JP5142534B2 - Electric motor - Google Patents

Description

  The present invention relates to an electric motor in which a distributed winding type winding is provided in a slot of a stator core and interlayer insulation is provided between layers of a coil end portion.

Conventionally, there exists an electric motor as shown in patent document 1 (Unexamined-Japanese-Patent No. 2006-87153).
In Patent Document 1, a winding is inserted into a slot penetrating in the axial direction of the stator core, and the winding insulates between the different layers of the coil end portion protruding from the axial end of the stator core, and the insulation In interlayer insulation provided with a plurality of legs connecting the parts, the legs at the ends of the insulating members are inserted so as to overlap in the same slot. This reduces the occurrence of insulation failure due to the movement of the insulating member during coil end molding and contact with different layers.

JP 2006-87153 A

  However, the interlayer insulation of the three-phase motor as in Patent Document 1 is formed so as to spread the coil end portion of the outer layer coil in the outer diameter direction of the stator so that the middle layer coil can be easily inserted after the outer layer coil is inserted. Next, the interlayer insulation is arranged along the inner periphery of the coil end portion, and the middle layer coil is inserted. When the middle layer coil is inserted, the interlayer insulation disposed between the outer layer coil and the middle layer coil is wound by the insertion pressure of the winding, and the windings of the outer layer coil and the middle layer coil come into contact with each other, resulting in poor insulation.

  Similarly, after the middle layer coil is inserted, the outer layer coil and the middle layer coil are molded so that the coil end portions of the outer layer coil and the middle layer coil are expanded in the stator outer diameter direction so that the inner layer coil can be easily inserted. Interlayer insulation is arranged along the inner line coil and an inner layer coil is inserted. When the inner layer coil is inserted, an interlayer insulation disposed between the middle layer coil and the inner layer coil is wound by the insertion pressure of the winding, and the windings of the middle layer coil and the inner layer coil come into contact with each other, resulting in poor insulation.

  In addition, after inserting the outer layer coil, the interlayer insulation is arranged and the middle layer coil is inserted, and further, the outer layer and the middle layer coil end portions are pushed and expanded in the stator outer diameter direction so that the inner layer coil can be easily inserted. At this time, the connecting portion between the leg portion of the interlayer insulation and the insulating member of the coil end portion is often pulled out, resulting in poor insulation.

  Similarly, after inserting the outer layer coil and the middle layer coil into the stator core, the interlayer insulation is arranged, and when the inner layer coil is inserted and the same molding is performed, the interlayer insulation leg and the coil end portion insulation member In many cases, the connecting portion of the wire is pulled and broken, resulting in poor insulation.

  On the other hand, if interlayer insulation with a large coil end portion is used to worry about interlayer insulation failure, an excess portion of the interlayer insulation protrudes from the coil end portion and must be removed after forming the coil end portion.

The present invention relates to a motor in which a winding is inserted by a distributed winding method into a slot penetrating in the axial direction of a stator core of a three-phase motor or a single-phase motor. In the motor provided with interlayer insulation that insulates each layer of the three-phase motor or the single-phase motor,
The interlayer insulation is a first insulating portion that insulates coil end portions protruding in the stator axial direction from both end faces of the stator core;
A second insulating portion that insulates a coil end portion protruding in the stator axial direction from the end surface of the stator core opposite to the insulating portion;
The first insulating portion and the second Bei Eteiru a leg portion connecting the insulating portion.

The first insulating portion and the first insulating portion of the sides and the side of the second insulating portion facing the space portion surrounded by the leg portion connecting the second insulating portion of the interlayer insulation of the insulating portion It has a stepped shape with notches on either side or either side . The stepped shape in which the insulating portion is cut out includes a side of the first insulating portion extending at right angles to a leg portion connecting the first insulating portion and the second insulating portion of the interlayer insulation, and a second shape. Provided on the side of the insulating part, and enters the space side surrounded by the side of the first insulating part, the side of the second insulating part and the leg part, and enters the inside by about one slot pitch at the slot pitch of the stator. It has a stepped shape that is notched from the vertical position toward the insulating part.

The circumferential insulating both ends of the first insulating portion and the second insulating portion of the interlayer insulation are attached to the stator core so that both ends overlap each other,
An electric motor in which legs of the interlayer insulation are always inserted into slots located at both ends of the split of the winding of the next layer inserted inside each layer inserted into the slot.

  And the shape where the ear | edge part which protruded in the circumferential direction was provided in the one end of the circumferential direction edge part of the 1st insulating part of the said interlayer insulation, and the 2nd insulating part, and the ear | edge part was not provided in the other end It has become.

The present invention can be used for a three-phase motor and a single-phase motor in which windings are inserted into slots by a distributed winding method, thereby preventing contact of windings between layers and reducing insulation failure. In particular, the interlayer insulation is caught by the insertion pressure when the windings are inserted into the slots of the stator core, and contact between the windings can be prevented. Further, the legs of the interlayer insulation are not cut by the insertion pressure inserted into the slots of the stator core, and the windings do not contact each other .

In addition, the side of the first insulating part and the side of the second insulating part facing the space surrounded by the leg part connecting the first insulating part and the second insulating part of the interlayer insulation are on the insulating part side. By adopting a stepped shape that is notched, it is possible to prevent contact between the respective layers as described above, and to improve workability.

  The notched portion of the stepped shape is approximately one slot pitch of the slot pitch of the stator toward the space surrounded by the leg portion connecting the first insulating portion and the second insulating portion of the interlayer insulation. By adopting a stepped shape that is cut out from the position where it enters inside to the insulating part side, even if the winding of each layer is inserted into the slot of the stator and greatly formed on the outer diameter side of the stator, the interlayer insulating leg part Since the stepped shape is notched to the insulating portion side from the position where it enters the inside of about 1 slot pitch at the root portion of the wire, the windings in the slot root portion of the winding inserted in the next layer by this stepped shape Insulation failure can be reduced. Further, since the stepped shape is cut out on the insulating portion side, even if the winding is formed largely on the outer diameter side of the stator, the interlayer insulation does not pop out on the inner diameter side of the stator.

  Also, one end of the circumferential end portions of the first insulating portion and the second insulating portion of the interlayer insulation is provided with an ear portion protruding in the circumferential direction, and the other end is not provided with an ear portion. Therefore, the side where the ear portion is not provided should prevent the end of the interlayer insulating portion from jumping out to the inner diameter side of the stator or the outer diameter side of the stator at the dividing portion that is the boundary between the windings. In addition, the amount of insulating material used can be reduced. On the contrary, on the side where the ear portion is provided, when the leg portion of the interlayer insulation is inserted into the slot of the stator core, the leg portion can be inserted while pulling the ear portion, so that workability can be improved.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a stator 30 of an electric motor according to an embodiment of the present invention. 2 is a view of the stator 30 of the electric motor shown in FIG. In FIG. 1 and FIG. 2, illustration of the fixing strings for fixing the coil end portions 32 and 33 and the interlayer insulations 40 and 50 are omitted for easy understanding of the drawings.

  The stator 30 of the electric motor shown in FIGS. 1 and 2 is a stator core 31 in which a plurality of thin electromagnetic steel plates are laminated, and a slot 34 is formed by teeth 31a protruding in a stator inner diameter direction from a yoke 31b. Yes. The slot 34 is provided with a slot insulation 35 and a winding 36 by a distributed winding method is inserted. The stator 30 of this embodiment has 24 slots. As shown in FIGS. 2 and 3, the winding 36 has an outer layer coil 36 a that is a slot NO. 1 and 6, 7 and 12, 13 and 18, 19 and 24, and then the middle coil 36b is inserted into the slot NO. 3 and 8, 9 and 14, 15 and 20, 21 and 2. Finally, the inner layer coil 36 c is inserted into the slot NO. Three-phase four-pole motors inserted in 5 and 10, 11 and 16, 17 and 22, 23 and 4. In this case, the outer layer coil 36a is an outer phase coil that constitutes one of the U phase, the V phase, and the W phase, and the middle layer coil 36b constitutes one of the U phase, the V phase, and the W phase. It is an intermediate phase coil, and the inner layer coil 36c is an inner phase coil constituting any one of the U phase, the V phase, and the W phase, and each layer is between each phase.

  The winding 36 of the electric motor of the present embodiment is one coil per slot, and the winding 36 wound concentrically by the winding machine in the slot 34 of the stator core 31 is a winding insertion device called an inserter. Is inserted into the slot 34. When inserting the winding 36, the winding insertion device simultaneously inserts a wedge so that the inserted winding bundle does not spill from the slot opening side opened to the inner diameter side of the stator and cause insulation failure.

  In the procedure of inserting the winding 36 into the slot 34 of the stator core 31, the slot insulation 35 is disposed in the slot 34 of the stator core 31, and the outer layer coil 36a is inserted from above. Next, the coil end portions 32 and 33 protruding from the end face of the stator core 31 of the outer layer coil 36a are formed so as to be opened largely to the outer diameter side of the stator 30 so that the middle layer coil 36b can be easily inserted. Thereafter, an interlayer insulation 40 is inserted between the outer layer coil 36a and the middle layer coil 36b so as not to contact with the next inserted winding 36 (in this case, the middle layer coil 36b) and cause insulation failure.

  Similarly, the coil end portions 32 and 33 projecting from the end face of the stator core 31 of the intermediate layer coil 36b are increased to the outer diameter side of the stator 30 so that the intermediate layer coil 36b is inserted and then the inner layer coil 36c is easily inserted. Molded to open. Thereafter, an interlayer insulation 50 is inserted between the middle layer coil 36b and the inner layer coil 36c so as not to contact with the inserted winding 36 (in this case, the inner layer coil 36c) and cause insulation failure. Finally, the inner layer coil 36c is inserted.

  The interlayer insulation 40 of the present embodiment includes a first insulating portion 40a that insulates the coil end portion 32 that protrudes from both end faces of the stator core 31 in the stator axial direction, and a fixed portion opposite to the first insulating portion 40a. A second insulating portion 40b that insulates the coil end portion 33 protruding from the end surface of the core 31 in the stator axial direction, and a leg portion 40X that connects the first insulating portion 40a and the second insulating portion 40b. Yes. The leg portion 40X is mounted in the slot 34 of the stator core 31, and connects the first insulating portion 40a and the second insulating portion 40b that insulate the coil end portion 32 protruding from the stator core 31.

  This interlayer insulation 40 is constituted by one piece as shown in FIG. On the other hand, when each layer is insulated with a plurality of sheets, it protrudes from the circumferential end portions of the first insulating portion and the second insulating portion located at the coil end portion of the interlayer insulation so that the windings do not contact each other. However, since the amount of the insulating material used is increased because the overlap of the ears must be increased, the interlayer insulation 40 according to the present embodiment is composed of a single sheet, so there is only one overlapping part of the interlayer insulation 40. The amount of insulating material used can be greatly reduced. In addition, the contact between the windings between the layers is reduced, and insulation failure can be reduced.

  Further, in the present embodiment, in order to reduce the overlap of the interlayer insulation 40 as much as possible and to reduce the material cost, from both ends in the circumferential direction of the first insulation portion and the second insulation portion in the coil end portions 32 and 33 of the interlayer insulation 40. One of the protruding ears 40aa and 40bb is lost, and only one ear 40a and 40bb on the opposite side is provided. Thereby, the usage-amount of the material of the interlayer insulation 40 can be reduced, and the contact between windings can also be prevented. Further, since one of the ear portions 40aa and 40bb is not provided, it is possible to reduce time and effort for removing excessive protrusion of the interlayer insulation 40 from the coil end portions 32 and 33.

  Moreover, when one leg part 40aa, 40bb exists, when inserting the leg part 40X of the interlayer insulation 40 in the slot 34 of the stator core 31, the ear | edge parts 40aa, 40bb of the circumferential direction edge part of this interlayer insulation 40 are attached. The leg portion 40X of the interlayer insulation 40 can be easily inserted while being pulled. The order in which the legs 40X of the interlayer insulation 40 are inserted into the slots 34 of the stator core 31 is the same as that of the leg 40X of the interlayer insulation 40 where the ears 40aa and 40bb are not present. NO. 10 is inserted and the last leg 40X NO. 10 is inserted, the ears 40aa and 40bb at the end in the circumferential direction of the interlayer insulation 40 protrude and protrude, so that the ears 40aa and 40bb can be inserted while being pulled. Can be easily inserted and workability can be improved.

  After the outer layer coil 36a is inserted into the slot 34 of the stator 30, the leg portion 40X of the interlayer insulation 40 is inserted into the slot 34 located at both ends of the split of the winding 36 of the intermediate layer coil 36b to be inserted next. Yes. In FIG. 3, after A1, B1, C1, and D1 of the outer layer coil 36a are inserted, the NO. Of the slot 34 located at both ends of the split of the winding 36 of the middle layer coil 36b to be inserted next. 8 and 9 are the NO. 1, 2 and slot 34 NO. 14 and 15, NO. 3, 4 and slot 34 NO. 20 and 21, NO. 5, 6 and the NO. 7, 8 and the slot 34 NO. 8 and 9 are the NO. 9 and 10 are inserted so as to overlap.

  Next, A2, B2, C2, and D2 of the middle layer coil 36b are inserted. No. of leg 40X. 1, 2 and NO. No. 9 of the slot 34 of the stator 30 in which 9 and 10 are inserted. 8 and 9, the winding bundles D2b and A2a of the split portion of the middle layer coil 36b are inserted, and the NO. No. 3 of the slot 34 of the stator 30 in which 3 and 4 are inserted. 14, 15 are inserted with winding bundles A2b and B2a at the split portion of the middle layer coil 36b, and the NO. No. 5 of the slot 34 of the stator 30 in which 5 and 6 are inserted. 20 and 21, winding bundles B2b and C2a of the split portion of the middle layer coil 36b are inserted, and the NO. No. 7 of the slot 34 of the stator 30 in which 7 and 8 are inserted. In 2 and 3, winding bundles C2b and D2a of the split portion of the middle layer coil 36b are inserted.

  Thus, by inserting the leg portions 40X of the interlayer insulation 40 into the slots 34 positioned at both ends of the winding 36 of the middle layer coil 36b inserted inside the outer layer coil 36a inserted into the slot 34, the middle layer The interlayer insulation 40 is lifted (wound up) by the insertion pressure when the coil 36b is inserted into the slot 34, and the outer layer coil 36a and the middle layer coil 36b do not come into contact with each other to cause insulation failure. Further, by inserting the leg portion 40X into the slot 34 located at both ends of the split, the leg portion 40X of the interlayer insulation 40 is not cut off and brought into contact by the insertion pressure for inserting the middle layer coil 36b into the slot 34.

  Similarly, the leg portions 50X of the interlayer insulation 50 have slots 34 positioned at both ends of the split portion of the winding 36 of the inner layer coil 36c to be inserted next after the middle layer coil 36b is inserted into the slot 34 of the stator 30. Is inserted. In FIG. 3, after A2, B2, C2, and D2 of the middle layer coil 36b are inserted, the NO. Of the slot 34 located at both ends of the split of the winding 36 of the inner layer coil 36c to be inserted next. 10 and 11 are the NO. 11, 12 and slot 34 NO. 16 and 17, the leg 50X NO. 13, 14 and slot 34 NO. 22 and 23, NO. 15, 16 and the NO.4 of the slot 34 and the NO. 17 and 18 and the slot 34 NO. 10 and 11 are the NO. 19 and 20 are inserted so as to overlap.

  Next, A3, B3, C3 and D3 of the inner layer coil 36c are inserted. NO. Of leg 50X. 11, 12 and NO. No. 19 of the slot 34 of the stator 30 in which 19 and 20 are inserted. 10 and 11, the winding bundles D3b and A3a of the split portion of the inner layer coil 36c are inserted, and the NO. No. 13 of the slot 34 of the stator 30 in which 13 and 14 are inserted. 16 and 17, the winding bundles A3b and B3a of the split portion of the inner layer coil 36c are inserted, and the NO. No. 15 of the slot 34 of the stator 30 in which 15 and 16 are inserted. 22 and 23, winding bundles B3b and C3a of the split portion of the inner layer coil 36c are inserted, and the NO. No. 17 of the slot 34 of the stator 30 in which 17 and 18 are inserted. In 4 and 5, winding bundles C3b and D3a of the split portion of the inner layer coil 36c are inserted.

  As described above, the leg portions 50X of the interlayer insulation 50 are always inserted into the slots 34 located at both ends of the winding 36 of the inner layer coil 36c inserted into the middle layer coil 36b inserted into the slot 34. By doing so, the interlayer insulation 50 is lifted (wound up) by the insertion pressure when the inner layer coil 36c is inserted into the slot 34, and the middle layer coil 36b and the inner layer coil 36c do not come into contact with each other to cause insulation failure. Further, the leg portion 50X of the interlayer insulation 50 is not cut off and brought into contact by the insertion pressure for inserting the inner layer coil 36b into the slot 34 by inserting the leg portion 50X into the slots 34 located at both ends of the split.

  In addition, the interlayer insulations 40 and 50 have leg portions 40X and 50X connecting the first insulation portions 40a and 50a and the second insulation portions 40b and 50b to 10 ± 5 mm with respect to the stack thickness of the stator core 31. When the leg portions 40X and 50X of the interlayer insulations 40 and 50 are shorter than 5 mm, it is difficult to insert the leg portions 40X and 50X into the slots 34 of the stator core 31 and the workability is deteriorated. On the contrary, when the leg portions 40X and 50X are longer than 15 mm, the insulating portions 40a and 50a between the layers of the windings 36 of the coil end portions 32 and 33 protruding from the end of the stator 30 are displaced and sufficiently insulated. Will not be able to. Note that the length of the leg portions 40X and 50X is 10 ± 5 mm with respect to the thickness of the stator core 31, so that the first insulating portions 40a and 50a or the second insulating portions 40b from one end face of the stator 30, The length up to 50b is preferably in the range of 2.5 mm to 7.5 mm.

  Further, the first insulating portions 40a and 50a facing the space surrounded by the leg portions 40X and 50X connecting the first insulating portions 40a and 50a of the interlayer insulating 40 and the second insulating portions 40b and 50b. The sides and the sides of the second insulating portions 40b and 50b have stepped shapes 40c and 50c of cutout portions 40d and 50d cut out on the insulating portion side. As a result, when the coil end portions 32 and 33 are formed, excess insulation paper does not protrude from the inner diameter side of the stator 30, and contact between the layers at the rising portion of the winding 36 from the slot 34 can be prevented. Can be improved.

  The notched portions 40d and 50d of the stepped shapes 40c and 50c are surrounded by leg portions 40X and 50X that connect the first insulating portions 40a and 50a of the interlayer insulating layers 40 and 50 and the second insulating portions 40b and 40b. Stepped shapes 40c and 50c are provided with cutout portions 40d and 50d cut out on the insulating portion side from a position that enters the inside of the space portion side by about one slot pitch of the slot pitch of the stator 30. The cutout portion is configured by an arcuate cutout portion 40d, a concave cutout portion 50d, and the like. Further, the cutout portions 40d and 50d may be provided in both the first insulating portions 40a and 50a and the second insulating portions 40b and 50b, but may be provided in either one.

  The notched portions 40d and 50d of the interlayer insulations 40 and 50 are not provided with a notch immediately from the root portion of the portion where the winding 36 is inserted into the slot 34 at the end of the stator core 31 to the insulating portion side. The slot pitch of the stator 30 is approximately 1 toward the space surrounded by the leg portions 40X and 50X connecting the first insulating portions 40a and 50a of the interlayer insulating layers 40 and 50 and the second insulating portions 40b and 50b. Since the stepped shapes 40c and 50c are provided with cutout portions 40d and 50d cut out on the insulating portion side from the position entering the inside of the slot pitch, the winding 36 rises from the slot 34 at the end of the stator core 31. In particular, the leg portions 40X and 50X of the interlayer insulations 40 and 50 when the windings 36 of the respective layers are inserted into the slots 34 of the stator 30 and are largely formed on the outer diameter side of the stator 30 are eliminated. It is possible to reduce the insulation failure due to contact between the layers with each other at the root portion.

  Since the stepped shapes 40c and 50c are provided with cutout portions 40d and 50d cut out on the insulating portion side from the position entering the inside of about one slot pitch, the stepped shapes 40c and 50c are inserted into the next layer. Insulation between layers can be performed at the root portion of the slot 34 of the winding 36 to reduce insulation failure. Further, since the stepped shapes 40c and 50c are provided with cutout portions 40d and 50d cut out on the insulating portion side, when the winding 36 is formed largely on the outer diameter side of the stator 30, the step is formed on the stator inner diameter side. Part of the interlayer insulation 40, 50 does not pop out.

  FIG. 6 shows another embodiment. FIG. 6 shows a three-phase four-pole motor in which a slot insulation 75 is provided in a slot 74 of a stator core 71 of a stator 70 and a winding 76 is inserted. The number of slots is 12 slots. The winding 76 has an outer layer coil 76a in the slot NO. 1, 4, 5 and 8, 9 and 12, and then the inner layer coil 76 c is inserted into the slot NO. Three-phase, four-pole motors inserted in 3 and 6, 7 and 10, 11 and 2. In addition, the external shape of the stator 70 of the electric motor in the present embodiment is almost the same as that in FIG. 1 (see FIG. 1 for the external shape). The windings 76 of the stator 70 use abbreviated winding by the distributed winding method. In this case, U-phase, V-phase, and W-phase are formed on the outer layer coil 76a, and the U-phase, V-phase, and W-phase windings of the inner layer coil 76c are arranged to face each other.

  The winding 76 of the electric motor of this embodiment is one slot and one coil, and the winding 76 wound concentrically by the winding machine in the slot 74 of the stator core 71 is a winding insertion device called an inserter. Is inserted into the slot 74. When the winding 76 is inserted by the winding insertion device, the wedges are inserted at the same time so that the inserted winding bundle does not spill from the slot opening side opened to the inner diameter side of the stator and cause insulation failure.

  In the procedure of inserting the winding 76 into the slot 74 of the stator core 71, the slot insulation 75 is disposed in the slot 74 of the stator core 71, and the outer layer coil 76a is inserted thereon. Next, the coil end portions 72 and 73 protruding from the end face of the stator core 71 of the outer layer coil 76a are formed so as to be greatly opened to the outer diameter side of the stator 70 so that the inner layer coil 76c can be easily inserted. Thereafter, the interlayer insulation 60 is inserted between the outer layer coil 76a and the inner layer coil 76c so as not to contact with the next inserted winding 76 (in this case, the inner layer coil 76c) and cause insulation failure. Finally, the inner layer coil 76c is inserted.

  The leg portion NO. Nos. 61 to 68 indicate the NO. Of slot 74 located at both ends of the winding 76 of the inner layer coil 76c to be inserted next after the outer layer coil 76a is inserted into the slot 74 of the stator 70. No. 2 and 3 no. 61, 62, slot 74 NO. Nos. 63, 64, slot 74 NO. Nos. 10 and 11 are leg numbers. Nos. 65 and 66 and slots Nos. 2 and 3 of the leg 74 67 and 68 are leg numbers. 61 and 62 are inserted so as to overlap each other.

  In this way, in the slots 74 (NO. 2, 3, 6, 7, 10, 11) located at both ends of the winding 76 of the inner layer coil 76c inserted inside the outer layer coil 76a inserted into the slot 74. Leg portion of the interlayer insulation 60. By always inserting 61 to 68, the interlayer insulation 60 is lifted (rolled) by the insertion pressure when the inner layer coil 76c is inserted into the slot 74, and the outer layer coil 76a and the inner layer coil 76c come into contact with each other, resulting in poor insulation. Absent. Further, the leg portion NO. Is inserted into the slot 74 (NO. 2, 3, 6, 7, 10, 11) located at both ends of the split. When the inner layer coil 76c is inserted into the slot 74 by inserting 61 to 68, the leg portion NO. 61 to 68 are not cut and contacted.

  In addition, one end of the circumferential ends of the first insulating portions 40a, 50a and the second insulating portions 40b, 50b of the interlayer insulating layers 40, 50 of the present embodiment is ears 40aa, 50aa, 40bb protruding from the circumferential direction. 50bb is provided, and the other end is not provided with the ears 40aa, 50aa, 40bb, 50bb.

  Further, one end of the circumferential end of the first insulating portions 40a, 50a and the second insulating portions 40b, 50b of the interlayer insulations 40, 50 has ear portions 40aa, 50aa, 40bb, 50bb protruding in the circumferential direction. The other end is provided with the ears 40aa, 50aa, 40bb, 50bb, which are the ends of the interlayer insulations 40, 50, by providing a shape without the ears 40aa, 50aa, 40bb, 50bb. The side that is not present is prevented from jumping out to the inner diameter side of the stator or the outer diameter side of the stator at the end of the interlayer insulation 40, 50 at the dividing portion that is the boundary between the winding 36 and the winding 36. On the side where 50 ears 40aa, 50aa, 40bb, 50bb are provided, the ears 40aa, 50aa, 40bb, 50bb of the interlayer insulation 40, 50 are provided in the slots 34 of the stator core 31. Tsu crawling leg 40X, it is easier to insert the 50X. Further, by using only one of the ear portions 40aa, 50aa, 40bb, 50bb which are the end portions of the interlayer insulations 40, 50, it is possible to obtain a necessary minimum insulating material, and it is possible to reduce the amount of the insulating material used. .

  As described above, the stator 30 of the electric motor according to the present embodiment can reduce the contact failure of the windings 36 between the layers, so that the reliability can be improved and the electric motor can be used as a high-quality electric motor. In particular, it can be used as an electric motor mounted in a compressor of an outdoor unit such as a refrigerator or an air conditioner, or an electric motor for a vehicle.

  Note that polyethylene terephthalate (PET), polyethylene naphthalate (PEN), or the like is used as the material of the interlayer insulation 40, 50, 60 of the electric motor used in this embodiment.

The figure of the stator of the electric motor in this embodiment. The figure seen from the arrow direction F of FIG. The coil arrangement | positioning of this embodiment and the layout of the leg part of interlayer insulation. The outer middle interlayer insulation in this embodiment. Middle inner interlayer insulation in this embodiment. The coil layout of another embodiment and the layout of the leg part of interlayer insulation.

40X, 1-10 ... Legs of interlayer insulation 40 50X, 11-20 ... Legs of interlayer insulation 50 30, 70 ... Stator 31, 71 ... Stator core 31a ... Teeth 31b ... Yoke 32 ... Coil end portion 33 ... Coil end portion 34,74 ... Slot 35,75 ... Slot insulation 36,76 ... Winding 36a, 76a ... Outer layer coil 36b ... middle layer coil 36c, 76c ... inner layer coil A1 to D1 ... outer layer coil A2 to D2 ... middle layer coil A3 to D3 ... inner layer coil A1a to D1a, A1b to D1b, A2a to D2a, A2b-D2b, A3a-D3a, A3b-D3b ... Winding 40 ... Interlayer insulation 40a ... First insulation 40aa ... Ear 40b ... Second insulation 40bb ... ear Part 40c ... Stepped part 40d ... Notch part 50 ... Interlayer insulation 50a ... First insulation part 50aa ... Ear part 50b ... Second insulation part 50bb ... Ear Part 50c ... Stepped part 50d ... Notch part 60 ... Interlayer insulation 61-68 ... Leg part of interlayer insulation 60

Claims (2)

Slots penetrating in the axial direction of the stator core are provided, and windings by a distributed winding method are inserted into the slots,
In the electric motor having an interlayer insulation that forms a coil end portion protruding from both end faces of the stator core in the stator axial direction and insulates each layer of the coil end portion,
The interlayer insulation includes a first insulating portion that insulates a coil end portion protruding from both end faces of the stator core in the stator axial direction, and
A second insulating portion that insulates a coil end portion protruding in the stator axial direction from the end surface of the stator core opposite to the insulating portion;
A leg portion connecting the first insulating portion and the second insulating portion;
The side of the first insulating part and the side of the second insulating part facing the space surrounded by the leg part connecting the first insulating part and the second insulating part of the interlayer insulation It has a stepped shape cut out on both sides or either side of the insulation part side,
The notched stepped shape is formed approximately 1 slot pitch inward at a slot pitch of the stator toward the space surrounded by the side of the first insulating part, the side of the second insulating part, and the leg part. It is a stepped shape cut out from the position where it entered into the insulating part,
The circumferential insulating both ends of the first insulating portion and the second insulating portion of the interlayer insulation are attached to the stator core so that both ends overlap each other,
An electric motor characterized in that said interlayer insulation leg portions are inserted into slots located at both ends of a split portion of a winding of a next layer inserted inside each layer. One end of the circumferential end portions of the first insulating portion and the second insulating portion of the interlayer insulation is provided with an ear portion protruding in the circumferential direction, and the other end is not provided with an ear portion. the electric motor according to claim 1, wherein, characterized in that.

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