JP2007215383A - Electric motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric motor of which the poor insulation by the resin insulation of the electric motor has been reduced, where a coil is wound around a plurality of magnetic pole teeth extended radially from the yoke of a stator via resin insulation. <P>SOLUTION: In the electric motor, the stator has the plurality of magnetic pole teeth extended radially from the yoke, a slot penetrating in the axial direction of the stator is formed by adjacent magnetic pole teeth, and the coil is wound around the magnetic pole teeth via the resin insulation. The resin insulation has a winding body around which a coil is wound; an outside collar extended in the axial direction of the stator at the outer-periphery side of the stator at the winding body; an inside collar extended in the axial direction of the stator at the inner-periphery side of the stator at the winding body; and a slot insulation section along the inside wall of the slot of the winding body. In this case, a corner escape section is formed at least at one place at the magnetic pole tooth corner of the resin insulation facing an end face side in the axial direction of the stator in the magnetic pole teeth. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is a stator configured by laminating a plurality of electromagnetic steel plates in the stator axial direction, and has a plurality of magnetic pole teeth extending radially from a yoke of the stator, and resin insulation is applied to the magnetic pole teeth. The present invention relates to an electric motor wound with a winding.

  Conventionally, such an electric motor has been used as a general-purpose electric motor, an electric motor for a compressor of an air conditioner / refrigeration apparatus, or an electric motor for driving a vehicle-mounted device. A concentrated winding type electric motor is used in which a winding is directly wound around a plurality of magnetic pole teeth extending radially from a stator yoke (back yoke portion) via resin insulation. This concentrated winding type electric motor can reduce the amount of copper in the winding and improve the performance as compared with a distributed winding type electric motor in which a winding is wound across a plurality of magnetic pole teeth. Further, the height of the coil end portion protruding in the axial direction from the stator end portion can be reduced, and the electric motor can be miniaturized.

  In addition, the rotor structure of such an electric motor includes a rotor (SPM) in which a permanent magnet is attached to the surface of the rotor core, and a rotor (IPM) in which the permanent magnet is embedded in the rotor core. The performance of the electric motor can be improved by using a permanent magnet rotor. As the permanent magnet, a ferrite magnet or a rare earth magnet having a stronger magnetic force than a ferrite magnet is used.

  Further, the concentrated winding type resin insulation structure in which the winding is directly wound around the magnetic pole teeth of the stator through resin insulation includes, for example, a structure as disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2003-259591). . In Patent Document 1, a rotor provided with a permanent magnet is magnetized with an external magnetizing yoke and incorporated in a case or the like so that the rotor does not adhere to dust or dust, or hits the case or the like to be damaged. 1 shows a permanent magnet motor in which a rotor is magnetized (magnetized) using a stator as a magnetizing yoke after being assembled in a case or the like.

  In this case, since the winding of the stator is used as the magnetizing winding, the winding is attracted to the rotor side, which is a magnetic material, by a strong magnetizing magnetic field. Since the corner of the base of the inner body of the winding trunk and the inner flange extending from the inner circumference of the stator to the stator axis is likely to crack, the winding is wound around the corner of the base. The radius of rounding is larger than the radius of.

  Further, in Patent Document 2 (Japanese Patent Laid-Open No. 2005-328700), a winding is wound around a magnetic pole tooth of a stator via resin insulation, and a winding body portion and a winding body portion of the winding body portion are wound. An electric motor having an outer flange extending in the stator axial direction on the outer peripheral side of the stator, an inner flange extending in the stator axial direction on the inner peripheral side of the stator of the winding body, and a slot insulating portion along the inner wall of the slot It is shown.

  In this case as well, as in Patent Document 1, when the rotor is magnetized (magnetized) using the stator as a magnetizing yoke, an attractive force is generated between the windings wound around the adjacent magnetic pole teeth. In addition, since cracks (breakage) are likely to occur at the root of the inner flange, the thickness of the resin-insulated winding trunk, outer flange, and inner flange is made larger than the thickness of the slot insulator.

JP 2003-259591 A JP-A-2005-328700

However, even in these methods, it is not possible to reliably reduce insulation defects due to cracks (breakage) of resin insulation. This will be described below with reference to FIGS.
The electric motor of FIG. 10 is a concentrated winding type electric motor in which a winding 30 (dotted line portion) is directly wound around a plurality of magnetic pole teeth 10b extending radially from the yoke 10a of the stator 10 via a resin insulation 50. A slot 90 penetrating in the axial direction of the stator 10 is formed by the adjacent magnetic pole teeth 10b, and the winding 30 is wound around the magnetic pole teeth 10b via a resin insulation 50.

  11 is a cross-sectional view of the magnetic pole teeth 10b taken along the line E-E 'showing a state where the winding 30 is directly wound through the resin insulation 50 of the electric motor shown in FIG. The resin insulation 50 shown in FIGS. 10 and 11 includes a winding body 50b around which the winding 30 is wound, an outer flange 50a extending in the axial direction of the stator 10 on the outer periphery of the stator of the winding body 50b, An inner flange portion 50c extending in the axial direction of the stator 10 and a slot insulating portion 50d extending along the inner wall of the slot are provided on the inner peripheral side of the winding body portion 50b. Further, the rotor 100 of this electric motor is an electric motor using a permanent magnet type rotor in which a permanent magnet 110 is embedded. In the electric motor shown in FIG. 10, the number of slots is 6, and adjacent permanent magnets 110 are magnetized (magnetized) to have different polarities to form four poles.

  In such an electric motor, when the electromagnetic steel sheet 20 is punched to form the slot 90 as shown in the CC ′ cross-sectional views of the magnetic pole teeth 10b of the stator 10 in FIGS. Part, burr, burrs, etc. occur. When the resin insulation 50 is mounted on the magnetic pole teeth 10b having the edge portions, burrs, burrs, etc. and the winding 30 is wound, the resin insulation 50 is applied to the magnetic pole teeth 10b by the winding tension F1 wound by the winding 30. Cracks (breakage) 60a and the like are formed at the corners of the winding body 50b facing the both axial end faces of the stator 10 of the magnetic pole teeth 10b and the slot insulator 50d attached along the inner wall of the slot. It tends to occur.

  Further, as shown in FIG. 13, when the permanent magnet 110 provided in the rotor 100 is magnetized by using the stator 10 as a magnetizing yoke, the winding 30 is attracted to the rotor 100 side as described in Patent Document 1. In addition to the generated force, as described in Patent Document 2, a force F2 attracting between the windings 30 wound around the adjacent magnetic pole teeth 10b is generated, and the shaft of the stator 10 attached to the magnetic pole teeth 10b as described above. Cracks (breakage) 60a and the like are likely to occur at the corners of the winding body 50b facing both end faces in the direction and the slot insulating part 50d attached along the inner wall of the slot.

  In particular, when the rotor 100 is magnetized using the stator 10 described later as a magnetizing yoke at the edge portion, burrs, burrs, etc. that are generated when the electromagnetic steel sheet 20 is punched to form the slot 90, Cracks (breakage) 60a occur at the corners of the winding body 50b facing the axial end faces of the stator 10 mounted on the magnetic pole teeth 10b and the slot body 50d mounted along the slot inner wall. Etc. are likely to occur.

The present invention has been made in view of such problems, and is a stator configured by laminating a plurality of electromagnetic steel plates in the stator axial direction, and the stator is a plurality of magnetic poles extending radially from the yoke. In the electric motor having a tooth, a slot penetrating in the axial direction of the stator is formed by the adjacent magnetic pole teeth and the magnetic pole teeth, and windings are wound around the magnetic pole teeth through resin insulation.
The resin insulation includes a winding drum portion around which a winding is wound, an outer flange extending in a stator axial direction (a direction opposite to the stator end face side) on the outer peripheral side of the winding drum portion, and a winding drum portion The inner flange side of the stator has an inner flange extending in the stator axial direction (opposite to the stator end face side), and a shape having a slot insulating portion along the inner wall of the slot.
In the electric motor, a corner relief portion is provided in at least one of the resin-insulated magnetic pole tooth corner portions facing the end face side of the magnetic pole teeth in the stator axial direction.

  Further, the electric motor is such that the corner relief portion at the resin-insulated magnetic pole tooth corner has a depth equal to or less than the thickness of the electromagnetic steel sheet.

  Further, the outer corner portion formed by the winding body portion on the winding surface side and the slot insulating portion on which these resin-insulated windings are wound is formed in an arc surface (R surface) shape, a chamfered shape, or a step. The electric motor has one of the shapes.

  Further, it is particularly suitable for use in an electric motor in which a direct current is passed through a winding of a stator to magnetize a rotor having a permanent magnet as a magnetizing yoke.

  In addition, this electric motor can be used for the compression apparatus and vehicle use which were used for the electric motor of the drive source which drives a compression mechanism part.

  In the electric motor of the present invention, punched edge portions, burrs, burrs, etc. are generated in the slot corner portion of the stator formed by punching a plurality of magnetic steel sheets and stacking them in the axial direction of the stator. In the case of a concentrated winding type stator in which resin insulation is attached to a magnetic pole tooth, etc. and the winding is wound directly, even if the resin insulation is strongly pressed on the magnetic pole tooth side by the winding tension of the winding In the resin-insulated magnetic pole tooth corner part facing (opposite) the stator axial end of the magnetic pole tooth, edges and burrs by punching of electromagnetic steel sheets in the inner corner part of the resin insulation will not occur. A corner relief portion is provided so as not to be affected by burrs and the like.

  In addition, when a rotor with a permanent magnet is magnetized (magnetized) by passing a direct current through a winding wound with a stator as a magnetizing yoke, the attractive force between the windings wound on adjacent magnetic pole teeth As described above, a corner relief portion is provided in the inner corner portion of the resin insulation so that cracks (breakage) or the like do not occur in the magnetic insulation tooth corner portion of the resin insulation attached to the magnetic pole teeth.

  It should be noted that the depth of the corner relief of the inner corner portion of the resin insulation is substantially the height and width of edges, burrs, burrs, etc. that occur when the electromagnetic steel sheet is punched, so the thickness of the electromagnetic steel sheet It is as follows. As a result, cracks (breakage) occur at the corners of the resin insulation facing the stator axial ends of the magnetic pole teeth, even if the resin insulation is strongly pressed to the magnetic pole teeth by the winding tension of the winding. Can be reduced.

  In addition, with the stator as a magnetizing yoke, a direct current is passed through the winding wound around the stator, and the magnet is wound around adjacent magnetic pole teeth that are generated when magnetizing (magnetizing) a rotor having a permanent magnet. In addition, cracks (breakage) at the corners of the resin insulation due to the attractive force between the windings can be reduced.

  Further, an arcuate surface (R surface) shape, a chamfered shape, or a step is formed on the outer corner portion formed by the winding body portion on the winding surface side and the slot insulating portion on which these resin-insulated windings are wound. By adopting any one of the shapes, the force applied to the outer corner portion around which the winding 30 is wound can be dispersed.

  Thereby, it is possible to reduce an insulation failure due to a crack (breakage) or the like of the inner corner portion of the resin insulation, and it is possible to obtain an electric motor that is excellent in quality and has high productivity. In addition, it is preferable to use the high-productivity electric motor improved in quality as described above for a compression device or a vehicle application that is used for a motor of a drive source that drives the compression mechanism section.

  In addition, the corner relief portion of the inner corner portion of this resin insulation is opposed to at least one of the stator axial direction both end portions, one side end portion, or a plurality of magnetic pole teeth of the electromagnetic steel plates laminated in a plurality, It is provided in an inner corner portion constituted by a winding drum portion around which the winding is wound and a slot insulating portion extending from the winding drum portion along the inner wall of the slot in the stator axial direction. The corner relief portion of the inner corner portion may be provided on the end surface side of the magnetic pole teeth in the stator axial direction, the corner relief portion may be provided in the slot insulating portion of the slot inner wall, or both of them may be provided. . Moreover, you may provide in the perimeter of the slot opening part penetrated in a stator axial direction, or its part. Further, the shape of the corner relief portion is preferably a shape that is not affected by edge portions, burrs, burrs, and the like due to punching of the electromagnetic steel sheet in the slot corner portion of the stator, such as a concave groove.

  The present invention will be described with reference to the drawings. It should be noted that parts that do not hinder the configuration of the present invention will be described using common reference numerals. The electric motor shown in FIG. 1 is a concentrated winding type electric motor in which a winding 30 (dotted line portion) is directly wound around a plurality of magnetic pole teeth 10 b extending radially from a yoke 10 a of a stator 10 via a resin insulation 51. Slots 90 penetrating in the axial direction of the stator 10 are formed by the adjacent magnetic pole teeth 10b, and the winding 30 is wound around the magnetic pole teeth 10b via a resin insulation 51. The yoke 10a (back yoke portion) may be an annular core connected in a ring shape, or may be an iron core connected in a ring shape.

  FIG. 2 is an F-F ′ sectional view showing a state in which the winding 30 is directly wound around the magnetic pole teeth 10 b of the electric motor shown in FIG. 1 via the resin insulation 51. The resin insulation 51 includes a winding body 51b around which the winding 30 is wound, and an outer flange 51a that extends in the axial direction of the stator 10 (the direction opposite to the stator end face) on the stator outer periphery side of the winding body 51b. And an inner flange 51c extending in the axial direction of the stator 10 (opposite to the stator end face) on the inner peripheral side of the winding body 51b, and a slot insulating portion 51d extending along the inner wall of the slot. Yes. Further, a permanent magnet type rotor in which a permanent magnet 110 is embedded in the rotor 100 of this electric motor is used. The electric motor of FIG. 1 has six slots, and is magnetized (magnetized) so that adjacent permanent magnets 110 have different polarities to form four poles.

  In the present embodiment, the height of the outer flange 51a in the axial direction of the stator is higher than that of the inner flange 51c. This is the force that attracts the winding 30 wound around the inner flange 51c to the rotor 100, which is a magnetic body, when the rotor 100 including the permanent magnet 110 is magnetized (in other words, in other words, the rotor 100). In order to reduce the force of the winding to fall, the height of the outer flange 51a is increased and the winding 30 is wound so as to be arranged on the outer peripheral side (outer flange 51a side) of the stator 10 as much as possible. Because. Further, a latch 40 for attaching a connection point or a lead wire by making the outer flange 51a higher than the inner flange 51c, or an insulating cover (not shown) for preventing the connection point or the lead wire from jumping out to the outside. It can also be provided as an anchor 40 to be attached.

  FIG. 3 shows a G-G ′ cross-sectional view of the resin insulation 51 attached to the magnetic pole teeth 10 b of the stator 10 of the electric motor according to the present embodiment. As shown in FIG. 3, the resin insulation 51 mounted on the magnetic pole teeth 10 b of the stator 10 has slot insulation portions 51 d inserted along the slot inner walls of the magnetic pole teeth 10 b from the axial direction of the stator 10. . The resin insulation 51 includes an upper resin insulation 41a inserted along the inner wall of the slot from the upper axial direction of the stator 10 and a lower resin insulation 41b inserted along the inner wall of the slot from the lower axial direction of the stator 10. It consists of The upper resin insulation 41a and the lower resin insulation 41b are divided into two parts in the vertical direction, with the tip portions of the upper resin insulation 41a and the lower resin insulation 41b partially overlapping at approximately the center in the slot.

  The resin insulation 51 is mounted on the magnetic pole teeth 10b in such a manner that the slot insulating portion 51d is recessed in the magnetic pole teeth 10b along the winding body 51b around which the winding 30 is wound and the slot inner wall of the magnetic pole teeth 10b. Covered. The magnetic pole teeth 10b are formed by punching the electromagnetic steel sheet 20 to form the slots 90. The edge portions, burrs, corner escape portions 71 such as burrs 80, etc. are opposed to the axial end surfaces of the stator 10 of the magnetic pole teeth 10b. The coil body 51b of the resin insulation 51 and the inner corner portion of the slot insulation 51d mounted along the inner wall of the slot are provided.

  Due to the presence of the corner relief portion 71, when the electromagnetic steel sheet 20 is punched and the slot 90 is formed, the edge portion, the burr, the burr 80, etc. due to the punching are generated in the corner portion of the slot 90. Attracting force between the windings 30 wound around the magnetic pole teeth 10b generated when magnetizing the winding tension F1 around which the winding 30 is wound through the resin insulation 51 and the rotor 100 having the permanent magnet 110 from above. Even when F2 is applied, cracks (breakage) 60a and the like are present at the corners of the winding body 51b facing the axial end face of the stator 10 of the resin insulation 51 and the slot insulation 51d attached along the inner wall of the slot. The occurrence can be reduced.

  FIG. 4 shows a detailed view of a portion d of the corner relief portion 71 of the resin insulation 51 described in FIG. Edges, burrs, burrs 80, and the like are generated at the corners of the slot 90 formed by punching a plurality of electromagnetic steel plates 20 and stacking them in the axial direction of the stator and comprising the magnetic pole teeth 10b. If the resin insulation 50 without the corner relief portion 71 described with reference to FIGS. 10 and 11 is disposed from above the edge portion, the burr, the burrs 80, etc., the corner portion is wound from above the resin insulation 50. The winding body 50b and the slot insulation are caused by the attractive force F2 between the windings 30 wound around the magnetic pole teeth 10b generated when the winding tension F1 of the winding 30 and the rotor 100 including the permanent magnet 110 are magnetized. Cracks (breakage) 60a and the like are likely to occur in the inner corner portion of the resin insulation 50 constituted by the portion 50d.

The depth a1 of the corner relief portion 71 that escapes the edge portion, burrs, burrs 80, etc. depends on the heights and widths of the edge portions, burrs, burrs 80, etc. generated when the electromagnetic steel plate 20 is punched. The thickness may be equal to or less than b1. In many cases, the thickness of the electromagnetic steel plate 20 is t0.25 to t0.5. If the depth a1 of the corner relief portion 71 is too deep, the resin thickness becomes thin and quality, strength, etc. cannot be maintained.
Further, the resin thickness of the slot insulating part 51d is made thinner than the resin thickness of the winding body part 51b. In this case, a large number of windings 30 are wound around the slot 90 and are thinned to improve the efficiency of the electric motor. As can be seen from this, the strength of the corner portion of the resin insulation 51 constituted by the winding body portion 51b and the slot insulation portion 51d is weak. Therefore, by providing the corner relief portion 71, the edge portion, the burr, the burrs 80, etc. The strength can be maintained without being affected.

  FIG. 5 shows another embodiment. FIG. 5 shows a partial detailed view of the corner relief portion 72 of the resin insulation 52 as in FIG. The corner relief portion 72 is provided at an inner corner portion of the resin insulation 52 constituted by the winding body portion 52b and the slot insulation portion 52d. As in FIG. 4, the magnetic steel sheet 20 has a corner relief on the axial end face side of the stator 10 of the magnetic pole tooth 10b and slot insulation on the side surface of the slot of the magnetic pole tooth 10b so as not to be affected by edge parts, burrs, burrs 80, etc. A corner relief portion is provided on the portion 52d side. As a result, it is possible to escape swelling caused by sagging from the plate surface side of the electromagnetic steel sheet 20 to be punched out to the shearing surface, which is generated at the cutting edge of the punching die (upper end of the upper blade and lower blade).

  Between the windings 30 wound around the magnetic pole teeth 10b generated when magnetizing the winding tension F1 of the winding 30 wound around the resin insulation 52 by the corner relief 72 and the rotor 100 having the permanent magnet 110. The attracting force F2 can reduce the occurrence of cracks (breakage) 60a and the like at the inner corner portion of the resin insulation 52 constituted by the winding body 52b and the slot insulation 52d.

4, the depth a2 of the corner relief 72 for escaping the edge, burrs, burrs 80, etc. depends on the height and width of the edge, burrs, burrs 80, etc. generated when the electromagnetic steel sheet 20 is punched. What is necessary is just the board thickness b2 or less of the electromagnetic steel plate 20. In many cases, the thickness of the electromagnetic steel sheet 20 is t0.25 to t0.5. The depth of the corner relief portion on the slot insulating portion 52d side of the slot side surface of the magnetic pole tooth 10b may be determined by considering the swelling due to sagging from the plate surface side to which the electromagnetic steel sheet 20 is punched to the shear surface. It is preferable that the depth a2 of the previous corner relief portion 72 is set to a depth that further considers swelling due to sagging of the thickness of the electromagnetic steel sheet 20, that is, the thickness b2 or more of the electromagnetic steel sheet 20.
Further, the corner relief portion 72 of the resin insulation 52 in FIG. 5 may be manufactured by an integral molding die, but after the corner relief portion on the axial end surface side of the stator 10 of the magnetic pole tooth 10b is fabricated by integral molding, the magnetic pole You may provide a corner relief part in the slot insulation part 52d side of the slot side surface of the tooth | gear 10b by an additional process. Moreover, you may provide in resin insulation (for example, resin insulation 50) which does not provide the corner relief part 72 itself by an additional process.

  Further, the resin thickness of the slot insulating portion 52d is made thinner than the resin thickness of the winding trunk portion 52b. In this case, a large number of windings 30 are wound around the slot 90 and are thinned to improve the efficiency of the electric motor. As can be seen from this, the strength of the corner portion of the resin insulation 52 constituted by the winding body portion 52b and the slot insulation portion 52d is weak, so that by providing the corner relief portion 72, the edge portion, the burr, the burrs 80, etc. The strength can be maintained without being affected.

  6 shows the corner relief portion 71 of the corner portion of the winding body 51b and the slot insulating portion 51d described in FIGS. 3 and 4 when viewed from the end face side of the magnetic pole teeth 10b in the stator axial direction of the electromagnetic steel sheet 20. FIG. It is the mounting surface (the back side surface of the resin insulation 51 demonstrated in FIG. 1) of the resin insulation 51. FIG. As can be seen from FIG. 6, a corner relief 71 is provided around the slot opening which is the inner corner of the slot insulating portion 51 d. The corner relief 71 may be the entire circumference of the opening of the slot 90 penetrating in the stator axial direction, or may be provided at a part thereof. The shape of the corner relief portion may be a shape that can absorb the height and width of edge portions, burrs, burrs 80, and the like due to punching of the electromagnetic steel sheet 20 in the slot 90 portion of the stator 10, such as a concave groove. In particular, a better effect can be obtained by providing the corner relief portion 71 at the inner winding corner portion 51b of the resin insulation 51 and the slot insulation portion 51d facing the end face of the magnetic pole tooth 10b.

7 can further improve the effect described in FIG.
In the configuration described with reference to FIG. 4, a circular arc surface (R surface) is formed at the outer corner portion of the winding body portion 53b and the slot insulating portion 53d on the winding surface side where the winding 30 of the resin insulation 53 is wound as shown in FIG. A shape is provided. The arcuate surface shape has a radius larger than the radius of the wire 30 and the outer corner portion is provided with an arcuate surface shape.

  Therefore, by providing the corner relief portion 73, the magnetic pole teeth generated when magnetizing the winding tension F1 of the winding 30 wound from above the resin insulation 53 of the outer corner portion and the rotor 100 having the permanent magnet 110 are provided. The crack (breakage) 60a etc. which generate | occur | produces in the inner corner part of the resin insulation 53 by the attractive force F2 between the coil | windings 30 wound around 10b can be reduced, and also the coil | winding which winds the coil | winding 30 around the resin insulation 53 By providing an arcuate surface (R surface) shape at the outer corner portion of the body portion 53b and the slot insulating portion 53d, the force F3 applied to the outer corner portion around which the winding 30 is wound can be dispersed, and a crack (breakage) 60a. Etc. can be prevented.

FIG. 8 shows another embodiment having the same effect as FIG.
In FIG. 8, a chamfered shape is provided at an outer corner portion of the winding body portion 54 b and the slot insulating portion 54 d on the winding surface side around which the winding 30 of the resin insulation 54 is wound. This chamfered shape is a chamfered shape in which the length of one side is longer than the radius of the wire diameter of the winding 30.

  Therefore, by providing the corner relief portion 74, the magnetic pole teeth generated when magnetizing the winding tension F1 of the winding 30 wound from above the resin insulation 54 of the outer corner portion and the rotor 100 having the permanent magnet 110 are provided. The crack (breakage) 60a etc. which generate | occur | produces in the inner corner part of the resin insulation 54 by the attractive force F2 between the windings 30 wound around 10b etc. can be reduced, and also the winding which winds the winding 30 around the resin insulation 54 By providing a chamfered shape at the outer corner portion of the body portion 54b and the slot insulating portion 54d, the force F3 applied to the outer corner portion around which the winding 30 is wound can be dispersed, and cracks (breakage) 60a and the like can be prevented. it can.

FIG. 9 shows another embodiment having the same effect as that of FIGS.
In FIG. 9, a stepped shape is provided at the outer corner portion of the winding body 55b and the slot insulating portion 55d on the winding surface side where the winding 30 of the resin insulation 55 is wound. The interval of the stepped shape is provided with an interval wider than the radius of the wire 30.

  Accordingly, by providing the corner relief portion 75, the magnetic pole teeth generated when magnetizing the winding tension F1 of the winding 30 wound from above the resin insulation 55 of the outer corner portion and the rotor 100 including the permanent magnet 110 are provided. The crack (breakage) 60a etc. which generate | occur | produces in the inner corner part of the resin insulation 55 by the attractive force F2 between the coil | windings 30 wound around 10b can be reduced, and also the coil | winding which winds the coil | winding 30 around the resin insulation 55 By providing a stepped shape at the outer corner portion of the body portion 55b and the slot insulating portion 55d, the force F3 applied to the outer corner portion around which the winding 30 is wound can be dispersed to prevent cracks (breakage) 60a and the like. Can do.

  In the invention of the present application, as described above, the stator 10 is a magnetized yoke, a direct current is passed through the winding 30 wound around the stator 10, and the permanent magnet 110 provided in the rotor 100 is magnetized. In addition to the phenomenon in which the winding 30 is attracted to the rotor 100 side, the winding body facing both axial end faces of the stator 10 mounted on the adjacent magnetic pole teeth 10b as described in FIG. Even if the attractive force F2 between the windings 30 is applied to the outer corner portion of the slot insulating portion 50d attached along the inner wall of the slot 50b and the slot 50b, the winding of the resin insulation 51 to 55 as shown in FIGS. Since the corner relief portions 71 to 75 are provided at the inner corner portions of the winding body portions 51b to 55b and the slot insulating portions 51d to 55d around which the wire 30 is wound, the occurrence of cracks (breakage) 60a and the like can be reduced.

  Further, a compressor device mounted on an air conditioner and a refrigerator, in which the stator 10 of the motor is an electric motor of a driving source for driving a compressor in which refrigerant gas and lubricating oil are mixed in an airtight container, and fixing of the electric motor By using the child 10 as a motor for driving a vehicle-mounted device in a vehicle, the winding body portions 51b to 55b and the slot insulation portions 51d to 55d of the resin insulation 51 to 55 around which the windings 30 of the stator 10 are wound. Since the cracks (breakage) 60a and the like can be reduced in the inner corner portion to be configured, it is possible to provide a compression device and a vehicle equipped with an electric motor that is excellent in quality and has reduced insulation failure.

The electric motor of this embodiment. F-F 'sectional drawing in the magnetic pole tooth of the electric motor shown in FIG. G-G 'sectional drawing in the magnetic pole tooth of the electric motor shown in FIG. FIG. 4 is a detailed view of a portion d in the corner relief portion of FIG. Another embodiment in a corner relief. The figure seen from the back side of the resin insulation in the slot part of FIG. Another embodiment in a corner relief. Another embodiment in a corner relief. Another embodiment in a corner relief. Conventional electric motor. E-E 'sectional drawing in the magnetic pole tooth of the conventional electric motor shown in FIG. The figure explaining the crack (fracture) of the resin insulation which generate | occur | produces by the winding tension F1 in the C-C 'cross section of the magnetic pole tooth of the conventional electric motor shown in FIG. FIG. 11 is a diagram for explaining a crack (destruction) of a resin insulation generated by an attractive force F2 attracted between windings when magnetized in the C-C ′ cross section of the magnetic pole teeth of the conventional electric motor shown in FIG. 10.

Explanation of symbols

10 ... Stator 10a ... yoke 10b ... magnetic pole teeth 20 ... electromagnetic steel plate 30 ... winding 40 ... locking 40a, 41a ... upper resin insulation 40b, 41b ... Lower resin insulation 50 to 55 ... resin insulation 50a, 51a ... outer flange 50b, 51b to 55b ... winding trunk 50c, 51c ... inner flange 50d, 51d to 55d・ Slot insulation part 60a ... crack part (destructive part)
71-75 ... Corner relief 80 ... Edge, burr, burrs 90 ... Slot 100 ... Rotor 110 ... Permanent magnet

Claims (6)

A stator configured by laminating a plurality of electromagnetic steel plates in the stator axial direction, wherein the stator has a plurality of magnetic pole teeth extending radially from the yoke, and the stator shaft is formed by adjacent magnetic pole teeth and magnetic pole teeth. In the electric motor in which a slot penetrating in the direction is formed and the magnetic pole teeth are wound with a winding through resin insulation,
The resin insulation includes a winding body portion around which the winding is wound, an outer flange extending in the stator axial direction on the stator outer periphery side of the winding body portion, and a stator on the stator inner periphery side of the winding body portion. It has a shape with an inner flange extending in the axial direction and a slot insulating portion along the inner wall of the slot.
An electric motor characterized in that a corner relief portion is provided in at least one of the resin-insulated magnetic pole tooth corner portions facing the end face side of the magnetic pole teeth in the stator axial direction. The electric motor according to claim 1, wherein a depth of a corner relief portion in the resin-insulated magnetic pole tooth corner portion is set to a depth equal to or less than a thickness of the electromagnetic steel sheet. The outer corner portion formed by the winding body portion on the winding surface side and the slot insulating portion on which the resin-insulated winding is wound is either an arc surface (R surface) shape, a chamfered shape, or a stepped shape. The electric motor according to claim 1, wherein the electric motor is ridden. The electric motor according to any one of claims 1 to 3, wherein the rotor of the electric motor is a rotor having a permanent magnet. The compression apparatus according to any one of claims 1 to 4, wherein the electric motor is used as an electric motor of a drive source that drives a compression mechanism section. The vehicle according to any one of claims 1 to 4, wherein the electric motor is mounted for vehicle use.

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