JPH03125411A - Magnetizer - Google Patents

Abstract

PURPOSE:To obtain a magnetizer capable of surely magnetizing a target of high coercive force with high flux density by impressing magnetizing fluxes guided by a superconductive guide onto the surface of a restrictor magnetization target in the constriction. CONSTITUTION:When a magnetizing flux 100 is generated by conducting excitation of a magnetizing coil 34, this flux penetrates through the cylinder of a superconductive guide 30. At this time, the superconductive guide 30 prevents the external leakage of the flux 100 by Meissner effect that is one of its superconduction phenomena. Thus, the generated magnetizing flux 100 is guided toward the other end opening 30b. Further, the magnetizing flux 100 guided by the superconductive guide 30 is restricted by the constriction 30a on the opening 30b to obtain a high flux density and is impressed onto the surface of a rare-earth magnet 12. Therefore, the rare-earth magnet 12 of high coercive force can surely be magnetized with high flux density.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetizing device, and particularly to a magnetizing device that magnetizes a magnetized body with high magnetic flux density.

[Prior Art] Today, as magnetic materials used in magnets, rare earths and the like, which require a large coercive force for magnetization, are often used. In particular, magnets made of rare earth materials are often found on the stator side of rotating machines such as motors and generators.

However, in order to magnetize such rare earth metals, it is necessary to
A uniform high magnetic flux density with a high magnetomotive force on the order of 45 km/hr is required.

For this reason, there was a problem in that conventional magnetizing devices could not satisfactorily fully magnetize the magnet (magnetization rate of 100%).

FIG. 3 shows an example of a conventional magnetizing device, in which a motor M is installed inside an air-core coil 10 wound with a plurality of turns, and a stator made of rare earth metal or the like is mounted. It is configured to magnetize the side magnets 12.12.

[Problems to be Solved by the Invention] ■ However, in this conventional device, only a part of the generated magnetic flux 100 interlinks with the magnet 12.1.2. For this reason, there has been a problem in that it is difficult to obtain a uniform high magnetic flux density necessary to reliably magnetize rare earth elements.

■ Also, in rotating electric machines such as motors, the stator side magnet 1.
2.12 is formed in an arc shape.

However, in the conventional device, only a parallel magnetic field 100 can be applied to each magnet 12, 1.2, and the magnetic flux cannot be directed in the radial direction of the arc-shaped magnet 12. Therefore, each magnet 12.12 is magnetized only in a non-uniform pattern with a peak in the center as shown in FIG. There was a problem in that it was difficult to magnetize (magnetization rate 100%).

In particular, in the segment type rare earth isotropic magnet 12,
In order to bring the magnetization pattern closer to the ideal pattern shown in FIG. 4(B), a magnet 12 formed by bonding a plurality of segments is used, or the magnetization of the magnet 12 is weakened. This is the current situation, and effective countermeasures have been desired.

The present invention was made in view of such conventional problems, and its purpose is to provide a magnetizing device that can reliably magnetize a magnetized object with a large coercive force at a high magnetic flux density. .

Furthermore, another object of the present invention is to provide a magnetizing device that can fully magnetize a magnetized body with a good magnetization pattern even if the body has an arc shape with a predetermined curvature. There is a particular thing.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes: a magnetizing coil that generates a magnetic flux for magnetization; and one end of the magnetizing coil is positioned on the open side, and the magnetic flux for magnetization is A superconducting guide section formed in a cylindrical shape so as to pass through the inside thereof, and a constriction section provided at the other end opening side of the superconducting guide section, and a magnetizing magnetic flux guided by the superconducting guide section. The object to be magnetized is uniformly magnetized at a high magnetic flux density by narrowing down and applying the magnetic flux to the surface of the object to be magnetized by the narrowing section.

[Function] In the present invention, a magnetizing coil is provided on one end opening side of a superconducting guide portion formed on the side, and a magnetized body is positioned on the other end opening side of this guide portion.

Then, when the magnetizing coil is energized and excited to generate a magnetizing magnetic flux, this magnetic flux passes through the inside of the cylindrical body of the superconducting guide section.

At this time, the superconducting guide portion prevents leakage of magnetic flux to the outside due to the Meissner effect, which is one of the superconducting phenomena. Therefore, the generated magnetizing magnetic flux is directly guided to the other end opening side.

Furthermore, the magnetizing magnetic flux guided by the superconducting guide section is narrowed down by the narrowing section on the other end opening side, and is applied to the surface of the magnetized body at a high magnetic flux density.

Therefore, according to the present invention, even if the magnetized body is formed using a rare earth material having a large coercive force, it can be reliably magnetized with a high magnetic flux density.

Further, according to the present invention as set forth in claim (2), even when the magnetized body has an arc shape like a stator-side magnet of a rotating electric machine, the magnetic flux is linked perpendicularly to the surface of the magnetized body. It is possible to fully magnetize this in an almost ideal pattern.

[Embodiment] Next, a preferred embodiment of the present invention will be described in detail, taking as an example a case where a stator-side magnet of a motor is magnetized.

FIG. 1 shows a preferred example of the magnetizing device according to the present invention, and the magnetizing device of the embodiment magnetizes a rare earth magnet 12 provided on the stator side of the part It is formed.

This magnetizing device has a superconducting guide section 30 formed in a cylindrical shape.
An iron core 32 is fixedly attached to the opening side of one end of the guide part 30 so as to be in close contact with the inner circumferential surface of the guide part 30, and this iron core 32
The magnetizing coil 34 is tightly wound around the outer periphery of the magnetizing coil 34.

The magnetizing coil 34 has its ampere-turns set so as to generate a large magnetic flux 100 for magnetization.

The superconducting guide portion 30 is formed so that its periphery is cooled by a coolant 36 such as liquefied nitrogen to maintain a good superconducting state.

Further, the other end opening 3 Q b (1
111 is formed with a narrowing part 30a that narrows down the magnetic flux ]00 to a high magnetic flux density.

With the above configuration, when the magnetizing coil 34 is energized and excited to generate a magnetizing magnetic flux 100, this magnetic flux 100 passes through the inside of the cylindrical body of the superconducting guide section 30.

At this time, the superconducting guide section 30 allows magnetic flux 1- to the outside due to the Meissner effect, which is one of the superconducting phenomena.
Prevent leakage of 00. Therefore, the generated magnetizing magnetic flux 100 is directly guided to the other end opening 30b side.

Moreover, the magnetizing magnetic flux 100 guided by the superconducting guide section 30 is transmitted to the narrowing section 30 on the other end opening 30b side.
a, and a high magnetic flux density is applied to the surface of the rare earth magnet 12.

Therefore, according to the present invention, the rare earth magnet 1 with a large coercive force
2 can be reliably magnetized with high magnetic flux density.

In addition to this, in the device of the embodiment, the superconducting guide section 30
The constricting portion 30a is formed to be constricted in the radial direction in accordance with the surface curvature of the magnet 12.

As a result, the magnetic flux 100 narrowed down by this narrowing section 30a is oriented so as to interlink with the surface of the magnet 12 at right angles, and the magnet 12 is fully magnetized in a pattern close to the ideal shown in FIG. 4(B). be able to.

In this embodiment, the rare earth magnet 12 is located inside the other end opening 30b of the superconducting guide portion 30, but the present invention is not limited to this. Similar full magnetization can be achieved even if the magnet is located outside of the magnet.

FIG. 2 shows a second preferred embodiment of the invention.

In the embodiment, the magnet 12 is inserted from the stator side of the motor M.
Although the magnet 12 was removed and magnetized, in this embodiment, the motor stator is fully magnetized with the magnet 12 attached to it.

In this case, a set of magnetizing devices 20-1. ,． 2 (12) are prepared. Then, the openings 30b of each magnetizing device 20-1 and 20-2 are made to face the magnets 12-1 and 12-2 via the yoke 14 of the motor M,
In this state, the magnetizing coils 34 of each magnetizing device 20-1, 2C)-2 are energized and excited.

As a result, the rare earth magnet 1 attached to the yoke 14
2-1.12-2 is magnetized with a high magnetic flux density in an ideal pattern, and a motor with good characteristics can be obtained. Further, even if other parts of the motor are magnetized at this time, the holding force is small, so the motor characteristics are hardly affected.

Note that the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the gist of the present invention.

For example, in this embodiment, the case where the stator side magnet 12 of the motor is magnetized is explained as an example, but the present invention is not limited to this, and can be used to magnetize various kinds of magnetized objects as necessary. can.

[Effects of the Invention] According to the present invention, a magnetizing device is provided which can reliably fully magnetize materials to be magnetized that require strong magnetic flux for magnetization, especially rare earth materials, etc., with high magnetic flux density. There is an effect that can be obtained.

In particular, according to the present invention, even if the magnetized body is formed with a predetermined curvature, the magnetic flux can be oriented in accordance with the surface curvature. can be fully magnetized in an ideal pattern, and is particularly suitable for fully magnetizing stator-side rare earth magnets attached to motors such as motors and generators.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional schematic explanatory diagram showing a preferred example of a magnetizing device according to the present invention, FIG. 2 is an explanatory diagram of a second preferred embodiment of the present invention, and FIG. 3 is a conventional magnetizing device. An explanatory diagram showing an example, FIG. 4 is an explanatory diagram of the magnetization pattern of the stator side magnet of the motor,
A) is an explanatory diagram showing the magnetization pattern when magnetized using the conventional magnetization device, and (B) is an explanatory diagram showing the magnetization pattern obtained when magnetization is performed using the magnetization device of the present invention. It is an explanatory diagram. DESCRIPTION OF SYMBOLS 12... Magnet, 20... Magnetizing device, 30... Superconducting guide part, 30a... Squeezing part, 30b... Opening part, 34... Magnetizing coil.

Claims (2)

[Claims] (1) a magnetizing coil that generates a magnetizing magnetic flux, and a superconducting guide section formed in a cylindrical shape with the magnetizing coil located at one end opening side and the magnetizing magnetic flux passing through the inside; a constriction part provided on the other end opening side of the superconducting guide part, and the magnetizing magnetic flux guided by the superconducting guide part is constricted by the constriction part and applied to the surface of the magnetized body, A magnetizing device characterized by magnetizing a non-magnetized body with high magnetic flux density. (2) In claim (1), the narrowing portion is narrowed in accordance with the surface curvature of the magnetized body, and is oriented such that the magnetizing magnetic flux is perpendicularly linked to the surface of the magnetized body. Characteristic magnetizing device.