JPH045803A - Magnetization apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetizing device used to magnetize, for example, a cylindrical multipolar magnet for a motor.

(Prior art) As magnetizing devices for magnetizing cylindrical multi-pole magnets for motors, etc., there are disclosed Utility Model Application No. 62-4109 and Utility Model Application No. 63-79.
The configuration shown in Publication No. 611 is typical. This type of magnetizing device is called a magnetizing yoke, and a cylindrical yoke (made of a ferromagnetic material such as pure iron) is provided with dimensions such that the cylindrical magnet material fits snugly into the inner circumference of the yoke. The inner peripheral surface of (
A large number of wiring grooves in the axial direction are formed at regular intervals on the contact surface of the material to which the magnetized surface of the magnet material is joined, and the excitation conducting wire is fitted into the wiring grooves.

(Problems to be Solved by the Invention) As mentioned above, conventional magnetizing devices have excitation wires wired around a yoke made of ferromagnetic material such as pure iron, and magnetization occurs when a large current is passed through the excitation wires. A yoke is used as a magnetic core to effectively and efficiently generate lines of magnetic force for magnetizing the magnet material using a magnetic field. Since a yoke made of pure iron or the like is conductive, it is necessary to properly insulate the excitation conductor from the yoke, and various methods have been devised to insulate the conductor from the yoke, as in the above-mentioned published utility model publication.

In the case of a cylindrical multipolar magnet for a small stepping motor, for example, as many as 44 magnetic poles are formed at a constant pitch along the circumference on the outer periphery of a cylindrical body with a diameter of about 30 mm. In this case, the pitch of the magnetic poles on the circumferential surface of the magnet is extremely small, about 1 + nm. In a conventional magnetizing yoke for magnetizing such a magnet, wiring grooves are formed at a pitch of approximately 1 mm in a yoke having an inner diameter of approximately 30 mm, and excitation conductors are attached to the wiring grooves. In such a small device, it is very troublesome to insulate the conductive wires in each groove from the yoke, and the distance between the conductive wires and the yoke for insulation becomes extremely small. Then, by discharging the capacitor charged to several thousand volts, a pulse current of 1,000 amperes is instantaneously passed through the excitation conductor to effect magnetization. Because such an extremely high voltage is applied, the insulating layer covering the excitation conductor is likely to be destroyed, and a short circuit between the yoke and the conductor due to dielectric breakdown is likely to occur even after a relatively short period of use. Therefore, it is necessary to limit the excitation current flowing through the conductor, which makes it impossible to obtain the necessary magnetomotive force.

This invention was made in view of the above-mentioned conventional problems, and its purpose is to make dielectric breakdown less likely to occur even when a large excitation current is passed in a magnetizing device in which the interval between excitation conductors is extremely small.

(Means for Solving the Problems) Therefore, in this invention, the yoke made of a high magnetic permeability material such as pure iron is abolished, and a magnetizer main body made of an insulating material having the same shape as the yoke is provided. The excitation conductor was fitted into the wiring groove of the main body.

(Function) The magnetizer main body made of an insulating material does not function as a magnetic core like a yoke made of a high magnetic permeability material, but functions as a holder for the excitation conductor and attaches the magnet material to the wiring pattern of the excitation conductor. It functions as a jig for easy positioning.

In a magnetizing device in which excitation conductors are wired extremely densely, lines of magnetic force are generated in a predetermined pattern on the surface of the magnetizer main body that faces the material, even if the path of the lines of magnetic force is not controlled by a yoke (even if there is no yoke). .

(Embodiment) FIG. 1 shows an overall outline of a magnetizing device according to an embodiment of the present invention, and FIGS. 2 and 3 show the configuration of its main parts in detail.

Reference numeral 1 denotes a cylindrical magnetizer body mounted on a base 2. The magnetizer main body 1 is made of an insulating material such as alumina, ceramics, or plastic, and a cylindrical magnet material is fitted to the inner periphery of the magnetizer main body 1. This becomes surface 1a.

A large number of wiring grooves 1b extending linearly in the axial direction are formed at a constant pitch on the inner peripheral surface of the magnetizer main body 1 made of an insulating material. Assuming that the diameter of the magnetizer body 1 is 30 m1 and the number of wiring grooves 1b is 48, the pitch of the wiring grooves 1b on the circumferential surface is approximately 1.
It becomes mm.

A continuous excitation conductor 4 is folded back and fitted into the wiring groove 1b. Note that the gap between the excitation conducting wire 4 and the wiring groove 1b is filled with a coating layer 3 such as an adhesive or a flexible coating tube. The covering layer 3 is of course made of an insulating material.

Both ends of the continuous excitation conductor 4 are connected to the cord 5,
It is fixed with a cord presser 6 on the base 2, and is further pulled out from the cord presser 6 and has a terminal 7 attached to its tip.

(Effects of the Invention) As explained in detail above, in this invention, the yoke made of a high magnetic permeability material in a conventional magnetizing device is replaced with a magnetizer main body made of an insulating material. This eliminates the need for troublesome insulation between the parts and eliminates the problem of easy dielectric breakdown in this part. Of course, it is necessary to provide insulation between adjacent conductor wires, but insulation between conductor wires is much easier than insulation between a conductor and a yoke, and dielectric breakdown is less likely to occur. Furthermore, the magnetizer body made of an insulating material does not function as a yoke made of a high magnetic permeability material and has inferior magnetic properties, but it is possible to instantaneously apply an excitation current of 1000 amperes to a small magnetizer as described above. Even with a yoke, a flowing type will easily become magnetically saturated, so the difference from a type without a yoke like the present invention is not so large.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the overall schematic configuration of a magnetizing device according to an embodiment of the present invention, FIG. 2 is a cutaway perspective view of the main parts of the same magnetizing device, and FIG. 3 is a flat cross-sectional view of the main parts. It is a diagram. 1... Magnetizer main body 1b... Wiring groove 3... Covering layer 5... Code 7... ...Terminal 1a...Material contact surface 2...Base 4...Excitation conductor 6...・Cord presser

Claims (1)

[Claims] A material facing surface is formed to which the magnetized surface of the magnet material to be magnetized is bonded to the magnetizer main body made of an insulating material, and a large number of magnetic poles are formed on this material facing surface to match the magnetic pole pattern to be magnetized. A magnetizing device characterized in that wiring grooves are formed at predetermined intervals, and an excitation conductor is fitted and mounted in the wiring grooves.