JPH05328677A - Manufacture of linear motor field part - Google Patents

Abstract

PURPOSE:To make easy magnetization possible by arranging adjacent magnetic bodies in the manner of the magnetic bodies protruding in reverse directions and by bringing the magnetic poles of a magnetizer into contact with the parts protruding to one side of the magnetic bodies to perform magnetization. CONSTITUTION:In the structure of a field part 1, magnetic bodies 11a, 11b and unmagnetized permanent magnets 12a, 12b are laminated and arranged at equal spaces alternately in specific directions. The magnetic bodies 11a, 11b protrude alternately in the directions at right angles to the direction of lamination with the permanent magnets 12a, 12b. When the magnetizing poles 21a, 21b of a magnetizer 2 are brought into contact with both protruding parts of the magnetic bodies 11a, 11b being the magnetic poles of the field part 1 and a pulse current is caused to flow through a magnetization winding 22, the permanent magnets 12a, 12b are magnetized so that the directions of the magnetic fields of the adjacent permanent magnets holding the magnetic bodies 11a, 11b between are reversed. Thus, it is possible to decrease self- demagnetization and to make magnetization easy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an OA for an industrial robot.
The present invention relates to a method for manufacturing a field portion of a linear motor used for other purposes.

[0002]

2. Description of the Related Art Conventionally, a magnetic field portion used in a linear motor or the like has been manufactured by magnetizing as shown in FIG. That is, after a plurality of magnetic bodies and non-magnetized permanent magnets are alternately laminated and arranged in a specific direction at equal intervals, and molded, the field magnet portion 1 is formed on the field magnet portion as shown in FIG. FIG. 3 shows a magnetizer 2 having magnetizing magnetic poles 21a and 21b having the same pitch as the magnetic pole pitch of FIG.
Magnetization is performed by contacting and fixing as shown in (b), and applying a large pulsed current to the magnetizing winding 22. Alternatively, a molding method has been used in which a permanent magnet is magnetized and then laminated and arranged alternately with a magnetic material.

[0003]

However, according to the conventional method of assembling the field magnet portion and then magnetizing it, the magnetizing magnetic poles having the same pitch as the magnetic pole pitch of the field magnetizing portion, and the magnetizing magnetic poles. At least one of the two requires a magnetizing winding that allows a magnetizing current to flow. In addition, if the magnetic pole pitch of the field part is small, the magnetic pole pitch of the magnetizer and the space in which the magnetizing winding can be wound become smaller,
It becomes difficult to manufacture a magnetizer. Therefore, the positions of the magnetic pole of the field magnet and the magnetic pole of the magnetizer must be properly aligned, and there is also a problem that the positioning is difficult. On the other hand, in the method in which the permanent magnets are magnetized and then the field portions are combined and molded, the assembling work becomes difficult due to the repulsive force between the adjacent permanent magnets arranged with the magnetic body sandwiched therebetween. When a permanent magnet having a bending point in the second quadrant of the magnetic characteristic curve is used, self-demagnetization occurs due to an increase in magnetic resistance at the time when the permanent magnet is magnetized and then becomes a single magnet depending on the dimensions of the permanent magnet.
The magnetic flux density of the permanent magnet may decrease. The present invention is
It is an object of the present invention to provide a method for manufacturing a linear motor field part which solves these problems and which is less susceptible to self-demagnetization and can be easily magnetized.

[0004]

In order to solve the above problems, therefore, in the method of manufacturing a linear motor field part, the length of the magnetic body in the direction perpendicular to the specific direction is made longer than the length of the permanent magnet. In addition, when alternately stacking unmagnetized permanent magnets, the adjacent magnetic bodies are arranged so as to protrude in opposite directions. A method is used in which the S pole of the magnetizer is brought into contact with the magnet for magnetization, and then the protruding portion of the magnetic body is cut.

[0005]

According to the above method, the number of magnetizing magnetic poles of the magnetizer is sufficient to be two, and the magnetizing winding is also one, no matter how many permanent magnets and magnetic bodies are alternately arranged. As a result, the manufacture of the magnetizer is simplified, and since it is not necessary to accurately align the magnetic poles of the magnetic field portion and the magnetic poles of the magnetizer, the magnetizing work is simplified. Further, even after the magnetization, the permanent magnet and the magnetic body are alternately assembled to each other to have a low magnetic resistance, and the permanent magnet does not become a single body.

[0006]

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing a magnetized state of the field magnet portion. In the figure, 1 is a field part, 2 is a magnetizer. The magnetic field is magnetic body 1
It has a structure in which 1a and 11b and unmagnetized permanent magnets 12a and 12b are alternately laminated and arranged in a specific direction at equal intervals. The magnetic bodies 11a and 11b alternately protrude in a direction perpendicular to the stacking direction with the magnet. The magnetizing magnetic poles 21a and 21b of the magnetizer 2 are brought into contact with both protruding portions of the magnetic bodies 11a and 11b, which are the magnetic poles of the field magnet unit 1, so that a pulsed current flows through the magnetizing winding 22. As a result, the permanent magnets 12a and 12b are magnetized so that the magnetic fields of adjacent objects sandwiching the magnetic bodies 11a and 11b have opposite magnetic field directions. After the permanent magnets 12a and 12b are magnetized, the magnetic bodies 11a and 11b are magnetized.
By cutting off the protruding portion, the field portion 1 as shown in FIG. 2 is obtained.

[0007]

As described above, according to the present invention, when the length of the magnetic material in the direction perpendicular to the specific direction is made longer than the length of the permanent magnet, and the permanent magnets which are not magnetized are alternately laminated. , The adjacent magnetic bodies are arranged so as to protrude in the opposite direction, and the magnetic pole of the magnetizer is brought into contact with the portion protruding to one side of the magnetic body for magnetization, so there is little self-demagnetization and There is an effect that it is possible to provide a method of manufacturing a linear motor field part that is easy to manufacture.

[Brief description of drawings]

FIG. 1 is a perspective view showing a magnetized state of a field unit of the present invention.

FIG. 2 is a perspective view of the field magnet portion of the present invention.

FIG. 3A is a perspective view of a conventional magnetizer, and FIG. 3B is a side view showing a magnetized state by the conventional magnetizer.

[Explanation of symbols]

1: Field part 11a: Magnetic body which becomes a magnetic pole of N pole after magnetization of a permanent magnet 11b: Magnetic body which becomes magnetic pole of S pole after magnetization of a permanent magnet 12a, 12b: Permanent magnet 2: Magnetizer 21a: Magnetized A magnetic pole that becomes an N pole when a magnetizing current flows in the magnetic winding 21b: A magnetic pole that becomes an S pole when a magnetizing current flows in the magnetizing winding 22: A magnetizing winding

Claims (1)

[Claims] 1. A method for manufacturing a linear motor field part in which a plurality of magnetic bodies and permanent magnets are alternately arranged in a specific direction at equal intervals, and the magnetic body serves as a magnetic pole. The length in the direction perpendicular to the direction is made longer than the length of the permanent magnet, and when alternately laminated with the permanent magnet in a non-magnetized state, the adjacent magnetic bodies are arranged so as to protrude in the opposite direction. Then, the N pole of the magnetizer and the S pole of the magnetizer are brought into contact with the protruding portion of the magnetic body and the S pole of the magnetizer, respectively, and then the protruding portion of the magnetic body is cut. A method for manufacturing a characteristic linear motor field portion.