JPH1126225A - Manufacture of multipolar magnet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing polar magnet by which the angle of the N and S poles of a multipolar magnet to the center of rotation can be set accurately and either an isotropic magnet material or an anisotropic magnet material can be used for forming the magnet, and then the manufacturing cost of the magnet can be reduced by simplifying the manufacturing process of the magnet. SOLUTION: A polar magnet is manufactured through a step (a) of magnetizing a plurality of nearly square platy magnet materials in N and S poles in fixed directions along their side faces, a step (b) of piling up magnetized platy magnets 3a, 3b, and 3c upon one another by shifting their N-S pole directions by prescribed angles and bonding the magnets 3a, 3b, and 3c to each other, and a step (c) of cutting the laminated magnet 4 into small cubes in orthogonal directions perpendicular to the laminating direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a multi-pole magnetized magnet, and more particularly to a multi-pole magnet used for a rotor of a stepping motor used in an electronic timepiece, an electronic computer, and peripheral devices thereof. And a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, as a multi-pole magnet used for a rotor of this type of electronic timepiece motor, for example, as shown in FIG. 6, disk magnets 1a and 1a having NS poles in the radial direction are used.
There has been a device in which a plurality of 1b and 1c are superposed to form a multipole (Japanese Patent Application Laid-Open No. 50-98614). By superposing a plurality of disk magnets 1a, 1b, 1c in this manner, a multipole magnet 2 in which NS poles are alternately arranged is produced as shown in the plan view of FIG. This multi-pole magnet 2
For example, a method of performing two-pole magnetization in the radial direction on three disk-shaped magnet materials, for example, and setting the NS poles of the three disk magnets 1a, 1b, 1c around the center of the disk 60 for
And a step of bonding to each other at a shifted position and overlapping each other.

As shown in FIG. 8, a conventional multi-pole magnet 2 is made of an anisotropic magnet material, and N and S poles are alternately formed plural times in a disk-shaped radial direction. There was also a multipole magnet 2 made by a magnetizing method.

[0004]

However, this kind of multi-pole magnet 2 has a deviation angle of the magnetic pole with respect to the center of the disk,
For example, in the case of FIG. 7, it is desired that N and S are set accurately by 60 °. However, in the method of manufacturing the conventional multipolar magnet 2 as shown in FIG. Plate magnet 1
Since a, 1b, and 1c are used, it is difficult to accurately set the deviation angle of the magnetic pole with respect to the center of the disk when bonding. In addition, there is a problem that the man-hours are required for laminating and bonding the disk magnets 1a, 1b, and 1c for each of the multipolar magnets 2, thereby increasing costs.

In the method of manufacturing the multipolar magnet 2 as shown in FIG. 8, the number of times of magnetization increases with an increase in the number of magnetic poles. Only an anisotropic magnet material could be used, and an isotropic magnet material could not be used.

Accordingly, the present invention can accurately set the angle of the NS pole with respect to the rotation center of the multipole magnet, and can use either an isotropic magnet material or an anisotropic magnet material as the magnet material. It is an object of the present invention to provide a method for manufacturing a multipolar magnet which can be manufactured, and can reduce the cost by simplifying the manufacturing process.

[0007]

In order to solve the above-mentioned problems, a method of manufacturing a multi-pole magnet according to a first aspect of the present invention is directed to a method of manufacturing a multi-pole magnet, in which a plurality of substantially square plate-like magnet materials are used. Magnetizing the NS poles in a fixed direction on the side surface of the slab, superposing the plurality of magnetized plate magnets while shifting the direction of the NS poles by a predetermined angle, and adhering to each other; Cutting in a dice pattern in a direction orthogonal to the overlapping direction.

The method of manufacturing a multi-pole magnet according to claim 2 of the present invention includes a step of magnetizing a plurality of substantially square plate-like magnet materials by shifting the NS poles by a predetermined angle in the side direction. Superposing the plurality of magnetized plate magnets so that the sides of the substantially square are aligned and shifting the direction of the NS pole by the predetermined angle, and bonding the magnets together; Cutting in a dice shape in a direction orthogonal to the direction.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for manufacturing a multipolar magnet according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a first embodiment of the manufacturing method according to the present invention. First, as shown in FIG. 1A, in a step of magnetizing three plate-shaped magnet materials formed into a square having the same dimensions, a magnetic field is applied in a diagonal direction of each of the plate-shaped magnet materials to oppose each other. Three plate magnets 3 with NS poles magnetized at the corners
a, 3b and 3c are manufactured. Since the direction of the NS pole is magnetized in only one direction, the magnet material is platinum.
Any of a cobalt isotropic magnet material, a samarium / cobalt anisotropic magnet material, and a neodymium / iron / boron magnet material may be used. The plate magnet is manufactured by various methods most suitable for each magnet material, such as a casting method, a sintering method, and a super-quenching method.

Next, as shown in FIGS. 1 (b) and 2, the three magnetized plate magnets 3a, 3b, 3c are connected to the respective N poles with the center points 6 of the squares aligned. The laminated magnets 4 are manufactured by overlapping each other and each S pole so as to be shifted from each other by 120 °, and bonding with an epoxy-based adhesive. In this case, since the positioning can be performed using the corners of the square, the directions of the NS poles can be accurately shifted by 120 ° for bonding.

Finally, as shown in FIG. 1C, the superposed laminated magnets 4 are cut into a dice pattern by wire discharge or dicer. By cutting the three plate magnets 3a, 3b, 3c in a state of being stacked, the plate magnets 3a, 3b, 3c are cut.
Are completed in three layers to complete a dice-shaped multipole magnet 5.
FIG. 3 is a plan perspective view of the multipole magnet 5 cut in a dice pattern. Even if the magnets are cut in a dice pattern, each of them has NS poles again, so the multi-pole magnet 5 laminated in three layers has N poles and S poles alternately at every rotation angle of 60 ° from the center point 7 of the square. This results in a six-pole multi-pole magnet 5. Thus, the multipole magnet 5 can be mass-produced at a time by cutting in a dice shape. In this embodiment, the rotor is cut into a square shape, but by cutting into a disk shape, a circular multi-pole magnet for a rotor similar to the conventional one can be manufactured. Further, in the present embodiment, the multi-pole magnet 5 is formed by laminating three plate magnets 3a, 3b, 3c. However, if the multi-pole magnet is laminated according to the required number of poles, a multi-pole magnet having an arbitrary number of poles can be formed. Can be manufactured.

FIG. 4 shows a second embodiment of the manufacturing method according to the present invention. First, as shown in FIG. 2A, in the step of magnetizing three plate-like magnet materials formed in a square shape, NS NS is applied in the lateral direction of each plate-like magnet material.
Three plate magnets 3a, 3b, and 3c are manufactured by applying a magnetic field so that the directions of the poles are shifted by 120 °. For example, in this embodiment, the first sheet magnet 3a is magnetized in a diagonal direction, the second sheet magnet 3b is magnetized in a direction shifted from the diagonal by 120 °, and the third sheet magnet 3c is 2 It is magnetized in a direction further deviated by 120 ° from the first sheet.

Next, as shown in FIG. 4 (b), the three magnetized plate magnets 3a, 3b, 3c are overlapped with each other so that the respective sides of the square are aligned, and bonded with an epoxy adhesive. To produce the laminated magnet 4. At this time, by superimposing the NS poles with the directions shifted by 120 °, the NS poles are vertically shifted by 120 ° from the center point 6 in the vertical direction as shown in the plan perspective view of FIG. Is set by

In the last cutting step, as shown in FIG. 4C, the laminated magnet 4 is cut into a dice pattern by wire discharge or dicer, and the plate magnets 3a, 3b, 3c are laminated in three layers. A multi-pole magnet 5 having the shape of a dice is manufactured. As in the first embodiment, the multipole magnet 5 has N poles and S poles alternately arranged at every rotation angle of 60 ° from the center, thereby forming a multipole magnet 5 having six poles. In the manufacturing method according to this embodiment, similarly to the above-described embodiment, a large amount of the multipole magnets 5 can be manufactured at one time. The number of pieces can be increased.

[0015]

As described above, according to the method of manufacturing a multipolar magnet according to the first aspect of the present invention, the magnetizing process of the plate magnets requires only the magnetization of the NS pole in the same direction. The cost can be suppressed, the positioning of the NS pole during manufacturing becomes easy, and accurate angle setting can be performed. Also, by cutting the superimposed plate magnets in a dice pattern,
There is an effect that a large number of multipole magnets can be manufactured at one time. Further, a multi-pole magnet having an arbitrary number of poles can be manufactured by a simple method that merely increases the number of laminated plate magnets.

Further, according to the method of manufacturing a multi-pole magnet according to the second aspect of the present invention, a plurality of substantially square plate-like magnet materials are attached so that the directions of the respective NS poles are shifted by a predetermined angle. A plurality of magnetized plate magnets are overlapped and glued so that the sides of the rectangle are aligned, and the deviation angle between the N pole and S pole is accurately set by a simple method of aligning the sides of the rectangle. it can.

[Brief description of the drawings]

FIG. 1 is a manufacturing process diagram of a multipolar magnet according to a first embodiment of the present invention.

FIG. 2 is a plan view showing an angular position of an NS pole when plate magnets are superimposed.

FIG. 3 is a plan perspective view of a multipole magnet cut in a dice shape.

FIG. 4 is a manufacturing process diagram of a multipolar magnet according to a second embodiment of the present invention.

FIG. 5 is a plan view showing an angular position of an NS pole when plate magnets are overlapped in the second embodiment.

FIG. 6 is a perspective view showing an example of a conventional multi-pole rotor magnet.

FIG. 7 is a plan view showing an angular position of an NS pole of the rotor multipole magnet shown in FIG. 6;

FIG. 8 is a perspective view showing another example of a conventional multi-pole rotor magnet.

FIG. 9 is a plan view showing the angular positions of NS poles of the rotor multipole magnet shown in FIG. 8;

[Explanation of symbols]

 3a, 3b, 3c Plate magnet 4 Laminated magnet 5 Multi-pole magnet

Claims (2)

[Claims] 1. A step of magnetizing a plurality of substantially square plate-shaped magnet materials with NS poles in a fixed direction on a side surface of each plate-shaped magnet material; A method of manufacturing a multi-pole magnet, comprising: a step of superimposing and adhering to each other while shifting the directions of poles by a predetermined angle; and a step of cutting the superimposed plate magnets in a dice pattern in a direction orthogonal to the direction of superposition. 2. A step of magnetizing a plurality of substantially square plate-like magnet materials by shifting an NS pole in a lateral direction by a predetermined angle, and applying the plurality of magnetized plate magnets to each side of a substantially square shape. And a step of cutting the superposed plate magnets in a dice pattern in a direction orthogonal to the superposition direction so that the NS poles are aligned and the directions of the NS poles are shifted by the predetermined angle. Polar magnet manufacturing method.