corners 11,11) from tearing or other damage.

[0039] Here, the insulating paper 10 is provided with a protruding portion 16 that extends upward from the upper end of the slot 25, as shown in Figures 3 and 6, in order to ensure sufficient insulation. Therefore, as shown in the left-hand diagram of Figure 6, when the coil 30 is twisted, the coil 30 contacts the protruding portion 16 of the insulating paper 10, pushing the protruding portion 16 outward in the circumferential direction of the stator core 20. However, since the stator 1 of the present invention is provided with an extension portion 15, the extension of the extension portion 15 can suppress damage to the insulating paper 10.

[0040] Furthermore, according to the stator 1 of the present invention, since the stretching portion 15 ensures the stretching allowance of the insulating paper 10, even if the upper end position (twisting start position) of the coil 30 is set lower by d1, as shown in the right-hand diagram of Figure 6, it is possible to suppress the insulating paper 10 from being pulled outward and tearing. In other words, with the stator 1 of the present invention, even if the upper end position of the coil 30 is lowered by d1 and the twisting angle of the coil 30 widens, the insulating paper 10 stretches and the angle of outward expansion is ensured, thus reducing the stress on the insulating paper 10. Thus, with the stator 1 of the present invention, the twisting start position of the coil 30 can be set lower, making the stator 1 more compact. In addition, with the stator 1 of the present invention, the length of the coil 30 can be reduced without increasing the amount of protrusion of the protruding portion 16 in the insulating paper 10, thus reducing costs.

[0041] The above describes one embodiment of the stator 1 of the present invention. Next, the effects and benefits realized by the stator 1 of the present invention will be described in detail below.

[0042] The stator 1 of the present invention described above has the following characteristic configurations as (a) and (b) and (e) to (h). Therefore, the stator 1 of the present invention can achieve unique effects that cannot be achieved with the prior art, as described below.

[0043] (a) The stator 1 of the above-described embodiment comprises a stator core 20 having a plurality of slots 25, insulating paper 10 inserted into the plurality of slots 25, and a coil 30 inserted into the plurality of slots 25 via the insulating paper 10, wherein the inner wall of the slot 25 has an outer wall 27 that extends circumferentially on the radially outer side of the stator core 20, and a pair of side walls 26, 26 formed along the radial direction of the stator core 20 and facing each other via the outer wall 27, the coil 30 has a rectangular cross-section and comprises a plurality of planar portions 32 that intersect the cross-section, and the insulating paper 10 has at least one stretchable portion 15 that can be stretched in a direction intersecting the axial direction of the stator core 20 when inserted into the slots 25, the stretchable portion 15 is provided at any position on the paper surface facing at least one of the plurality of planar portions 32 of the coil 30.

[0044] In the above-described embodiment, the stator 1 is equipped with an extendable portion 15 that allows the insulating paper 10 to stretch in a direction intersecting the axial direction of the stator core 20 (for example, in a direction along any of the pair of side walls 26, 26 and the outer wall 27 in the slot 25). Therefore, loads (stresses) such as tension applied to the insulating paper 10 can be relieved through the extendable portion 15. Furthermore, in the above-described embodiment, the extendable portion 15 is provided at one of the positions on the paper surface (insulating paper 10) facing the flat portion 32 of the coil 30. Therefore, even if the flat portion 32 of the coil 30 comes into contact with the insulating paper 10 due to the twisting of the coil 30, the insulating paper 10 is stretched in a direction intersecting the axial direction of the stator core 20 by the extendable portion 15. As a result, the stator 1 in the above-described embodiment can suppress damage to the insulating paper 10 (especially the corners 11 of the insulating paper 10) due to stress, and thus maintain the insulating performance of the insulating paper 10. Furthermore, the stator 1 of the above-described embodiment can secure the stretching allowance of the insulating paper 10 by the stretching portion 15, thereby lowering the height of the twisting (bending) initiation point of the coil 30 in the height direction. In other words, the stator 1 of the above-described embodiment relieves the stress caused by the stretching of the insulating paper 10 by the stretching portion 15, so the height of the twisting initiation point of the coil 30 can be lowered, and damage to the insulating paper 10 can be suppressed even when the twist angle becomes strong. As a result, the stator 1 of the above-described embodiment can reduce the vertical length of the insulating paper 10 and the length of the coil 30, so cost reduction can be expected.

[0045] (b) The stator 1 of the above-described embodiment is characterized in that the extension portion 15 is provided at a position facing at least one of the pair of side walls 26, 26 and the outer wall 27.

[0046] The stator 1 of the above-described embodiment, when configured as described in (b) above, can extend the insulating paper 10 along the pair of side walls 26, 26 and the outer wall 27. As a result, even when the coil 30 is twisted with the terminals 31 of the coil 30 inserted into the insulating paper 10, the stator 1 of the above-described embodiment can relieve the load on the insulating paper 10 through the extension portion 15. Therefore, the stator 1 of the above-described embodiment can suppress damage to the insulating paper 10.

[0047] (e) In the stator 1 of the above-described embodiment, the insulating paper 10 is formed to extend from one end to the other in the axial direction of the slot 25, and the extended portion 15 is formed to extend from one end to the other of the insulating paper 10 in the axial direction of the slot 25.

[0048] By configuring the stator 1 of the above-described embodiment as described in (e) above, the extended portion 15 of the insulating paper 10 can be made longer along the axial direction of the slot 25. Therefore, the stator 1 of the above-described embodiment can secure a wide range of elongation for the insulating paper 10, and thus can more reliably suppress damage to the insulating paper 10 when it comes into contact with the coil 30.

[0049] (f) In the stator 1 of the above-described embodiment, the insulating paper 10 is formed to extend from one end to the other in the axial direction of the slot 25, the coil 30 is formed to protrude from one end to the other in the axial direction of the slot 25, and the extended portion 15 is formed on at least a part of the insulating paper 10 from one end to the other end.

[0050] By configuring the stator 1 of the above-described embodiment as described in (f) above, the area in which the stretched portion 15 is formed in the insulating paper 10 can be reduced. This is expected to reduce the cost of forming the insulating paper 10.

[0051] (g) In the stator 1 of the above-described embodiment, the extended portion 15 is characterized in that the cross-section is formed as a triangular, square, or arc-shaped fold.

[0052] The stator 1 of the above-described embodiment, when configured as shown in (g) above, can easily secure the stretching allowance in the stretched portion 15. That is, the stator 1 of the above-described embodiment, when configured as shown in (g) above, stretches the fold allowance portion of the fold when the fold in the stretched portion 15 is straightened, so that the fold allowance portion can be secured as the stretching allowance of the insulating paper 10.

[0053] (h) In the stator 1 of the above-described embodiment, the insulating paper 10 is formed to extend from one end to the other in the axial direction of the slot 25, and is characterized by having a protruding portion 16 that protrudes outward in the axial direction from one end to the other in the axial direction of the slot 25.

[0054] In the above-described embodiment, the stator 1 is configured as described in (h) above, so that when the coil 30 is twisted (bent), the stretched portion 15 of the insulating paper 10 acts as an elongation allowance and the protruding portion 16 acts as an opening allowance, thereby more effectively suppressing damage to the insulating paper 10.

[0055] The above describes the operation and effects of stator 1 according to one embodiment of the present invention. Next, stator 100 according to the first modified example of the present invention will be described in detail below. Note that identical components are denoted by the same reference numerals. Furthermore, the same configuration as in the above-described embodiment will not be described.

[0056] ≪First Variation≫ As shown in Figure 8, the stator 100 according to the first modification is the same as the embodiment described above, except that the extended portion 15 is provided only on the first plane 13 facing one side wall 26 of the stator core 20. In the stator 100, the coil 30 is twisted on only one side. Therefore, in the stator 100, the extended portion 15 is provided on the first plane 13 on the twisted side of the coil 30.

[0057] As shown by the dashed line in the figure, the stator 100 is twisted on only one side of the coil 30, causing the coil 30 to come into contact with one side of the first paper surface 13 on the twisted side, and the stretched portion 15 of the first paper surface 13 to stretch. This relieves the load (stress) on the insulating paper 10.

[0058] The above describes the configuration of the stator 100 according to the first modified example. The stator 100 according to the first modified example can be configured as shown in (c) below, and can exhibit the following effects.

[0059] (c) In the stator 100 according to the first modified example, the extension portion 15 is provided only on the side of the insulating paper 10 facing the pair of side walls 26, 26 of the slot 25, that is on the side facing the twist direction of the coil 30.

[0060] The stator 100 according to the first modified example described above can be configured as shown in (c) above, thereby limiting the location where the extended portion 15 is formed to only the twisting direction side of the coil 30, and thus reducing the processing costs of the insulating paper 10 and the coil 30.

[0061] The above describes the configuration and effects of the stator 100 according to the first modified example. Next, the details of the stator 200 according to the second modified example will be described below. Note that identical components are denoted by the same reference numerals. Furthermore, the same configuration as in the above-described embodiment will not be explained.

[0062] ≪Second variation≫ As shown in Figure 9, the stator 200 according to the second modification is the same as the embodiment described above, except that the extended portion 15 is provided on the second paper surface 14 facing the outer wall 27 of the stator core 20. In the stator 200 according to the second modification, the extended portion 15 is formed by folding the second paper surface 14 of the insulating paper 10 in a rectangular shape in cross-section. In the stator 200 according to the second modification, a pair of extended portions 15, 15 are provided at positions facing a pair of corners 11, 11. Therefore, when twisting is applied to the coil 30, the second paper surface 14 stretches in both directions along the outer wall 27. In other words, when twisting is applied to the coil 30, the second paper surface 14 stretches in both directions along the planar portion 32 of the coil 30 (terminal 31) that faces the second paper surface 14. This reduces the load (stress) on the insulating paper 10 (especially the corners 11, 11).

[0063] The above describes the configuration of the stator 200 according to the second modified example. The stator 200 according to the second modified example can be configured as shown in (d) below, and can exhibit the following effects.

[0064] (d) In the stator 200 according to the second modified example, the extension portion 15 is provided on the surface facing the outer wall 27 of the slot 25 and is provided at a position facing at least one of the pair of corner portions 11, 11 formed by the outer wall 27 and the pair of side walls 26, 26.

[0065] The stator 200 according to the second modified example described above can be configured as shown in (d) above to directly relieve the stress applied around the corners 11, 11 (folded corners 11, 11) of the insulating paper 10. Therefore, the stator 1 of the above embodiment can more effectively suppress damage to the corners 11 of the insulating paper 10.

[0066] The above describes the configuration and effects of the stators 1,100,200 of the present invention. However, the stators 1,100,200 of the present invention are not limited to the embodiments or modifications described above, and various modifications can be made within the scope of the present invention. For example, the stators 1,100,200 can be as described in (a) above, and can be formed in various shapes and sizes. Furthermore, the stator 1 of the present invention may, for example, not have some or all of the configurations described in (b) to (h) above, or may have some or all of the configurations described in (b) to (h) above, and other configurations.

[0067] The above describes the configuration and effects of the embodiments of the present invention. However, the stators 1,100,200 of the present invention are not limited to the embodiments described above, and various modifications can be made within the scope of the present invention.

[0068] The stator core 20 used in this embodiment is not limited to the embodiment described above, and various shapes, sizes, and materials can be used. Furthermore, various shapes and sizes can be used for the multiple slots 25 provided in the stator core 20. The shape of the inner wall of the slot 25 can also be modified in various ways depending on the shape and size of the slot 25 and the shape and size of the inserted coil 30.

[0069] Furthermore, in this embodiment, the insulating paper 10 is formed in a substantially pentagonal prism shape and has insulating paper openings 12 facing radially inward of the stator core 20. However, the shape and size of the insulating paper 10 can be changed to various shapes and sizes depending on the shape and size of the slots 25 of the stator core 20, the coils 30, etc. Also, the insulating paper openings 12 in the insulating paper 10 may be provided as needed, and their position can be changed as appropriate. In addition, various materials such as paper, resin, and rubber can be used for the insulating paper 10. Furthermore, the coils 30 (terminals 31) used in this embodiment are not limited to the embodiment described above, and various shapes, sizes, and materials can be used. For example, coils 30 of various forms can be used, such as those with different numbers and arrangements of terminals 31, or those with different twist directions of terminals 31.

[0070] Furthermore, in this embodiment, the coil 30 has a rectangular cross-section and is provided with a plurality of planar portions 32 that intersect the cross-section, but the shape, size, and material of the coil 30 can be modified in various ways within the scope of the invention. For example, the planar portions 32 of the coil 30 may be slightly curved or have been processed such as chamfering.

[0071] In this embodiment and this modified example, the extension portion 15 is provided in a position parallel to and facing either the pair of side walls 26, 26 or the outer wall 27. However, the extension portion 15 may also be positioned so as to be inclined at an angle to either the side walls 26, 26 or the outer wall 27.

[0072] In the first modified example, the extension portion 15 is provided only on the side of the insulating paper 10 facing the pair of side walls 26, 26 of the slot 25 that is in the twisting direction of the coil 30, and is positioned opposite the flat portion 32 of the coil 30. However, the present invention is not limited thereto. For example, the extension portion 15 may be provided only on the side of the coil 30 that is in the twisting direction, and at a position away from the flat portion 32 of the coil 30 (for example, between multiple coils 30).

[0073] In the second modified example, the extension portion 15 is provided on the surface of the slot 25 facing the outer wall 27 and is positioned to face both of the pair of corners 11, 11 formed by the outer wall 27 and the pair of side walls 26, 26. However, the present invention is not limited thereto. For example, at least one extension portion 15 may be provided at a position facing the outer wall 27 other than the corners 11, 11. In other words, the extension portion 15 can be provided at various positions where no load is placed on the corners 11.

[0074] In this embodiment, the insulating paper 10 is formed to extend from one end to the other in the axial direction of the slot 25, and the extended portion 15 is formed to extend from one end to the other of the insulating paper 10 in the axial direction of the slot 25. However, the present invention is not limited to this. For example, the extended portion 15 may be formed on at least a part of the insulating paper 10 from one end to the other. Specifically, the extended portion 15 may be formed from the upper end of the insulating paper 10 to the middle portion in the vertical direction of the insulating paper 10 (for example, from the upper end to the halfway point in the vertical direction).

[0075] In this embodiment, the cross-section of the stretched portion 15 is formed as a triangular, square, or arc-shaped fold, but the stretched portion 15 can be formed into various shapes that can be stretched in a predetermined direction. Also, in this embodiment, multiple stretched portions 15 are provided at intervals, but the stretched portions 15 may be provided in multiple consecutive sections (for example, in a bellows shape) or as a single section, as needed.

[0076] In this embodiment, the insulating paper 10 is provided with a protruding portion 16 that protrudes outward in the axial direction from one end of the slot 25 in the axial direction. However, the insulating paper 10 may also be provided without the protruding portion 16. In such cases, it is desirable to apply insulating treatment to the upper end of the slot 25 and the portion of the terminal 31 that comes into contact with the slot 25. Furthermore, when the insulating paper 10 is provided with a protruding portion 16, the amount of protrusion of the protruding portion 16 can be set to various amounts depending on the amount of twist (bending) of the coil 30 (terminal 31), the upper end position of the coil 30 (starting position of twist), the material of the coil 30, etc.

[0077] The above describes various embodiments and modifications of the stator according to the present invention. However, the present invention is not limited to those exemplified in the embodiments and modifications described above, and it will be readily apparent to those skilled in the art that other embodiments may exist in the spirit and teachings thereof, without departing from the scope of the claims. [Industrial applicability]

[0078] The present invention can be suitably used for assembling coils to a stator core that constitutes a motor, generator, or the like. [Explanation of symbols]

[0079] 1: Status 10: Insulating paper 11: Corner (folded corner) 13: 1st page (1st page) 14: 2nd page (2nd page) 15: Stretching part 16:Protrusion 20: Stator core 25: Slot 26: Side wall 27 :Outer wall 30: Coil 31: Terminal 32: Flat part

Claims

1. A stator core having multiple slots, The insulating paper inserted into the aforementioned multiple slots, A coil inserted into the plurality of slots via the insulating paper, A stator equipped with, The inner wall of the aforementioned slot is The outer wall of the stator core extends circumferentially on the radially outer side, The stator core is formed along the radial direction and has a pair of side walls facing each other via the outer wall, It has, The coil has a rectangular cross-section and is provided with a plurality of planar portions that intersect the cross-section. The insulating paper, when inserted into the slot, has at least one stretchable portion that can be stretched in a direction intersecting the axial direction of the stator core, A stator characterized in that the extended portion is provided at any position on the plane of paper facing at least one of the plurality of planar portions in the coil.

2. The stator according to claim 1, characterized in that the extended portion is provided at a position facing at least one of the pair of side walls and the outer wall.

3. The stator according to claim 1 or 2, characterized in that the extended portion is provided only on the side of the coil that is in the twisting direction of the coil, out of the two sides of the insulating paper that are opposite to the pair of side walls of the slot.

4. The stator according to claim 1 or 2, characterized in that the extended portion is provided on a surface facing the outer wall of the slot and is positioned facing at least one of a pair of corners formed by the outer wall and the pair of side walls.

Images