JPS6051444A - Manufacture of magnetized yoke - Google Patents

Abstract

PURPOSE:To enable to manufacture a permanent magnet which has less irregular magnetization by flowing the prescribed value of magnetizing current by inserting insulating plates between the electrodes after winding a magnetized yoke, and then fixing the windings with resin. CONSTITUTION:A winding 5 is wound on a magnetized yoke 4, an insulating plate 8 is inserted between the windings 5 and 5 of adjacent winding units, a current of 50-70% of the magnetizing current is flowed in the same method as the magnetization. Then, the windings 5 are moved and arranged to reduce a gap in the inward direction of the yoke 4. When the current is thus flowed, the plate 8 is removed after arranging the windings 5 after manually winding, and fixed with resin. If the plate 8 is not inserted at the arranging time by flowing the current, a swell occurs at the winding 5 by the current, a strict arranging cannot be performed, and irregular magnetizing force can occur.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetizing yoke used in the process of making permanent magnets, and improves the positional accuracy of permanent magnet poles, minimizes cogging force, and minimizes rotational unevenness. The present invention relates to a method of manufacturing a magnetizing yoke that makes it possible to realize a small number of motors.

Conventional configuration and problems Figure 1 is a cross-sectional view of the motor part of a record player.
Rotational torque is generated by the permanent magnet 1 and the stator core 2 to rotate the turntable 3. FIG. 2 is a plan view of the permanent magnet 1 and the stator core 2. The stator core 2 has salient poles and is made of high magnetic permeability material, and includes a permanent magnet 1 and a stator core 2.
As a result, the state of magnetic energy between the permanent magnets 1 and the stator core 2 changes depending on the mutual positions of the permanent magnets 1 and the stator core 2, resulting in torque ripples in the rotational direction. This ripple is called cogging force. The rotational unevenness as a comprehensive characteristic of the motor is greatly influenced by the above-mentioned cogging force.

One of the causes of the cogging force is that the permanent magnet 10
There is a problem with magnetization position accuracy. Conventional magnetization involves winding the winding 5 around the magnetizing yoke 4, and then wrapping the winding 5 with an epoxy resin 6.
A fixed version is used. However, when winding the winding 5 around the magnetizing yoke 4, it is very difficult to wind it evenly around the winding part 7, which has the number of poles equivalent to all the poles of the stake core 2. For example, as shown in Fig. 4, gaps 9 often occur between the lines.Objective of the Invention It is an object of the present invention to provide a method for manufacturing a magnetization seek that forms a magnetization yoke having aligned windings in order to make it magnetizable.

Structure of the Invention The present invention involves inserting an insulating plate into the gap between the poles after winding the magnetizing yoke, and passing a current of 50 to 70 times the magnetizing current in the same manner as when the magnetizing current is passed. Measure the alignment of the windings and make them uniform. After that, the insulating plate was removed and the resin winding was fixed, and the winding state of each pole of the magnetizing yoke was made uniform, making the magnetizing force uniform. Therefore, the magnetizing yoke created in this way By magnetizing a permanent magnet, poles can be formed with extremely high positional accuracy.

Description of examples Embodiments of the present invention will be described with reference to FIGS. 5 to 7.

The winding 5 is wound around the magnetizing yoke 4, and the winding 5 of the adjacent winding part is
When an insulating plate 8 is inserted between the magnetizing current and the winding 6, and a current of 50 to 7% of the magnetizing current is passed in the same manner as for magnetizing, the winding 5 is magnetized as shown in FIG. They move toward the inside of the magnetic yoke 4 so as to close the gap and align. Furthermore, since the same current flows through the windings 6 wound on each pole, the windings 5 on each pole are also aligned in the same way. The insulating plate 8 is removed after the manually wound windings are aligned by passing a current in this manner.

If an insulating plate is not inserted during alignment when current is applied, the current will cause the winding 5 to bulge as shown in Figure 7, preventing precise alignment and causing uneven magnetizing force. . That is, it is generally necessary to insert an insulating plate during alignment.

Effects of the Invention The present invention involves winding the poles of a magnetizing yoke, inserting an insulating plate between the poles and passing a current of 60 to 70% of the magnetizing current to align the windings of each pole. Since the wires are fixed with resin, the windings are aligned and a permanent magnet with less uneven magnetization can be created.

Therefore, the 6-page inspection and repair process of measuring the surface magnetic flux density and magnetization waveform of the permanent magnets created in the past, selecting those that failed, and rewinding them can be omitted, and reliability can be improved. High-quality permanent magnets can be easily mass-produced. By obtaining a permanent magnet with high magnetization position accuracy, it is possible to realize a motor with small cogging force and less rotational unevenness, which is a great industrial advantage.

[Brief explanation of drawings]

First, a cross-sectional view of the motor section of the record player, FIG. 2 is a plan view of its main parts, FIG. 3 is a perspective view of the magnetizing yoke, and FIG.
The figure is an enlarged view of the winding portion of a conventional magnetizing yoke, FIG. 6 is a perspective view of an embodiment of the manufacturing method of the present invention with an insulating plate inserted, and FIG. 6 is a view of the aligned winding portion. The enlarged view, FIG. 7, is an enlarged view showing the state after 60 to 70% current was passed through the winding without inserting an insulating plate. 4... Magnetizing yoke, 5... Winding wire, 7...
...Winding section, 8...Insulation plate. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Catalog 3 Figure 4 Figure name 5 Figure 6

Claims (1)

[Claims] Windings are applied to the winding portions that will each become magnetized poles, an insulating plate is inserted between adjacent winding portions, and a current of 50 to -ro% of the magnetizing current is applied to align the windings of each winding portion. A method for manufacturing a magnetizing yoke, further comprising fixing the winding with resin.