JP2012196000A - Electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric motor which ensures insulation between coils by interphase insulation used for a stator of the electric motor, and allows leader lines from coil end portions to be easily drawn out without hindering an operation.SOLUTION: In an electric motor performing insulation between coils of a stator 30 by interphase insulation 70 and 80, the interphase insulation is comprised of belt-like insulation parts for performing insulation between coils protruding from both end surfaces in the axial direction of the stator, and an insulation leg part for connecting the belt-like insulation parts to each other. End portions of the belt-like insulation parts in the circumferential direction of the stator include insulation end portions 70aa, 70ab, 80aa and 80ab extending outside in the circumferential direction of the stator compared to the insulation leg part connecting the belt-like insulation parts and lying on the outermost side in the circumferential direction. The interphase insulation is configured so that in the lengths of the insulation end portions in the circumferential direction, one length is shorter than the other length. The insulation end portions are arranged to be overlapped with each other at an inter-pole part of the coils forming a phase in a plurality of layers of coils. At least one portion of each of leader lines 100a, 100b and 100c from the coil end portions of the coils is drawn out from the side where the length of the insulation end portion is short.

Description

  The present invention relates to an electric motor in which a plurality of layers of windings forming different phases are mounted in slots of a stator of an electric motor, lead wires are drawn out from winding ends of the respective windings, and the windings are insulated by inter-phase insulation.

  Conventionally, as shown in Patent Document 1 (Act No. 7-42208), the structure of interphase insulation that insulates between the windings of a plurality of phases attached to the teeth of the stator of an electric motor is disclosed in US Pat. Insulation between phases is used in which a plurality of windings protruding from both end surfaces in the direction are insulated by respective strip-like insulation portions and connected by a plurality of insulation legs inserted into slots of the stator.

  In Patent Document 1, the width of the band-like insulating portion is arranged with a difference in height between the wide width portion and the narrow width portion in accordance with the winding height of the winding protruding from both axial end surfaces of the stator, thereby extremely protruding. This eliminates the need to cut the strip-shaped insulating portion to reduce the number of work steps. Moreover, the damage to the windings generated by the winding process during the cutting operation is reduced and the quality is improved.

No. 7-42208

  Such an interphase insulation structure of an electric motor is an optimal structure for insulating multiple windings protruding from both ends of the stator in the axial direction by mounting multiple layers of windings on the stator. Have. However, the shape of the interphase insulation is not considered in consideration of the position of the lead wire drawn from the winding end of the winding wound around the stator tooth portion and the arrangement of the lead wire, and the winding of the stator winding When drawing out the lead line from the end of the line, depending on the drawing position of the lead line and the arrangement of the lead line, the shape of the interphase insulation becomes a problem, and the lead line is hindered.

  Specifically, the lead wire drawn out from the winding end is routed so as to intersect with the winding wound around the teeth of the stator, and the stator winding is specified by compression shaping. When putting in the dimensions, the insulation coating of the winding and the lead wire or the insulation tube covering the lead wire is crushed and damaged. As a result, insulation failure occurs and quality is degraded.

  Also, when interphase insulation is mounted between the plurality of windings of the stator, the mounting direction of the interphase insulation is wrong, and the windings cannot be reliably insulated, resulting in poor insulation.

In the electric motor in which a plurality of layers of windings forming different phases are mounted in the slots of the stator, the lead wires are drawn out from the winding ends of the windings, and the windings are insulated by interphase insulation.
The interphase insulation includes a strip-shaped insulating portion that insulates between windings protruding from both axial end surfaces of the stator, and an insulation that is inserted through the stator slot and the strip-shaped insulating portions are connected by a plurality of insulating legs. Consists of legs,
The stator circumferential end of the strip-shaped insulating portion has at least one insulating end extending outward in the stator circumferential direction from the insulating leg positioned on the outermost circumferential side connecting the strip-shaped insulating portions. The length of the insulating end in the circumferential direction is interphase insulation in which one length is shorter than the other length,
The insulating end portion of the strip-shaped insulating portion is arranged so as to overlap with an inter-electrode portion of a winding forming one phase of a plurality of winding layers,
An electric motor in which at least one lead wire from the winding end of the winding is drawn from the side where the length of the insulating end is short is used.

In addition, the insulating legs of the interphase insulation are inserted into stator slots located on both sides of the interpolar part of the winding forming one phase of the plurality of layers of windings, thereby insulating the strip-like insulating part. Arrange so that the end overlaps the inter-electrode part,
An electric motor in which at least one lead wire from the winding end of the winding is drawn from the side where the length of the insulating end is short is used.

  Further, the motor is provided with a mark for determining an overlapping order when the insulating end portion of the strip-like insulating portion is overlapped with the inter-electrode portion at the end portion in the stator circumferential direction of the insulating end portion. .

  The interphase insulation used in the electric motor of the present invention is provided with a plurality of layers of windings forming different phases in the slots of the stator, and the interphase between the motor windings from which the lead wires drawn out from the winding ends are drawn out. It can be reliably insulated.

  In addition, the interphase insulation used in the electric motor of the present invention has a winding in which the shape of the interphase insulation protrudes from both axial end surfaces of the stator when the windings mounted in the stator slots are insulated by the strip-shaped insulating portion. A strip-shaped insulating portion that insulates between the wires, and an insulating leg portion that connects the strip-shaped insulating portions with a plurality of insulating legs that are inserted through the slots of the stator.

  The stator circumferential end of the strip-shaped insulating portion has at least one insulating end extending outward in the stator circumferential direction from the insulating leg located on the outermost circumferential direction connecting the strip-shaped insulating portions, The length of the insulating end in the circumferential direction uses interphase insulation in which one length is shorter than the other, and the insulating end of the belt-like insulating portion forms one phase of the multiple layers of windings. They are arranged so that they overlap at the inter-winding part of the winding.

  Thus, when at least one lead wire is pulled out from the winding end portion mounted in the slot of the stator, the insulating end portion of the interphase insulation does not get in the way and the lead wire cannot be routed or arranged. Moreover, since the lead wire is drawn from the side where the length of the insulating end portion is short, the lead wire is not drawn over the interphase insulation arranged between the windings in the radial direction. In addition, since it is less likely that the lead wire intersects perpendicularly to the winding wound around the teeth of the stator, when the stator winding is compressed and put into the specified dimensions, the winding, lead wire, etc. It is possible to obtain an electric motor excellent in quality that does not cause insulation failure by crushing the insulating tube covered with the insulating coating or the lead wire.

  The at least one insulating end may be provided in the strip insulation on both sides in the stator axial direction of the strip insulation that insulates between the windings protruding from both ends in the stator axial direction of the interphase insulation, You may provide in either one. Moreover, you may provide in the both sides of the stator circumferential direction of a strip | belt-shaped insulation part, and you may provide in either one. Note that the length in the stator circumferential direction of the insulating end portion of the strip-like insulating portion is determined by the drawing position of the lead wire drawn from the winding end portion of the winding.

  In addition, interphase insulation in which one insulating end is shorter than the other length requires that the length of the insulating end is longer than the other and that the other of the insulating ends is insulated. Including the case where one end has one end and one has no insulating end. Alternatively, interphase insulation in which the length of the other end of the insulating end is shorter than the length of the other one is only required if the length of the insulating end is longer than the other length, and one of the insulating ends is insulated. It includes an end portion and the other case without an insulating end portion.

  Also, the insulation legs of the interphase insulation are inserted into the slots of the stator located on both sides of the interpolar part of the winding forming one phase of the multiple layers of windings, and the insulation end of the belt-like insulation part is the pole It arrange | positions so that it may overlap in the intermediate part, and at least 1 lead-out line of the coil | winding end part is withdraw | derived from the side with the short length of the insulation edge part of phase insulation.

  As a result, the circumferential end of the strip-shaped insulating portion that insulates between the windings protruding from both axial end surfaces of the stator overlaps with the circumferential insulating end of the strip-shaped insulating portion, and is inserted through the slot of the stator. By connecting with the insulation legs, after winding the stator winding with an external winding machine, the insertion pressure when inserting the winding into the slot of the stator and the axial jump out of both ends of the stator When the compressed winding is compressed and shaped to the specified dimensions, the insulation end of the interphase insulation is not caught in and jumped out, preventing contact between the lead wire and the winding due to the lead wire drawing position from the winding end, Insulation failure can be reduced.

  Furthermore, by changing the overlap of the insulation end in the circumferential direction of the strip insulation part so as not to interfere with the drawing and placement of the lead line, the lead line can be easily routed and the lead line and the winding intersect at right angles. As much as possible, even if the winding protruding from both ends of the stator axial direction is compressed and shaped, the insulation coating on the winding and the lead wire, or the insulation tube covered on the lead wire is crushed, resulting in poor insulation It can be set as the motor excellent in the quality which does not become.

  Further, in the present invention, the insulating end portion in the stator circumferential direction of the belt-like insulating portion is provided with a mark for determining the overlapping order of the long side and the short side of the belt-like insulating portion in the stator circumferential direction. ing. For example, it is possible to clearly determine the overlapping order of the band-shaped insulating portions by providing a recess in which a part of the insulating end of the band-shaped insulating portion in the circumferential direction of the stator is notched. The mark is not limited to the above-described method, but may be a protruding part protruding partly, and the place where the mark is provided may be provided on the insulating leg. The mark is not limited to this.

  This makes it possible to clearly determine the overlapping order of the insulating end portions extending in the stator circumferential direction of the strip-shaped insulating portion when the winding is attached to the slot of the stator and the interphase insulation is attached.

  The interphase insulation used in the present embodiment is constituted by one interphase insulation between a plurality of layers of windings forming different phases, but the same is true even if a plurality of interphase insulations are mounted between each winding. The order of overlap can be determined.

  Further, by using the electric motor for a compressor mounted in a compressor as a driving source for a refrigerator, an air conditioner or the like, it is possible to use an electric motor that reliably insulates windings inserted in a plurality of phases into a stator slot, It can be set as the compressor which reduced the insulation defect.

The electric motor of this embodiment. FIG. 2 is a schematic layout diagram in which interphase insulation is disposed between windings of the electric motor illustrated in FIG. 1. The schematic diagram of the coil | winding arrange | positioned at the slot of the stator shown in FIG. The figure of the interphase insulation 70 used for this embodiment. The figure of the interphase insulation 80 used for this embodiment.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an electric motor according to the present embodiment. In FIG. 1, a winding 32 is mounted in a slot 31 of the stator 30. In the method of attaching the winding 32 to the slot 31 of the stator 30, a winding ring is formed by an external winding machine, and the winding ring is inserted and attached to the slot 31 of the stator 30 by a winding insertion machine. Lead wires U, V, W and X, Y, Z are drawn out at one end of the winding end inserted into the slot 31 of the stator 30.

  In the present embodiment, the lead wires U, V, W drawn from the winding end of the winding 32 of the stator 30 are lead wires connected to the power supply side, and the lead wires U, V, W are directly connected to the lead wire. It is drawn as a line. The lead wires U, V, and W employ a well-known direct drawing system in which an insulating tube is put on a winding end and a terminal is directly crimped on the winding end. Then, after the terminals are crimped to the lead lines U, V, and W, the cluster 100 is mounted. In addition, the lead wires X, Y, and Z drawn from the other end of the winding end are covered with an insulating tube, and the winding ends are connected together to form a neutral point 90. Forming.

  As shown in FIGS. 1 and 2, the windings 32 inserted in the slots 31 of the stator 30 of the present embodiment constitute three phases and are distributed in a plurality of layers so that the phases are different from each other. This is a three-phase induction motor in which a wound winding 32 is inserted. Interphase insulation 70 and 80 is mounted between the windings so that each layer does not come into contact with each other and insulation failure occurs. In addition, the electric motor in the present embodiment has a three-phase 1Y connection and forms four poles (two poles for the counter electrode).

  Interphase insulation 70, 80 includes strip-shaped insulating portions 70a, 70b (see FIG. 4) and 80a, 80b (see FIG. 5) that insulate between windings protruding from both axial end surfaces of the stator 30, and the strip-shaped insulating portions. They are connected to each other by a plurality of insulating legs 70d and 80d inserted through the slots 31 of the stator 30. The interphase insulation 70 and 80 of this embodiment insulates the different phases between the windings mounted in the slot 31 of the stator 30 with a single interphase insulating film. By using a single insulating film as the interphase insulation, it is possible to ease the work of inserting many insulating legs into the slot 31 when mounting a plurality of interphase insulations in the slot 31 of the stator 30. In addition, as a material of the interphase insulating film, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethylene sulfide (PPS), aramid, and an insulating film obtained by bonding these materials are used.

  In the electric motor shown in FIG. 1, a U-phase winding is arranged as the outer layer winding 40 on the radial direction and outermost circumferential side of the slot 31 of the stator 30, and then a W-phase winding is arranged as the middle layer winding 50. The V-phase winding is disposed as the inner layer winding 60 on the innermost peripheral side. The stator 30 of this embodiment shown in FIG. 1 has 24 slots, and the numbers shown on the inner diameter side of the stator in the figure indicate the slot numbers. The windings 32 attached to the slots 31 of the stator 30 connect the windings 32 attached to each layer to form a three-phase four-pole 1Y.

  FIG. 3 is a developed view schematically showing the connection of the winding 32 wound around the slot 31 of the stator 30 shown in FIGS. 1 and 2. The slot numbers of the stator 30 shown in FIG. 3 are the same as the slot numbers shown in FIGS.

The arrangement of the windings 32 attached to the slots 31 of the stator 30 of this embodiment and the arrangement of the interphase insulations 70 and 80 will be described with reference to FIGS.
First, an externally wound winding ring is inserted into the slot 31 of the stator 30 as an outer layer winding 40 by a winding insertion machine on the outermost peripheral side of the slot 31 of the stator 30. The outer layer winding 40 inserted in the outer layer of the stator 30 constitutes a U-phase winding. The U-phase winding is the slot number NO. 1-6, NO. 7-12, NO. 13-18, NO. 19 to 24 are arranged. In addition, NO. 6 and NO. 7, NO. 12 and NO. 13, NO. 18 and NO. 19, NO. 24 and NO. Between 1 is the gap between the U phases.

  Next, the interphase insulation 70 is attached after the outer layer winding 40 is attached to the slot 31 of the stator 30. Insulation legs 70 d of the interphase insulation 70 are inserted from the openings on the stator inner diameter side of the slots 31 of the stator 30. The position of the insulating leg 70d in the slot of the stator 30 is the mark 70c (one provided on one of the insulating end portions extending in the circumferential direction of the stator 30 of the band-like insulating portions 70a and 70b of the interphase insulation 70 (see FIG. 4). 2 are inserted into the slots 31 of the stator 30 from 8a and 9a of the insulating leg 70d on the insulating end 70ab side. Stator 30 slot number NO. Insulating legs 8a, 9a, 14a, 15a, 20a, 21a, 2a, 3a are inserted into the slot 31 in the order of 8, 9, 14, 15, 20, 21, 2, 3, and finally, the NO. 8 and 9 are arranged so that 8b and 9b of the insulating leg 70d overlap.

  The interphase insulation 70 mounted between the outer layer winding 40 and the middle layer winding 50 is an inter-pole portion of the W phase winding, which is the middle layer winding 50, and fixes the band-like insulation portions 70a and 70b of the interphase insulation 70. The insulating end portions 70aa and 70ab and 70ba and 70bb extending in the child circumferential direction are arranged so as to overlap each other.

  In this embodiment, the insulating end portions 70aa and 70ab of the strip-like insulating portion 70a are overlapped with each other on the insulating end portion 70ab side having a mark 70c provided on one side of the insulating end portion 70ab and shorter on the insulating end portion 70aa side. Alternatively, the insulating legs 8a and 9a on the side where there is no insulating end 70ab are inserted into the slots 31 of the stator 30 in order, and the last insulating legs 8b and 9b are inserted into the first insulating legs 8a and 9a. So that the longer end of the insulating end provided on the other side of the insulating end overlaps. The overlapping method of the insulating end portions 70ba and 70bb of the strip-shaped insulation 70b is the same as that of the insulating end portion 70ab of the strip-shaped insulating portion 70a.

  Next, after interphase insulation 70 is mounted on the slot 31 of the stator 30 on the U-phase winding of the outer layer winding 40, the middle layer winding 50 is inserted into the slot 31 of the stator 30 by a winding insertion machine. Yes. The middle layer winding 50 inserted in the middle layer of the stator 30 constitutes a W phase winding. The W-phase winding is the slot number NO. 3-8, NO. 9-14, NO. 15-20, NO. 21 to 2 are arranged. In addition, NO. 8 and NO. 9, NO. 14 and NO. 15, NO. 20 and NO. 21, NO. 2 and NO. Between 3 is the gap between the W phases.

  Next, the interphase insulation 80 is mounted on the slot 31 of the stator 30 after the middle layer winding 50 is mounted. Insulation legs 80 d of the interphase insulation 80 are inserted from the openings on the stator inner diameter side of the slots 31 of the stator 30. The positions of the insulating legs 80d in the slots of the stator 30 are the marks 80c provided on one of the end portions of the insulating strips 80a and 80b of the interphase insulation 80 (see FIG. 5) extending in the circumferential direction of the stator 30. 2 are inserted into the slots 31 of the stator 30 from 10a and 11a of the insulating leg 80d on the insulating end 80aa side. Stator 30 slot number NO. Insulating legs 10a, 11a, 16a, 17a, 22a, 23a, 4a, 5a are inserted in this order in the order of 10, 11, 16, 17, 22, 23, 4, 5, and finally, the NO. 10 and 11 are arranged such that 10b and 11b of the insulating leg 80d overlap.

  The interphase insulation 80 mounted between the intermediate layer winding 50 and the inner layer winding 60 is an inter-pole portion of the V phase winding that is the inner layer winding 60 and fixes the band-shaped insulating portions 80a and 80b of the interphase insulation 80. The insulating end portions 80aa and 80ab and 80ba and 80bb extending in the circumferential direction are arranged so as to overlap each other.

  In this embodiment, the insulation ends 80aa and 80ab of the strip-like insulation 80a are overlapped with each other on the insulation end 80aa side having the mark 80c provided on the other side of the insulation end 80aa. The leg portions 10a and 11a are inserted into the slots 31 of the stator 30 in order, and the last insulating legs 10b and 11b are inserted so as to overlap the first inserted insulating legs 10a and 11a, and one end of the insulating end portion is inserted. The side where the length of the insulating end provided on the side is short or the side where there is no insulating end is overlapped. The overlapping method of the insulating end portions 80ba and 80bb of the strip-shaped insulating member 80b is the same as that of the insulating end portion 80aa of the strip-shaped insulating portion 80a.

  Next, after interphase insulation 80 is mounted on the slot 31 of the stator 30 on the W-phase winding of the middle layer winding 50, the inner layer winding 60 is inserted into the slot 31 of the stator 30 by a winding insertion machine. Yes. The inner layer winding 60 inserted into the inner layer of the stator 30 constitutes a V-phase winding. The V-phase winding is the slot number NO. 5-10, NO. 11-16, NO. 17-22, NO. 23 to 4 are arranged. In addition, NO. 10 and NO. 11, NO. 16 and NO. 17, NO. 22 and NO. 23, NO. 4 and NO. Between 5 is the gap between the V phases.

  The winding ends of the windings 32 attached to the slots 31 of the stator 30 are the lead wires U, V, and W drawn directly from one winding end portion, which are covered with an insulating tube and have terminals connected to the power supply side. A well-known direct delivery method that is directly caulked is adopted. Then, after the terminals are caulked directly to the lead wires U, V, W, the cluster 100 is mounted and integrated. Lead wires X, Y, and Z are drawn from the winding end of the other winding 32, and are covered with an insulating tube in the same manner as the lead wires U, V, and W, and the winding ends are combined into one. A neutral point 90 is formed to provide a three-phase four-pole 1Y connection.

  In the stator of this embodiment, the slot number NO. A lead wire drawn from one end of the U phase from one outer layer is covered with an insulating tube to directly crimp a terminal as a lead wire. Also, the slot number NO. A lead wire X drawn from the other winding end of the U phase from the outer layer 7 is covered with an insulating tube, and connected to the lead wires Y and Z at the other winding end to make a neutral point.

  Similarly, the slot number NO. A lead wire drawn from one end of the W-phase winding from the middle layer of 9 is covered with an insulating tube to directly crimp the terminal as a lead wire. Also, the slot number NO. An insulation tube is placed on the lead wire Z drawn from the other winding end of the W phase from the middle layer of 15 and is connected to the lead wires X and Y at the other winding end to make a neutral point.

  Also, the slot number NO. The lead wire V drawn from one end of the V-phase winding from the inner layer 5 is covered with an insulating tube to directly crimp the terminal as a lead wire. Also, the slot number NO. An insulation tube is put on the lead wire Y drawn from the other winding end of the V phase from the inner layer of 11 and connected to the lead wires X and Z at the other winding end to make a neutral point.

  As shown in FIG. 2, the neutral point connection point 90 is buried between the middle layer winding and the inner layer winding in a substantially interpolar portion of the inner layer winding. In FIG. 5 and NO. 4, the connection point 90 is embedded.

  Here, as shown in FIG. The lead wire X drawn out from the outer layer 7 is drawn out to the insulating end portion 70ab because there is no insulating end portion 70ab extending in the stator circumferential direction of the strip-like insulating portion 70a of the interphase insulation 70 attached between the outer layer and the inner layer. The lead wire X can be easily pulled out from the end of the winding wire without disturbing the lead-out of the wire X. When the lead wire X is routed at the upper end of the winding, the slot No. 7 can be drawn between the outer layer and middle layer windings so as to sew the interphase insulation 70 in the circumferential direction of the stator 30, so that the windings and the drawing line intersect and the stator axial direction When compressing and shaping a winding that protrudes from both ends, the insulation must not be crushed by insulation coating on the winding or the lead wire, or the insulation tube on the lead wire. it can.

  First, the interphase insulation 70 mounted in the stator slot has a short side on the side of the insulating end 70ab having a mark 70c provided on one side of the insulating end 70ab, or a side where there is no insulating end 70ab. Insulating legs 70d are inserted into slot numbers No. 8 and 9 of slots 31 located on both sides of the interpolar part of the winding 32 forming the W phase of the middle layer in order from 8a and 9a, and finally, the insulating legs 8b and 9b are inserted so as to overlap with the first insulating legs 8a and 9a inserted in the slots 31 located on both sides of the inter-electrode portion. Thereby, the outer layer winding 40 and the middle layer winding 50 can be surely insulated, and the insertion pressure of the winding insertion machine when the winding 32 is mounted in the slot 31 of the stator 30, the stator The winding 32 that protrudes from both ends in the axial direction 30 is prevented from coming into contact due to displacement or breakage of the interphase insulation 70 due to expansion or contraction when the compression shaping is performed.

  In addition, as shown in FIG. The lead wire Y drawn from the inner layer 11 is drawn to the insulating end 80ab because there is no insulating end 80ab extending in the circumferential direction of the stator of the strip-like insulating portion 80a of the interphase insulation 80 mounted between the middle layer and the inner layer. The lead wire Y can be easily pulled out from the end of the winding wire without disturbing the lead-out of the wire Y. When the lead wire Y is routed at the upper end of the winding, the slot No. 11 can be drawn so as to sew the interphase insulation 80 in the circumferential direction of the stator 30 between the windings of the middle layer and the inner layer, so that the winding and the drawing line intersect, and the axial direction of the stator When compressing and shaping a winding that protrudes from both ends, the insulation must not be crushed by insulation coating on the winding or the lead wire, or the insulation tube on the lead wire. it can.

  First, the interphase insulation 80 attached to the slot of the stator is separated from the insulation legs 80a on the side of the insulation end 80aa having the mark 80c provided on the other side of the insulation end 80aa, and the insulation legs 80a on the longer side. The slot numbers of the slots 31 located on both sides of the interpolar portion of the winding 32 forming the V phase of the inner layer in order. 10 and 11, and finally, the insulating legs 10 b and 11 b are inserted so as to overlap the first insulating legs 10 a and 11 a inserted in the slots 31 located on both sides of the interpolar part. Thereby, the middle layer winding 50 and the inner layer winding 60 can be reliably insulated, and the insertion pressure of the winding insertion machine when the winding 32 is mounted in the slot 31 of the stator 30 and the stator The winding 32 protruding from both ends in the axial direction 30 is prevented from coming into contact due to the displacement or breakage of the interphase insulation 80 due to expansion or contraction when the compression shaping is performed.

  As described above, the length in the stator circumferential direction is equal to the insulation end portions 70ab and 80aa in the stator circumferential direction of the strip-shaped insulation portions 70a and 80a of the interphase insulation 70 in FIG. 4 and the interphase insulation 80 in FIG. By providing concave marks 70c and 80c for determining the overlapping order of the long side and the short side, the winding 32 is attached to the slot 31 of the stator 30, and the belt-like shape when the interphase insulations 70 and 80 are attached. The order of the overlapping of the insulating end portions 70aa, 70ab and 80aa, 80ab extending in the stator circumferential direction of the insulating portions 70a, 80a can be clearly determined, and the interphase insulation 70, between the plurality of windings of the stator 30, When mounting 80, there is no mistake in the mounting direction of the interphase insulation 70, 80, and the windings can be reliably insulated.

  Further, by using these interphase insulating structures 70 and 80, the windings inserted into the slots 31 of the stator 30 in a plurality of phases can be reliably insulated, and the winding ends attached to the slots 31 of the stator 30 can be reliably insulated. The lead wire drawn out from the section can be pulled out easily, without causing any trouble to the work, and it is possible to reduce the crossing of the winding 32 and the lead wire as much as possible and to reduce the insulation failure. . Thereby, it can use as the stator 30 of the electric motor mounted in a compressor as drive sources, such as a refrigerator and an air-conditioner.

1 to 24 ··· Slot number 1a to 24a, 8b, 9b, 10b, 11b ··· Insulating leg portion 30 ··· Stator 40 · · · Outer layer winding (U phase winding)
50 ... Middle layer winding (W phase winding)
60 ... Inner layer winding (V phase winding)
70, 80 ... Interphase insulation 70a, 70b, 80a, 80b ... Strip-like insulation part 70aa, 70ab, 70ba, 70bb, 80aa, 80ab, 80ba, 80bb ... ... Insulation end part 70c, 80c ... mark (Concave)
70d, 80d ... Insulating leg 90 ... Connection point 100a, 100b, 100c ... Lead wire covered with insulating tube 100 ... Cluster

Claims (3)

In the electric motor in which a plurality of layers of windings forming different phases are mounted in the slots of the stator, the lead wires are drawn out from the winding ends of the windings, and the windings are insulated by interphase insulation.
The interphase insulation includes a strip-shaped insulating portion that insulates between windings protruding from both axial end surfaces of the stator, and an insulation that is inserted through the stator slot and the strip-shaped insulating portions are connected by a plurality of insulating legs. Consists of legs,
The stator circumferential end of the strip-shaped insulating portion has at least one insulating end extending outward in the stator circumferential direction from the insulating leg positioned on the outermost circumferential side connecting the strip-shaped insulating portions. The length of the insulating end in the circumferential direction is interphase insulation in which one length is shorter than the other length,
The insulating end portion of the strip-shaped insulating portion is arranged so as to overlap with an inter-electrode portion of a winding forming one phase of a plurality of winding layers,
An electric motor characterized in that at least one lead wire from the winding end of the winding is drawn out from the side where the length of the insulating end is short. The insulating legs of the interphase insulation are inserted into the slots of the stator located on both sides of the interpolar part of the winding forming one phase of the plurality of layers of windings, and the insulating end of the strip insulating part Are arranged so as to overlap at the interelectrode part,
The electric motor according to claim 1, wherein at least one lead wire from the winding end of the winding is led out from the side where the length of the insulating end is short.   In the stator circumferential direction end of the insulating end portion, a mark for determining an overlapping order when the insulating end portion of the strip-like insulating portion overlaps with the inter-electrode portion is provided. The electric motor according to claim 1 or claim 2.

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