JPH099535A - Stator of motor - Google Patents

Abstract

PURPOSE: To facilitate a high density winding by a method wherein folding parts of insulating thin film members are butted to each other near the dividing planes of layer-built core pieces. CONSTITUTION: A plurality of unit core plates which are divided so as to make each unit core plate have one pole tooth and to which insulating thin film members 13 respectively are piled in layers and the inner diameter sides and the outer diameter sides of the piled core plates are welded together 19 by a laser to obtain a layer-built core segment 11. The tip parts of the insulating thin film members 13 near the dividing planes of the layer-built core segment 11 are folded to have approximate L-shapes beforehand. When a wire is wound on the segment, the L-shaped parts of the insulating thin film members 13 are folded back and fixed to a wiring jig so as not to obstruct the winding operation. When the segments are assembled so as to form an annular core, the folded parts of the insulating thin film members of the adjacent segments are butted to each other to make an insulation distance 17 larger.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator of an electric motor (hereinafter referred to as a motor) used in various industrial equipment.

[0002]

2. Description of the Related Art In recent years, in order to reduce the size and increase the performance of motors, there is an increasing need for high density windings and space saving at the ends of the windings. Especially robots and N as industrial equipment
AC servomotors used as drive sources for machine tools use magnets with extremely high magnetic flux density in the rotor of the motors in order to respond to the trend of robot speedup, space saving, and high output. In addition, it is necessary to increase the density of the stator windings.

A conventional stator of a motor will be described below. 2A is a plan sectional view of a conventional stator, FIG.
(B) is a plane cross-sectional view of a completed pole tooth product that constitutes a conventional stator. In FIG. 2, 11 is a circumferentially divided laminated iron core, 12 is a winding portion, 23 is an insulator, 14 is a divided surface of the laminated iron core, 15 is a pole tooth portion, 26 is an insulation distance, 27 is a gap, 1
Reference numeral 8 is an annular joint portion, and 19 is a laser welding portion.

With this structure, a finished product obtained by winding the winding portion 12 into individual pieces 11 of a laminated iron core and winding the insulator 23 from both sides and winding the insulating portion 23 in an array at a high density in a direction orthogonal to the pole teeth portion of 15 pieces. A stator is formed by joining a predetermined number of the above to form a cylindrical shape. In this structure, the gaps 27 are provided so that the insulators 23 between adjacent pole teeth do not interfere with each other.

[0005]

However, the above conventional configuration has the following problems.

If the insulator of 23 is hard (for example, a resin molded product) and has a structure that extends longer than the divided surface of the laminated core of 14, the connection is hindered, and if it is too short, the winding portion of 12 is formed. The insulation distance of the laminated cores divided in the circumferential direction of Nos. 11 and 11 became small, and the dielectric strength was also low, and the density of the windings could not be increased beyond a certain level.

The present invention solves the above-mentioned problems of the prior art, and an object of the present invention is to realize a motor having a circumferentially-divided laminated core provided with higher density windings.

[0008]

In order to achieve this object, the present invention provides a laminated iron core piece by laminating iron plates divided in the circumferential direction for each pole tooth unit and laser-welding the inner and outer diameters thereof. An insulating thin film member disposed so as to be in contact with a slot inner surface of a pole tooth portion of the laminated core piece and a winding portion orthogonal to the pole tooth portion of the laminated core piece; In the stator of the electric motor, which is joined to the above, and the outer peripheral portion of the joining surface is welded and fixed in the stacking direction, the folded portion of the insulating thin film member is abutted in the vicinity of the split surface of the laminated core piece.

[0009]

With this structure, the following actions can be achieved.

1) A large insulation distance can be obtained by the structure in which the folded-back portions of the insulating thin film members are abutted in the vicinity of the division surface of the laminated core piece.

2) When the insulator is made of a thin film material having elasticity (for example, polyester film) and the pole teeth are formed in an annular shape and joined together, the insulators are freely deformed even if they are pressed against each other. Is possible.

3) If the folded-back portion is fixed to the winding jig so as not to get in the way during winding, no trouble will occur when the electric wire is wound. Further, when the laminated core pieces are joined in a predetermined number of rings, the insulating thin film member is elastic and restores to fully satisfy the initial insulating function.

[0013]

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

FIG. 1 shows a structure in which a winding is provided on a circumferentially divided laminated core of an electric motor and a shape of an insulating thin film member in one embodiment of the present invention. FIG. 1 (a) shows a motor stator completed product in which a predetermined number of completed products for each pole tooth are joined in an annular shape,
FIG. 1 (b) shows a state in which an insulating thin film member is attached to each laminated iron core piece for each pole tooth unit, and FIG. 1 (c) shows a finished product immediately after winding an electric wire on each laminated iron core piece for each pole tooth unit. FIG. 1 (d) is a diagram showing a combined structure of circumferentially divided laminated cores of an electric motor in the case of the insulator shape of the present invention.

The operation of the stator of the electric motor constructed as above will be described with reference to FIG. FIG.
In (a), reference numeral 18 denotes an annular joint portion in which a predetermined number of laminated iron core pieces 11 are annularly joined. In FIG. 1 (b),
Reference numeral 11 denotes a laminated iron core piece integrated by laminating core iron cores divided into pole tooth units with the insulating thin film member 13 of the present invention, and making the inner and outer diameters of the laser welded portions 19 integral with each other. . Reference numeral 13 is an insulating thin film member formed on the pole tooth portion of the laminated iron core piece 11, and reference numeral 12 is a winding portion.

As described above, according to this embodiment, the shape of the laminated iron core piece of the insulating thin film member in the vicinity of the divided surface is as shown in FIG.
As shown in Fig. 1 (c), when the electric wire is wound, the approximately L-shaped portion of the insulating thin film member is folded back to form a winding jig ( (Not shown) so that it does not interfere with winding. From these, it is possible to increase the butt insulation distance 17 between adjacent insulators when they are annularly joined in FIG.

[0017]

As described above, according to the present invention, since the insulation distance can be increased, the dielectric strength can be increased, and a high density winding (conductor wire area factor 70%) can be easily realized, and further miniaturization and higher output can be achieved. Can be achieved. In addition, by using a resilient material for the insulator when joining the pole teeth that form the annular shape, the insulating thin film members can be freely deformed even if they are pressed against each other, enabling automatic assembly, which improves productivity. It is possible to realize a compact, high-output motor with good performance.

[Brief description of drawings]

FIG. 1A is a plan sectional view of a stator according to an embodiment of the present invention. FIG. 1B is a plan view showing a mounting state of an insulating thin film member on a laminated iron core piece according to an embodiment of the present invention. Plane cross-sectional view of a pole tooth finished product that constitutes a stator in one embodiment of the invention (d) An explanatory view of a combined structure of laminated cores in one embodiment of the present invention

FIG. 2A is a plan sectional view of a conventional stator. FIG. 2B is a plan sectional view of a completed pole tooth product that constitutes a conventional stator.

[Explanation of symbols]

 11 Individual pieces of laminated iron core in units of pole teeth 12 Winding portion 13 Insulating thin film member 14 Dividing surface of laminated iron core 15,16 Pole tooth portion 17,26 Insulation distance 18 Annular joint 19 Laser weld 23 Insulator 27 Gap

Claims (1)

[Claims] 1. An iron plate divided in the circumferential direction for each pole tooth unit is laminated, and the inner and outer diameters thereof are laser-welded to form a laminated core piece, which is in contact with the slot inner surface of the pole tooth portion of the laminated iron core piece. The insulating thin film member and the winding portion orthogonal to the pole teeth of the laminated core piece, the laminated core pieces are joined in a predetermined number of rings, and the outer peripheral portion of the joint surface is welded in the laminating direction. A stator for an electric motor, wherein the folded portion of the insulating thin film member is provided in the vicinity of a divided surface of the laminated core piece in the stator of the electric motor which is fixedly attached.