JP6515322B2 - Stator of rotating electric machine - Google Patents

Description

  The present invention relates to a stator of a rotating electrical machine in which an insulating washer is interposed between a stator core and a bolt head when the stator core is fixed by a bolt.

  Among rotating electric machines, there is one in which a stator is disposed radially outside the rotor. Generally, this stator is composed of a cylindrical stator core made of a laminate of steel plates, a stator cover that holds the stator core in a stacked state, etc., and the stator core is It is being fixed to a stator cover by the bolt inserted in the lamination direction.

  As described above, when the stator core is fixed by the bolt, the stator core and the bolt head are electrically connected, which may cause a loss of the rotating electrical machine. Therefore, conventionally, an insulating washer is interposed between the stator core and the bolt head. And as such a stator of the conventional rotary electric machine, it is disclosed by patent document 1, for example.

Japanese Utility Model Application Publication No. 5-9146

  Here, as a material of the insulating washer, many insulating materials such as resin and ceramics are adopted. However, insulating washers made of such materials are more expensive than conventional washers that are not formed of an insulating material.

  In addition, when the insulating washer and the stator core are formed of different materials, it is difficult for the bolt tightening torque to act uniformly on the insulating washer and the stator core, and the tightening torque is large. In some cases, the insulating washer, which is a relatively small member, may be broken.

  Therefore, the present invention solves the above-mentioned problems, and while maintaining the insulation between the stator core and the bolt head, it is possible to firmly fix the stator core and to suppress the manufacturing cost. The purpose is to provide a stator of an electric machine.

A stator of a rotating electrical machine according to a first aspect of the present invention for solving the above-mentioned problems comprises: a cylindrical stator core configured by laminating a large number of thin plate pieces formed by punching a steel plate; A stator cover for housing and holding the stator core, a mounting hole penetrating in a stacking direction of the stator core, and a bolt inserted into the mounting hole and fixing the stator core to the stator cover A plurality of insulating washers interposed between the stator core and the head of the bolt, the plurality of insulating washers interposed between the stator core and the head of the bolt and insulating the head from the stator core; together are formed by punching the same type of steel sheet and the steel sheet for punching the strip, their outer diameter and inner diameter, toward the stator core from the head, superimposed so gradually decreases Characterized in that it is.

In the stator of the rotating electrical machine according to the second aspect of the present invention for solving the above problems, in the stator of the rotating electrical machine according to the first aspect , the thin plate piece and the insulating washer are formed by punching silicon steel plates. It is characterized by

  Therefore, according to the stator of the rotating electrical machine according to the present invention, by forming the insulating washer from the same type of steel plate as the steel plate for forming the thin plate piece, the tightening torque by the bolt can be reduced by the stator core and the insulating washer On the other hand, since it acts uniformly, the stator core can be firmly fixed without the insulation washer being broken. Furthermore, compared with the case where the stator core and the insulating washer are formed of different types of steel plates, the manufacturing cost of the stator can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram of the rotary electric machine which applied the stator which concerns on one Example of this invention. It is AA arrow sectional drawing of FIG. It is the perspective view which showed a mode when a some insulation washer was interposed between a stator core and a bolt head. It is the longitudinal cross-sectional view which showed a mode when two types of insulation washers from which an outer diameter size differs interposes. It is the longitudinal cross-sectional view which showed a mode when the outer diameter dimension and the internal diameter dimension interpose several kinds of insulation washers which mutually differ.

  Hereinafter, the stator of the rotary electric machine according to the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 and 2, the rotary electric machine 1 has a rotor 11 rotatably supported around the central axis of the rotary electric machine 1 and a cylindrical shape fixed to the outer side in the radial direction of the rotor 11. It is composed of a stator 12. Further, the stator 12 is composed of a stator core 21, a stator cover 22, a bolt 23, an insulating washer 24, and the like.

  The stator core 21 is a laminated body in which a large number of thin plate pieces 21a are stacked, and these thin plate pieces 21a are formed in an annular shape by punching a silicon steel plate.

  That is, the surface of the silicon steel plate is covered with a thin insulating film for limiting an overcurrent, and the stator core 21 formed by laminating a large number of thin plate pieces 21a punched out annularly from such a silicon steel plate as a whole is , Will have an insulating function.

  The stator core 21 is formed with a plurality of mounting holes 21 b. The mounting holes 21 b are through holes penetrating the stator core 21 in the stacking direction, and are arranged at equal intervals in the circumferential direction of the stator core 21.

  Further, the stator cover 22 accommodates and holds the stator iron core 21 in a stacked state, and a plurality of screw holes 22 a are formed in the stator iron core 21. The screw holes 22a are screw holes that can come into contact with the mounting holes 21b, and are arranged at equal intervals in the circumferential direction of the stator core 21 (the stator cover 22).

  Therefore, the stator core 21 can be fixed in the stator cover 22 by inserting the bolt 23 into the mounting hole 21 b of the stator core 21 and fastening it to the screw hole 22 a of the fixed cover 22.

  Furthermore, an insulating washer 24 is interposed between the stator core 21 and the head 23 a of the bolt 23. Thus, by interposing the insulating washer 24, the head 23a of the bolt 23 is insulated with respect to the stator core 21. The insulating washer 24 is annularly formed by punching out a silicon steel plate.

  That is, the large number of thin plate pieces 21a constituting the stator core 21 and the insulating washer 24 are punched out of the same kind of silicon steel plate.

  Therefore, by forming the insulating washer 24 from the same type of silicon steel plate as the silicon steel plate for forming the thin plate piece 21a, the tightening torque by the bolt 23 is uniformly made to the stator core 21 and the insulating washer 24. Since it works, the stator core 21 can be firmly fixed to the stator cover 22 without the insulating washer 24 being broken. Furthermore, the manufacturing cost of the stator 12 can be held down by forming the stator core 21 and the insulating washer 24 from the same kind of silicon steel plate.

  In the embodiment shown in FIGS. 1 and 2, one insulating washer 24 is interposed. However, as shown in FIG. 3, a plurality of insulating washers 24 may be interposed. Absent.

  Here, as described above, the insulating washer 24 is a component obtained by punching a silicon steel plate. However, when the insulating washer 24 is punched from the silicon steel plate, an outer peripheral edge portion which becomes a cut portion in the insulating washer 24 And burrs are generated in the punching direction at the inner peripheral edge. Since the generation of the burrs is caused by breaking the insulating film formed on the surface of the silicon steel sheet, the surface of the generated burrs is often not covered with the insulating film.

  Thus, when a plurality of insulating washers 24 having the same outer diameter and inner diameter are stacked and used, burrs generated at each outer peripheral edge and each inner diameter edge of the insulating washers 24 adjacent in the washer stacking direction (stacking direction) Are at the same position in the washer radial direction. When the burrs generated at the outer peripheral edge and the inner diameter edge of the adjacent insulating washers 24 are in contact with each other, the burrs in contact with each other are electrically connected, and the gaps between the contacted burrs An electrical closed circuit is formed. As a result, with the change of the magnetic flux in the rotary electric machine 1, an eddy current flows in the closed circuit, which may cause a loss of the rotary electric machine 1.

  Therefore, when a plurality of insulating washers 24 are used in layers, insulating washers 25a and 25b and insulating washers 26a, 26b, 26c and 26d as shown in FIGS. 4 and 5 are employed to solve the above problems. It does not matter.

  Specifically, in the embodiment shown in FIG. 4, two types of insulating washers 25a and 25b are alternately interposed in the bolt axis direction (stacking direction). At this time, the outer diameter of the insulating washer 25a and the outer diameter of the insulating washer 25b are different. As a result, burrs generated at the outer peripheral edge portions of the adjacent insulating washers 25a and 25b are mutually offset in the washer radial direction.

  Therefore, even if burrs occur at the outer peripheral edge portions of the adjacent insulating washers 25a and 25b, the burrs are not in contact with each other in the washer overlapping direction because they are shifted in the washer radial direction. As a result, the generation of the eddy current resulting from the contact between the burrs in the washer overlapping direction can be suppressed, so that the loss of the rotary electric machine 1 can be prevented.

  Further, in the embodiment shown in FIG. 5, a plurality of types of insulating washers 26a, 26b, 26c and 26d are sequentially interposed in the bolt axis direction (stacking direction). At this time, the insulating washers 26a, 26b, 26c and 26d are overlapped so that the outer diameter size and the inner diameter size become different from each other, and the outer diameter size and the inner diameter size become smaller gradually.

  As a result, burrs generated on the outer peripheral edge and the inner peripheral edge of the adjacent insulating washers 26a and 26b are mutually offset in the washer radial direction. Further, burrs generated on the outer peripheral edge and the inner peripheral edge of the adjacent insulating washers 26b and 26c are mutually offset in the washer radial direction. Furthermore, burrs generated on the outer peripheral edge and the inner peripheral edge of the adjacent insulating washers 26c and 26d are mutually offset in the washer radial direction.

  Therefore, the outer periphery and the inner periphery of the adjacent insulating washers 26a and 26b, the outer periphery and the inner periphery of the adjacent insulating washers 26b and 26c, and the outer periphery of the adjacent insulating washers 26c and 26d Even if burrs occur in the peripheral portion and the respective inner peripheral portions, the burrs are not in contact with each other in the washer overlapping direction because they are offset in the washer radial direction. As a result, the generation of the eddy current resulting from the contact between the burrs in the washer overlapping direction can be suppressed, so that the loss of the rotary electric machine 1 can be prevented.

  Furthermore, since the insulating washers 26a, 26b, 26c and 26d are arranged such that their outer and inner diameter dimensions gradually decrease from the head 23a of the bolt 23 toward the stator core 21, The 23 tightening torques can be concentrated towards the center of the bolt 23. Thereby, stator core 21 can be firmly fixed to stator cover 22.

  In the stator of the rotating electrical machine according to the present invention, since the insulation between the stator core and the bolt head can be easily performed by the insulating washer, it is extremely useful to improve the efficiency of the rotating electrical machine. it can.

DESCRIPTION OF SYMBOLS 1 rotary electric machine 11 Rotor 12 Stator 21 Stator core 21a Thin plate piece 21b Mounting hole 22 Stator cover 22a Screw hole 23 Bolt 24, 25a, 25b, 26a-26d Insulating washer

Claims (2)

A cylindrical stator core configured by laminating a large number of thin plate pieces formed by punching a steel plate;
A stator cover for housing and holding the stator core;
An attachment hole penetrating the stator core in the stacking direction of the stator core;
A bolt inserted into the mounting hole and fixing the stator core to the stator cover;
And an insulating washer which is interposed between the stator core and the head of the bolt in a plurality so as to insulate the head from the stator core,
The plurality of insulating washers are formed by punching a steel plate of the same type as the steel plate for punching the thin plate pieces, and the outer diameter dimension and the inner diameter dimension thereof are directed to the stator core from the head A stator of a rotating electrical machine, which is stacked so as to be gradually smaller according to . In the stator of the rotating electrical machine according to claim 1 ,
The stator of a rotating electrical machine, wherein the thin plate piece and the insulating washer are formed by punching a silicon steel plate.

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