JP2002369426A - Permanent magnet for small synchronous generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the 'maximum energy product' and 'residual magnetic flux density' of an excitation permanent magnet, as much as possible. SOLUTION: A plurality of excitation permanent magnets, formed into a flat tip shape, are used for utilization of magnetic substances with high performance. By storing them in a polygonal magnetic case after polarization, the excitation permanent magnets with high magnetism can be produced. A synchronous generator of high efficiency and high performance can then be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the use of a strong excitation permanent magnet having "maximum energy product" and "residual magnetic flux density" in a small synchronous generator.

[0002]

2. Description of the Related Art Most of permanent magnets for excitation in a small synchronous generator at present use an annular permanent magnet (1) shown in FIG. 2 provided with a necessary interval according to an armature shape. Generally, power is generated by housing the porcelain case (3) concentric with the armature and rotating the porcelain case itself at a high speed.

However, in this method, in most cases, the permanent magnet is an annular single piece, and a permanent magnet molded by a method such as sintering or injection molding is inserted into a porcelain case, or the number of poles required before insertion is set to N poles. Permanent magnets for excitation are produced by magnetizing the inner circumference, so-called magnetization, alternately with the S pole.

In this case, since only one molded non-magnetized magnetic body is inserted into the porcelain case and the number of poles required for magnetizing the inner circumference is applied at once, there is an advantage that the manufacturing cost can be reduced and the manufacturing cost can be reduced. They are often thought of as permanent magnets for synchronous generators. However, it should be noted that the magnetic material manufactured by this method simply cannot be manufactured simply because it can be easily manufactured.

In some cases, a magnetic material (2) in which a single annular shape is divided into several parts as shown in FIG. 2 is also used. In this case, the magnetic materials also have a common point in magnetization.
Since the N pole and the S pole must be alternately magnetized next to each other, the magnetic flux must be attenuated between the poles. This limits the overall magnetic flux itself.

Further, since the permanent magnet in the synchronous generator is intended for excitation and requires a gap between the poles, the residual magnetic flux density is usually maximized at the center of each pole, ie, N
When the residual magnetic flux density of the pole S pole is displayed in a graph on a plane, FIG.
As shown in (1), it is common to magnetize a magnetic flux that draws a sine wave that becomes “0” between poles at the center of each pole. Therefore, no matter what kind of magnetic material is used, it is currently unavoidable that the “maximum energy product”, “residual magnetic flux density” and the like are limited.

[0007] As a remedy, the jig for magnetizing the magnetic body is improved, and the control of the magnetizing current is improved. However, the magnetic body has a limit in its natural characteristics, and it is dramatically improved. At present, it has not been achieved.

[0008]

The problem to be solved is that the power generation voltage is the product of the rotational speed and the magnetic flux in the synchronous generator, so that the magnitude of the magnetic flux can of course be an essential condition. Therefore, a permanent magnet having a high residual magnetic flux density within a limited volume is required.

[0009]

SUMMARY OF THE INVENTION The present invention relates to a magnetic recording medium which has extremely high "maximum energy product" and "residual magnetic flux density" among existing magnetic materials.
Neodymium (Nd), iron (Fe),
Nd2Fe14 having a tetragonal structure with boron (B) as the main component
A flat chip-shaped magnet (5) shown in FIG.
By using the required number of magnets, the conventional permanent magnet for exciting the synchronous generator is remarkably strengthened and the volume ratio is remarkably reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to reduce the manufacturing cost, it is basically necessary to maintain the conventional configuration. A flat chip-shaped magnet (5) should be made polygonal so as to be in close contact with a porcelain case. Magnet insertion frame for easy insertion
(6) is required. However, the number of poles must be even.

Further, since this magnet is a flat chip-shaped magnet (5), it can be simply magnetized on both sides and can be magnetized uniformly under the best conditions of the magnetic material. A magnet with a stable magnetic force with no quality difference can be obtained.

[0012]

FIG. 2 is a set diagram showing a conventional component configuration showing a comparison with the present invention, wherein (1) to (3) are the component names.

FIG. 3 is an assembly diagram showing the component configuration of the present invention.
(4) to (7) are the names of the respective components. After the plate-shaped magnet (5) is magnetized, the N-pole and S-pole are alternately arranged on the magnet insertion frame (6) by changing the surface, Polygon porcelain case
It is configured by storing it in (7).

FIG. 4 is an assembling perspective view of the present invention. The portion indicated by (8) is a minimum gap which is naturally formed because of the cylindrical armature (4) and the flat chip-shaped magnet (5). Yes, (9) is the maximum interval. This type of synchronous generator
Since the armature (4) and the porcelain case are generally concentric and a permanent magnet for excitation rotates, the polygonal porcelain case (7)
If the polygonal porcelain case (7) with the flat chip-shaped magnet (5) mounted on it is rotated so that the magnets are alternately mounted with N and S poles, the armature (4) and the magnet When the magnetic force is at the shortest interval, the magnetic force repeats to be maximum, and conversely, becomes weak at the maximum interval, which is farthest away.
A magnetic force distribution that draws a pseudo sine wave similar to the graph of FIG. Therefore, the polygonal porcelain case (7) is an essential element of the present invention.

[0015]

As described above, the synchronous generator exciting permanent magnet of the present invention is obtained by simply magnetizing a flat chip-shaped magnetic material by double-sided magnetization, and incorporating the required number in a ring shape into a polygonal porcelain case. It is a simple method of storing in
Each magnet is magnetized in the shape of a flat chip at the maximum, and it uses a plurality of magnets. Therefore, compared to conventional ferrite sintered magnets, the "maximum energy product" is about 10 times, and the "residual magnetic flux density"
, Which is about three times as good as that, it is possible to obtain high-efficiency and high-performance power generation, which can be used in existing home wind power generators, mobile phone charging generators, etc. become.

[Brief description of the drawings]

FIG. 1 is a graph showing the magnetic flux density of an exciting permanent magnet for a synchronous generator.

FIG. 2 is a configuration diagram of a conventional excitation permanent magnet for a synchronous generator.

FIG. 3 is a structural view of parts of an exciting permanent magnet for a synchronous generator according to the present invention.

FIG. 4 is an assembled perspective view of the synchronous generator of the present invention.

[Explanation of symbols]

 (1) Annular permanent magnet (2) Divided molded magnetic material (3) Porcelain case (4) Armature (5) Flat chip shaped magnet (6) Magnet insertion frame (7) Polygonal porcelain case (8 ) Minimum gap between armature and flat chip magnet (9) Maximum gap between armature and flat chip magnet

Claims (1)

[Claims] 1. A small synchronous generator exciting permanent magnet formed in an annular shape by alternately arranging N poles and S poles of a single pole with respect to an exciting permanent magnet for an armature coil of the small synchronous generator. The magnet is a simple flat chip shape permanent magnet for excitation of a small synchronous generator, the porcelain case is polygonal for the number of flat chip shape magnets used, and the flat chip is Excitation permanent magnets for small synchronous generators with a magnet insertion frame to easily set shaped magnets.