JP5456375B2 - Electric motor - Google Patents

Description

The present invention relates to an electric motor of the concentrated winding type wound directly winding through the resin insulating end plate to the teeth of the stator.

Conventionally, as such an electric motor, there exists an electric motor as shown in patent document 1 (Unexamined-Japanese-Patent No. 2008-42959). Patent Document 1, a resin insulating end plate is mounted at both ends in the stacking direction of the stator, through said resin insulating end plate wrapped directly winding the teeth of the stator, the resin insulating end plate A winding body , an outer diameter resin wall extending from a portion of the winding body on the stator outer diameter side opposite to the stator end face side, and a stator body, and fixing the winding body An inner diameter resin wall extending in the stator lamination direction opposite to the stator end face side from the inner diameter side portion of the stator, and the inner diameter resin wall extends in the stator circumferential direction along the stator inner diameter. There is described an electric motor provided with a notch in which the end face side of the stator is notched in the circumferential direction of the stator.

JP 2008-42959 A

Conventionally, when a high-performance motor is used in an electric motor used for an air conditioner or a compressor of a refrigerator, a winding is wound around a slot of the stator of the motor at a high space factor (ratio of the winding in the slot). In particular, in a concentrated winding type motor in which windings are wound directly on the teeth of the stator , it is important how to wind a large number of windings around the teeth of the stator and pack them in slots without gaps to achieve a high space factor. It has become.

  Therefore, in order to wind the winding around the teeth of the stator without any gap, the winding is strongly pulled by a tension device in the winding machine without any gap. The problem here is that pulling the winding strongly may damage the coating of the winding and cause insulation failure. Since the stator of such an electric motor cannot be made into a product, it can only be scrapped or removed from the teeth of the stator by removing the winding causing the insulation failure and rewinding the winding again. In this case, considering the production cost of the motor, material costs, environmental issues, etc., remove only the winding that caused the insulation failure from the tooth portion of the latter stator and rewind the winding to the tooth portion of the stator again. Often a method is taken.

On the other hand, when removing the winding 30 that has caused the insulation failure from the stator of the electric motor shown in Patent Document 1 or the tooth portion of the electric motor stator 10 shown in FIG. The winding 30 is caught by a corner portion 87 of a notch 88 in which a stator end surface side of an inner diameter flange 83 extending in the circumferential direction of the stator along the stator inner diameter is cut out in the circumferential direction of the stator. The operation of removing the winding 30 from the tooth portion of the stator 10 takes time and significantly deteriorates the operation. In FIG. 9, for convenience of explanation, the winding 30 in the slot is omitted for convenience.

  In this application, in the high-performance electric motor that requires a high space factor, many windings 30 are wound around the teeth of the stator 10, and the coating of the winding 30 is scratched by the winding machine or the like. However, it is possible to quickly remove the defective winding 30 from the tooth portion of the stator 10 and apply a new winding 30, which reduces the defective insulation and improves the quality with a high space factor. An electric motor having a resin insulation structure is provided.

A stator in which a plurality of thin electromagnetic steel plates are laminated and fixed integrally, a resin end plate attached to both ends in the stator stacking direction, and directly to the teeth of the stator via the resin insulating end plate In an electric motor having a wound winding and a rotor that rotates on the inner diameter side of the stator,
The resin insulating end plate includes a winding body, an outer diameter resin wall extending from a portion of the winding body on the stator outer diameter side in a stator lamination direction opposite to the stator end surface, and the winding An inner diameter resin wall extending in the stator lamination direction opposite to the stator end face side from the stator inner diameter side portion of the wire body,
The inner diameter resin wall has an inner diameter flange that extends in the circumferential direction of the stator along the inner diameter of the stator,
The inner diameter flange portion is provided with a notch portion in which the stator end face side is notched in the circumferential direction of the stator,
The notch part is formed by sequentially forming an end face part facing the stator end face side, and an end face part of the notch part from the end part of the end face part on the slot opening side of the stator in the stator stacking direction. The electric motor is composed of a side surface portion that reduces the depth in the circumferential direction of the stator.

  Further, by covering the slot of the stator with a film-like slot insulating paper, it is possible to provide an electric motor capable of winding with a high space factor.

Furthermore, in order to insulate between the windings of the motor having a high space factor by concentrating the windings on each tooth portion of the stator, interphase insulation interposed between the windings is provided. The interphase insulating is an insulating member which cross section is formed in a substantially V-shaped as viewed from the stator lamination direction after interposed between the windings cross sectional shape of the phase insulation, formed into a substantially V-shaped The opening side of the stator faces each slot opening of the stator, and is fixed in the opposite direction to the slot opening of the stator at the opening side end of the substantially V-shaped cross section. A bent portion is provided that is bent in the circumferential direction of the child, and this bent portion is interposed between the tooth portion of the stator and the winding, so that the interphase insulation can be surely prevented from being displaced. Can be placed in between.

Note that the interphase insulation bent portion is locked by the end surface portion constituting the notch portion, so that the interphase insulation can be securely fixed without being displaced due to the vibration of the electric motor or the like.

  By using the electric motor of the present invention, in a high space factor and high performance motor with a large proportion of windings in the stator slots, the winding coating directly wound around the teeth of the stator by a winding machine or the like Even if it is damaged, it is possible to easily remove the winding that has caused poor insulation from the teeth of the stator, and to wind a new winding. With a high space factor, this reduces insulation failure and improves quality. The resin-insulated electric motor can be obtained.

The figure of the electric motor of the embodiment of the present invention. The internal diameter collar part enlarged view of embodiment. The figure explaining the condition which removes the coil | winding of embodiment. The figure explaining the condition which removes the coil | winding of embodiment. The figure explaining the condition which removes the coil | winding of embodiment. The figure in the middle of the interphase insulation of embodiment. The figure after inserting the interphase insulation of embodiment. The enlarged view of the inner diameter collar part and tooth | gear part front-end | tip part of embodiment. The figure of conventional embodiment.

Embodiments of the present invention will be described with reference to the drawings.
The stator 10 of the electric motor shown in FIG. 1 is a fixed structure in which a plurality of electromagnetic steel plates are laminated and the unevenness provided on the adjacent thin electromagnetic steel plates is caulked and fixed together by a known auto-clamp device (automatic caulking device). Child 10. In addition, the stator which laminated | stacked the several thin sheet magnetic steel plate, welded the several location of the stator outer peripheral side, and was integrally fixed may be sufficient.

  Further, the high space factor electric motor of the present embodiment can be used for an electric motor for driving an outdoor unit of an air conditioner or a compressor of a refrigerator, or an electric motor mounted on a vehicle. Although not shown, the rotor of the electric motor of the present embodiment uses an adder-type rotor that is driven to rotate on the inner diameter side of the stator 10.

Further, the winding 30 is directly wound around the tooth portion 50 of the stator 10 by a concentrated winding method . The number of slots of the stator 10 is 6, and the resin insulating end plates 60 are attached to both ends of the stator 10 in the stator lamination direction where the thin electromagnetic steel plates are laminated.

  The resin insulating end plates 60 attached to both ends in the stacking direction of the stator 10 shown in FIG. 1 are composed of an upper resin insulating end plate 60a and a lower resin insulating end plate 60b. The slot of the stator 10 is configured using a film-like slot insulating paper 40 so that many windings 30 of the electric motor can be wound. The slot insulating paper 40 is arranged so as to follow the slot shape of the stator 10 so as to cover the inside of the slot of the tooth tip portion 51 extending in the circumferential direction of the stator tooth portion on the stator inner diameter side of the stator 10. Is arranged.

Upper resin insulating end plate 60a and a lower resin insulating end plate 60b of the resin insulating end plate 60 which is mounted on both ends of the stator 10 shown in FIG. 1, the direct winding 30 in the teeth 50 of the stator outer diameter resin wall 61 winding barrel 69 (see FIGS. 6 to 8), the stator end face of the stator outer diameter side of the winding body portion 69 extending in the opposite stator lamination direction for winding And an inner diameter resin wall 62 extending from the stator inner diameter side of the winding body 69 in the stator lamination direction opposite to the stator end face side. In this embodiment, the upper resin insulating end plate 60a and the lower resin insulating end plate 60b are used as the resin insulating end plate 60. However, in this embodiment, the upper resin insulating end plate 60a ( Hereinafter, only the resin insulating end plate 60 will be described. There is no structural difference between the basic upper resin insulation end plate 60a and the lower resin insulation end plate 60b. In addition, in order to facilitate the description in FIGS. 2 to 8, the winding 30 in the slot is not shown for convenience.

The resin insulating end plate 60 is fixed to both ends of the stator by providing protrusions (not shown) on the side of the resin insulating end plate 60 facing the stator end surface, and fixing both ends of the stator. A groove of a concave portion (not shown) is provided on the child end face side, and the convex portion of the resin insulating end plate 60 and the concave portion on the stator end face side are fitted to each other with a slight tightening margin to fit the resin insulating end plate 60. And the stator 10 are integrally fixed. Thereby, the resin insulation end plate 60 can be reliably fixed to the end portion of the stator.

  The material of the resin insulating end plate 60 is polyamide resin (PA), polyacetal resin (POM), polycarbonate resin (PC), polyethylene naphthalate (PEN), polyethylene sulfide (PPS), liquid crystal polymer (LCP), fluorine. Resins, polyether ether ketone (PEEK), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and the like are used.

As shown in FIG. 1, the inner diameter of the winding body 69 (see FIGS. 6 to 8) of the resin insulating end plate 60 extends from the stator inner diameter side in the stator lamination direction opposite to the stator end face side. The resin wall 62 has an inner diameter flange 63 that extends in the circumferential direction along the inner diameter of the stator . As shown in FIG. 2 of the enlarged inner flange portion, the inner diameter flange portion 63 is provided with a notch portion 64 which is notched in the stator circumferential direction on the stator end face side. The notch portion 64 includes an end surface portion 65 facing the stator end surface side, and a side surface portion 66 in which the depth in the circumferential direction of the notch portion 64 is gradually reduced as the distance from the stator end surface increases. An end surface portion 65 facing the stator end surface side of the notch portion 64 is provided substantially parallel to the stator end surface, and is fixed from the slot opening 52 side of the end surface portion 65 provided substantially parallel to the stator end surface. side portions 66 gradually shallower stator circumferential direction of the depth of the cutout portion 64 formed by cutting the stator circumferential direction with distance from the stator end face opposite is provided with a stator end face side KosekiAtsu direction ing.

  On the other hand, in the conventional high space factor electric motor, since many windings 30 are wound around the teeth 50 of the stator 10 without gaps, the winding force (tension) when winding the windings 30 is very strong. In some cases, the coating of the wire 30 may be damaged, resulting in poor insulation. In this case, in the shape of the resin insulating end plate 80 as shown in FIG. 9, when the winding 30 having poor insulation is removed from the tooth portion 50 of the stator 10, it is caught on the corner portion 87 of the inner diameter flange portion 83. The operation of removing the line 30 is significantly worsened and takes time.

  Therefore, the winding 30 that has been poorly insulated can be easily removed by forming the shape of the inner diameter flange 63 of the resin insulating end plate 60 of the present embodiment shown in FIGS. 1 and 2. Next, with reference to FIG. 3 to FIG.

As shown in FIG. 3, the inner diameter flange portion 63 of the resin insulation end plate 60 is provided with a notch portion 64 in which the stator end face side is notched in the circumferential direction of the stator. An end surface portion 65 whose notch end surface facing the end surface side is substantially parallel to the end surface of the stator, and the circumferential direction of the notch portion 64 as the distance from the end surface of the stator from the slot opening 52 side of the end surface portion 65 increases. by configuring in the side surface portion 66 shallow the depth of the winding 30 without being caught in the corner portion of the inner diameter flange part 63, away winding 30 of the slot opening 52 side, the stator end face Accordingly, it can be smoothly taken to the side surface portion 66 of the resin insulating end plate 60 formed obliquely.

Next, as shown in FIG. 4, the end face of the winding 30 became defective insulation, and substantially parallel to the stator end face by cutting the stator circumferentially facing the stator end face of the inner diameter flange portion 63 It can be smoothly removed from the side surface portion 66 of the resin insulating end plate 60 formed obliquely from 65 to the stator end surface side on the slot opening 52 side.

Furthermore, as shown in FIG. 5, the winding 30 became poor insulation, from the side surface 66 of the resin insulating end plate 60 which is formed obliquely as the distance from the stator end face of the slot opening 52 side, the slot opening It can be removed without being caught by the inner diameter flange 63 on the 52 side.

Therefore, the inner diameter flange portion 63 is provided with a notch portion 64 in which the stator end face side is notched in the stator circumferential direction, and the shape of the notch portion 64 faces the stator end face side and is substantially parallel to the stator end face. An inner diameter composed of a notch end face portion 65 and a side face portion 66 in which the depth of the notch portion 64 is gradually reduced in the circumferential direction of the stator as the end face portion 65 moves away from the stator end face from the slot opening 52 side. By using the flange portion 63, a resin insulation structure is provided in which the winding 30 that has become defective in insulation can be quickly removed from the tooth portion 50 of the stator 10 and a new winding 30 can be wound again.

2, the shape of the notch 64 obtained by notching the stator end face side of the inner diameter flange 63 in the circumferential direction of the stator is such that the notch end face facing the stator end face side is the stator end face. And an end surface portion 65 substantially parallel to the end surface portion 65, and a side surface portion in which the depth in the circumferential direction of the notch portion 64 gradually decreases as the distance from the end surface of the stator increases from the circumferential end portion on the slot opening 52 side of the end surface portion 65. 66, and the inclination angle of the side surface portion 66 is in the range of 0 ° to 90 ° from the end of the notch end surface portion 65 on the slot opening 52 side, which is substantially parallel to the stator end surface . . Further, the shape of the side surface portion 66 may be a substantially flat end surface or a substantially circular arc shape with a slightly inflated curvature on the stator end surface side. As shown in FIG. 9, there is no corner portion 87 on which the winding 30 is caught on the slot opening 52 side of the inner diameter flange 83, so that the work of removing the winding 30 with poor insulation is not deteriorated. That's fine.

Further, in the case of an electric motor with a high space factor, the slots 11 of the stator 10 are covered with film-like slot insulating paper 40 to insulate the inside of the slots 11, so that many windings 30 are connected to the stator 10. Can be wound around the tooth portion 50, and an electric motor with a high space factor can be obtained.

  Further, in the concentrated space type high space factor motor in which the winding 30 is wound directly around the tooth portion 50 of the stator 10, the more windings 30 wound around the adjacent tooth portions 50 are in contact with each other. The wire 30 is wound around the tooth portion 50 of the stator 10. Thereby, although the performance of the electric motor is improved, insulation failure occurs when the windings 30 wound around the adjacent tooth portions 50 come into contact with each other. In the present embodiment, in the high space factor electric motor in which many windings 30 are wound around the tooth portion 50 of the stator 10, as shown in FIGS. 6 to 8, between the windings of adjacent tooth portions 50. Interphase insulation 41 is inserted to ensure insulation.

The embodiment of FIGS . 6 to 8 will be described .
In the slot 11 of the stator 10 shown in FIGS. 6 to 8, the film-like slot insulating paper 40 described above is arranged so as to cover the inside of the slot. The film-shaped slot insulating paper 40 is disposed along the slot shape of the stator 10 and has a tooth tip 51 that extends in the circumferential direction of the tooth 50 of the stator 10 on the stator inner diameter side of the stator 10. It is arranged to cover even the inside of the slot. The slot 11, phase insulation 41 is interposed between the windings 30 wound directly on the tooth portion 50 adjacent.

The interphase insulation 41 has a substantially V-shaped cross section when viewed from the stator lamination direction. In this case, when many windings 30 are directly wound around the tooth portion 50 of the stator 10, the middle part of the interphase insulation 41 shown in FIG. 6 or the interphase insulation 41 shown in FIG. 7 is inserted. In some cases, the apparent cross-sectional shape of the interphase insulation 41 viewed from above in the stator lamination direction may appear to be substantially T-shaped.

The V-shaped opening side in which the cross-sectional shape of the interphase insulation 41 is formed in a substantially V shape is arranged so as to face each slot opening 52 of the stator 10, and the end of the interphase insulation 41 on the V-shaped opening side A bent portion 42 is provided by bending the portion in the stator circumferential direction opposite to the slot opening 52 side.
In the bent portion 42 obtained by bending the end portion on the V-shaped opening side, the inner diameter flange portion 63 extending in the circumferential direction of the stator 10 of the inner diameter resin wall 62 serves as an insertion guide wall, and the distal end portion of the tooth portion of the iron core of the stator 10. It can be inserted and fixed between 51 and the winding 30.

Further, as shown in FIGS. 6 to 8 , the inner diameter resin wall 62 of the inner diameter resin wall 62 is arranged so that the end bent portion 42 of the V-shaped opening of the interphase insulation 41 can be easily inserted using the inner diameter flange 63 as an insertion guide wall. The inner diameter flange 63 extending in the circumferential direction along the stator inner diameter is provided with a notch 90 cut out from the stator inner diameter side. The cutout 90, as easily inserted bent portion 42 of the end portion of the V-shaped opening of the phase insulation 41, the stator shaft substantially perpendicular or or stator lamination direction with respect to the stator axial end faces Inclined so that the inner diameter side of the inner diameter flange 63 expands from the side away from the direction end face (upper side of the inner diameter flange 63) to the end surface side of the stator axis (lower side of the inner diameter flange 63) when viewed from the stator inner diameter side. The shape is a reverse taper with respect to the stator end face side.

Further, as shown in FIG. 8, the positional relationship between the inner diameter flange 63 and the tooth tip 51 is substantially the center of the tooth tip 51 of the stator 10 when viewed from above the stator stacking direction. From the inside of the slot of the stator 11. The bent portion 42 at the end of the V-shaped opening of the interphase insulation 41 is fixed in a state where the V-shaped opening of the interphase insulating 41 is folded in the direction of the arrow from between the tooth tip 51 and the inner diameter flange 63. It is inserted and fixed between the tooth tip 51 of the iron core of the child 10 and the winding 30. In this case, when the inner diameter flange 63 protrudes from the substantially central portion of the tooth tip 51 to the inside of the slot of the stator 10 from the root of the tooth portion, the inner diameter flange 63 becomes an obstacle and the winding 30 is placed in the slot 11. I can't wind much. Conversely, when the inner diameter flange 63 protrudes from the substantially central portion of the tooth tip 51 to the inside of the slot of the stator 10 from the slot opening 52 side, the bent portion at the end of the V-shaped opening of the interphase insulation 41 42 cannot be inserted. The bent portion 42 at the end of the V-shaped opening of the interphase insulation 41 returns to the original direction by the elastic force after insertion in the slot and opens in the direction opposite to the arrow direction, and is opened by the end face portion 65 of the inner diameter flange 63. 11 is fixed so as not to be displaced.

  The bent portion 42 obtained by bending the end portion on the V-shaped opening side of the interphase insulation 41 may be interposed between the tooth tip end portion 51 of the iron core of the stator 10 and the film-like slot insulation 40. May be inserted so as to be sandwiched between a film-like slot insulation 40 covering the slot of the tooth tip end portion 51 of the iron core of the stator 10 and a winding wound around the tooth portion 50 of the stator 10. As a result, the bent portion 42 of the interphase insulation 41 is not caught in the gap between the laminated cores of the stator 10 and difficult to insert, and the film-like slot insulation 40 and the winding wound around the tooth portion 50 of the stator 10 are prevented. It can be easily inserted between the lines.

Incidentally, as shown in FIG. 7, the folding portion 42 is the cross-sectional shape by bending the end portion of the open side of the V-shape is formed in a substantially V-shape in the stator circumferential direction of the opposite direction of the slot opening 52, The inner diameter resin wall 62 of the resin insulation end plate 60 attached to both ends of the stator 10 was cut out in the stator circumferential direction from the stator end face side of the inner diameter flange 63 extending in the circumferential direction along the stator inner diameter . The end face portion 65 facing the stator end face side of the notch portion 64 is locked so as not to come out in the stator axial direction. Further, the notch 90 cut out from the inner diameter side of the inner diameter flange 63 is preferably the upper resin insulation end plate 60a and the lower resin insulation of the resin insulation end plate 60 attached to both ends of the stator. It is preferable to provide only one of the end plates 60b on the side where the interphase insulation 41 is inserted. On the side where the notch 90 of the inner flange 63 is not provided, the interphase insulation 41 can be reliably fixed without being displaced.

Accordingly , the bent portion 42 at the end of the V-shaped opening side of the interphase insulation 41 having a substantially V-shaped cross section interposed between the windings is cut out from the stator end surface side in the stator circumferential direction. The end surface portion 65 of the portion 64 can be locked on both sides of the stator 10, and even if the motor vibrates, it can be reliably insulated without dropping from between the windings of the stator 10, and the quality can be improved.

DESCRIPTION OF SYMBOLS 10 ... Stator 11 ... Slot 30 ... Winding 40 ... Slot insulation 41 ... Interphase insulation 42 ... Bending part 50 ... Tooth part 51 ... Tooth tip part 52 ... Slot opening 60 ... Resin insulation end plate 60a ... Upper resin end plate 60b ... Lower resin end plate 61 ... Outer diameter resin wall 62 ... Inner diameter resin wall 63 ... Inner diameter flange 64 ... notch 65 ... end face 66 ... side face 69 ... winding trunk 80 ... resin insulation end plate 81 ... outer diameter resin wall 82 ... Inner diameter resin wall 83 ... Inner diameter flange 87 ... Corner part 88 ... Notch part 90 ... Notch part

Claims (4)

A stator in which a plurality of thin electromagnetic steel plates are laminated and fixed integrally, a resin end plate attached to both ends in the stator stacking direction, and directly to the teeth of the stator via the resin insulating end plate In an electric motor having a wound winding and a rotor that rotates on the inner diameter side of the stator ,
The resin insulating end plate includes a winding body , an outer diameter resin wall extending from a portion of the winding body on the stator outer diameter side in a stator lamination direction opposite to the stator end surface, and the winding An inner diameter resin wall extending in the stator lamination direction opposite to the stator end face side from the stator inner diameter side portion of the wire body,
The inner diameter resin wall has an inner diameter flange part extending in the stator circumferential direction along the stator inner diameter,
The inner diameter flange portion is provided with a notch portion in which the stator end face side is notched in the circumferential direction of the stator,
The notch part is formed by sequentially forming an end face part facing the stator end face side, and an end face part of the notch part from the end part of the end face part on the slot opening side of the stator in the stator stacking direction. An electric motor characterized by comprising a side surface portion for reducing the depth in the circumferential direction of the stator .   2. The electric motor according to claim 1, wherein the slot of the stator is covered with a film-like slot insulating paper. The slot of the stator, has an interphase insulation interposed therebetween of the winding wound directly on the teeth of the stator,
The interphase insulation is an insulating member having a substantially V-shaped cross section viewed from the stator lamination direction, and is arranged so that the substantially V-shaped opening side faces each slot opening of the stator , A substantially V-shaped end portion on the opening side is provided with a bent portion that is bent in a circumferential direction of the stator opposite to the slot opening portion of the stator, and the bent portion is connected to a tooth portion of the stator. claim 1 wherein the electric motor according 2 claims, characterized in that interposed between the windings. The electric motor according to claim 3 , wherein a bent portion of the interphase insulation is fixed by an end surface portion constituting the notch portion .

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