JPH07123667A - Stator for magnet-type dc machine - Google Patents

Abstract

PURPOSE:To secure magnets and auxiliary poles to a yoke and, further, obtain a stable holding force regardless of the variations in dimensions of the components. CONSTITUTION:The stator 1 is composed of a yoke 2 and a plurality of permanent magnets 3 and auxiliary poles 4 provided on the inner circumference of the yoke 2. Holders 5 made of elastic material are fixed to the yoke 2. Protrusions are provided on the holders 5 so as to press the auxiliary poles 4 on the positions away from their centers. Further, the holders 5 are used within or near the plastic deformation range of the material of the holders 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator used in a magnet type DC machine. In particular, the present invention relates to a stator of a magnet type DC machine having a structure in which a magnet and an auxiliary pole are fixed to a yoke by a holding force of a holder.

[0002]

2. Description of the Related Art Conventionally, as a stator for a magnet type DC machine having this value, it is disclosed in Japanese Patent Laid-Open No. 60-187249, and a holder (3) made of a U-shaped elastic body is used as a yoke. It is fixed to (2), and the magnet (4) and the auxiliary pole (5) are fixed to the yoke (2) by the elastic force of the holder (3).

[0003]

It is clear from calculations and experiments that the attraction force and moment force in the central direction act on the auxiliary pole due to the armature magnetomotive force during operation of the DC machine.

The above-mentioned prior art does not have a structure that suppresses the above-mentioned motive force, and cannot reliably fix the auxiliary pole. Also, due to the dimensional variation of each component,
It has a drawback that the fixing force of the magnet and the auxiliary pole also varies.

An object of the present invention is to fix a magnet type DC machine which reliably holds a yoke, a magnet and an auxiliary pole and can obtain a stable fixing force without being influenced by dimensional variation of each component. To provide a child.

[0006]

In a stator having a plurality of permanent magnets and auxiliary poles arranged on the inner circumference of a yoke, a holder made of an elastic body fixed to the yoke has a center of the auxiliary pole. By providing a protrusion so as to press the outer peripheral side, the moment force acting on the auxiliary pole during operation of the DC machine can be suppressed, and the material plastic deformation range or plasticity of the holder made of an elastic body fixed to the yoke By using it in the vicinity of the deformation area, it is possible to obtain a stable fixing force without being influenced by the dimensional variation of each component and to achieve the above object.

[0007]

According to the present invention, in a stator formed by disposing a plurality of permanent magnets and auxiliary poles on the inner circumference of the yoke, a holder made of an elastic body fixed to the yoke is provided with a center of the auxiliary pole. Since a protrusion is provided to press the outer peripheral side, when operating a DC machine,
The moment force acting on the auxiliary pole can be surely suppressed. Also, because it is used in the material plastic deformation region or near the plastic deformation region of the holder made of an elastic body fixed to the yoke, without being affected by the dimensional variation of each component root,
A stable fixing force can be obtained.

[0008]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. The stator 1 has a structure in which a plurality of permanent magnets 3 and auxiliary poles 4 are fixed to the inner circumference of a cylindrical yoke 2. A holder 5 made of an elastic body and having a U-shaped cross section is fixed to the yoke 2, and the permanent magnet 3 and the auxiliary pole 4 are sandwiched and fixed between adjacent holders. As shown in FIG. 2, the holder 5 is provided with a through hole 51, and the protruding portion 2 extruded from the yoke 2 is formed.
It is fixed to the yoke 2 by 1. As shown in FIGS. 3 and 4, projections 50 are provided near both ends of the holder 5 in the axial direction so as to press the outer peripheral side of the center 42 of the auxiliary pole 4. During operation of the DC machine, the armature magnetomotive force causes the attraction force F in the central direction on the inner peripheral surface 41 of the auxiliary pole 4, and the auxiliary pole 4
A moment force M acts on the center 42 of the. Since the attraction force F is suppressed by the pressing force of the tip 52 of the holder 5, and the moment force M is suppressed by the protrusion 50 of the holder 5, the auxiliary pole 4 can be securely fixed. it can.

FIG. 5 shows an example of the relationship between the deflection amount δ of the holder 5 and the load f. In the stator 1 of the present invention, the holder 5
The free width Wf of the holder is determined to be used in the vicinity of the plastic deformation range, and compared with the case of using it in the elastic deformation range, the stable load is not affected by the variation of each component (variation of deflection amount δ). It is clear from FIG. 5 that

Therefore, the permanent magnet 3 to the yoke 2 and the auxiliary pole 4
Can be securely fixed, and a stable fixing force can be obtained.

[0012]

According to the present invention, in a stator having a plurality of permanent magnets and auxiliary poles arranged on the inner circumference of the yoke, the auxiliary pole is attached to the holder made of an elastic body fixed to the yoke. Protrusions are provided to press the outer peripheral side from the center, and the holder is used in the material plastic deformation area of the holder, so that the magnet and the auxiliary pole can be held securely and is not affected by the dimensional variation of each component. A stable fixing force can be obtained.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

2 is a P-direction view of FIG. 1. FIG.

FIG. 3 is a partial cross-sectional view of main parts taken along the line AA of FIG.

FIG. 4 is a perspective view of a holder.

FIG. 5 is a diagram showing a load with respect to a bending amount of the holder of the present invention.

[Explanation of symbols]

1 ... Stator, 2 ... Yoke, 3 ... Permanent magnet, 4 ... Auxiliary pole, 5
... a holder, 50 ... a protrusion.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Hideo Mori Hideo Mori, 2520 Takaba, Katsuta-shi, Ibaraki Hitachi, Ltd. Automotive Equipment Division (72) Inventor Keisuke Nishidate 2520, Takata, Katsuta-shi, Ibaraki Hitachi, Ltd. (72) Inventor Atsushi Saeki, Atsushi Saiki, Katsuta City, Ibaraki 2520, Takaba, Hitachi, Ltd.

Claims (2)

[Claims] 1. A stator used in a magnet type DC machine, comprising a plurality of permanent magnets and auxiliary poles arranged on the inner circumference of a yoke, wherein a plurality of holders made of an elastic body are provided. In the stator fixed to the yoke, holding the permanent magnet and the auxiliary pole between the adjacent holders, and fixing the permanent magnet and the auxiliary pole to the yoke by the support of the holder, from the center of the auxiliary pole A stator for a magnet type DC machine, characterized in that a protrusion is provided on the holder so as to press the outer peripheral side. 2. The stator for a magnet type DC machine according to claim 1, wherein the holder is used in a material plastic region or near the plastic region.