JPS6133339B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved method of assembling a stator of a permanent magnet motor.

Conventionally, when assembling the stator of a permanent magnet motor, a special jig is used to position and fix the permanent magnet on the inner circumference of the yoke, and the adhesive interposed between the yoke and the permanent magnet dries. This jig was used to maintain the fixation until then. And after the glue dries,
A permanent magnet was magnetized. However, such an assembly method has the disadvantage that the above-mentioned special jig is required and the assembly work is complicated.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for assembling a stator of a permanent magnet motor that can reliably assemble a permanent magnet to the inner periphery of a yoke with a simple operation that does not require the use of special jigs. That is.

The figure shows an example of a stator of a permanent magnet motor assembled by the method of the present invention. In the figure, 1 is a cylindrical yoke, and 2 is an arc-shaped stator fixed to the inner peripheral surface of the yoke 1 with adhesive. It is a permanent magnet. Projections 1a are formed on the inner peripheral surface of the yoke 1 at locations corresponding to both ends of the permanent magnet 2, and correspondingly, notch-shaped recesses 2a are formed on the outer periphery of both ends of the magnet 2.
are provided for each. And permanent magnet 2
is fixed to the yoke 1 with the projection 1a and the recess 2a engaged with each other.

When assembling the stator, in the present invention, first, the yoke 1 having the above protrusion 1a and the unmagnetized permanent magnet 2 having the above recess 2a are prepared. Formation of protrusion 1a on yoke 1 and magnet 2
The recess 2a can be formed at the same time as the yoke 1 and the magnet 2 are formed, respectively.

Next, the permanent magnet 2 before magnetization is temporarily magnetized to give the magnet 2 a certain function as a magnet. This temporary magnetization can be performed by a known method.

Thereafter, an adhesive is applied to the outer circumferential surface of the temporarily magnetized magnet 2 or the inner circumferential surface of the yoke 1, and the magnet 2 is fixed to the inner circumferential surface of the yoke 1. This fixing is performed using the attractive force of the temporarily magnetized magnet 2, making it unnecessary to use a jig. Also, during this fixing, the recess 2a of the magnet 2 and the protrusion 1a of the yoke 1 are engaged,
The magnet 2 is positioned and fixed on the inner circumference of the yoke 1.

In this manner, with the magnet 2 fixed to the yoke 1 by its attractive force, the adhesive interposed between the two is heated and dried to securely bond and fix the magnet 2. The magnet 2 is then re-magnetized to obtain the final magnet performance.

A stator assembled by the above-described assembly method exhibits performance no different from that of conventional stators. According to the above method, there is no need to use a jig, and the assembly work is extremely simple.

In the present invention, the shape and position of the protrusion formed on the yoke and the recess formed on the magnet can be arbitrarily selected as long as the magnet can be positioned with respect to the yoke.

As explained above, the present invention prepares a yoke having a protrusion on its inner circumferential surface and a pre-magnetized permanent magnet having a positioning recess that engages with the protrusion of the yoke. The temporarily magnetized magnet is temporarily magnetized before being assembled to the yoke so that it can function as a magnet, and then the temporarily magnetized magnet is attracted to the inner peripheral surface of the yoke by engaging the protrusion and the recess. The permanent magnet is fixed by force, the adhesive is dried while the magnet is fixed to the yoke by its attractive force, and then the permanent magnet is re-magnetized to obtain the final magnetic performance.
Not only does it not require a special jig to hold the magnet when adhering it, but it is also possible to use special The magnet can be positioned and temporarily fixed on the yoke without using a guide, and the permanent magnet is re-magnetized to obtain the final magnet performance after adhesion, and the permanent magnet before being assembled to the yoke is ,
Since it is only necessary to temporarily magnetize it to have the function as a magnet, there is no need to precisely manage the magnetizing polarity and magnetizing force during temporary magnetization, and temporary magnetization is easy. This has the excellent effect of being able to assemble the stator of a permanent magnet motor.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an example of a stator of a permanent magnet motor assembled by the method of the present invention, and FIGS. 2 and 3 are cross-sectional views of FIG. 1, respectively.1... Yoke, 1a...protrusion, 2...permanent magnet, 2a...recess.

Claims (1)

[Claims] 1. Prepare a yoke with a protrusion on its inner peripheral surface and a pre-magnetized permanent magnet with a positioning recess that engages with the protrusion of the yoke, and make this permanent magnet have a temporary function as a magnet. Preferably, after temporarily magnetizing the magnet before assembling it to the yoke, the temporarily magnetized magnet is filled with an adhesive between the inner peripheral surface of the yoke and the protrusion and recess are engaged. Then, the permanent magnet is positioned and fixed by the attractive force of the magnet, and the adhesive is dried while the magnet is fixed to the yoke by the attractive force, and then the permanent magnet is re-magnetized to obtain the final magnetic performance. A method for assembling a stator of a permanent magnet motor, characterized by: