JPH06209549A - Outer rotor type induction motor - Google Patents

Abstract

PURPOSE:To prevent resonance vibration and noise by molding one bracket and a stator core including winding integrally with thermosetting resin, and fixing bearings at the centers of this bracket and the other bracket, and further, die-casting rotor core, a rotor conductor, and a rotor frame integrally. CONSTITUTION:One bracket A and a stator core 2, where stator winding 1 is wound, are molded integrally with electric insulating thermosetting resin, and a bearing 8 for bearing a rotor shaft 3 is placed at the center of the bracket A. For a rotor, a ring-shaped rotor core 5, a rotor conductor 10, and a rotor frame 11 are die-cast integrally. The rotor frame 11 is shaped like a bottomed cylinder, and a sleeve 12 projecting upward is made at the center, and a rotor shaft 3 is press-fit in the rotor frame 11 so as to face it in the position of the stator core 2. On the other hand, to the other bracket B made of steel, a bearing 8 for bearing the rotor shaft 3 is fixed at the center.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer rotor type induction motor.

[0002]

2. Description of the Related Art Conventionally, an outer rotor type induction motor is shown in FIG.
As shown in FIG. 3, the bracket is made up of a pair of steel plate brackets, a recess for holding the bearing 8 that supports the rotor rotation shaft 3 is formed in the center of the bracket, and the rotor rotation shaft 3 is inserted in the center of the bracket on one side. And a stator fixing sleeve 16 having a flange for fixing to the bracket at one end by a caulking pin or the like, is concentrically fixed, and the stator winding 1 is wound around the other end of the stator fixing sleeve 16
Is press-fitted and retained, and a sleeve portion made of a steel plate and protruding in a cylindrical shape in the center and a rotor support disk 17 for fixing the ring-shaped rotor core 5 at the outer peripheral tip are press-fitted and fixed to the rotor rotation shaft 3 in the sleeve portion, One end of the rotor rotating shaft 3 is fitted into the bearing 8 of the bracket through the stator fixing sleeve 16 and the other end is fitted into the bearing 8 of the other bracket to hold the rotor core 5 concentrically in conformity with the outer circumference of the stator core 2. The mounting portion 13 is fixed to the mounting piece 14 by the mounting screw 15 on the outer periphery of the bracket. In this case, in addition to the fact that the outer diameter of the rotor core 5 is large and it is difficult to achieve dynamic balance of the rotor, vibration may easily occur due to high-frequency current for phase control, and noise may occur due to resonance with the steel plate bracket. There is.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide an outer rotor type induction motor with less vibration noise.

[0004]

In order to achieve the above object, one bracket and a stator core around which a stator winding is wound are integrally molded with an insulating thermosetting resin, and the rotor is rotated at the center of the bracket. While fixing the bearing that supports the shaft, the bearing that supports the rotor rotation shaft is fixed to the center of the other bracket formed of a steel plate, and supports the rotor core and rotor conductor formed in a ring shape and the rotor core. The rotor frame is integrally formed by die casting, the rotor frame is fixed to the rotor rotation shaft so that the rotor core faces the stator core, and the rotor rotation shaft is axially supported by the bearings of both brackets. Also,
The other bracket was made of a damping steel plate.

[0005]

According to the above construction, the stator core having the stator winding wound around one side of the bracket is integrally resin-molded, and the bearing for rotatably supporting the rotor rotating shaft is fixed to the center of the stator core. The bearing that supports the rotor rotation shaft is fixed in the center of the bracket, and the rotor frame that holds the rotor conductor and rotor core is integrally molded by die casting and press-fitted to the rotor rotation shaft so that the rotor core faces the stator core. The bracket bearing and the bearing fixed to the other bracket rotatably support the bracket. By integrally molding by die casting, the rigidity of the rotor frame can be increased, vibration during rotation can be reduced, resonance of the other bracket can be prevented, and vibration noise of the outer rotor type induction motor can be reduced.

[0006]

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a side sectional view showing a configuration of an outer rotor type induction motor of the present invention. A stator core 2 in which a stator winding 1 is wound around one bracket A is integrally molded with an electrically insulating thermosetting resin. A shaft hole 4 for inserting the rotor rotation shaft 3 is formed in the center of the bracket A, and a concentric circular recessed seat 7 is formed on the side opposite to the stator core, and a bearing 8 for supporting the rotor rotation shaft 3 is mounted thereon. The upper part is covered with an end bracket 9 and fixed by press fitting or adhesion. Further, a ring-shaped groove 6 into which the ring-shaped rotor core 5 is inserted is formed on the outer periphery of the stator core 2 in the bracket A. In the rotor, a ring-shaped rotor core 5, a rotor conductor 10 and a rotor frame 11 supporting the rotor core 5 are integrally formed by die casting, and the rotor frame 11 is formed into a bottomed cylindrical shape by raising the outer circumference of a disk, and its outer peripheral rising portion. While supporting the ring-shaped rotor core 5 at a predetermined height, a sleeve 12 is formed in the center of the disc that projects upward and press fits the rotor rotation shaft 3.
The rotor rotation shaft 3 is press-fitted into the rotor frame 11 so as to face the position. On the other hand, on the other bracket B made of a steel plate, a bearing 8 for supporting the rotor rotation shaft 3 is fixed to the inner center by press-fitting or bonding, and the bracket 8 protrudes outward at a predetermined position on the outer periphery of the bracket A and is mounted parallel to the axial direction. Mounting portion 13 formed with a female screw for use, and bracket B facing the mounting portion 13
Mounting piece 14 that protrudes outward and has a mounting hole
The rotor rotation shaft 3 is fitted into the bearings 8 of the bracket A and the bracket B and is rotatably supported, and the bracket A and the bracket B are joined and fixed by the mounting screws 15. With the above configuration, noise and vibration during rotation are damped by the bracket A made of resin material, and resonance is less likely to occur, so that the noise level is reduced.

[0007]

As described above, according to the present invention, the one bracket and the stator core around which the stator winding is wound are integrally molded with an insulating thermosetting resin, and the bracket and the other side bracket made of a steel plate. The bearing is fixed at the center of the ring, the ring-shaped rotor core, rotor conductor, and rotor frame are integrally molded by die casting, and they are press-fitted onto the rotor rotation shaft and then fitted into the bearings of the brackets on both sides so that the stator core and rotor core face each other. By supporting the rotor core with the rotor core securely, the resonance of vibration generated by phase control etc. during operation is reduced and the noise level is reduced, so that the outer rotor type induction motor with low vibration noise is generated. Can be provided.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a configuration of an outer rotor type induction motor of the present invention.

FIG. 2 is a side sectional view showing a structure of a conventional outer rotor type induction motor.

[Explanation of symbols]

 1 stator winding 2 stator core 3 rotor rotating shaft 4 shaft hole 5 rotor core 6 ring-shaped groove 7 concave seat 8 bearing 9 end bracket 10 rotor conductor 11 rotor frame 12 sleeve 13 mounting portion 14 mounting piece 15 mounting screw 16 for fixing stator Sleeve 17 Disc for rotor support A Bracket A B Bracket B

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Mori 1116 Suenaga, Takatsu-ku, Kawasaki City, Fujitsu General Ltd. (72) Inventor Yuji Soma 1116, Suenaga, Takatsu-ku, Kawasaki City

Claims (2)

[Claims] 1. A bracket and a stator core around which a stator winding is wound are integrally molded with an insulating thermosetting resin, and a bearing for rotatably supporting a rotor rotation shaft is fixed to the center of the bracket while a steel plate is formed. A bearing that pivotally supports the rotor rotation shaft is fixed to the center of the other bracket formed by, and a rotor core formed in a ring shape, a rotor conductor, and a rotor frame that supports the rotor core are integrally formed by die casting. An outer rotor type induction motor, wherein a frame is fixed to the rotor rotation shaft so that the rotor core faces the stator core, and the rotor rotation shaft is rotatably supported by bearings of both brackets. 2. The outer rotor type induction motor according to claim 1, wherein the other bracket is formed of a damping steel plate.