JPS62104459A - Manufacture of rotor for synchronous motor - Google Patents

Abstract

PURPOSE:To enable a rotor to be produced at a low cost in mass production system, by forming a plurality of magnet materials with a plate-formed magnet base, and by forming a housing and a motor shaft integrally with the respective magnet materials, or with a toothed gear for output if required. CONSTITUTION:A plurality of magnet materials 1 are made of a magnet base and are magnetized. After that, a housing 8 and a motor shaft 2 are formed integrally with the respective magnet materials 1 by using synthetic resin. If required, the motor shaft 2 is integrally formed with a toothed gear 4 for output. Then, the synthetic resin to be employed may be various kinds of engineering resin of polyamide resin, polyacetal resin, polycarbonate resin, or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a method for manufacturing a rotor used in a synchronous motor.

[Prior Art 1] Conventionally, a magnet used in a rotor of a synchronous motor has a hole connected to the magnet, and a motor shaft 11) is press-fitted or glued into the magnet.

The magnet has a hole through which the motor shaft is inserted.
In the J method, holes were carved into the mold during the powder compaction process using a magnet.

[Problems to be Solved by the Invention] However, as in the above-mentioned conventional manufacturing method, drilling holes in the mold is difficult for isotropic magnets.
"A perforated magnet is obtained because it is magnetized after the culm has finished. However, if the shape is the same, a heterogeneous magnet can provide a larger rotational torque than an isotropic magnet when incorporated into an electric motor. During the molding stage, the hexagonal plate-shaped ferrite crystals must be aligned in a certain direction by preliminary magnetization.

At this time, in a small magnet, if the difference between the outer diameter and the inner diameter, that is, the total length is larger than the wall thickness, the compaction stress of the powder 1] -
The amount of pressure increases, making it difficult to apply uniform pressure to the entire surface. As a result, the rotor could not obtain an appropriately strong magnetic field in the radial direction relative to the axis.

In addition, since it is usually difficult to perform processing other than grinding with a cutter such as a drill, drilling with a cutter such as a drill is rarely performed.

Therefore, the outer diameter is around 15 mm, the inner diameter is around hgiI1, and the total length is about 30 IIl^r (the later small VikE was difficult to mold and could not get the proper strong magnetic field.

As a result, the rotor has either a weak magnetic field or a very
It was necessary to use a magnet with a value <r of 21.

[Objective of the Invention 1] An object of the present invention is to provide a method for manufacturing a rotor for a synchronous motor that is excellent in mass productivity and low speed in view of the above-mentioned conventional drawbacks.

[Problem solved/: 1st stage 1 For this reason, the present invention forms a WH+ material having a rectangular prism shape and smooth end faces from a plate-shaped magnet base material.
:... H material is plated to form the magnet 11 - [The culm and part or the entire outer surface of the magnet are coated with synthetic resin, and the end face number J axis part is the same as the previous 811 synthetic resin. The process of integrally molding the trochanter with resin constitutes the manufacturing method of the trochanter that is attached to the synchronous motor.

[Example 1 Hereinafter, one embodiment of the method of the present invention will be described with reference to the drawings.

. FIG. 1 LL(a) to J(C) are J perspective views showing the shape of 11i'fi, and FIGS. 2 and 3 are perspective views showing insert-molded rotors, and sintering technology or [For example, 150CRIX90C1lX141111
Create a magnetic f'i M shrine from
As shown in No7I5(C), this rectangular parallelepiped magnet base material 6
24 pieces of magnetism consisting of 80×13×13III are also material 1
Create. Next, a strong magnetic field is applied to each magnet cable 1 to magnetize each magnet 71 cable 1. In this way, a large number of W)
It is possible to produce a large rectangular parallelepiped magnet base material, such as one in which the fj cable material 1 is integrated, and cut out the magnet MttA to obtain a magnet of a size similar to Tokyo. Also, the square C of square t1
Chamfering (2) and R (2) are performed using a grinder (T), so that the magnetic cord material 1 with excellent mass productivity can be supplied.

Next, for each magnet material 1 formed in step 1-,
The outer cover 8 and the motor shaft 2 are integrally molded in synthetic resin. Examples of the synthetic resin used at this time include polyamide resin (nylon 66), boria 1=tar resin, and polycarbonate resin.

- Each IIf of resin etc. Any resin may be used as long as it is an i-ring resin. Fig. 2 (εl) and (t)) show the magnetic filament 1 and the motor shut 2 integrally molded, and Fig. 3 (a)-(b) and Fig. 7-tersha 71-2. The output tooth center 4 is integrally molded and is 1J.

In this way, in this embodiment, a large number of magnet materials 1 are formed from a 1L plate-shaped magnet 1, and an outer cover 8 and a motor 91-2 are attached to each 117" I-shaped wire 1, and outputs are provided as necessary. By integrally molding the teeth Ii4, there is no hole in the end surface into which the motor shaft 2 is inserted.

Therefore, a rotor having a high magnetic field can be manufactured in ms and at low cost.

[Effects of the Invention 1] Therefore, the present invention provides a method for manufacturing a rotor in a synchronous motor that is excellent in mass productivity and low cost. It is possible to provide

[Brief explanation of drawings]

Figures 1 (a) to (C) are! A perspective view showing IH magnet cables,
Figures 2 (a) and (b) are perspective views of a rotor in which a part of the motor is integrally molded into a magnetic material, and Figures 3 (8) and (b)
1 is a perspective view of a rotor in which a motor shaft and an output gear are integrally molded on a magnet material. In the figure, 1 is a magnetic material, 2 is a motor shaft, 4 is an output tooth width, and 8 is an outer cover. Patent applicant: Kunimori Chemical Co., Ltd. Agent: Ken Ito - Figure 1 (a) (b) (C)

Claims (1)

[Claims] (1) A step of forming a magnet material having a rectangular prism shape and a smooth end surface from a plate-shaped magnet base material, a step of magnetizing the magnet material to form a magnet, and a step of forming a magnet material on an outer surface of the magnet. 1. A method of manufacturing a rotor for a synchronous motor, comprising the steps of: coating the rotor partially or entirely with a synthetic resin, and integrally molding a shaft portion on the end face with the same resin as the synthetic resin.