JPS6294903A - Manufacture of multipolar magnet - Google Patents

Abstract

PURPOSE:To obtain a multipolar magnet of polar orientation magnetization by causing the projected portions of the uneven yoke of a magnetizer which are formed at a same pitch to abut on both opposed surfaces of a molded form made of a magnet material with a half pitch shifted, allowing a magnetic flux to flow to apply a pseudo- polar orientation, and thereafter applying magnetization of alternating polarities to the portion on which the projected portion of either surface wave abutting. CONSTITUTION:When pole pieces 1, 1' are excited, the magnetic flux phi generated by this obliquely crosses a molded form 20 from a projected portion 5A of the outer pole 3 and enters a projected portion 7A of the opposite inner pole 6, and returns to the pole pieces 1, 1'. By this, a pseudo-polar orientation is applied to the molded form 20. Then, the magnetizing poles 11, 12 of a magnetizer is abutted on the position on which the projected portion of either surface of the molded form 20, for instance, the projected portion 5A of the outer surface wave abutting. And, if a current is caused to flow through coils 13, 14 in such directions as to generate magnetic fluxes of N- and S-poles, respectively, the magnetic flux phi flows in the direction from the magnetizing pole 11 to the magnetizing pole 12, performing polar orientation magnetization of only one surface.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a multipolar magnet in which N and S poles are formed close to each other on one surface of a molded body made of magnetic material.

[Conventional technology]

Fig. 3 is an explanatory diagram of a ring-shaped magnet magnetized by a radially oriented magnet, in which the direction of magnetization is the radial direction, such as those formed by molding magnetic powder such as ferrite, samarium-cobalt alloy, etc. ! A magnetic field is alternately applied from the outside to the inside and from the inside to the outside to the molded body 20 made of a magnetic material such as an alloy containing elements of the -, to form N and S poles alternately. It is.

In this case, N and S poles are formed on the inner and outer surfaces of the molded body 20.

FIG. 4(a) is an explanatory diagram of a ring-shaped magnet magnetized as a pole-oriented magnet, and the direction of magnetization is between the IIA contacts on the outer surface. Conversely, it is also possible to magnetize only the inner surface.

That is, rj magnetic poles 31.32 made of soft iron or the like are brought into contact with the outer surface of the molded body 20 at equal intervals, and each magnetized pole 31.3
When a current that generates magnetic flux for N and S poles is passed through the coils 33 and 34 attached to the coils 2, the magnetic flux flows in the direction of the arrow, and magnetization is performed.

[Problem that the invention seeks to solve]

The pole-oriented magnet described in 1-3 was not economically advantageous because it generated the same magnetic field as the magnetizer shown in FIG. 4(b) and required the use of a defective type as an alignment mold.

The present invention was made to solve the problem described in L, and an object of the present invention is to provide a method for manufacturing a multipolar magnet that can perform orientation and magnetization close to polar orientation.

[Means for solving problems]

The method for manufacturing a multipolar magnet according to the present invention includes contacting convex portions of a predetermined pitch formed on a concavo-convex yoke of celadon porcelain with one surface of a molded body made of a magnetic material, and contacting the convex portions with a predetermined pitch on the other surface of the molded body. The convex portions of the concave-convex yoke of the magnetizer, which are formed at the same predetermined pitch as the convex portions, are brought into contact with the convex portions shifted by a half pitch, and the magnetic flux is transferred from the convex portions on one side to the convex portions on the other side via the molded body. is concentrated to orient the molded body, and then magnetized by alternately applying the north and south poles of the magnetization poles to the abutting portions of the convex portions on one surface or the other surface. .

[Effect]

This invention involves shifting the protrusions of the orientation mold by a predetermined pinch on one side and the other side of the molded body, respectively, and causing a magnetic flux to flow from the force protrusion to the other protrusion. By applying polar orientation, and then applying alternating W polarity magnetization to the portion where the convex portions of either surface were in contact, a polar-oriented RI multipolar magnet can be obtained.

〔Example〕

FIGS. 1(a) and 1(b) show an apparatus used in an embodiment of the present invention.

In FIG. 1(a), 1.1' is a pole piece, 2.
2' is a coil, which is attached to the pole pieces 1 and 1'.

Reference numeral 3 denotes an outer pole, which has a cylindrical space 4 at the center and a concave-convex yoke 5 on its inner surface. The concavo-convex yoke 5 has convex portions 5A and four portions 5B made of non-magnetic material that are alternately formed at a predetermined pitch. Reference numeral 6 denotes an inner pole, which has a cylindrical outer shape, and its outer diameter is smaller than the inner diameter of the outer pole 3 by the thickness of the molded body 20.

A concave and convex yoke 7 is formed on the outer periphery of the inner pole 6, and convex portions 7A and four portions 7B are formed on this concave and convex yoke 7 with a predetermined pinch. And the pitch of the convex part 5A and the four parts 5B,
The pitches of the convex portions 7A and the four portions 7B are formed at the same pitch (in this embodiment, since the molded body 2o is not a plate but a ring shape, the pitches are square pitches).

In FIG. 1(b), 11.12 is the n magnetic pole of the magnetizer, and 13.14 is the coil attached to these magnetized poles 11.12.

Now, in Figure D11 (a), if pole piece 1°1' becomes the N pole, the magnetic flux φ generated by this is:
It diagonally crosses the molded body 2o from the convex portion 5A of the outer pole 3, enters the convex portion 7A of the opposing inner pole 6, and returns to the pole piece 1°1' through a magnetic path (not shown).

As a result, the molded body 20 is given a pseudo polar orientation of the magnetic flux as shown in FIG.

Next, either side of the molded body 2o, for example 1 (b
), the magnetizing poles 11 and 12 of the magnetizer are brought into contact with the position where the convex portion 5A of FIG. 1(a) on the outer surface was brought into contact. Then, when current is passed through the coils 13 and 14 in a direction that generates N-pole and S-pole magnetic fluxes, the magnetic flux φ changes to the magnetized pole 11.
The magnetic flux flows in the direction from the magnetic pole toward the magnetized pole 12, and pole-oriented celadon is produced on only one side.

In the embodiment described above, the case of the ring-shaped molded body 20 has been described, but it goes without saying that the molded body 20 may be in the form of a plate, an arc, or any other shape.

〔Effect of the invention〕

As explained above, this invention has the convex portions of the uneven yoke of the alignment mold on both sides of the molded body shifted by 7 pitches in the W direction, and magnetic flux is caused to flow from one convex portion to the other convex portion through the molded body. Then, the molded body was magnetized by applying the north and south poles of the magnetization poles alternately to the part of the molded body that had been in contact with the convex portion on one side of the molded body. Therefore, since the orientation becomes a quasi-polar orientation, there is an advantage that the magnetic flux tank generated from the magnet surface can be taken out more effectively than in a radially oriented magnet.

[Brief explanation of drawings]

FIGS. 1(a) and (b) are schematic diagrams of the apparatus used in the method for manufacturing a multipolar magnet of the present invention, and FIG. 2 shows how to simulate the orientation of a molded body using FIG. 1(a). Figure 3 is a diagram for explaining the conventional radial direction magnetization method.
Figures (a) and (b) are diagrams for explaining a conventional polar orientation magnetization method. In the figure, 1.1' is a pole piece, 2.2' is a coil, and 3
is the outside, 4 is the cylindrical space, 5 is the uneven yoke, 5A is the convex part, 5B is the concave part, 6 is the inner pole, 7 is the uneven yoke, 7A is the convex part, 7B is the fourth part, 11.12 is the magnetized pole, 13 and 14 are coils, and 2o is a molded body. 1st v! J Figure 2 Figure 3 Figure 4 (b)

Claims (1)

[Claims] Convex portions formed at a predetermined pitch formed on a concavo-convex yoke of an orientation mold are brought into contact with one surface of a molded body made of a magnetic material, and convex portions formed at a predetermined pitch identical to the convex portions are brought into contact with the other surface of the molded body. The convex portions of the uneven yoke of the orientation mold are brought into contact with each other by being shifted by half a pitch, and the magnetic flux is preferentially concentrated from the convex portion of the one surface to the convex portion of the other surface via the molded body, and the magnetic flux is directed to the molded body. A method for manufacturing a multipolar magnet, which comprises oriented the magnet, and then magnetizes it by alternately applying the north and south poles of the magnetized poles to the abutting portions of the convex portions of the one surface or the other surface. .