JP2002142415A - Magnetization device and magnetization method of permanent magnet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetization device and a magnetization method which can magnetize a permanent magnet so as to have a plurality of poles with very narrow pole pitches while the winding structure of the device is simple. SOLUTION: This magnetization device of a permanent magnet has a magnetizing yoke made of magnetic material and windings wound on the magnetizing yoke. The permanent magnet is held between pole teeth belonging to a first stage and pole teeth belonging to a second stage and magnetized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetizing apparatus and a magnetizing method for a permanent magnet, and more particularly to a magnetizing apparatus and a magnetizing method for a permanent magnet realizing a multi-pole structure in which N poles and S poles appear alternately. .

[0002]

2. Description of the Related Art The simplest method for obtaining a multi-pole structure using permanent magnets is to arrange a plurality of magnetized small pieces of permanent magnets so that their magnetization directions are alternated. However, this method tends to cause variations in the magnetic pole pitch due to manufacturing errors, and the productivity is poor due to the electromagnetic force acting between the permanent magnets. Therefore, conventionally, a large number of methods for collectively magnetizing a plurality of magnetic pole structures have been proposed.
3630.

[0003]

However, the conventional batch magnetization method has the following problems. That is,
In the conventional magnetizing device as shown in FIG. 11, the space between the magnetic poles for installing the windings is required, so that the magnetic pole pitch cannot be reduced much, and the wire diameter and the number of turns of the windings are also limited by the space. Was. In addition, since the winding is installed near the permanent magnet, the influence of the movement of the winding by the electromagnetic force or the flow of the eddy current through the winding tends to appear in the magnetization distribution.

An object of the present invention is to provide a magnetizing apparatus and a magnetizing method which can magnetize a permanent magnet in a plural magnetic pole structure at a very narrow magnetic pole pitch while having a simple winding structure.

[0005]

One feature of a permanent magnet magnetizing apparatus according to the present invention is that a permanent magnet having a magnetized yoke formed of a magnetic material and a winding wound around the magnetized yoke. In the magnetizing device, the magnetized yoke is arranged in a first stage and a second stage in a direction substantially perpendicular to the direction in which the magnetic poles are arranged. A first row of second magnetic pole teeth arranged in a substantially vertical direction divided into a first row and a second row, and the first magnetic pole teeth of the one magnetic pole row and the first magnetic pole teeth of the other row; The magnetic pole teeth of the step are alternately arranged along the direction in which the magnetic poles are arranged. Similarly, the second magnetic pole tooth of the one magnetic pole tooth row and the second magnetic pole tooth of the other magnetic pole tooth row are similarly arranged. The magnetic poles are alternately arranged along the direction in which the magnetic poles are arranged. At this time, one and the other magnetic pole tooth rows of the magnetization yoke may be arranged along an arbitrary curve.

[0006] The method of magnetizing a permanent magnet according to the present invention comprises:
The magnetic pole teeth belonging to the first stage of the magnetized yoke and the second
The permanent magnet is held between the magnetic pole teeth belonging to the step and magnetized. Alternatively, the permanent magnet is sandwiched between the one magnetic pole tooth row and the other magnetic pole tooth row and magnetized.

[0007] By using a permanent magnet magnetized by the magnetizing device or the magnetizing method as a part, a motor, a generator, or a magnet coupling can be manufactured. Alternatively, an electric motor, a generator, or a magnet coupling can be manufactured by using the magnetized yoke of the magnetizing device as a stator core or a mover core.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a permanent magnet magnetizing device according to one embodiment of the present invention (referred to as Example 1). The magnetizing device includes a magnetized yoke 11 made of a magnetic material and a winding 12 wound around one portion of the magnetized yoke in an annular shape. Generally, iron is used as the magnetic material forming the magnetized yoke 11, but other materials may be used. The magnetizing yoke 11 has one magnetic pole tooth row 13 arranged in a first stage and a second stage in a direction substantially perpendicular to the direction in which the magnetic poles are arranged, and a direction substantially perpendicular to the direction in which the magnetic poles are arranged. And a second row of magnetic pole teeth 14 arranged in a first row and a second row, and the first row of magnetic pole teeth 13 of the one row of magnetic pole teeth.
a and the first-stage magnetic pole teeth 14a of the other magnetic pole tooth row are alternately arranged along the direction in which the magnetic poles are arranged, and similarly, the second-stage magnetic pole teeth 13b of the one magnetic pole tooth row and the other And the second-stage magnetic pole teeth 14b of the magnetic pole tooth row are alternately arranged along the direction in which the magnetic poles are arranged. Thereby, the magnetic pole teeth 13a and 14a belonging to the first stage and the magnetic pole teeth 13b belonging to the second stage
And 14b, a region in which a magnetic field is generated in a direction from the first-stage magnetic pole teeth to the second-stage magnetic pole teeth by passing a current through the winding 12, and a second-stage magnetic pole First from teeth
The regions where the magnetic field is generated are alternately arranged in the direction toward the magnetic pole teeth of the step. The permanent magnet 21 is sandwiched in the space, and is magnetized into a multi-pole structure by the magnetic field. The magnetized permanent magnet 21 is spontaneously ejected when a next permanent magnet is inserted.

FIG. 2 is a conceptual view showing the magnetized yoke 11 partially. The arrow indicates the approximate direction of the magnetic field generated when the current flows through the winding 12 in the direction shown in the figure (the mark x indicates the direction toward the back of the paper, and the black circle indicates the direction toward the paper). .

The permanent magnet 21 to be magnetized here may be formed integrally, or as shown in FIG. 3, a plurality of non-magnetized permanent magnet pieces 22 may be connected by a support member 23.

An opening may be provided in the magnetized yoke 11 as shown in FIG. 4 so that the permanent magnet 21 can be inserted through the opening as shown in FIG.

FIG. 5 shows another embodiment (Example 2) of the present invention.
) Is shown. The magnetizing device of the present embodiment includes a magnetizing yoke 11 made of a magnetic material and a winding 12 wound around one portion of the magnetizing yoke. Generally, iron is used as the magnetic material forming the magnetized yoke 11, but other materials may be used.
The magnetizing yoke 11 has one magnetic pole tooth row 13 arranged in a first stage and a second stage in a direction substantially perpendicular to the direction in which the magnetic poles are arranged, and a direction substantially perpendicular to the direction in which the magnetic poles are arranged. The other row of magnetic pole teeth 14 arranged in a first stage and a second stage
The first-stage magnetic pole teeth 13a of the one magnetic pole tooth row and the first-stage magnetic pole teeth 14a of the other magnetic pole tooth row are alternately arranged along the direction in which the magnetic poles are arranged. The second stage magnetic pole teeth 13b of the one magnetic pole tooth row and the second magnetic pole teeth row 13
The magnetic pole teeth 14b of the step are alternately arranged along the direction in which the magnetic poles are arranged. Thereby, the magnetic pole teeth 13a and 14a belonging to the first stage and the magnetic pole teeth 13b and 1b belonging to the second stage
4b, a region in which a magnetic field is generated in a direction from the first-stage magnetic pole tooth toward the second-stage magnetic pole tooth by passing an electric current through the winding 12, and a second-stage magnetic pole tooth And the regions where the magnetic field is generated are arranged alternately in the direction from the first to the first stage magnetic pole teeth. The permanent magnet 21 is sandwiched in the space, and is magnetized into a multi-pole structure by the magnetic field. The difference from the first embodiment is
The magnetizing yoke 11 has an opening having a width sufficient to insert the permanent magnet 21 in a direction substantially perpendicular to the direction in which the magnetic poles are arranged. Therefore, insertion of the permanent magnet 21
The injection may be performed in the direction in which the magnetic poles are arranged or in the direction of the opening.

FIG. 6 is a conceptual view showing the magnetized yoke 11 partially. The arrow indicates the approximate direction of the magnetic field generated when the current flows through the winding 12 in the direction shown in the figure (the mark x indicates the direction toward the back of the paper, and the black circle indicates the direction toward the paper). .

The permanent magnet 21 to be magnetized here may be formed integrally, or as shown in FIG. 3, may be a plurality of non-magnetized permanent magnet pieces 22 connected by a support member 23.

Alternatively, as shown in FIG. 7, by arranging one and the other magnetic pole tooth rows of the magnetized yoke 11 along an arbitrary curve, it is possible to magnetize a permanent magnet of that shape. Although the curve is open in FIG. 7, it may be a closed curve. For example, when magnetic pole teeth are arranged along a circle, FIG.
The ring-shaped permanent magnet magnetizing device shown in FIG. In FIG. 8, the number of magnetic poles is 16, but another number of magnetic poles may be used. The end of the winding 12 can be easily pulled out from the gap of the magnetized yoke 11 to the outside.

Alternatively, by arranging one and the other teeth of the magnetized yoke 11 as shown in FIGS. 9 and 10, it is also possible to magnetize a disk-shaped permanent magnet.

The permanent magnet 21 magnetized in the first and second embodiments can be used as a component of a motor, a generator, or a magnet coupling. Alternatively, it may be used for other permanent magnet application devices.

Further, by using the magnetized yoke 11 as a stator core or a mover core, a motor, a generator or a magnet coupling can be manufactured. In that case, the magnetizing may be performed after the whole is assembled. Alternatively, the magnetized yoke 11 may be used for other permanent magnet application devices.

[0019]

As described above, the permanent magnet magnetizing apparatus according to the present invention has a simple winding structure, so that it can be easily wound, and the wire diameter and the number of turns can be easily increased.
Further, since no winding is provided between the magnetic poles, the magnetic pole pitch can be reduced. Further, since the winding is separated from the permanent magnet, the magnetization distribution is less affected by the movement of the winding due to the electromagnetic force or the flow of eddy current through the winding.

[Brief description of the drawings]

FIG. 1 is a basic configuration diagram of a magnetizing device according to a first embodiment of the present invention.

FIG. 2 is a conceptual diagram partially showing a magnetized yoke in the magnetized device according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram of a permanent magnet to be magnetized in the first and second embodiments of the present invention.

FIG. 4 is a conceptual diagram partially showing a magnetized yoke in a magnetized device according to a modification of the first embodiment of the present invention.

FIG. 5 is a basic configuration diagram of a magnetizing device according to a second embodiment of the present invention.

FIG. 6 is a conceptual diagram partially showing a magnetized yoke in the magnetized device according to the second embodiment of the present invention.

FIG. 7 is a basic configuration diagram of a magnetizing device according to a first modification of the second embodiment of the present invention.

FIG. 8 is a plan view of a magnetizing device according to a first modification of the second embodiment of the present invention.

FIG. 9 is a basic configuration diagram of a magnetizing device according to a second modification of the second embodiment of the present invention.

FIG. 10 is a basic configuration diagram of a magnetizing device according to a third modification of the second embodiment of the present invention.

FIG. 11 is a plan view of a conventional magnetizing device.

[Explanation of symbols]

11: magnetized yoke, 12: winding, 13, 14: magnetic pole tooth row, 21, 22: permanent magnet, 23: support member, C11,
C21, etc .: winding, SG11, SG12, etc .: permanent magnet segment, P11, P21, etc .: magnetic pole, 40: permanent magnet.

Continuation of the front page (72) Inventor Kenji Miyata 7-1-1, Omika-cho, Hitachi City, Ibaraki Prefecture F-term in Hitachi Research Laboratory, Hitachi Ltd. 5H622 CA02 CA05 CA10 CB03 QB09 QB10 5H641 BB06 BB18 BB19 GG02 GG03 GG04 GG06 GG12 HH02 HH03 HH07 HH10 HH16

Claims (7)

[Claims] 1. A permanent magnet magnetizing device comprising a magnetized yoke formed of a magnetic material and a winding wound on the magnetized yoke,
The magnetizing yoke has one magnetic pole tooth row arranged in a first stage and a second stage in a direction substantially perpendicular to the direction in which the magnetic poles are arranged;
Similarly, it has another magnetic pole tooth row arranged in a first stage and a second row in a direction substantially perpendicular to the direction in which the magnetic poles are arranged, and the first stage magnetic pole tooth of the one magnetic pole tooth row and the The first-stage magnetic pole teeth of the other magnetic pole tooth row are alternately arranged along the direction in which the magnetic poles are arranged, and similarly, the second-stage magnetic pole teeth of the one magnetic pole tooth row and the other magnetic pole teeth row are arranged. A permanent magnet magnetizing device, wherein second stage magnetic pole teeth are alternately arranged along a direction in which the magnetic poles are arranged. 2. The permanent magnet magnetizing device according to claim 1, wherein one and the other magnetic pole tooth rows of the magnetizing yoke are arranged along an arbitrary curve. 3. The permanent magnet magnetizing device according to claim 1, wherein a permanent magnet is held between the magnetic pole teeth belonging to the first stage and the magnetic pole teeth belonging to the second stage. A method for magnetizing a permanent magnet, comprising: 4. The permanent magnet magnetizing device according to claim 1, wherein a permanent magnet is sandwiched between said one magnetic pole tooth row and said other magnetic pole tooth row and magnetized. Method of magnetizing permanent magnets. 5. A permanent magnet magnetized by using the permanent magnet magnetizing device according to claim 1 or 2, or a magnetizing method according to claim 3 or 4. 6. An electric motor, a generator or a magnet coupling, wherein the permanent magnet according to claim 5 is used as a part. 7. An electric motor, a generator or a magnetic coupling, wherein the magnetized yoke in the permanent magnet magnetizing device according to claim 1 or 2 is used as a stator core or a mover core.