JPH08149725A - Stator for electric rotating machine - Google Patents

Abstract

PURPOSE: To produce a large core using a small stamping machine by arranging pins at the notches in a core piece to be laminated, laminating predetermined number of core pieces annularly and laser welding the outer peripheral end part of the laminate into an integrated structure. CONSTITUTION: A laminate core 11 is provided with semicircular notches 14 in the split face 13 thereof and each pole tooth is punched by a small stamping machine. The cores are than laser welded 12 and laminated and an insulating part 15 is formed at the pole tooth part thus forming a winding part 16 of outer winding arranged at high density. Subsequently, predetermined number of core pieces 11 are arranged to form a circular circumference by inserting columnar pins 18 into the semicircular notches 14. Finally, the outer circumferential end part of the split face 13 is laser welded 12 in the direction of laminate to form a bonded part 17 thus obtaining an integral structure of a stator having required rigidity. This structure prevents the motor efficiency from lowering while reducing the size of the stamping machine by splitting the laminate core thus realizing significant enhancement of production efficiency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a stator of a rotary electric machine mainly used in various industrial machines.

[0002]

2. Description of the Related Art In recent years, in order to reduce the size and performance of motors, there is an increasing need for higher density of windings and space saving of winding ends. Inserter winding has been used as a winding technology for achieving high density, but it has a problem that the space at the winding end becomes large. Therefore, recently, the mainstream structure is a stator that enables both high-density winding and space saving at the winding end by dividing the iron core and winding and connecting the windings in an array. It has become to.

The structure of a conventional stator will be described below. FIG. 2 shows the structure of a conventional stator for the purpose of increasing the density of the winding and saving the space at the end of the winding. Figure 2
, 21 is a first iron core that constitutes the outside of the iron core, 22
Is the second iron core that constitutes the inside of the iron core, and 23 is the second iron core 22.
Is a joint, which joins the adjacent pole tooth portions, is an insulator, 25 is a winding portion, and 26 is a resin portion.

In the above structure, the winding portion 25 is wound on the outside at a high density in an array at right angles to the insulator 24 and is inserted into the pole tooth portion of the second iron core 22 in a predetermined amount. Then, the second iron core 22 is inserted into the inner diameter of the first iron core 21 to form the stator iron core. Further, the resin portion 26 is molded to form an integral structure.

[0005]

However, the above-mentioned conventional configuration has the following problems. 1) Since the iron core that constitutes the stator is divided by the outer peripheral portion of the pole tooth portion, the joint portion 23 that joins the inner diameter of the pole tooth is required to maintain the configuration of the second iron core 22. 2) In the joint 23, magnetic leakage between pole teeth occurs,
There is a problem that the motor efficiency is reduced, and it is necessary to make the joint portion 23 as thin as possible. 3) Therefore, in order to ensure the rigidity of the stator configuration,
Although it is necessary to mold the resin portion 26, when molding the resin portion 26, there is a problem that the insulating coating of the winding portion 25 is destroyed and a short circuit occurs between the wires. 4) Further, as the iron core becomes larger, the press cut portion of the iron core and the molding equipment also become larger, resulting in a problem that production efficiency deteriorates.

The present invention solves the above-mentioned problems of the prior art, and has a structure that enables high-density aligned windings on the outside and space saving of the winding end portions, and is a cause of reduction in motor efficiency. To provide a stator of a rotary electric machine having a split structure that does not require joints between teeth, does not require resin molding for ensuring rigidity, and can also produce a large iron core in a small press facility. It is an object.

[0007]

In order to achieve this object, a stator of a rotary electric machine according to the present invention is divided in the circumferential direction for each pole tooth unit, and a semicircular cutout is provided on the divided surface. After laminating the iron pieces, a laminated iron core piece in which the inner diameter and the outer diameter of the iron plate are laser-welded, and a winding part wound so as to be orthogonal to the pole tooth portion of the laminated iron core piece, the laminated iron core Each piece is assembled in a semi-cylindrical notch with a cylindrical pin and assembled into a predetermined number of rings, and the outer peripheral ends of the combined surfaces are laser-welded in the stacking direction to form an integrated structure. There is.

[0008]

With this structure, the following actions are achieved. 1) By dividing the iron core in units of pole teeth, it is possible to apply high-density windings (conductor space factor 70%) to each of the laminated iron core pieces in an array orthogonal to the pole teeth. It is possible to downsize and at the same time save space. 2) After the semi-circular cutouts are provided on the above-mentioned divided surfaces and the laminated iron core pieces fixed by laser welding are attached to the semicylindrical cutouts with cylindrical pins, and a predetermined number of them are combined into a cylindrical shape. Since the outer peripheral edge of the divided surface is welded in the stacking direction to form an integral structure, the laser does not enter the winding during outer peripheral welding, the winding is prevented from burning, and the weld is kept within a small area. Since it can be limited, the maximum effective yoke length can be secured, and the required rigidity of the stator can be obtained, so that resin molding becomes unnecessary and a short circuit between wires can be prevented. Further, since the joint portion of the pole tooth portion is not necessary for maintaining the structure of the iron core, it is possible to prevent the deterioration of the motor efficiency due to the joint portion. 3) By dividing the iron core into pole teeth units, the pole teeth are subdivided, and it is possible to produce a large iron core even with a small press equipment, and it is possible to significantly improve the production efficiency.

[0009]

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, FIG. 1 (a) is a finished product of laminated iron core pieces for each pole tooth unit, and FIG. 1 (b) is a predetermined number of the finished products for each pole tooth unit that are joined in a ring shape. This is the finished product of the rotating electric machine stator.

In FIG. 1 (b), only a part of the appearance of the winding is shown. In FIG. 1A, 1
Reference numeral 1 denotes a laminated iron core piece obtained by laminating iron plates divided for each pole tooth unit, and laser welding 12 the inner diameter and the outer diameter of the laminated iron core pieces to form a semicircular cutout portion 1 on a division surface 13.
Four. Reference numeral 15 is an insulating portion formed on a pole tooth portion of the laminated iron core piece 11, and 16 is a winding portion.

Further, in FIG. 1 (b), reference numeral 17 denotes a joint portion in which a predetermined number of laminated iron core pieces 11 are joined in an annular shape, and 18
Is a columnar pin attached to the notch 14 of the adjacent laminated iron core pieces 11.

In the stator of the rotating electric machine constructed as described above, the laminated iron core pieces 11 are laminated and fixed by punching laser welding 12 for each pole tooth by a small press facility,
The insulating portion 15 is formed on the pole tooth portion, and the winding portion is formed in high density in an array by the external winding. After that, the iron core pieces 11 are attached to the grooves of the semi-circular cutouts 14 with columnar pins 18 and combined in a predetermined number to form a cylindrical shape, and then the divided surface 13 is formed.
By forming the joint portion 17 by laser welding the outer peripheral end portion in the stacking direction, the integral structure having the required rigidity of the stator is formed.

[0014]

As described above, according to the present embodiment, the laminated iron core pieces are formed for each pole tooth unit, and the densely arranged winding portions are provided for each pole tooth unit, whereby the conductor core is separated. Product ratio 70
% Is possible. Further, by mounting a pin in the cutout portion of the laminated iron core piece to form a combined laser welded joint portion in an annular shape to form an integrated structure, it is possible to prevent the laser from burning the winding portion at the time of outer periphery welding, Since the welded portion can be limited to a small range, the effective yoke length can be maximized. Further, the joint portion configured in the conventional example of FIG. 2 is unnecessary, and it is possible to prevent reduction in motor efficiency by 5 to 10%. Further, since the resin portion is not necessary, a stable stator without line short circuit can be obtained. Further, the division and subdivision of the laminated core reduces the size of the press equipment, which has the effect of significantly improving the production efficiency.

In FIG. 1B, the pin 18 may be projected from the end surface of the stator to position the bracket.

[Brief description of drawings]

FIG. 1 (a) is a plan sectional view of a laminated iron core piece finished product for each pole tooth unit in one embodiment of the present invention. FIG. 1 (b) is a laminated iron core piece in one embodiment of the present invention joined in an annular shape. Plane sectional view of the stator

FIG. 2 is a plan sectional view of a conventional stator.

[Explanation of symbols]

 11 Laminated iron core pieces for each pole tooth unit 12 Laser welding 13 Dividing surface 14 Cutout portion 15 Insulating portion 16 and 25 Winding portion 17 Joint portion 18 Pin 21 First iron core 22 Second iron core 23 Joint portion 24 Insulator 26 Resin portion

Claims (1)

[Claims] 1. A laminated iron core in which iron plates are divided in the circumferential direction for each pole tooth, and an iron plate having semicircular cutouts on the divided surfaces is laminated, and then the inner and outer diameters of the iron plates are laser-welded. A piece and a winding part wound so as to be orthogonal to the pole teeth of the laminated iron core piece, and the laminated iron core piece is mounted in a semi-cylindrical notch with a cylindrical pin to provide a predetermined quantity. A stator for a rotating electric machine, which is assembled in an annular shape, and the outer peripheral end of the combined surface is laser-welded and fixed in the stacking direction.