JP3982593B2 - Manufacturing method of multipolar magnet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of manufacturing a magnet magnetized in multiple poles, and more particularly to a method of manufacturing a multipole magnet used in a rotor of a stepping motor used in an electronic timepiece, an electronic computer, and peripheral devices thereof. .
[0002]
[Prior art]
Conventionally, as a multipolar magnet used for the rotor of this type of electronic timepiece motor, for example, as shown in FIG. 6, a plurality of disk magnets 1a, 1b, 1c having NS poles in the radial direction are provided. Some were multipolarized by overlapping (Japanese Patent Laid-Open No. 50-98614). Thus, by superimposing a plurality of disk magnets 1a, 1b, 1c, as shown in the plan view of FIG. 7, a multipolar magnet 2 in which NS poles are alternately arranged is produced. The method of manufacturing the multipolar magnet 2 includes, for example, a step of performing two-pole magnetization in the radial direction on each of the magnet materials formed in the shape of three discs, and NS poles of the three disc magnets 1a, 1b, 1c. Are bonded to each other at a position shifted by 60 ° with respect to the center of the disk, and superposed.
[0003]
Further, as shown in FIGS . 8 and 9 , as a conventional multipolar magnet 2, an anisotropic magnet material is used as a magnet material, and N poles and S poles are alternately attached to the disk in the radial direction. There was also a multipole magnet 2 made by a magnetizing method.
[0004]
[Problems to be solved by the invention]
However, in this type of multipolar magnet 2, it is desirable that the magnetic pole shift angle with respect to the center of the disk, for example, N and S in the case of FIG. In the conventional manufacturing method of the multipolar magnet 2 as described above, since the three disc magnets 1a, 1b, and 1c are used, the magnetic pole shift angle is set with respect to the center of the disc when bonded. It was difficult to perform accurately. In addition, the disk magnets 1a, 1b, and 1c are overlapped and bonded to each one of the multipolar magnets 2 to increase the number of steps and increase the cost.
[0005]
Further, in the method of manufacturing the multipolar magnet 2 as shown in FIGS . 8 and 9 , since the number of times of magnetization increases as the number of magnetic poles increases, the manufacturing cost is increased and the magnet material is used. Only anisotropic magnet materials could be used, and isotropic magnet materials could not be used.
[0006]
Therefore, the present invention can accurately set the angle of the NS pole with respect to the rotation center of the multipolar magnet, and can be manufactured using any of an isotropic magnet material and an anisotropic magnet material as a magnet material, Furthermore, the present invention provides a method for producing a multipolar magnet that can reduce the cost by simplifying the production process.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, a method for producing a multipolar magnet according to the present invention includes a step of magnetizing NS poles in a diagonal direction of each plate magnet material with respect to a plurality of substantially square plate magnet materials, A step of superimposing the plurality of magnetized plate magnets while adhering NS poles to each other by a predetermined angle and bonding them to each other, and a step of cutting the superposed plate magnets into a grid shape in a direction perpendicular to the superposition direction It is characterized by comprising.
[0008]
The method for producing a multipolar magnet of the present invention includes a step of magnetizing NS poles in a diagonal direction of the first plate-shaped magnet material with respect to a plurality of substantially square plate-shaped magnet materials ; The step of magnetizing the NS poles of the subsequent plate magnet materials by shifting the NS poles by a predetermined angle with respect to the diagonal direction, the NS of the magnetized plate magnets so that the sides of the substantially square are aligned, and NS The method includes the steps of overlapping and adhering each other in a state in which the directions of the poles are shifted by the predetermined angle, and a step of cutting the overlapped plate magnets in a grid shape in a direction orthogonal to the overlapping direction.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, based on an accompanying drawing, the manufacturing method of the multipole magnet concerning the present invention is explained in detail. FIG. 1 shows a first embodiment of a manufacturing method according to the present invention. First, as shown in FIG. 1 (a), in the step of magnetizing three plate-shaped magnet materials formed in a square of the same size, a magnetic field is applied in the diagonal direction of each plate-shaped magnet material to face each other. Three plate magnets 3a, 3b, 3c having NS poles magnetized at the corners to be manufactured are manufactured. Since the NS pole is magnetized in only one direction, a samarium / cobalt anisotropic magnet material, neodymium / iron / boron magnet can be used as the magnet material, even if an isotropic magnet material of platinum / cobalt is used. Any material may be used. Moreover, the manufacturing method of a 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.
[0010]
Next, as shown in FIGS. 1B and 2, the magnetized three plate magnets 3 a, 3 b, 3 c are arranged with each N pole, The laminated magnets 4 are manufactured by superposing the S poles so as to be shifted from each other by 120 ° and bonding them with an epoxy adhesive. In this case, since the square corners can be used for positioning, the direction of the NS pole can be accurately shifted by 120 ° and bonded.
[0011]
Finally, as shown in FIG. 1C, the stacked laminated magnets 4 are cut into a grid shape by wire discharge or a dicer. By cutting the plate magnets 3a, 3b, 3c in a stacked state, the multi-pole magnet 5 having a lattice shape in which the plate magnets 3a, 3b, 3c are laminated in three layers is completed. FIG. 3 shows a plan perspective view of the multipolar magnet 5 cut into a lattice shape. Even if the magnets are cut in a square shape, each has NS poles again, so the multi-pole magnet 5 stacked in three layers alternates between N poles and S poles every 60 ° rotation angle from the square center point 7. As a result, the multipolar magnet 5 having 6 poles is obtained. Thus, the multipolar magnet 5 can be manufactured in large quantities at a time by cutting it into the shape of a ridge. In addition, although cut into a square shape in this embodiment, a circular multipolar magnet for a rotor similar to the conventional one can be made by cutting into a disk shape. In the present embodiment, the three plate magnets 3a, 3b, 3c are laminated to form the multipolar magnet 5, but a multipolar magnet having an arbitrary number of poles can be formed by laminating according to the required number of poles. Can be manufactured.
[0012]
FIG. 4 shows a second embodiment of the manufacturing method according to the present invention. First, as shown in FIG. 4 (a), in the step of magnetizing the three plate-shaped magnetic material formed into a square, the side surface direction of the respective plate-shaped magnet material is the direction of NS poles shifted by 120 ° Thus, three plate magnets 3a, 3b, 3c magnetized by applying a magnetic field are manufactured. For example, in this embodiment, the first plate magnet 3a is magnetized in a diagonal direction, the second plate magnet 3b is magnetized in a direction shifted by 120 ° from the diagonal, and the third plate magnet 3c is 2 It is magnetized in a direction further shifted by 120 ° from the first sheet.
[0013]
Next, as shown in FIG. 4 (b), the magnetized three plate magnets 3a, 3b, 3c are laminated with an epoxy adhesive so that the square sides are aligned and laminated magnets. 4 is produced. At this time, by superimposing the NS poles in a state shifted by 120 °, the NS poles are shifted by 120 ° from the center point 6 in the vertical direction as shown in the plan perspective view of FIG. Set by.
[0014]
In the last cutting step, as shown in FIG. 4 (c), the laminated magnet 4 is cut into a grid shape by wire discharge or a dicer or the like, and the plate magnets 3a, 3b, 3c are stacked in 3 layers. The multipolar magnet 5 is manufactured. As in the first embodiment, this multipolar magnet 5 has N poles and S poles alternately arranged at every rotation angle of 60 ° from the center, and as a result, constitutes a 6 pole multipolar magnet 5. Also in the manufacturing method in this embodiment, a large number of multipolar magnets 5 can be manufactured at one time as in the case of the above embodiment, and particularly when the laminated magnet 4 is cut, there is no waste. The number of picks can be increased.
[0015]
【The invention's effect】
As described above, according to the method for manufacturing a multi-pole magnet according to claim 1 of the present invention, NS magnets can be magnetized in the same direction in the plate magnet magnetization process, so that the manufacturing cost can be reduced. In addition, positioning of the NS pole during manufacture is facilitated, and an accurate angle can be set. Further, there is an effect that a large number of multi-pole magnets can be manufactured at a time by cutting the stacked plate magnets into a lattice shape. Furthermore, a multipolar magnet having an arbitrary number of poles can be manufactured by a simple method that increases the number of laminated plate magnets.
[0016]
Further, according to the method of manufacturing a multipolar magnet according to claim 2 of the present invention, a plurality of substantially square plate-shaped magnet materials are magnetized so that the direction of each NS pole is shifted by a predetermined angle, Since a plurality of magnetized plate magnets are superposed and bonded so that the sides of the substantially square are aligned, the deviation angle between the N pole and the S pole can be accurately set by a simple method of aligning the sides of the square.
[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 superposed.
FIG. 3 is a plan perspective view of a multipolar magnet cut into a grid 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 superposed in the second embodiment.
FIG. 6 is a perspective view showing an example of a conventional multipolar magnet for a rotor.
7 is a plan view showing angular positions of NS poles of the rotor multipole magnet shown in FIG. 6; FIG.
FIG. 8 is a perspective view showing another example of a conventional rotor multipolar magnet.
9 is a plan view showing angular positions of NS poles of the rotor multipole magnet shown in FIG. 8. FIG.
[Explanation of symbols]
3a, 3b, 3c Plate magnet 4 Laminated magnet 5 Multipolar magnet

Claims (5)

A step of magnetizing NS poles in a diagonal direction of each plate-shaped magnet material with respect to a plurality of substantially square plate-shaped magnet materials, and a plurality of the magnetized plate magnets in a NS direction. A method for producing a multipolar magnet, comprising: a step of overlapping and adhering to each other while shifting; and a step of cutting the overlapped plate magnets in a shape of a scissors in a direction orthogonal to the overlapping direction. A process of magnetizing NS poles in a diagonal direction of the first plate-shaped magnet material with respect to a plurality of substantially square plate-shaped magnet materials, and NS poles of the second and subsequent plate-shaped magnet materials as the diagonal lines. The step of magnetizing by shifting a predetermined angle with respect to the direction, and the magnetized plate magnets are overlapped so that the sides of the substantially square shape are aligned and the direction of the NS pole is shifted by the predetermined angle. A method for producing a multipolar magnet, comprising: a step of combining and adhering to each other; and a step of cutting the superposed plate magnets in a grid shape in a direction orthogonal to the superposition direction. A process of magnetizing NS poles in a diagonal direction of each plate magnet material with respect to a plurality of substantially square plate magnet materials, and the magnetized plate magnets with a NS pole direction of 360 degrees A multipolar magnet comprising: a step of overlapping and adhering each other while shifting each other by an angle equally divided by the number of plate magnets; and a step of cutting the overlapped plate magnets into a grid shape in a direction perpendicular to the overlapping direction. Production method. A process of magnetizing NS poles in a diagonal direction of the first plate-shaped magnet material with respect to a plurality of substantially square plate-shaped magnet materials, and NS poles of the second and subsequent plate-shaped magnet materials as the diagonal lines. The step of magnetizing by shifting the angle equally divided by the number of plate magnets with respect to 360 degrees with respect to the direction, and the NS of the plurality of magnetized plate magnets so that the sides of the substantially square are aligned and NS A method of manufacturing a multipolar magnet, comprising: a step of overlapping and adhering each other in a state in which the directions of the poles are shifted by the predetermined angle; and a step of cutting the overlapped plate magnets in a shape of scissors in a direction orthogonal to the overlapping direction. A step of magnetizing NS poles in the diagonal direction of each plate magnet material with respect to three substantially square plate magnet materials, and the angle of the NS pole direction of the magnetized plate magnets is 120. A method for producing a multipolar magnet, comprising: a step of overlapping and adhering to each other while shifting each other, and a step of cutting the overlapped plate magnets in a shape of scissors in a direction perpendicular to the overlapping direction.

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