JP2010226810A - Electric motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric motor having a resin-insulated part which allows easy positioning and sure installation of a stator of the electric motor, while maintaining the performance of the electric motor. <P>SOLUTION: In the electric motor in which the stator 10 includes an annular yoke 11, extending in the circumferential direction and a plurality of teeth 12, radially extending from the annular yoke 11, and a winding 30 is wound to the resin-insulated part 20 formed at the teeth 12; the shape of the bottom of a slot of the stator 10 is a slot shape formed with an angular part 16 having an angle in at least one part. In the resin-insulated part 20, a positioning protrusion 29 for positioning at the stator 10 is formed at the end face side of the resin-insulated part which faces the stator, and the positioning protrusion 29 is inserted into and fixed to the angular part 16, having the angle at least in one part of the bottom of the slot of the stator. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a concentrated winding type electric motor in which both ends of a stator are insulated with resin insulation and the inside of a slot is insulated with a film-like slot insulation, and windings are wound directly around the stator teeth.

  Conventionally, such an electric motor has a stator of an electric motor as shown in patent document 1 (Unexamined-Japanese-Patent No. 2003-319593) and patent document 2 (Unexamined-Japanese-Patent No. 2004-194413). In Patent Document 1 and Patent Document 2, in an electric motor including an annular yoke portion extending in the circumferential direction of a stator and a plurality of teeth portions from the annular yoke portion toward the stator inner diameter direction, the annular yoke portion of the stator Resin insulation facing the teeth portion is applied, and a stator with film-like slot insulation is shown in the slots of the stator.

  The resin insulation is composed of an annular yoke resin insulation extending in the circumferential direction around the annular yoke part, and a plurality of tooth parts including a tooth part resin insulation extending radially from the annular yoke resin insulation. A winding body for winding a wire, and an inner diameter resin wall extending in the axial direction opposite to the stator axial end surface from the stator inner diameter side of the winding body, and the annular yoke resin insulation is fixed It has an outer diameter resin wall extending in the axial direction opposite to the stator axial direction end surface side from the outer diameter side of the child. Also, the resin insulation end face that faces the stator axial end face is provided with a protrusion to prevent the stator and resin insulation from shifting, and the stator axial end face corresponds to the resin insulation protrusion. A concave portion is provided.

JP 2003-319593 A JP 2004-194413 A

  A concentrated winding type motor in which resin insulation is applied to both end faces in the stator axial direction, film-like insulation is provided in the slots, and windings are wound directly around the teeth of the stator, and both end faces in the stator axial direction Protrusion protrusions are provided on the resin insulation end face facing the stator axial end face so that the stator and resin insulation do not deviate from the resin insulation end face. In the motor provided with the recess groove corresponding to the protrusion of the portion, when the yoke width of the annular yoke portion of the stator is wide, the motor performance is slightly reduced due to the presence of the recess groove. However, when the yoke width of the annular yoke portion is small, providing a groove in the concave portion on the end surface in the stator axial direction narrows the magnetic flux path and deteriorates the motor performance.

  According to the present invention, in such a miniaturized electric motor, in order to securely fix the resin insulation to the axial end face of the stator, a positioning recess groove is provided to narrow the magnetic flux path on the axial end face of the stator. The purpose is to provide an electric motor that can securely fix resin insulation and does not deteriorate the motor performance.

The stator includes an annular yoke portion extending in the circumferential direction and a plurality of teeth portions extending in the radial direction from the annular yoke portion, and is provided with resin insulation facing the axial end surface of the stator so that the stator has a slot. Is a motor with a concentrated winding method in which a film-like slot insulation is applied and a winding is wound directly around the resin insulation applied to the teeth part.
The shape of the slot bottom of the stator is a slot shape having at least one angle;
The resin insulation is provided with positioning protrusions for positioning the stator on the resin insulation end face side facing the stator.
The positioning protrusion is an electric motor that is inserted and fixed at a corner portion having an angle of at least one position on the bottom of the slot of the stator.

  The resin-insulating positioning protrusion is inserted and fixed between a corner portion having at least one angle of the shape of the bottom of the stator slot and a film-like slot insulator mounted in the stator slot. Use an electric motor.

  Alternatively, the positioning protrusion may be configured to hold down the slot insulation after the film-like slot insulation mounted in the stator slot is attached to the corner having at least one angle of the shape of the slot bottom of the stator. The electric motor is inserted and fixed as described above.

By using the electric motor of the present invention, a stator in which a stator insulation structure is opposed to the axial end surface of the stator, and a motor in which film-like slot insulation is mounted in a slot of the stator, the stator In the slot-shaped electric motor having a slot bottom portion having an angle of at least one position, a positioning projection for positioning the stator is provided on the side of the resin insulating end surface facing the stator, and the positioning projection is By inserting and fixing to at least one corner of the stator slot bottom,
It is no longer necessary to provide recess grooves for fixing the resin-insulating convex positioning protrusions on both end surfaces of the stator in the axial direction, preventing deterioration of motor performance without narrowing the magnetic flux path in the stator. Can do. In particular, it has a remarkable effect in a concentrated winding type motor in which the motor is downsized and the winding is wound directly around the teeth.

Further, the resin-insulating positioning protrusion is provided at a corner between the corner having at least one angle of the shape of the bottom of the slot of the stator and the film-shaped slot insulation mounted in the slot of the stator. By inserting and fixing along
By inserting resin-insulating positioning protrusions in the space where no winding is inserted in the corner of the bottom of the slot, resin insulation is applied to both ends in the axial direction of the stator without substantially affecting the winding amount of the winding wound into the slot. It can be fixed securely.

In addition, after mounting the film-like slot insulation mounted in the stator slot on the corner portion having the angle of at least one position of the shape of the slot bottom of the stator, the resin-insulating positioning projection is inserted into the slot insulation. By inserting and fixing so as to be pressed down by the resin-insulating positioning protrusions from above, the slot insulation can be prevented from being displaced by the winding wound directly from above the resin insulation of the tooth portion, and insulation failure can be reduced.
The electric motor of the present invention can be used for a miniaturized vehicle electric motor, and can be used for an electric motor in a compressor such as an air conditioner or a refrigerator.

The figure which looked at the stator of the electric motor of the embodiment of the present invention from the top. The figure of the stator before winding the coil | winding in FIG. The figure of the stator iron core of the electric motor in FIG. FIG. 4 is a detailed view of a slot in which a winding is mounted in the stator slot of FIG. 3. The figure seen from the back side of the resin insulation demonstrated in FIG. FIG. 6 is a detailed view of a slot portion of a positioning protrusion on the back side of the resin insulation shown in FIG. FIG. 3 is an A-A ′ sectional view of the stator shown in FIG. 2. The slot detail drawing which has mounted | worn with the winding in the stator slot of the electric motor of another embodiment.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a top view of a stator 10 of an electric motor according to the present embodiment. In FIG. 1 (and FIG. 3), the stator 10 includes an annular yoke portion 12 extending in the circumferential direction of the stator 10 and a plurality of teeth portions 13 extending from the annular yoke portion 12 in the radial direction. Resin insulation 20 is attached to both axial end surfaces 11 of the stator 10. The resin insulation 20 is disposed so as to face the annular yoke portion 12 of the stator 10 and a plurality of teeth portions 13 extending radially from the annular yoke portion 12.

  A direct winding 30 is wound around the resin insulation 20 disposed in the tooth portion 13 by a concentrated winding method. Further, the lead wire drawn from one end of the winding 30 wound around the resin insulation 20 of the tooth portion 13 forms a neutral point, and the lead wire drawn from the other end is connected to an external power source. The lead wire 60 to be connected is connected. The stator 10 has 9 slots, and is a 3-phase 6-pole stator connected in 3Y. The temperature sensor 70 is attached to the stator 10 of the embodiment and connected to an external circuit.

  Further, in FIG. 2, the resin insulation 20 is attached to the axial end 11 of the stator 10 described in FIG. 1, and the film-like slot insulation 40 is attached to the slot 50 of the stator 10. The state before winding the coil | winding 30 around the coil | winding trunk | drum 23 is shown.

  The resin insulation 20 shown in FIG. 2 includes an annular yoke resin insulation 28b extending in the circumferential direction on the annular yoke 12, and a teeth resin insulation 28a extending in the radial direction from the annular yoke resin insulation 28b on the plurality of teeth 13. The winding body 23 for winding the winding 30 directly around the tooth portion resin insulation 28a, and from the stator inner diameter side of the winding body 23 to the axial end surface side 11 of the stator 10 is reversed. It is composed of an inner diameter resin wall 21 extending in the axial direction, and the annular yoke portion resin insulation 28b is composed of an outer diameter resin wall 22 extending from the stator outer diameter side to the axial direction opposite to the axial end surface side 11 of the stator 10. Has been.

  Further, teeth tip portion resin insulations 27a and 27b are provided in the circumferential direction of the inner resin wall 21 of the resin insulation 20 at the tooth tip portions 17a and 17b extending in the circumferential direction on the stator inner diameter side of the teeth portion 13 of the stator 10. It has been. The tooth tip resin insulations 27a and 27b slightly protrude from the teeth tip portions 17a and 17b of the stator 10 to the inside of the slot 50 so as not to hinder the winding 30 from being wound around the winding body 23. . As a result of this protrusion, the film-like slot insulation 40 attached to the slot 50 is locked and prevented from protruding in the axial direction of the stator 10, and the slot insulation 40 is prevented from falling off. (See Fig. 6 and Fig. 7)

FIG. 3 is a view for explaining the shape of the stator core of the stator 10 shown in FIG.
The stator 10 of FIG. 3 has nine slots as described above, and the tooth portion 13 extends from the annular yoke portion 12 toward the inner diameter direction of the stator 10. The slot shape of the stator 10 is such that the annular yoke portion is formed at a substantially right angle (θ) from the root of the slot inner wall 14a facing the slot side of the teeth portion 13 extending from the annular yoke portion 12 toward the inner diameter side of the stator 10. There are provided slot inner bottom walls 15a facing the 12 slots. Similarly, a slot inner bottom wall 15b facing the slot side of the annular yoke portion 12 is provided at a substantially right angle (θ) from the root of the slot inner wall 14b facing the slot side of the tooth portion 13 adjacent to the tooth portion 13. ing. Accordingly, the shape of the slot bottom portion is such that at least one corner 16 having an angle is provided by intersecting the slot inner bottom wall 15a facing the slot side of the annular yoke portion 12 and the slot inner bottom wall 15b. Yes. In this case, the angle formed by the slot inner side walls 14a and 14b facing the slot side of the tooth portion 13, the slot inner bottom wall 15a facing the slot side of the annular yoke portion 12, and the slot inner bottom wall 15b (θ ) Is 90 degrees. And θ is approximately 90 degrees. The meaning is included.

  FIG. 4 is a detailed view of the slot before the film 30 is installed in the slot 50 of the stator 10 described in FIG. 4, the slot inner bottom wall 15a facing the slot side of the annular yoke portion 12 and at least one corner 16 having an angle by the intersection of the slot inner bottom wall 15b are provided as described in FIG. Slot 50. A slot inner wall 14a and a slot inner bottom wall 15a are formed in the slot 50 from a slot opening portion of a tooth portion distal end portion 17a extending in a circumferential direction from the stator inner diameter side of the tooth portion 13 of the stator 10 by a film-like slot insulation 40. 15b covers the inner wall 14b of the slot and insulates from the stator inner diameter side of the adjacent tooth portion 13 to the slot opening portion of the tip end portion 17b of the teeth portion extending in the circumferential direction.

  The slot bottom shape of the film-like slot insulation 40 is formed in an arc shape, and the slot inner bottom wall 15a facing the slot side of the annular yoke portion 12 of the slot bottom portion of the stator 10 described above, and the slot inner bottom A slight gap is generated in the radial direction of the stator 10 without completely adhering to the corner portion 16 that intersects the wall 15b and has an angle.

  Further, the width B in the stator circumferential direction of the gap generated between the slot insulation 40 in which the bottom portion of the slot is formed in an arc shape and the slot 50 having the corner 16 is determined by the nozzle 80 of the winding machine. It is an insertion passage for inserting the winding 30 deeply and winding the winding 30, and this gap is always necessary for winding the winding 30 in the concentrated winding method in which the winding 30 is wound directly around the teeth portion 13. This is a space where the winding 30 cannot be wound substantially. In addition, the dotted line in a figure has shown the winding range at the time of winding the coil | winding 30 around the teeth part 13. FIG.

  FIG. 5 is a view as seen from the back side of the resin insulation 20 shown in FIG. 6 is a detailed view of the slot portion seen from the back side of the resin insulation 20 shown in FIG. FIG. 7 is a cross-sectional view of the stator 10 shown in FIG. The shape of the resin insulation 20 will be described with reference to FIGS. 5, 6, and 7.

  From the root of the slot inner wall resin insulation 24a facing the slot side of the teeth resin insulation 28a extending from the annular yoke resin insulation 28b on the back side of the resin insulation 20 shown in FIGS. A slot inner bottom wall resin insulation 25a facing the slot of the annular yoke resin insulation 28b is provided at a substantially right angle (θ). Similarly, facing the slot side of the annular yoke resin insulation 28b at a substantially right angle (θ) from the root of the slot inner wall resin insulation 24b facing the slot side of the tooth resin insulation 28a adjacent to the tooth resin insulation 28a. A slot inner bottom wall resin insulation 25b is provided. As a result, the shape of the inner bottom portion of the slot is such that the slot inner bottom wall resin insulation 25a facing the slot side of the annular yoke portion resin insulation 28b and the slot inner bottom wall resin insulation 25b facing the slot side of the annular yoke portion resin insulation 28b. And has a structure in which at least one corner portion 26 having an angle is provided. In this case, slot inner wall resin insulations 24a and 24b facing the slot side of the tooth portion resin insulation 28a and slot inner bottom wall resin insulations 25a and 25b facing the slot side of the annular yoke portion resin insulation 28b are formed. The angle (θ) is 90 degrees. And θ is approximately 90 degrees. The meaning is included.

  A slot inner bottom wall resin insulation 25a facing the slot side of the annular yoke portion resin insulation 28b of the resin insulation 20 and a slot inner bottom wall resin insulation 25b intersect each other to form a stator at an angled corner portion 26. 10 is provided with positioning protrusions 29 extending from the back side of the resin insulation 20 to the end surface side in the stator axial direction.

The positioning protrusions 29 extending from the back side of the resin insulation 20 are substantially perpendicular to the base of the slot inner wall 14a facing the slot side of the teeth portion 13 of the stator 10 as shown in FIG. 7 (and FIG. 4). From the root of the slot inner bottom wall 15a facing the slot side of the annular yoke portion 12 located at (θ) and the slot inner wall 14b facing the slot side of the adjacent tooth portion 13, it is located at a substantially right angle (θ). In the gap between the corner portion 16 having an angle formed by intersecting the slot inner bottom wall 15b facing the slot side of the annular yoke portion 12, and the film-like slot insulation 40 having an arc-shaped slot bottom portion, a slight tightening is performed. The positioning projection 29 is fitted with a margin.
Thereby, the resin insulation 20 can be reliably fixed to the axial end surface 11 of the stator 10.

  In this embodiment, the positioning protrusion 29 is provided at one location where the slot inner bottom wall resin insulation 25a facing the slot side of the annular yoke resin insulation 28b and the slot inner bottom wall resin insulation 25b intersect. If the shape of the bottom of the slot of the stator 10 is a polygonal shape, a plurality may be provided. Further, it is not necessary to provide the positioning projections 29 at all the corners of each slot 50 of the stator 10, as long as the resin insulation 20 can be reliably fixed on the axial end surface 11 of the stator 10.

Another embodiment is shown in FIG.
Since the main part of the stator core of the stator 10 and the resin insulation 20 has the same structure as that described with reference to FIGS. Moreover, since the symbol explaining the shape of the stator core of the stator 10 and the shape of the resin insulation 20 is the same as the use demonstrated in FIGS. 1-7, it attaches | subjects and demonstrates the same symbol.

  FIG. 8 is a detailed view of the slot before the film-like slot insulation 40 is attached to the slot 50 of the stator 10 and the winding 30 is wound. In the slot 50 provided with at least one corner 16 having an angle by the intersection of the slot inner bottom wall 15a facing the slot of the annular yoke portion 12 of the stator 10 and the slot inner bottom wall 15b, a film is provided. The slot inner wall 14a, the slot inner bottom walls 15a and 15b, the slot inner side from the slot opening of the tooth portion tip end portion 17a extending in the circumferential direction from the stator inner diameter side of the tooth portion 13 of the stator 10 by the shaped slot insulation 40 The wall 14b is covered and insulated from the stator inner diameter side of the adjacent tooth portion 13 to the slot opening portion of the tooth portion distal end portion 17b extending in the circumferential direction.

  Further, the width B in the stator circumferential direction of the gap generated between the slot insulation 40 in which the bottom portion of the slot is formed in an arc shape and the slot 50 having the corner 16 is determined by the nozzle 80 of the winding machine. It is an insertion passage for inserting the winding 30 deeply and winding the winding 30, and this gap is always necessary for winding the winding 30 in the concentrated winding method in which the winding 30 is wound directly around the teeth portion 13. This is a space where the winding 30 cannot be wound substantially. In addition, the dotted line in a figure has shown the winding range at the time of winding the coil | winding 30 around the teeth part 13. FIG.

  In the present embodiment, after the film-like slot insulation 40 is attached to the slot 50 of the stator 10, the positioning protrusions 29 of the resin insulation 20 described with reference to FIGS. 1 to 7 are placed on the film-like slot insulation 40. Therefore, the resin insulation 20 is fitted into the stator 10 with a slight tightening margin so as to be pressed to the corner 16 side of the slot 50. Thereby, it is possible to prevent the slot insulation from being shifted due to the winding wound directly from above the resin insulation of the tooth portion, and to reduce the insulation failure. In this case, a groove is preferably provided on the outer peripheral side of the positioning protrusion 29 of the resin insulation 20 so that the axial end of the film-like slot insulation 40 can be inserted and fixed.

  Further, the electric motor of the present invention can be used for a miniaturized electric motor for a vehicle, and can be used for an electric motor in a compressor such as an air conditioner or a refrigerator.

  Accordingly, it is not necessary to provide recess grooves on both axial end surfaces 11 of the stator 10 for fixing the positioning protrusions 29 of the resin insulation 20, so that the flow of magnetic flux in the stator is not hindered. In addition, the slot inner bottom walls 15a and 15b at the bottom of the slot, which is a surplus space for passing the nozzle 80 of the winding machine for winding the winding 30 around the tooth portion 13 through the positioning projection 29 of the resin insulation 20, intersect. By fixing to the corner portion 16 of the angle, the winding 30 can be wound around the slot 50 without substantially reducing the winding amount of the winding 30 wound around the slot 50, and the motor performance is not deteriorated.

  Examples of the material of the resin insulation 20 and the slot insulation 40 include polyethylene naphthalate (PEN), polyethylene sulfide (PPS), liquid crystal polymer (LCP), fluororesin, polyetheretherketone (PEEK), polybutylene terephthalate (PBT), and the like. There is.

  A plurality of positioning protrusions 29 extending from the back side of the resin insulation 20 may be provided as long as the shape of the slot bottom of the stator 10 is a polygonal shape. Further, it is not necessary to provide the positioning projections 29 at all the corners of each slot 50 of the stator 10, as long as the resin insulation 20 can be reliably fixed on the axial end surface 11 of the stator 10. The height of the positioning projection 29 is about 1 mm to 5 mm.

DESCRIPTION OF SYMBOLS 10 ... Stator 11 ... End surface 12 of an axial direction of a stator ... Ring-shaped yoke part 13 ... Teeth part 14a, 14b ... Slot inner wall 15a, 15b ... Slot inner bottom wall 16- .... Corners 17a, 17b ... Teeth tip 20 ... Resin insulation 21 ... Inner diameter resin wall 22 ... Outer diameter resin wall 23 ... Winding body 24a, 24b ... Slot Inner wall resin insulation 25a, 25b ... Slot inner bottom wall resin insulation 26 ... Corners 27a, 27b ... Teeth tip resin insulation 28a ... Teeth resin insulation 28b ... Annular yoke resin Insulation 29 ... Positioning protrusion 30 ... Winding 40 ... Slot insulation 50 ... Slot 60 ... Lead wire 70 ... Temperature sensor 80 ... Nozzle

Claims (3)

The stator includes an annular yoke portion extending in the circumferential direction and a plurality of teeth portions extending in the radial direction from the annular yoke portion, and is provided with resin insulation facing the axial end surface of the stator, so that the stator slot is provided. Inside is an electric motor in which film-like slot insulation is applied, and a winding is wound directly around the resin insulation applied to the teeth portion.
The shape of the slot bottom of the stator is a slot shape having at least one angle,
The resin insulation is provided with positioning protrusions for positioning the stator on the resin insulation end face side facing the stator.
The electric motor according to claim 1, wherein the positioning protrusion is inserted and fixed in a corner portion having an angle of at least one of the slot bottom portions of the stator.   The resin-insulating positioning projection is inserted and fixed between a corner having at least one angle of the shape of the bottom of the slot of the stator and a film-like slot insulation mounted in the slot of the stator. The electric motor according to claim 1, wherein:   The positioning protrusion presses the slot insulation after the film-like slot insulation fitted in the slot of the stator is attached to a corner having at least one angle of the shape of the slot bottom of the stator. The electric motor according to claim 1, wherein the electric motor is inserted and fixed as described above.

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