JP2014187739A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent damage of an insulator film which is inserted into a slot in a stator core of a motor.SOLUTION: Relief parts 20-20 are formed by obliquely cutting a portion of side surface parts 17 and 17 and a back surface part 16 of a cuff 18. A coil 10 mounted in a slot 8 adds power to the side surface parts 17 and 17 of the cuffs 18 and 18. An insulator film 9 is allowed to be deformed in a circumferential direction of a stator core 6 as illustrated by a virtual line since the side surface parts 17 and 17 are separated from end faces 7 and 7 of the stator core 6 when power of the coil 10 is applied. In the cuff 18, the power generated by the coil 10 in the circumferential direction of the stator core 6 is absorbed by deforming the insulator film 9, and loads applied to folding positions 15 and 15 of first folded parts 14 and 14 are mitigated. Thus, damage such as cracking at the folding positions 15 and 15 is suppressed and the insulator film 9 can be prevented from being damaged.

Description

  The present invention relates to an insulating film interposed between a stator core of an electric motor and a coil mounted in a slot of the stator core.

  For example, in Patent Document 1, a coil is mounted via an insulating member made of two insulating films inserted into a slot of the stator core for the purpose of suppressing damage to the insulating member inserted into the slot of the stator core. An electric motor is disclosed.

  Specifically, the coil-side insulating film has a cuff part bent outward, and is curved in a substantially U shape in accordance with the shape of the slot having a U-shaped cross section. A film penetrating portion that penetrates the coil-side insulating film in the thickness direction is provided in a region where the bending position generated by forming the cuff portion and the bending position generated by bending overlap. The stator core side insulating film is stacked in a state of being sandwiched between the upper and lower cuff portions of the coil side insulating film. The stator core side insulating film can completely block the film penetration part provided in the coil side insulating film, and exhibits an insulating function by the combination of both insulating films. Moreover, the film penetration part provided in the stator core side insulating film can eliminate stress concentration that is likely to occur in the region, and can suppress damage to the insulating member.

JP2012-133891A

  However, in the configuration of Patent Document 1, when a coil is mounted in the stator core slot, a large force is generated in the circumferential direction of the stator core by the coil, and the insulating member receives a load in the circumferential direction of the stator core. In particular, since the cuff part of the insulating member is in contact with the end face of the stator core, this contact part serves as a fulcrum, and a load is applied to the bending position of the cuff part, and there is a risk of causing a crack at the bending position.

  An object of the present invention is to prevent damage to an insulating film inserted into a slot of a stator core of an electric motor.

  The present invention includes a rotor and a stator, and a coil is attached to a slot having a U-shaped cross section formed in a stator core of the stator via an insulating film, and at least a part of the insulating film is accommodated in the slot. And a pair of cuffs that abut against both end faces of the stator core and prevent falling out of the slot. The insulating film includes at least a pair of first bent portions and a pair of second bent portions. The pair of first bent portions is bent to form a back portion and a pair of side portions that match the shape of the slot, and the second bent portion is bent to form the main body portion and the pair of cuffs. In the electric motor forming the body portion and the cuff between the back portion and the side portion A through hole is formed in a portion corresponding to the gap, and the cuff has a back surface abutting against an end surface of the stator core, and the side surface portion is separated from the end surface of the stator core. To do.

  According to the first aspect, by forming the through hole, it is possible to reduce the concentration of stress at a portion between the back surface portion and the side surface portion and between the main body portion and the cuff. Furthermore, since the back surface portion of the cuff contacts the end surface of the stator core and the side surface portion of the cuff that is the circumferential direction of the stator core is separated from the end surface of the stator core, the deformation of the insulating film in the circumferential direction of the stator core can be allowed. it can. For this reason, the force in the circumferential direction of the stator core generated by the coil mounted in the slot is absorbed by the deformation of the insulating film, and the load applied to the bending position of the second bent portion is reduced. Therefore, damage to the insulating film can be prevented.

  According to a second aspect of the present invention, the cuff is spaced from the end surface of the stator core from a part of the back surface portion to the side surface portion. According to the second aspect of the present invention, the load applied to the bending position of the second bent portion is reliably reduced because the cuff is separated from the end surface of the stator core from a part of the back surface portion to the side surface portion.

  According to a third aspect of the present invention, the cuff is spaced from the end surface of the stator core from a part of the back surface portion located on the inner side of the formation position of the through hole to the side surface portion. According to the third aspect, since it is separated from the end surface of the stator core from a part of the back surface portion located on the inner side of the through hole formation position to the side surface portion, the load applied to the bending position can be further reduced.

  According to a fourth aspect of the present invention, the cuff is shorter than the back surface portion so as to be separated from the end surface of the stator core. According to the fourth aspect, by shortening the side surface portion of the cuff, it can be easily separated from the end surface of the stator core.

  According to a fifth aspect of the present invention, the cuff is formed so as to be gradually shortened from the back surface portion toward the side surface portion. According to the fifth aspect, the insulating film is easily deformed in the circumferential direction of the stator core.

  According to a sixth aspect of the present invention, the side surface portion is separated from the end surface of the stator core by cutting off a part of the cuff. According to the sixth aspect, it is easy to form the cuff whose side surface portion is separated from the end surface of the stator core.

  According to a seventh aspect of the present invention, the side surface portion is separated from the end surface of the stator core by cutting a part of the cuff obliquely. According to the seventh aspect, it is easy to form the cuff whose side surface portion is separated from the end surface of the stator core.

  The present invention can prevent damage to the insulating film inserted into the slot of the stator core of the electric motor.

It is the top view which carried out the cross section of a part of electric motor. It is a perspective view of a stator core. It is the elements on larger scale of the slot seen from the inner side of the stator core. It is the elements on larger scale of the slot seen from the end surface side of the stator core. FIG. 4 is a partially enlarged view of a slot similar to FIG. 3 for explaining the operation of the insulating film. It is an expanded view of the insulating film inserted in a slot. It is a perspective view of the insulating member inserted in a slot.

  FIG. 1 shows an electric motor 1 that drives an electric compressor of a vehicle air conditioner. The electric motor 1 includes a rotor 3 in a case 2 and a stator 4 disposed on the outer periphery of the rotor 3. The rotor 3 is fixed to a rotating shaft 5 that is rotatably installed at the center of the case 2, and the stator 4 is fixed to the case. The stator core 6 of the stator 4 is formed with a plurality of slots 8 that pass through both end faces 7 and 7 (see FIG. 2) of the stator core 6 and open to the inside, that is, the rotor 3 side. The coil 10 is mounted by concentrated winding via

  FIG. 2 shows the configuration of the slot 8 in detail. The slot 8 has a U-shaped cross section and has an opening 11 facing the rotor 3. The slot 8 having a U-shaped cross section is formed by a bottom wall 8a positioned in the circumferential direction of the stator core 6 and side walls 8b and 8b positioned in the radial direction of the stator core 6. The bottom wall 8a and the side walls 8b and 8b have a radius of curvature. Are connected by small arc surfaces 8c, 8c.

  3 and 4 show an enlarged view of the structure in which the insulating film 9 is inserted into the slot 8. The insulating film 9 inserted into the slot 8 uses a film made of a material such as polyphenylene sulfide (PPS), polyethylene terephthalate (PET), or polyethylene naphthalate (PEN), which has a property of being relatively less degraded by hydrolysis. be able to.

  The insulating film 9 is cut from an insulating film roll (not shown) into a rectangular flat material shown in FIG. 6 so that it can be inserted into the slot 8. The cut insulating film 9 has a width (length in the left-right direction in FIG. 6) along the bottom wall 8a and side walls 8b, 8b of the slot 8 and a height protruding from the both end faces 7, 7 of the stator core 6 by a certain amount. Length in the vertical direction (length in the vertical direction in FIG. 6). The insulating film 9 is provided with folds indicated by dotted lines at the folding positions 13 and 13 for forming the pair of left and right first bent portions 12 and 12, and the pair of upper and lower second bent portions 14 and 14 is formed. For this reason, fold lines 15 and 15 are provided with creases indicated by dotted lines.

  The bending positions 13 and 13 are set at positions corresponding to the arcuate surfaces 8c and 8c of the slot 8. The bending positions 15 and 15 are such that the upper and lower end portions when the second bent portions 14 and 14 are bent along the folds have a length L1 that can contact the both end surfaces 7 and 7 of the stator core 6, respectively. It is positioned. The first bent portions 12 and 12 are bent in a direction that becomes the inner side of the stator core 6 so that the bent positions 13 and 13 are ridge lines, whereby a back surface portion 16 and a pair of side surface portions 17 that match the shape of the slot 8 are provided. 17 is formed. The second bent portions 14, 14 are bent in a direction toward the outer side of the stator core 6 so that the bent positions 15, 15 are ridge lines, whereby a main body portion 23 (see FIG. 7) accommodated in the slot 8 and a pair of Cuffs 18 and 18 are formed. The cuffs 18 and 18 indicate that when the insulating film 9 is inserted into the slot 8, the back portions 16 of the cuffs 18 and 18 come into contact with both end surfaces 7 and 7 of the stator core 6 and the insulating film 9 falls out of the slot 8. It has a function to prevent.

  Further, in the second bent portions 14, 14, a portion 19 (see a hatched portion indicated by an imaginary line) corresponding to a part of the side surface portions 17, 17 and the back surface portion 16 is cut out obliquely, and the cuffs 18, 18 are cut. Load relief portions 20 to 20 are formed at four locations. Each relief part 20-20 cuts the insulating film 9 from the side face parts 17 and 17 side to the position P on the back face part 16 side, so that the length L2 from the bending position 15 extends over the entire length of the relief parts 20-20. Thus, the back surface portion 16 of the cuff 18 is formed so as to be shorter than the length L1 of the portion in contact with the end surface 7 of the stator core 6. Therefore, the cuffs 18 and 18 are formed so as to be gradually shortened from the back surface portion 16 toward the side surface portions 17 and 17. In addition, the position P which becomes the terminal part of the relief parts 20 to 20 is set to a point which coincides with at least the bending position 13, and the side parts 17 and 17 of the cuffs 18 and 18 may be shorter than the back part 16. In the present embodiment, the position P is located on the inner side than the bending position 13 and is located on the inner side of the formation position of a through hole 22 described later.

  In the insulating film 9, circular through holes 22 centering on the intersection 21 are formed at each intersection 21 where the folding positions 13, 13 and the bending positions 15, 15 intersect at right angles. That is, the through hole 22 is formed in a portion between the back surface portion 16 and the side surface portions 17 and 17 and between the main body portion 23 and the cuffs 18 and 18. The through-hole 22 eliminates the corner formed at the intersection 21 when the first bent portions 12 and 12 and the second bent portions 14 and 14 are both bent, and can relieve stress concentration at the intersection 21.

  In the insulating film 9 shown in the development view in FIG. 6, the second bent portions 14, 14 are bent along the folding positions 15, 15, and the first bent portions 12, 12 are bent along the folding positions 13, 13. The insulating film 9 shown in FIG. 7 is obtained. In the insulating film 9 of FIG. 7, a back surface portion 16 and a pair of side surface portions 17, 17 are formed by the first bent portions 12, 12, and a main body portion 23 and a pair of cuffs 18, 18 are formed by the second bent portions 14, 14. Is formed.

  As shown in FIG. 3, the insulating film 9 inserted into the slot 8 of the stator core 6 has the back surface portion 16 and the side surface portions 17 and 17 disposed along the bottom wall 8 a and the side walls 8 b and 8 b of the slot 8, respectively. Further, the insulating film 9 is prevented from falling out of the slot 8 by the tip portions of the cuffs 18 and 18 positioned on the back surface 16 side of the upper and lower ends contacting the both end surfaces 7 and 7 of the stator core 6 respectively. Since the relief portions 20 to 20 of the cuffs 18 and 18 are formed shorter than other portions of the cuffs 18 and 18, a constant gap is formed between both end surfaces 7 and 7 of the stator core 6. That is, the cuffs 18 and 18 are spaced from both end surfaces of the stator core 6 from a part of the back surface portion 16 to the side surface portions 17 and 17.

  After the insulating film 9 is inserted into the slot 8 of the stator core 6, the coil 10 is attached to the main body portion 23 of the insulating film 9 by concentrated winding so as to fill the slot 8. As shown in FIG. 4, a separator 25 made of an insulating material is inserted between the coils 10 facing in two directions to insulate the coils 10 in the slot 8. In addition, a coil retainer 24 is inserted into the slot 8 so as to block the opening 11 so that a part of the mounted coil 10 does not escape from the opening 11 of the slot 8. The coil retainer 24 is made of the same material as that of the insulating film 9, and both end portions 24 a and 24 a are slightly curved toward the inner side of the slot 8 and overlapped with a part of the insulating film 9, and between the stator core 6 and the coil 10. Insulated.

  The insulating film 9 reduces the concentration of stress on the corresponding portion between the main body portion 23 and the cuffs 18 and 18 between the back surface portion 16 and the side surface portions 17 and 17 by forming the through holes 22. Can do. Further, since the coil 10 inserted in the slot 8 is continuous with the coil mounted in the other slot 8, a large force is applied to the side surface portions 17 and 17 of the cuffs 18 and 18 in the circumferential direction of the stator core 6. To do. However, in the insulating film 9, the side surfaces 17 and 17 of the cuffs 18 and 18 are separated from the end surfaces 7 and 7 of the stator core 6 by the relief portions 20 to 20 of the cuffs 18 and 18, which are indicated by phantom lines in FIG. Thus, the deformation of the insulating film 9 in the circumferential direction of the stator core 6 can be allowed. Therefore, the force in the circumferential direction of the stator core 6 generated by the coil 10 mounted in the slot 8 is absorbed by the deformation of the insulating film 9, and the load applied to the bending positions 15 and 15 of the second bent portions 14 and 14 is reduced. The Therefore, damage such as cracks at the bending positions 15 and 15 is suppressed, and damage to the insulating film 9 can be prevented.

  In particular, when the coil 10 is mounted by concentrated winding, the load applied to the bending positions 15 and 15 increases, but in the embodiment, the side surface portions 17 and 17 of the cuffs 18 and 18 are separated from the end surfaces 7 and 7 of the stator core 6. With this configuration, the load can be reliably reduced. In addition, the length L2 of the cuff 18 is shortened in the insulating film 9, but because of the presence of the cuff 18, a sufficient creeping distance and space distance between the end faces 7, 7 of the stator core 6 and the coil 10 can be obtained. Even if the size of 9 is used as it is, the reliability of the insulation function can be sufficiently obtained. Further, even if the insulating film 9 is composed of a single sheet, the insulating film 9 protruding from the end faces 7 and 7 of the stator core 6 is substantially overlapped by the formation of the cuff 18 so that the strength of the insulating film 9 is sufficient. Can get to.

  The present invention is not limited to the configuration of the above-described embodiment, and various modifications are possible within the scope of the gist of the present invention, and can be implemented with the following configuration.

(1) The relief portions 20 to 20 are formed obliquely with respect to the bending position 15, but may be formed in a curved shape or stepped shape, or in a parallel state.
(2) Although the relief part 20-20 showed the example formed by excising a part of the insulating film 9, the insulating film manufactured by the shape etc. which provided the relief part 20-20 beforehand by shaping | molding etc. was shown. It may be used. In FIG. 6, a portion 19 corresponding to a part of the side surface portions 17 and 17 and the back surface portion 16 may be bent.
(3) The through-hole 22 is not limited to a circular hole, and can be configured by an elliptical shape, a fan shape, or a square-shaped hole having a triangle or more.
(4) The structure in which the through-hole 22 is formed around the intersection 21 between the folding position 13 of the first folding section 12 and the folding position 15 of the second folding section 14 is shown, but it is necessary to limit to this configuration. The through hole 22 may be drilled in a form in which at least the intersection 21 is included in a part of the through hole 22.

(5) The through-holes 22 are individually drilled at the two intersections 21, but may be configured by one hole drilled so as to include the two intersections 21 and 21.
(6) The shape of the slot 8 may be constituted by a single circular arc surface combining the bottom wall 8a and the circular arc surface 8c, and similarly configured by a single circular arc surface combining the side wall 8b and the circular arc surface 8c. It is also possible. In this case, the bending position 13 of the first bent portion 12 is the boundary between one arc surface forming the bottom wall 8a and the side wall 8b, the boundary between one arc surface forming the side wall 8b and the bottom wall 8a, or the bottom wall. It is formed so as to correspond to the boundary between one arc surface forming the 8a side and one arc surface forming the side wall 8b side.

(7) The insulating film 9 is not limited to being composed of a single sheet, but may be composed of a plurality of sheets.
(8) The coil 10 is mounted by concentrated winding, but is not limited thereto, and may be mounted by distributed winding or the like.
(9) Although the electric motor 1 has been described as an electric motor of an electric compressor of a vehicle air conditioner, other electric motors that are generally used may be used.

DESCRIPTION OF SYMBOLS 1 Electric motor 3 Rotor 4 Stator 6 Stator core 7 End surface 8 Slot 8a Bottom wall 8b Side wall 9 Insulating film 10 Coil 12 1st bending part 13, 15 Bending position 14 2nd bending part 16 Back surface part 17 Side face part 18 Cuff 19 Cutting part 20 Relief Part 21 Intersection 22 Through-hole 23 Body

Claims (7)

A coil including a rotor and a stator, a coil having a U-shaped cross section formed in a stator core of the stator being interposed via an insulating film, and at least a part of the insulating film being housed in the slot; And a pair of cuffs that come into contact with both end faces of the stator core and prevent falling out of the slot, and the insulating film has at least a pair of first bent portions and a pair of second bent portions, and In the electric motor in which a pair of first bent portions are bent to form a back surface portion and a pair of side surface portions that match the shape of the slot, and the second bent portion is bent to form the main body portion and the pair of cuffs. ,
A through hole is formed in a portion between the back surface portion and the side surface portion and between the main body portion and the cuff, and the cuff is in contact with the end surface of the stator core. And the said side part is spaced apart from the end surface of the said stator core, The electric motor characterized by the above-mentioned.   The electric motor according to claim 1, wherein the cuff is separated from an end surface of the stator core from a part of the back surface portion to the side surface portion.   The cuff is separated from the end surface of the stator core from a part of the back surface portion located on the inner side of the formation position of the through hole to the side surface portion. Electric motor.   The electric motor according to any one of claims 1 to 3, wherein the cuff is shorter than the back surface portion so as to be separated from an end surface of the stator core.   The electric motor according to claim 4, wherein the cuff is formed so as to be gradually shortened from the back surface portion toward the side surface portion.   6. The electric motor according to claim 1, wherein the side surface portion is separated from an end surface of the stator core by cutting off a part of the cuff.   The electric motor according to claim 6, wherein the side surface portion is separated from the end surface of the stator core by cutting off a part of the cuff in an oblique manner.

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