JP2008092737A - Electric motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric motor of a compact type, high quality and high performance which reduces cracks of resin insulation of a stator for the electric motor, and decreases a coil end height. <P>SOLUTION: In the electric motor in which the resin insulation is applied to an axial end face of the stator, and a coil is wound around teeth of the stator in a concentrated winding manner, the resin insulation is constituted by an inner peripheral sidewall, an outer peripheral sidewall, and a coil shell portion which winds the coil to connect the inner sidewall and the outer sidewall. A shape of a slot is polygonal, and the slot is constituted by a corner portion and a slot bottom portion, wherein the corner portion is 90 degrees or more in narrow angle which is formed by intersection of a teeth side face and a yoke side face, and the slot bottom portion is positioned toward an outside diametrical side of a stator core rather than the corner portion. In the slot, the outer peripheral sidewall of the resin insulation is positioned where the outer peripheral sidewall is raised toward an outside diametrical side of the stator rather than the corner portion in which the teeth side face and the yoke side face intersect. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electric motor in which resin cores are subjected to resin insulation and a winding is directly wound around an iron core tooth portion of a stator.

Conventionally, such an electric motor has a stator of an electric motor as shown in patent document 1 (Unexamined-Japanese-Patent No. 2003-324882).
This application is shown in FIG. FIG. 9 shows an electric motor of a concentrated winding method in which resin insulation 6 is arranged on both end surfaces in the axial direction of the stator 7 and the winding 8 is directly wound around the teeth 7 a via the resin insulation 6. Incidentally, the winding 8 wound around the tooth 7a in FIG. 9 is indicated by a broken line for convenience of illustration.
The resin insulation 6 is composed of an inner peripheral side wall 6a and an outer peripheral side wall 6b, and a winding body 6c for connecting the inner peripheral side wall 6a and the outer peripheral side wall 6b to wind the winding 8, and the outer peripheral side of the inner peripheral side wall 6a. The side surface 11 (see FIG. 10) is inclined so that the thickness of the tip decreases as the distance from the end surface of the stator core increases. 10 is a cross-sectional view taken along the line FF ′ of the tooth portion 7a of the electric motor shown in FIG.

  Thereby, when the coil | winding 8 is wound, the stress added to the outer diameter side surface 11 of the inner peripheral side wall 6a of the resin insulation 6 can be reduced, and the crack of the inner peripheral side wall 6a can be prevented.

JP 2003-324882 A

However, as shown in FIG. 9 and FIG. 10, the outer end of the winding 8 is wound by reducing the thickness of the tip of the outer diameter side surface 11 of the inner peripheral side wall 6 a and increasing the distance from the end face of the stator core. Although the stress applied to the radial side surface 11 can be reduced, in order to further improve the performance of the electric motor, a large number of windings 8 must be tightly wound in the narrow space of the winding body 6c of the resin insulation 6 so that there is no gap. Therefore, substantial stress relaxation has not been reached.
In the present invention, stress is substantially relieved and a winding space for the winding 8 is ensured.

The present invention relates to an electric motor in which resin insulation is applied to an axial end surface of a stator and windings are concentratedly wound around the teeth of the stator, and the resin insulation includes an inner peripheral side wall, an outer peripheral side wall, an inner peripheral side wall, and an outer peripheral side wall. It is composed of a winding body that winds the connecting winding,
The slot shape of the stator is composed of a root portion having a corner portion with a narrow angle of 90 ° or more at which the teeth side surface and the yoke side surface intersect, and a slot bottom portion located on the stator core outer diameter side. As a polygonal slot,
The position where the outer peripheral side wall of the resin insulation rises is located on the stator outer diameter side from the base of the corner where the teeth side surface and the yoke side surface intersect, and is opposite to the stator core side from the position along the slot bottom. It stands up in the direction of the stator axis.

  Also, a winding body portion that connects the inner and outer peripheral side walls of the resin insulation and winds the winding, and the outer periphery located on the stator outer diameter side from the root portion having a corner portion where the teeth side surface and the yoke side surface intersect. The winding body part up to the position where the side wall stands is formed by a surface substantially parallel to the end face of the stator.

  In addition, the electric motor of the present invention is for scattering prevention that can be fixed to one or both of the outer peripheral side wall and the inner peripheral side wall in order to prevent scattering of windings, lead wires, and connection points wound around the teeth of the stator. An insulation cover is provided.

  This anti-scattering insulating cover has an inner side wall and an outer side wall, and the inner side wall projects a portion facing the slot opening of the iron core tooth portion of the stator, and is formed with unevenness on the inner peripheral side wall of the resin insulation. It has a meshing shape.

  The electric motor of the present invention can be mounted in a compressor of an outdoor unit such as a refrigerator or an air conditioner, and can also be mounted as a vehicle application.

  In the present invention, since many windings are concentrated on the stator teeth to form a high-performance electric motor, the slot-shaped tooth side and the yoke side intersect so that many windings can be wound in the slot shape. More windings are wound by forming a polygonal slot composed of a root part with a narrow angle of 90 ° or more and a slot bottom part located on the outer diameter side of the stator core. Can do.

  Also, the resin insulation structure to be attached to the axial end portion of the stator is composed of an inner peripheral side wall, an outer peripheral side wall, and a winding body portion that connects the inner peripheral side wall and the outer peripheral side wall and winds a winding. The outer peripheral side wall is provided on the stator outer diameter side from the base of the corner where the teeth side surface and the yoke side surface intersect, and the slot bottom portion is erected in the stator axial direction opposite to the stator core side. ing. As a result, a space for winding the winding is also provided on a part of the stator yoke side, and many windings can be wound.

In addition, the winding wound around the teeth (slots) with a strong force and having a high space factor escapes to the winding body of the winding space provided in a part of the stator yoke side and is placed on the outer diameter side surface of the inner peripheral side wall. The applied stress can be substantially reduced. Thereby, the breakage of the resin insulation can be reduced, and the winding height of the coil end portion can be lowered. Therefore, a small, high-quality and high-performance electric motor can be obtained.
In particular, in the present invention, it is difficult to wind the winding around the teeth, the coil end height (winding height) is increased, or the wire diameter is difficult to wind strongly around the teeth is φ0. This is particularly effective in the case of an electric motor using nine or more thick lines. Thereby, winding density can be raised and an electric motor can be reduced in size.

  In addition, the winding body of the space where the winding is wound around a part of the resin-insulated stator yoke side is substantially parallel to the stator end surface from the base of the corner where the tooth side surface and the yoke side surface intersect to the outer peripheral side wall. By using a smooth surface, the connection points, etc., connecting the windings drawn from the windings wound around the teeth can be easily fixed (stored) on the winding body provided on a surface substantially parallel to the end face of the stator. can do. As a result, the connection point fixed to the upper end of the coil end can be stored in the space between the windings, and the coil end height can be reduced.

  In addition, these motors are a method of preventing the deterioration of workability by preventing the winding, the lead wire, and the connection points, etc., directly wound with resin insulation on the stator core teeth of the stator and scattering the workability. Further, a retaining portion is provided on one or both of the outer peripheral side wall and the inner peripheral side wall of the resin insulation and the lid is covered with an insulating cover for scattering prevention. Thereby, the winding wound around the iron core tooth portion of the stator, the lead wire, the connection point, and the like can be reliably fixed.

  The inner side wall of the anti-scattering insulating cover has a shape in which a portion facing the slot opening of the iron core tooth portion of the stator protrudes and meshes with the inner peripheral side wall of the resin insulation. As a result, loosened windings, lead wires or connection points jump out to the inner diameter side of the stator and do not come into contact with the rotor to cause insulation failure or burnout accidents.

  In addition, it is possible to provide a motor with excellent quality that prevents breakage due to cracking of the resin insulation of the motor and reduces insulation failure, and can be made into a small and high-performance motor. The electric motor can be mounted on a compressor or used for a vehicle.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of the present invention. The stator 1 constitutes a slot 2 by teeth 1a protruding in an inner diameter direction of the stator from an annular yoke 1b. Resin insulation 3 is attached to the teeth 1a and the yoke portion 1b on both end surfaces of the stator 1 in the axial direction.

  The resin insulation 3 is provided with an inner peripheral side wall 3a erected in a direction opposite to the stator core from the core end surface of the stator 1 at the inner diameter side tip of the teeth 1a of the stator 1. Further, on the outer diameter side of the stator 1, an outer peripheral side wall 3 b erected from the core end surface of the stator 1 in the direction opposite to the stator core is provided. Winding body portions 3c and 3d that connect the inner peripheral side wall 3a and the outer peripheral side wall 3b are provided. The winding 4 is directly wound around the winding trunks 3c and 3d by a concentrated winding method. The number of slots of the stator 1 of this embodiment is 6 slots, and 4 poles are configured. Note that the winding 4 wound around the tooth 1a in FIG. 1 is indicated by a broken line for convenience of illustration.

  The outer peripheral side wall 3b of the resin insulation 3 of this embodiment is erected from the position of the slot bottom 2c in the stator axial direction opposite to the stator core side. The insulating structure in the slot 2 is a resin insulation that is divided into two vertically at the axial center of the stator 1, and extends from the winding body 3 c to the side surface of the slot 2 so as to straddle the teeth 1 a of the stator 1. Resin insulation is applied along the top and the slot tip portion at the center in the stator axial direction overlaps and insulates. Further, in this embodiment, the insulation in the slot 2 is resin insulation, but it may be constituted by film-like insulation.

  FIG. 2 is a detailed view of the shape of the slot 2 of the stator 1 in the present embodiment. The slot 2 is constituted by a ring-shaped yoke 1b and teeth 1a which are formed in this ring shape and protrude from the yoke 1b toward the inner diameter side of the stator 1, and the shape of the slot 2 is the teeth side surface 2a, the yoke side surface 2b, Is a polygonal slot shape composed of a root portion having a narrow angle θ of 90 ° or more and a slot bottom portion 2c located on the outer peripheral side of the stator 1 therefrom.

  In addition, by making the shape of the slot 2 the narrow angle θ at the corner where the tooth side surface 2a and the yoke side surface 2b intersect with each other is 90 ° or more, the winding region of the winding 4 of the slot 2 can be increased. The winding 4 can be wound and the motor performance can be improved.

  The structure of the resin insulation 3 is shown in FIGS. 1 and 3 (FIG. 3 is a cross-sectional view taken along the line DD ′ of the resin insulation 3 shown in FIG. 1). From the corner where the tooth side surface 2a of 1a and the yoke side surface 2b of the yoke 1b intersect, from the core end surface of the stator 1 on the outer diameter side of the stator 1 to the outer peripheral side wall 3b standing in the direction opposite to the stator core, A winding body 3d that extends in the radial direction of the stator 1 and is connected substantially parallel to the core end surface is provided. The winding body 3d extends from the winding body 3c attached to the core end surface of the stator 1 of the teeth 1a of the stator 1 in the outer diameter direction of the stator 1. Therefore, the winding body 3d is configured to cover a part of the core end surface of the stator 1 on the yoke 1b side.

  Thereby, even if many windings 4 are wound around the winding body 3c, the winding 4 escapes to the winding body 3d provided on the yoke 1b side of the stator 1, so that the winding stress of the winding 4 is increased. This can reduce the stress applied to the outer peripheral side surface of the inner peripheral side wall 3a standing facing the inner diameter side of the stator 1 and can reduce the cracking and breakage of the inner peripheral side wall 3a of the resin insulation 3. be able to.

  Similarly, in order to reduce the winding height of the coil end portion and reduce the size of the motor, the winding must be wound around the teeth with a strong force, but the winding 4 provided on a part of the stator 1 on the yoke 1b side. Since it escapes to the winding body part 3d in the space for winding the coil end part, the winding height of the coil end part can be lowered, and a small, high quality and high performance electric motor can be obtained.

  An electric motor that uses a thick wire with a wire diameter of φ0.9 or more, in which the winding 4 cannot be easily wound around the tooth 1a and the height (winding height) of the coil end cannot be easily reduced. In this case, the space of the winding body 3d works particularly effectively. Thereby, it can be set as the small electric motor which raised winding density.

  Further, another embodiment of the resin insulation 3 is shown in FIG. FIG. 4 is a cross-sectional view of the tooth as in FIG. In FIG. 4, the space of the winding body 3 d of the resin insulation 3 is made a surface substantially parallel to the core end surface of the stator 1, so that the connection point 10 between the lead wires drawn out from the winding 4 wound around the teeth 1 a, etc. Can be easily fixed (stored). As a result, the connection point 10 that must be fixed to the upper end of the coil end can be stored in the gap formed between the winding 4 and the outer peripheral side wall 3b, the winding trunk 3d, and the coil end height can be increased. Can be reduced.

  Preferably, the winding portions 3c and the inner peripheral side wall 3a of the resin insulation 3 and the corner portions of the winding main portion 3d and the outer peripheral side wall 3b have a curvature (arc shape) to wind the winding. Strength against stress can be increased. Further, the strength can be similarly increased even if the corner portion is chamfered. Thereby, the crack of the resin insulation 3 can be further prevented and quality can be improved.

  It should be noted that the lead wires drawn out at the ends of the windings 4 wound around the teeth 1a are in contact with the different-phase windings 4 wound around the teeth 1a to prevent insulation failure. The winding 4 is routed by being locked to a key-shaped (or L-shaped) hook 5 provided on the outer peripheral side wall 3b.

  Further, in the electric motor of the present embodiment, the winding 4 in which the resin insulation 3 is applied to the teeth 1a of the stator 1 and the winding is directly wound, or the lead wire or the connection point 10 is scattered, so that the handling work is significantly deteriorated and the insulation work is significantly reduced. A non-scattering insulating cover 100 as shown in FIG. 5 is engaged with either or both of the inner peripheral side wall 3a and the outer peripheral side wall 3b of the resin insulation 3 shown in FIG. 5a is provided and fixed by a locking portion (hole) 5b of the anti-scattering insulating cover (in this embodiment, the locking portion (claw) 5a is provided on the outer peripheral side wall 3b). FIG. 5 is a view in which the anti-scattering insulating cover 100 is locked to the resin insulation 3 attached to the stator 1. FIG. 6 is a diagram viewed from the front (top) of the anti-scattering insulating cover 100, and FIG. 7 is a diagram viewed from the back (bottom) of the anti-scattering insulating cover 100.

  6 and 7 includes a ring plate 200 that covers the upper end of the winding 4 (coil end portion) wound around the teeth 1a of the stator 1, and an inner diameter side of the ring plate 200. An inner side wall 300 extending so as to stand up and an outer side wall 400 extending so as to stand up from the outer diameter side of the ring plate 200 are provided. A plurality of air holes 9 for releasing heat are provided in the circumferential direction of the ring plate 200.

  FIG. 8 is an E-E ′ cross-sectional view of an electric motor equipped with the anti-scattering insulating cover 100 shown in FIG. 5. The inner side wall 300 of the anti-scattering insulating cover 100 protrudes from a portion facing the inner diameter side opening of the stator 1 of the slot 2 of the core tooth portion of the stator 1 to form a convex portion 300a. The peripheral wall 3a is shaped to engage with the unevenness. As a result, the winding 4, the lead wire, the connection point 10, and the like protrude from the gap on the inner diameter side opening of the stator 1 to the inner diameter side of the stator and come into contact with the rotor so as not to cause a burnout accident.

  As described above, the electric motor according to the present embodiment prevents damage due to cracking of the resin insulation, and the electric motor can be miniaturized to be a high-performance electric motor, so that it can be mounted in a compressor of an outdoor unit such as a refrigerator or an air conditioner, or When used as a motor for vehicles, insulation failure can be reduced, and a motor with a small vehicle mounting space can be obtained.

  In addition, it is preferable to use polyethylene sulfide (PPS), polybutylene terephthalate (PBT), liquid crystal polymer (LCP), etc. as the material of the resin insulation of the motor used in this embodiment and the insulating cover for scattering prevention.

The figure of the stator of the electric motor in this embodiment. The figure of the slot of the stator of this embodiment. D-D 'sectional drawing of FIG. The figure which showed another use of this embodiment. The figure which locked the insulating cover for scattering prevention to resin insulation. Table of anti-scattering insulation cover table The figure of the back of the insulation cover for scattering prevention. E-E 'sectional drawing of FIG. The figure of the stator of the conventional electric motor. F-F 'sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 7 ... Stator 1a, 7a ... Teeth 1b ... Yoke 2 ... Slot 2a ... Teeth side surface 2b ... Yoke side surface 2c ... Slot bottom part 3, 6 ... Resin Insulation 3a, 6a ... Inner peripheral side wall 3b, 6b ... Outer peripheral side wall 3c, 6c ... Winding trunk 3d ... Winding trunk 4, 8, 8 ... Winding 5 ... Key-like Hook 5a ... Locking part (nail)
5b ... Locking part (hole)
DESCRIPTION OF SYMBOLS 9 ... Air gap 10 ... Connection point 11 ... Outer diameter side surface 100 ... Insulation cover for scattering prevention 200 ... Ring plate 300 ... Inner side wall 300a ... Inner side wall convex part 400 ... Outside sidewall

Claims (6)

An electric motor that performs resin insulation on the axial end face of the stator and concentrates the winding on the teeth of the stator. It consists of a winding body to be wound,
The slot shape is a polygonal slot composed of a corner portion at which the narrow angle at which the teeth side surface and the yoke side surface intersect is 90 ° or more, and a slot bottom portion located on the outer diameter side of the stator,
The electric motor characterized in that the position where the outer peripheral side wall of the resin insulation stands is raised from the outer diameter side of the stator from the corner where the tooth side surface and the yoke side surface intersect. A winding body for winding a winding by connecting the inner and outer peripheral side walls of the resin insulation, and the winding body from the corner where the tooth side and the yoke side intersect to the position where the outer side wall stands up is fixed. 2. The electric motor according to claim 1, wherein the electric motor has a surface substantially parallel to the child end surface. The electric motor includes an anti-scattering insulating cover to prevent scattering of windings, lead wires, connection points, and the like directly wound by applying resin insulation to the teeth of the stator, and the anti-scattering insulating cover is an outer periphery of the resin insulation The electric motor according to claim 1, wherein the electric motor is fixed to one or both of the side wall and the inner peripheral side wall. The anti-scattering insulating cover has an inner side wall and an outer side wall, and the inner side wall projects a portion facing the slot opening of the iron core tooth portion of the stator, and the inner peripheral side wall of the resin insulation The electric motor according to claim 3, wherein the electric motor has a shape that engages with unevenness. 5. The electric motor according to claim 1, wherein the electric motor is mounted in a compressor of an outdoor unit such as a refrigerator or an air conditioner. The electric motor according to any one of claims 1 to 4, wherein the electric motor is mounted as a vehicle application.

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