JP2001339892A - Stator in motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve insulation between a stator core and a winding by spreading resin to the top of an insulating piece. SOLUTION: Two resin-molded insulating pieces 1 are put from both side faces of a stator core 4 and mounted on the gator core 4 with the stator core 4 in between. The overlapped part of insulating pieces is put at a taper part 1b. A part of the insulating piece 1 to be mounted at a top part of a tooth is formed in a shape like a key to form a key-shaped top part 1a of the insulating piece 1. The topmost part of the taper part 1b has a resin collecting part 1c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor stator having a spool formed by stacking a plurality of insulating pieces for insulation between a stator core and a winding.

[0002]

2. Description of the Related Art In order to insulate a stator core and a winding from each other, a conventional motor stator using a spool formed by laminating a plurality of insulating pieces is shown in FIGS.
This will be described with reference to FIG. FIG. 3 is a front view of the stator core. FIG. 4 is a bottom view of one conventional insulating piece viewed from a tapered portion side. FIG. 5 shows A- of the stator core when two insulating pieces are attached to the stator core of FIG.
FIG.

[0003] In FIG. 3, a stator core 21 has a back yoke 22 formed in a cylindrical shape, and the back yoke 22.
And a plurality of teeth 23 extending from the inner peripheral portion toward the axial center.

[0004] The tip 23a of the teeth 23 on the shaft center side.
Are formed in a T-shape divided into two directions. Each of the tip portions 23a is tapered toward the tip.
By narrowing the tip in this manner, the slot 24
And the space factor of the winding is improved.

In FIGS. 4 and 5, a spool 25 is attached so as to cover the teeth 23. The spool 25 is composed of two insulating pieces 26 and 27 formed by molding a resin having electrical insulation performance, and the two insulating pieces 26 and 27 are connected to both ends of the stator core 21. The spool 25 is inserted from the surface.

Further, if there is a gap between the connecting portions of the insulating pieces 26 and 27, the insulating property is impaired. Therefore, the insulating pieces 26 and 27 are mounted so that the ends thereof overlap each other.

[0007] The overlapping portions are formed such that the taper 26a, 27a is formed so that the thickness becomes thinner toward the outermost end, and the tapered portion 27a of one insulating piece 27 is placed on the other, and the other is tapered. Insulation piece 2
The sixth taper 26a is formed.

Then, a winding is wound around the teeth 23 covered with the spool 25 to form a stator.

[0009]

In the spool constructed as described above, for example, the ends of the teeth are formed in a T-shape, and the tip of the T-shaped portion is protected by the spool to the extreme end. It has a configuration. However, since the tip of the insulating piece is thin, an unfilled portion may be formed. Therefore, the insulation performance at this location is reduced.

[0010]

Therefore, according to the present invention, the portions of the two insulating pieces to be attached to the tips of the teeth are formed in a key shape, and the key-shaped tips of the insulating pieces are provided. A stator for an electric motor, wherein a resin reservoir is provided at the tip of the taper.

[0011]

According to the present invention, an insulating piece to be attached to the tip of a tooth is formed such that a portion where the insulating piece is overlapped is formed in a key shape, and the thickness of the insulating piece is uneven compared with a portion where other insulating pieces are overlapped. By increasing the thickness, the resin can be spread to the tip portion, and the insulation performance is improved.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a motor stator according to the present invention will be described with reference to FIGS. FIG. 1 is a bottom view of one of the insulating pieces of the present invention as viewed from a tapered portion side. FIG. 2 is a perspective view of a tapered portion of the insulating piece of FIG.

In FIG. 1 and FIG.
Are formed by molding a resin having electrical insulation performance. In addition, two insulating pieces 1 are used, and almost the entire surface of the stator core 4 except for the inner and outer peripheral surfaces thereof is sandwiched by a spool from both end surfaces of the stator core 4, and is fixed by the spool. The secondary core 4 and the winding are insulated.

The shape of the tip 1a of the insulating piece 1
That is, the portion provided at the tip of the tooth 3 is formed in a key-like bent shape toward the slot 2 side.
By making the tip 1a of the insulating piece 1 bent toward the slot 2, the winding is prevented from protruding from the inside of the slot 2.

Each of the overlapping portions of the insulating pieces 1 other than the tip portion 1a is formed with a taper 1b toward the foremost end, similarly to the conventional insulating piece. The taper 1b of one of the insulating pieces 1 is The tapered portion (not shown) of the other insulating piece is formed on the taper 1b.

A taper 1b is formed at the point where the tip 1a of the insulating piece 1 overlaps, toward the tip of the insulating piece 1, and a resin reservoir 1c is provided at the tip of the insulating piece 1. Only, it is thick despite the state of the art.

By providing the resin reservoir 1c at the leading end of the insulating piece 1 as described above, the resin spreads to the tip of the insulating piece 1 and the insulation distance between the stator core and the winding is ensured. And the insulation performance can be improved.

[0018]

According to the present invention, since the resin spreads to the tip of the insulating piece, the insulation between the stator core and the winding can be improved.

[0019]

[Brief description of the drawings]

FIG. 1 is a bottom view of one insulating piece of the present invention as viewed from a tapered portion side.

FIG. 2 is a perspective view of a tapered portion of the insulating piece of FIG.

FIG. 3 is a front view of a stator core.

FIG. 4 is a bottom view of one conventional insulating piece viewed from a tapered portion side.

FIG. 5 is an enlarged vertical sectional view of an AA part of the stator core when two insulating pieces are attached to the stator core of FIG. 3;

[Explanation of symbols]

 1, 26, 27: insulating piece 1b, 26a, 27a: taper 1c: resin pool 2, 24: slot 3, 23: teeth 4, 21: stator core 22: back yoke 25: spool

Claims (1)

[Claims] 1. A stator core comprising: a cylindrical back yoke; and a plurality of teeth extending from an inner peripheral portion of the back yoke toward an axial center. , And a spool made of two resin-molded insulating pieces, wherein the insulating pieces are arranged so that the stator core is sandwiched between the stator cores from both end faces of the stator core. In the stator of the electric motor, which is attached to a core and the overlapped portion of the insulating pieces is formed in a tapered shape, a portion of the two insulating pieces to be attached to a tip of the tooth is formed in a key shape. A stator for an electric motor, wherein a resin reservoir is provided at a tip end portion of a taper, which is a key-like tip portion of a piece.