JP2001231200A - Protective structure of permanent magnet rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a protective structure of a permanent magnet rotor which is superior in productivity and free from loss of motor function and deterioration of characteristic. SOLUTION: In the permanent magnet rotor 1 wherein a plurality of field permanent magnets 4 are mounted at equal intervals on the outer peripheral surface of a rotor yoke 3, the outer peripheral surface of the field permanent magnets 4 is covered with a cylindrical protective net 5 of stretch mesh type.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protection structure for a permanent magnet rotor in which a plurality of field permanent magnets are mounted at equal intervals on an outer peripheral surface of a rotor yoke.

[0002]

2. Description of the Related Art In a conventional permanent magnet rotor used for a permanent magnet type electric motor, a plurality of field permanent magnets are mounted at equal intervals on an outer peripheral surface of a rotor yoke fitted and fixed to a rotating shaft. While placing, on the outer peripheral surface of the field permanent magnet, or wrap a protective tape, or cover the heat shrink tube,
A magnet protection layer was formed to prevent the field permanent magnet from scattering during rotation.

[0003]

However, the prior art has the following problems. (1) When wrapping the protective tape around the outer peripheral surface of the field permanent magnet, the start and end of the protective tape must be fixed with jigs, etc. For the purpose of fixing the outer peripheral surface, it is necessary to wind while applying tension, so that the productivity is extremely low. (2) When the heat-shrinkable tube is placed on the outer peripheral surface of the field permanent magnet, there is no fixing means between the heat-shrinkable tube and the field permanent magnet. In this case, the permanent magnets can be prevented from scattering, but the function of the electric motor is lost because the rotor magnetic poles are shifted. In addition, due to manufacturing restrictions on the thickness of the heat-shrinkable tube, as the diameter of the rotor increases, the thickness of the heat-shrinkable tube increases, so that the air gap between the rotor and the stator increases, and Characteristics are degraded. The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a protection structure for a permanent magnet type rotor that has good productivity, does not lose the motor function, and does not deteriorate its characteristics. Things.

[0004]

In order to solve the above-mentioned problems, the present invention provides a permanent magnet rotor having a plurality of field permanent magnets mounted at equal intervals on the outer peripheral surface of a rotor yoke.
The outer peripheral surface of the field permanent magnet, a glass fiber, a fiber that can be impregnated with a resin or an adhesive, a metal fiber, or a stretchable mesh made of a metal fiber or the like coated with a resin or an adhesive on the surface, And it is made to cover with a cylindrical protection net.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view illustrating a process of manufacturing a permanent magnet rotor according to an embodiment of the present invention, and FIG. 2 is a perspective view illustrating a completed permanent magnet rotor. In FIG.
In the permanent magnet rotor 1, a rotor yoke 3 is fitted and fixed on the outer peripheral surface of a rotating shaft 2, and a plurality of field permanent magnets 4 are mounted on the outer peripheral surface of the rotor yoke 3 at equal intervals. It is configured. The field permanent magnet 4 is fixed on the outer peripheral surface of the rotor yoke 3 by, for example, an adhesive. Numeral 5 is an elastic net-like and tubular protective net, for example,
It is made of glass fibers, fibers impregnable with a resin or an adhesive, metal fibers, metal fibers coated with a resin or an adhesive on the surface, and the like. The inner diameter is set smaller than the outer circumference of the field permanent magnet 4. ing. The protection net 5 extends radially and axially as shown by an arrow A and covers the outer peripheral surface of the field permanent magnet 4. After the protection net 5 is covered, tension is applied to the protection net 5 itself and the field permanent magnet 4 So that it does not move before it is fixed. Therefore, unlike the related art using a protective tape, there is no need to perform a process such as fixing the winding start portion and the end portion of the tape with a jig, and the productivity is greatly improved.
The protective net 5 covering the permanent magnet rotor 1 is adhesively hardened on the outer peripheral surface of the field permanent magnet 3 to form a protective layer for preventing magnet scattering. Thereby, auxiliary fixing between the rotor yoke 3 and the field permanent magnet 4 is also possible. Therefore, even when the rotor yoke and the field permanent magnet are fixed by an external force or the like, the outer periphery of the field permanent magnet is fixed by the protection net 5, so that the magnetic pole of the rotor does not shift. However, the function as a motor is not lost. Further, since the protective net 5 is made of the same material as the protective tape, the thickness of the protective layer does not change even if the outer diameter of the rotor increases, so that the air gap between the rotor and the stator is reduced. There is no change, and the characteristics of the motor do not deteriorate. In the present invention, the rotor yoke 3 does not necessarily need to be formed of a member separate from the rotating shaft 2.
The outer diameter of the rotating shaft may be increased to be integrally formed.

[0006]

As described above, according to the present invention, the following effects can be obtained. (1) The protection net can be mounted on the permanent magnet rotor without using a jig, etc. And increase productivity. (2) Since the protection net and the field permanent magnet adhere to each other, the fixation of the field permanent magnet to the rotor yoke is strengthened, so that the field permanent magnet does not move on the rotor yoke and the function of the motor is lost. I can't. (3) Since the thickness of the protection net does not change even if the size of the rotor increases, the air gap between the rotor and the stator does not change, and the characteristics of the motor do not deteriorate.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a manufacturing process of a permanent magnet rotor according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a completed permanent magnet rotor.

[Explanation of symbols]

 1 permanent magnet rotor, 2 rotating shaft, 3 rotor yoke, 4 field permanent magnet, 5 protection net

Claims (2)

[Claims] 1. A permanent magnet rotor having a plurality of field permanent magnets mounted at equal intervals on an outer peripheral surface of a rotor yoke, wherein an outer peripheral surface of the field permanent magnet is formed in a stretchable mesh shape,
A permanent magnet rotor protection structure characterized by being covered with a cylindrical protection net. 2. The protection net according to claim 1, wherein the protection net is made of glass fiber, a fiber impregnable with a resin or an adhesive, a metal fiber, or a metal fiber having a surface coated with a resin or an adhesive. 2. The protection structure for a permanent magnet rotor according to 1.