JP2006141173A - Stator of motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor less in the aged deterioration of the insulation performance of a stator winding and high in efficiency and reliability. <P>SOLUTION: A divided core 1 is formed by laminating electromagnetic steel plates whose pole tooth units are divided in the circumferential direction, and a slot insulating plate 2 that insulates an opening of a pole tooth 1a is sandwiched by an end insulator 5 that individually insulates both ends and subjected to insulation treatment. Weather-resistance synthetic rubber (such as NBR) is used for an insulating body 4 having elasticity, and on the slot insulating plate 2 wound with a winding 3 of the pole tooth 1a, the rubber is adhered and fixed so as to be thick at the center of the lamination direction of the divided core 1, and thin at its both ends in advance. After that, stator pieces are formed by being wound with the winding 3 so as to be orthogonal to the pole tooth 1a while aligning the winding, and a stator is formed by connecting the pieces after annularly coupling them a prescribed number of times. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to insulation of a stator winding of an electric motor.

In recent years, motors for industrial use are required to have high efficiency and high function, and brushless motors with high efficiency, good controllability, and long life have been developed. In order to achieve this high efficiency, it is known that the concentrated winding is applied to the pole teeth of the divided stator core, and then the divided surfaces are joined and combined to improve the space factor of the stator winding. (For example, refer to Patent Document 1).
Japanese Patent Laid-Open No. 7-7875

  The problem to be solved is that the insulation performance of the stator winding deteriorates with time. Even if high efficiency is ensured by the split core and concentrated winding, the deterioration of the insulation of the stator winding has a great influence on the life of the motor.

  That is, with a stator with an improved occupancy rate, especially when the stacking length is long and the winding wire diameter is thick, the adhesion between the split core and the winding is not sufficient near the center of the split core, resulting in a large current. As a result, the winding moves due to the reaction when the current flows, and there is a possibility that the windings rub against each other and deteriorate the insulation performance. Moreover, there was a possibility of acceleration due to heat generation of the winding due to a large current.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide a highly efficient and highly reliable motor with little deterioration over time in the insulation performance of the stator winding.

  In order to solve the above-described problems, the present invention provides a slot insulator that insulates a slot opening of a split core in a stator in which a stator piece having a winding wound around each pole tooth of a split core that has been subjected to insulation processing is annularly coupled. A stator of an electric motor comprising a plate and an insulator having elasticity, wherein the insulator is interposed between the slot insulating plate and a winding. Further, the stator of the electric motor is characterized in that the pole tooth width of the split iron core is wider in the vicinity of the center than in the vicinity of both ends in the stacking direction.

  According to the stator of the electric motor of the present invention, by interposing an elastic insulator between the slot insulating plate and the winding, the adhesion between the stator core and the winding is improved, and the windings are It is possible to suppress deterioration of insulation due to rubbing. In addition, if a material having good thermal conductivity is used for the insulator, the temperature rise of the winding can be reduced and insulation deterioration can be suppressed.

  Also, by making the pole tooth width of the split iron core wider near the center than near both ends in the stacking direction, the adhesion between the iron core and the winding is improved, and the friction between the windings is prevented and the insulation deterioration of the winding is reduced. Can be suppressed. In addition, the temperature rise can be reduced, and an improvement in performance can be expected by expanding the magnetic path.

  Thus, since insulation deterioration can be suppressed with increasing the space factor of the winding, a highly efficient and highly reliable electric motor can be obtained.

In a stator for annularly coupling a stator piece wound with a winding for each pole tooth of an insulated split core, a slot insulating plate for insulating a slot opening of the split core, and an elastic insulator, A stator of an electric motor characterized in that the insulator is interposed between the slot insulating plate and a winding, and the insulator is thin at both ends in the winding direction and thick at the center.

  In the first embodiment, an insulating material having elasticity is provided on a slot insulating plate that insulates an opening of a split iron core, and then concentrated winding is performed.

  FIG. 1 is a cross-sectional view of a stator piece in the vicinity of the center in the stacking direction, and FIG. 2 is a vertical cross-sectional view of a winding portion of the stator piece.

  1 and 2, the split iron core 1 is formed by laminating electromagnetic steel sheets obtained by dividing pole teeth units in the circumferential direction, and slot insulating plates 2 that insulate the openings of the pole teeth 1a are provided at both ends. Are insulated by being sandwiched by end insulators 5 that are individually insulated.

  As the insulator 4 having elasticity, synthetic rubber (NBR or the like) having good weather resistance is used, and the cross-sectional shape is formed in an arc shape with a thick central portion as shown in FIG. The insulator 4 is bonded and fixed in advance on the slot insulating plate 2 around which the winding 3 of the pole tooth portion 1a is wound so that it is thick at the center in the stacking direction of the divided cores 1 and both ends are thin.

  Then, it winds, aligning the coil | winding 3 so that it may orthogonally cross the pole tooth part 1a, and it becomes a stator piece. After a predetermined number of the stator pieces are circularly coupled, a connection process is performed to form a stator (not shown).

  When the winding 3 having a large wire diameter is used at the time of winding, the winding 5 surely adheres at both end edges in the stacking direction of the divided cores 1 but the central portion in the stacking direction swells. However, since the insulator 4 is provided, the gap is filled with the insulator 4. Since the insulator 4 has elasticity and has a thick central portion, it can cope with a change in the gap. Further, the close contact with the winding 5 is strengthened by the repulsive force of the insulator 4, and the friction between the windings caused by the flow of a large current can be prevented to suppress insulation deterioration.

  If silicon rubber or the like having good thermal conductivity is used for the insulator, the temperature rise of the winding part can be reduced, and insulation deterioration can be further suppressed. Further, if a varnish impregnation treatment is used in combination after winding, since there is an insulator in the gap where the varnish could not be sufficiently impregnated, a fixing effect by varnish impregnation can be expected.

  Therefore, even if the wire diameter of the winding is large, a stator that suppresses insulation deterioration while maintaining a high space factor can be obtained, and a highly efficient and highly reliable electric motor can be obtained.

  The second embodiment is the same as the first embodiment except that the width of the pole tooth portion of the stator is changed depending on the stacking position to improve the adhesion between the split core and the winding.

  In FIG. 3, the split iron core 11 is formed by laminating electromagnetic steel sheets obtained by dividing the pole tooth unit in the circumferential direction, and the inner and outer peripheral parts of the pole tooth part have the same dimensions and the pole teeth around which the winding is wound. Only the width is set wide at the center in the stacking direction and narrow at both ends.

  After insulating the pole tooth opening of the split core 11 with the slot insulating plate 12 and insulating the both ends at the end insulator 15 so that the slot insulating plate 12 is sandwiched, the winding 13 is wound to form a stator piece. .

  When the winding wire 13 having a large wire diameter is used at the time of winding, the winding wire 13 surely adheres at both edge portions in the stacking direction of the divided cores 11 but tends to swell at the center portion in the stacking direction. However, since the width of the pole teeth is set wide near the center of the stacking position, there is no gap between the windings 13.

  In this way, the width of the pole teeth of the split iron core is changed depending on the location, and the width near the center of the stacking position is widened to prevent friction between the windings that occurs when a large current is passed. Deterioration can be suppressed. Furthermore, in Example 2, since the magnetic path of an iron core expands, the characteristic improvement and the heat dissipation effect can also be expected.

  The stator of the electric motor of the present invention is also useful for applications that require high reliability and a long life, and applications that do not like temperature rise.

Cross-sectional view of the lamination center of the stator pieces in Example 1 of the present invention The longitudinal cross-sectional view of the coil | winding winding part of the stator piece in Example 1 of this invention The longitudinal cross-sectional view of the coil | winding winding part of the stator piece in Example 2 of this invention

Explanation of symbols

1,11 Divided iron core 1a Pole tooth portion 2,12 Slot insulation plate 3,13 Winding 4 Insulator 5,15 End insulator

Claims (4)

In the stator for annularly connecting the stator pieces wound with the windings for each pole tooth of the insulated split core, the slot insulating plate for insulating the slot opening of the split core, and an elastic insulator, A stator for an electric motor, wherein the insulator is interposed between the slot insulating plate and a winding. The stator of an electric motor according to claim 1, wherein the insulator has a thin central portion and a thin end portion in the winding direction. The stator for an electric motor according to claim 1 or 2, wherein the insulator is made of silicon rubber having good thermal conductivity. In the stator that annularly connects the stator pieces wound around each pole tooth of the insulated split core, the pole tooth width of the split core is wider near the center than near both ends in the stacking direction. Electric motor stator.

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