JP2014023233A - Stator of rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce cutout amount in a tooth to increase magnetic flux amount to pass through the tooth.SOLUTION: In a stator of a rotary electric machine, engaging notches 19 are formed in a tooth 15 made of a steel plate 16A on an external layer. In an insulator 12, engaging pieces 21 to be inserted into the engaging notches 19 are formed in a state where suppressive energizing forces are preliminary applied on an inner face 12a facing the tooth 15 on the external layer. When the insulator 12 is inserted and fitted into the tooth 15, the engaging pieces 21 energize a stator core 11 in a stator shaft direction and engage with the engaging notches 19 to prevent the insulator 12 from being pulled out from the tooth 15.

Description

  The present invention relates to a stator for a rotating electrical machine including an insulator that is fitted into a tooth portion of a stator core.

  The stator includes a stator core that serves as a magnetic flux path (magnetic path) of the rotating magnetic field. The stator core includes a ring-shaped yoke portion and a plurality of teeth portions extending radially from the yoke portion for holding the stator coil. The stator core is formed by laminating a plurality of steel plates.

  As described above, a stator coil that generates a rotating magnetic field is assembled to the tooth portion. In this assembly, an insulator is provided between the stator coil and the tooth portion in order to prevent conduction between the stator coil and the tooth portion. By inserting the insulator into the tooth portion, the outer peripheral surface of the tooth portion is covered with the insulator. A stator coil is assembled around the insulator.

  Due to a dimensional error at the time of manufacturing the tooth portion and the insulator, a gap is generated between the tooth portion and the insulator, and as a result, the insulator may be rattled. A means for suppressing this rattling is described in Patent Document 1. In patent document 1, the protrusion part is provided in the two inner surfaces which an insulator opposes. The distance between the protrusions is narrower than the width of the teeth. When the insulator is inserted into the tooth portion, the projecting portions facing each other press the tooth portion. Thereby, rattling of the insulator is suppressed.

  Further, in order to prevent the insulator from slipping out of the tooth portion, the insulator and the tooth portion may be provided with a slip-out preventing means. For example, in Patent Documents 1 and 2, protrusions are provided on two opposing inner surfaces of the insulator, and cutout grooves are provided on two opposing side surfaces of the tooth part corresponding to these protrusions. The notch groove is provided over a plurality of steel plates constituting the stator core.

JP 2008-263719 A JP 2001-136698 A

  By the way, there is an upper limit in the amount of magnetic flux that can pass through the tooth portion. It is known that the upper limit of the amount of magnetic flux is determined according to the cross-sectional area of the tooth portion. In order to keep the amount of magnetic flux below the upper limit, the amount of magnetic flux passing through the tooth portion is determined based on the cross-sectional area of the portion where the cross-sectional area of the tooth portion is minimum, that is, the portion where the notch portion is provided. In order to increase the amount of magnetic flux, there is a desire to reduce the notch amount of the tooth portion as compared with the conventional case.

  The present invention relates to a stator for a rotating electrical machine. The stator includes a stator core that includes a laminated body of steel plates and includes a ring-shaped yoke portion and a teeth portion that extends in an inner diameter direction of the yoke portion. In addition, an insulator is provided which is inserted into the tooth portion and insulates the stator core and the stator coil. A notch is formed in the outermost tooth portion. In the insulator, a locking piece to be introduced into the notch is formed on the inner surface facing the tooth portion of the outermost layer in a state in which a pressing force is applied in advance. When the insulator is inserted into the tooth portion, the locking piece urges the stator core in the stator axial direction and locks the notch portion so that the insulator comes out of the tooth portion. To prevent.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to reduce the notch amount of a teeth part, and can increase the magnetic flux amount which a tooth | gear passes rather than before.

It is a figure which illustrates the stator which concerns on this Embodiment. It is a figure explaining the steel plate which comprises a stator core. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is C enlarged view of FIG. It is a figure which shows another example of the steel plate of a stator core based on this Embodiment.

  Hereinafter, the stator of the rotating electrical machine according to the present embodiment will be described with reference to FIGS. 1 to 6. FIG. 1 illustrates a stator 10 according to the present embodiment. The stator 10 includes a stator core 11, an insulator 12, and a stator coil 13.

  The stator core 11 has a function of a path (magnetic path) through which the magnetic flux of the rotating magnetic field generated from the stator coil 13 passes. The stator core 11 includes a yoke portion 14 and a tooth portion 15. The yoke part 14 is a ring-shaped member. The teeth portion 15 is a columnar member extending from the inner peripheral surface of the yoke portion 14 in the stator inner diameter direction. A plurality of teeth 15 are provided along the circumferential direction of the stator.

  The stator core 11 may be formed by combining a plurality of divided cores. The divided core includes a yoke portion 14 divided into an arc shape and a teeth portion 15 extending from the divided yoke portion 14.

  The stator core 11 is composed of a laminate of steel plates 16. The steel plate 16 may be, for example, an annular plate on which the yoke portion 14 and the tooth portion 15 are formed. Further, when the stator core 11 is formed by combining the split cores, as shown in FIG. 2, the steel plate 16 may have an arc shape in which the split yoke portions 14 are formed.

  The steel plate 16 is preferably made of a material with high magnetic permeability, and may be, for example, a silicon steel plate. The number of steel plates 16 to be laminated is determined according to the output required for the rotating electrical machine. For example, when a rotating electrical machine is used as a vehicle drive source, about 100 to 200 steel plates 16 are stacked.

  The connection between the steel plates 16 may be, for example, by caulking. FIG. 2 illustrates an outermost steel plate 16A and the other inner steel plate 16B. A crimping convex portion 17 is provided on the inner steel plate 16B. The outermost steel plate 16 </ b> A is provided with a caulking notch 18 at a position corresponding to the caulking convex portion 17.

  The outermost steel plate 16A is provided with a notch 19 for locking. The notch portion 19 for locking may be formed in the tooth portion 15 of the outermost steel plate 16A. For example, the locking notch 19 may be a U-shaped notch of the side surface of the tooth portion 15 of the outermost steel plate 16A.

  Returning to FIG. 1, the insulator 12 is a member that electrically insulates the tooth portion 15 and the stator coil 13. The insulator 12 is made of an insulating material having elasticity, such as resin. The insulator 12 is inserted into the tooth portion 15. Thereby, the outer peripheral surface of the teeth part 15 is covered with the insulator 12. Further, a stator coil 13 is assembled on the outer periphery of the insulator 12. The insulator 12 may be formed along the shape of the tooth portion 15, and may be cylindrical when the tooth portion 15 has a column shape. Furthermore, in addition to the cylindrical portion, in order to prevent the stator coil 13 from jumping out, the insulator 12 may include flanges having a diameter larger than the outer diameter of the cylindrical portion at both ends of the cylindrical portion.

  The insulator 12 includes a locking piece 21. When the insulator 12 is fitted into the tooth portion 15, the locking piece 21 urges the stator core 11 in the stator axial direction, and locks the locking core 21 in the locking notch portion 19 so that the insulator 12 is connected to the tooth portion 15. It is a member that prevents it from slipping out.

  FIGS. 3, 4, and 5 illustrate how the locking piece 21 is introduced into the locking notch 19. FIG. 3 is a cross-sectional view taken along the line AA in FIG. 4 shows a cross-sectional view taken along the line BB of FIG. FIG. 5 shows an enlarged cross-sectional view of FIG.

  As shown in FIGS. 4 and 5, the locking piece 21 is provided on the inner surface 12 a facing the teeth portion 15 of the outermost steel plate 16 </ b> A among the inner surfaces of the insulator 12. The locking piece 21 is formed so as to extend from the inner surface 12a of the insulator 12 toward the central axis while inclining, and extends in both the stator inner diameter direction and the stator axial direction.

  The locking piece 21 is introduced into the locking notch 19 in a state in which a pressing force is applied in advance. In the present embodiment, the locking piece 21 is introduced into the locking notch 19 while being bent toward the inner surface 12 a side of the insulator 12. In this state, the locking piece 21 urges the tooth portion 15 in the stator axial direction. As a result, rattling of the insulator 12 in the stator axial direction is suppressed.

  Further, as shown in FIG. 3, the locking piece 21 is locked to the edge on the stator inner diameter side in the locking notch 19. Thereby, the movement of the insulator 12 in the stator inner diameter direction, that is, the withdrawal of the insulator 12 is restricted.

  According to the present embodiment, in order to lock the locking piece 21, it is only necessary to provide the locking notch 19 in the outermost steel plate 16A. That is, it is not necessary to provide the notch portion 19 for locking in the inner steel plate 16B. Therefore, the notch amount of the tooth portion can be reduced as compared with the conventional tooth portion in which the notch portion is provided up to the inner steel plate 16B. Since the cutout amount is reduced, it is possible to increase the amount of magnetic flux passing through the tooth portion as compared with the conventional case.

  Moreover, in FIG. 2, although the notch part 19 for latching was provided in the steel plate 16A of the outermost layer, it is not restricted to this form. If one locking piece 21 is formed, rattling and removal of the insulator 12 can be prevented. Therefore, as shown in FIG. 6, only one locking notch 19 is provided. Furthermore, the notch amount may be a minimum amount capable of locking the locking piece 21. For example, the width of the locking notch 19 may be equal to the width of the locking piece 21 in the stator circumferential direction.

  DESCRIPTION OF SYMBOLS 10 Stator, 11 Stator core, 12 Insulator, 12a Inner surface of an insulator, 13 Stator coil, 14 Yoke part, 15 Tees part, 16 Steel plate, 16A Outermost steel plate, 16B Inner steel plate, 17 Caulking convex part, 18 Caulking cutting Notch, 19 Notch for locking, 21 Locking piece.

Claims (1)

A stator core comprising a laminated body of steel sheets, an annular yoke portion, and a teeth portion extending in the inner diameter direction of the yoke portion;
An insulator that is inserted into the tooth portion and electrically insulates the stator core and the stator coil;
A stator for a rotating electric machine,
A notch is formed in the outermost teeth portion,
In the insulator, a locking piece to be introduced into the notch portion is formed on the inner surface facing the teeth portion of the outermost layer in a state in which a pressing force is applied in advance, and the insulator is attached to the teeth portion. When inserted, the locking piece urges the stator core in the stator axial direction, and locks in the notch to prevent the insulator from slipping out of the teeth. , Stator of rotating electrical machines.

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