JPS63133855A - Manufacture of motor - Google Patents

Abstract

PURPOSE:To balance the rotation of a motor easily and surely, by forming grooves on the outer periphery of a ring to make them a guide for effecting drilling work. CONSTITUTION:A core 7 is formed on the shaft 6 of a motor while permanent magnets 8 are mounted on the outer diametral side of the core 7. Rings 9, made of iron, are attached to both side end surfaces of the permanent magnets 8 and grooves 10 are formed on the outer periphery of the rings 9. The bias of the weight of a rotor, which is checked by a balance machine, is corrected by drilling work 11 applied on the rings 9. The drilling work 11 may be applied at substantially the axial center of said grooves 10 to bore a hole, therefore, the positioning of the hole may be effected easily. As a result, the amount of cutting of the drilling work 11 may be increased and the correction of unbalance may be effected easily.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method of manufacturing an electric motor in which a rotor is formed by mounting a permanent magnet on a shaft.

"Prior Art" A method of manufacturing an electric motor in which a rotor is formed of permanent magnets adjusts the balance of the rotational direction in a process before magnetizing the permanent magnets.

Conventionally, the simplest way to adjust this balance is to drill holes in areas that do not affect the characteristics to balance the weight with respect to the shaft.

For example, as shown in FIGS. 3 and 4, the core 2 is attached to the shaft 1 of the rotor, and the permanent magnet 3 is attached to the outer periphery of the core 2. Then, the side surface of the core 2 is drilled 4. It's something.

Generally speaking, when the diameter of the rotor becomes smaller, as shown in FIG. 4, a balance ring 5 is attached to the side surface of the permanent magnet 3, and the drilling process 4 is performed.

Such drilling 4 is convenient in that the balance of the rotor can be easily and reliably balanced by 1q.

However, when the rotor diameter becomes smaller and the shaft 1
If the aperture becomes long, the shaft 1 will become an obstacle during aperture machining 4, which will not only make machining difficult, but will also require the use of a thin and long aperture, resulting in problems such as the aperture breaking. do.

Furthermore, in the embodiment shown in FIG. 4, if a deep hole is made in the axial direction, there is a risk of damaging the permanent magnet 3, and therefore, it is necessary to control the drilling process.

Therefore, it can be said that it is difficult to manufacture a motor with a particularly small diameter.

"Problems to be Solved by the Invention" The present invention has been made in view of the above circumstances.
The object of the present invention is to provide a method for manufacturing an electric motor (1) that can easily and reliably achieve rotational balance even with a rotor having a small diameter.

"Means for Solving the Problem" The present invention provides a ring on the side surface of a permanent magnet, forms a groove around the outer circumference of the ring, and uses this groove to perform drilling in the axial direction to obtain balance. The problem is solved by.

``Operation'' Since a groove is formed on the outer periphery of the ring, when drilling, the groove serves as a guide for the drill, making it possible to drill a hole with a diameter close to the width of the ring.

Therefore, a large amount of balance can be easily obtained, and manufacturing of a small and lightweight electric motor becomes extremely easy.

``Example'' The present invention will be described based on an example shown in the drawings. FIG. 1 is a vertical cross-sectional view of a main part showing an example of the method for manufacturing an electric wjer of the present invention, and FIG. is a radial cross-sectional view for understanding the state.

In FIG. 1, in the method of manufacturing an electric motor, an iron core 7 is formed on a shaft 6, and a permanent magnet 8 is attached to the outer diameter side of the iron core 7.

A ring 9 is attached to both end surfaces of the permanent magnet 8, and a groove 10 is formed on the outer periphery of the ring 9 at the center in the width direction.

In Figure 2, the ring 9 is drilled 1 in the axial direction.
1, and the diameter of the drill bit 12 is thick, close to the width of the ring 9.

In such a configuration, the manufacturing method of the electric motor is to attach the iron core 7 to the @6, attach the permanent magnet 8 to the outer periphery of the iron core, and assemble the motor by providing rings 9 at both ends.

Then, check for unbalance due to rotation and correct it.

This balance correction is performed by actually rotating a device called a balance machine to check for unbalanced weight, and it shows the deviation and position of the amount that causes unbalance. .

In order to correct the weight imbalance detected using the balance machine, the ring 9 is drilled 11.

This drilling process 11 can be performed using a drill 12 having a diameter close to the width of the ring 9, since the hole can be made approximately at the center in the axial direction by the groove 10 on the outer periphery of the ring 9.

Therefore, the amount of cutting by the drilling process 11 increases, and the balance correction effect increases, so that the balance can be corrected very easily without having to drill a plurality of holes.

Further, since the drilling process 11 can be efficiently performed on the width of the ring 90, the width of the ring 9 can be reduced, and the sacrifice of the length in the axial direction can be minimized.

Furthermore, in the drilling process 11, the outer periphery of the ring 9 is different from a simple curved surface and has a groove 10 formed therein, so that when the drill bit 12 comes into slight contact with the groove 10, a non-slip cutting surface is created to prevent slippage.

Therefore, there is no problem with the tip of the awl 12 slipping.
Drilling becomes easier, and a worker who does not get angry can easily perform the drilling.

Moreover, since the drill 12 with a large diameter can be used, there is less risk of breakage, and an extremely favorable state can be obtained as a manufacturing method.

"Effects of the Invention" According to the present invention, a method for manufacturing an electric motor that can easily and reliably balance rotation even with a rotor having a small diameter can be improved by 1q. This is extremely large in electric motors.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a main part showing an embodiment of the method of manufacturing an electric motor according to the present invention, and FIG. 2 is a radial sectional view for understanding the state. FIGS. 3 and 4 are diagrams showing conventional embodiments. 6... Shaft, 7... Iron core, 8... Permanent magnet,
9...Ring, 10...Groove, 11...Killing, 12...Kill 1.

Claims (1)

[Claims] In a method of manufacturing an electric motor in which a rotor is formed by attaching a permanent magnet to the shaft, a ring is provided on the side of the permanent magnet, a groove is formed on the outer periphery of this ring, and this groove is used to perform drilling in the axial direction. A method for manufacturing an electric motor characterized by obtaining a balance by performing the following steps.