JPS6074956A - Permanent magnet synchronous motor - Google Patents

Abstract

PURPOSE:To eliminate the loss of a permanent magnet synchronous motor by fixing a permanent magnet with cured resin to a yoke, thereby reducing a gap between the stator and the magnet and simultaneously eliminating a reinforcing member such as a steel plate between the stator and the permanent magnet. CONSTITUTION:After a yoke 2 is inserted fixedly to a shaft 1, a plurality of permanent magnets 3 are disposed on the outer periphery of the yoke 2. Caps 4, 4' are externally inserted to cover the ends of the yoke 2 and the magnets 3, and solidified with an adhesive 5. Then, a platelike fabric 6 impregnated with thermosetting resin is wound on the outer peripheral surfaces of the caps 4, 4' and the magnets 3, and heated and cured. The magnets 3 are rigidly secured to the yoke 2 by the bonded cap 4 and the fabric 6 reinforced with the fabric.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to the structure of a rotor of a permanent magnet synchronous motor using permanent magnets in the rotor.

[Background of the invention]

Synchronous motors have many uses compared to motors whose rotational speed is always constant during operation, and in particular, many small motors are made of permanent magnet synchronous motors that use permanent magnets, and are used as timers and various control motors.

However, the manufacturing method of permanent magnet synchronous motors has made them more expensive than the aluminum die-cast squirrel cage rotors used in small induction motors. However, with the spread of ferrite magnets in recent years, it has become possible to obtain relatively inexpensive magnets, but these ferrite magnets have extremely low mechanical strength, and are inferior to steel materials in particular with respect to impact forces. Therefore, in practical use, they were protected with steel plates, etc. For this reason, there were drawbacks such as a wide gap between the magnet and the stator, a large amount of magnetic leakage, and losses due to eddy currents generated in the steel plates.

[Purpose of the invention]

An object of the present invention is to improve such drawbacks and provide a permanent magnet synchronous motor that reduces the gap between the stator and the permanent magnets, and eliminates reinforcing materials such as steel plates between the stator and the permanent magnets, thereby reducing losses. .

[Summary of the invention]

That is, in the permanent magnet synchronous motor of the present invention, the permanent magnets are fixed to the yoke using a resin cured material reinforced with a cab and a fabric to both fix the permanent magnets and protect the outer surface of the stator and the permanent magnets. At the same time, the aim was to reduce the gap between the stator and the permanent magnets, and eliminate the reinforcing materials such as steel plates between the stator and the permanent magnets, thereby eliminating losses.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings. Fig. 1 shows a longitudinal cross-sectional view of a rotor of a permanent magnet synchronous motor showing an embodiment of the present invention, Fig. 2 shows a cross-sectional view of the section A-A' in Fig. 1, and Fig. 3 shows a resin A cross-sectional view similar to FIG. 2 taken along the line A-A' is shown in the case where the cured product has two layers. 1 is the shaft, 2 is the yoke, 3 is the permanent magnet, 4 is the cap, 5 is the adhesive, 6
．． 8 is a cured resin material reinforced with textiles, and 7.9 is a seam when the resin reinforced with textiles is wound. That is, after inserting and fixing the yoke 2 to the shaft 1, a plurality of permanent magnets 3 are placed on the outer periphery of the yoke 2, a cap 4.4' is inserted so as to cover the end of the yoke and the permanent magnet, and an adhesive is applied. 5
After fixing the cap and the permanent magnet, a plate-shaped fabric impregnated with a thermosetting resin is wound around the outer peripheral surfaces of the cap and the permanent magnet, and the cap and the permanent magnet are heated and cured. Therefore, a plurality of permanent magnets 3
is a bonded cap 4 and a cured resin material 6 reinforced with fabric.
The permanent magnet 3 can be firmly fixed to the yoke 2 by reducing the gap with the stator, reducing magnetic leakage, and there is no metal such as a steel plate between the stator and the permanent magnet 3 that causes magnetic leakage. This has the advantage that losses are extremely small. In addition, since the fabric impregnated with thermosetting resin is wound around the outer periphery of the cap 4 and the permanent magnet 3 in two layers, and the seams 7 and 9 are shifted by 180 degrees, the reinforcing effect is significantly improved. The advantage is that the layer of reinforced cured resin 6 can be stiffened.

〔Effect of the invention〕

In the permanent magnet synchronous motor of the present invention, a plurality of permanent magnets are arranged on the outer circumference of a cylindrical yoke, a cap is inserted so as to cover the end of the yoke and the permanent magnets, and the cap and the permanent magnets are fixed with adhesive. A fabric impregnated with thermosetting resin is wound around the outer circumferential surface of the yoke, and the structure is such that the permanent magnet is fixed to the cylindrical yoke by heating and hardening, so it is reinforced with a cap and fabric to which multiple permanent magnets are glued. The cured resin has the effect of firmly fixing the rotor and the stator, and the gap between the rotor and stator can be reduced, which has the effect of reducing magnetic leakage. Furthermore, since there is no metal such as a steel plate between the stator and the permanent magnet that causes magnetic leakage, an effect of extremely low loss can be obtained.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view of a rotor of a permanent magnet synchronous motor showing an embodiment of the present invention, Fig. 2 is a cross-sectional view taken along the line A-A' in Fig. 1, and Fig. 3 is a two-layered resin cured product. FIG. 2 is a cross-sectional view similar to FIG. 2;

Claims (1)

[Claims] 1. In a permanent magnet rotating synchronous motor, a plurality of permanent magnets are arranged on the outer periphery of a cylindrical yoke, a cap is inserted so as to cover the end of the yoke and the permanent magnets, and is fixed with an adhesive. After that, a fabric impregnated with a thermosetting resin is wound around the outer peripheral surface of the cap and the permanent magnet, and the permanent magnet is fixed to the cylindrical yoke by heating and hardening. 2. Permanent magnet synchronization according to claim 1, in which two layers of fabric are wound around the outer peripheral surfaces of the cap and the permanent magnet, and the connecting surface of the lower layer fabric and the connecting surface of the two layers of fabric are shifted by 180 degrees. motor.