JPS5814579Y2 - Magnetizing device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a magnetizing device, and in particular, a jig that holds a material to be magnetized can be freely rotated around an axis perpendicular to the magnetization direction, thereby producing an anisotropic magnet. The present invention relates to a magnetizing device that enables easy and effective magnetization.

Ferrite magnets mainly composed of Ba0.6Fe203 or Sr0.6Fe203 have strong coercive force, are chemically stable, and are inexpensive, so they are currently the mainstream of permanent magnets.

Methods for manufacturing this magnet include a method in which powder of the above material is press-molded and then fired, and a method in which a magnetic field is applied parallel to the pressing direction during press-forming to align the magnetic field and then fired.

Magnets manufactured by the former method are called isotropic magnets because their demagnetization curves are not rectangular and the orientation direction of each particle is not constant.

On the other hand, magnets manufactured by the latter method have rectangular demagnetization curves and each particle is oriented in a predetermined direction, so they are called anisotropic magnets.

FIG. 1 is a diagram showing a state in which a cylindrical magnet is magnetized, and FIG. 1A is a front view including a partial cross section, and FIG. 1B is a plan view.

In the figure, a magnetized material 3 attached to a jig 2 is placed in a magnetic field formed by an electromagnet 1 and is magnetized.

During this magnetization, if the material to be magnetized is an anisotropic magnet, extremely effective magnetization can be achieved if the direction of the magnetic field of the magnetizing device and the direction of grain orientation of the material to be magnetized match. However, if these do not match, the efficiency of magnetization will decrease.

In order to prevent this, when attaching the magnetized material to the jig of the magnetizing device, it is necessary to align the orientation direction of the particles with the direction of the magnetizing magnetic field.

Conventionally, this attachment of the magnetized material has been done manually by checking the marks of the direction of particle orientation that were attached during press molding, but this work is troublesome and may cause misalignment. The disadvantage is that it is easy to
This led to an increase in the cost of magnets.

It is an object of the present invention to improve the drawbacks of the conventional magnetizing devices described above and to provide a magnetizing device that can magnetize an anisotropic magnet extremely efficiently and easily.

The present invention was developed based on the fact that when an anisotropic magnet is placed in a magnetic field, an electromagnetic force acts on the magnet that causes the direction of the magnet's particle orientation to match the direction of the magnetic field. This object is distantly related to the above object by making a jig for holding a magnetized material used in a magnetizing device rotatable around an axis perpendicular to the direction of magnetization.

Embodiments of the present invention will be described below based on the drawings.

FIG. 2 is a diagram showing an example of a jig used in the magnetizing device according to the present invention.

(The figure is slightly enlarged compared to Fig. 1.) In the same figure, a main body 2A of the jig 2 has a shaft 2B for holding the magnetized material, which rotates around the axis XX through a bearing 2C. It is mounted so that it can move freely.

Now attach the cylindrical magnetized material 3 to this shaft 2B and
When placed in the magnetic field formed by the electromagnet 1 as shown in Figure a, the shaft 2B rotates together with the magnetized material 3 until the direction of the magnetic field matches the direction of grain orientation of the magnetized material. Stop.

Therefore, magnetization is performed extremely efficiently.

The above explanation mainly deals with ferrite magnets having a cylindrical shape as the magnetized material, but the present invention can be effectively implemented with magnetic materials other than ferrite magnets, and the shape It is clear that the present invention can also be effectively implemented for shapes other than cylindrical shapes.

The present invention increases the efficiency of magnetization of anisotropic magnets, and therefore has a great effect on reducing the cost of magnets.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a situation in which a cylindrical magnet is magnetized by a magnetizing device, in which a is a front view including a partial cross section, b is a plan view,
FIG. 2 is a diagram showing an example of a jig for a magnetizing device according to the present invention. 1...Electromagnet, 2...Jig, 2A...
...Body, 2B...Shaft, 2C...
Bearing, 3...Magnetized material.

Claims (1)

[Scope of utility model registration request] A magnetizing device that has a jig that holds a magnetized material rotatably around an axis perpendicular to the direction of magnetization.