JPH01293603A - Magnetization device - Google Patents

Abstract

PURPOSE:To easily form a magnetization pattern having a number of weak- or non-magnetization portions at a small space by a method wherein a plurality of superconductive materials are provided evenly on the magnetization surface of a magnetization yoke having a wound wire and the wound wire is supplied with electricity with the material being in a superconductive state. CONSTITUTION:A superconductive material 16 is buried in a number of grooves 15 evenly provided in a radial form on the magnetization surface 13a of a magnetization yoke 13. The material 16 is made in a superconductive state and a wound wire 17 is electrically charged, causing a magnet 23 for a frequency generator of a rotor 20 to be magnetized. Magnetization patterns to the magnet 23 of the rotor 20 are easily formed in a wave form in which strong magnetization portions and weak- or non-magnetization portions are alternately positioned at a small space in its circumferential direction. As a result, magnetization patterns having a number of weakor non-magnetization portions at a small space is formed easily.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a magnetizing device that magnetizes a magnetized body by applying a current to a winding wound around a magnetizing yoke.

(Prior Art) Conventionally, this type of magnetizing device, for example, a magnetizing device for a magnet part for a frequency generator in a rotor of an axial gap type brushless smoke of a rotating electric machine, as shown in FIG. Winding wires 3 are wound around a plurality of poles 2 so that adjacent ones are in opposite directions, and the windings 3 are energized by a DC magnetizing power source to create a frequency generator for the rotor, which is a magnetized object. The structure is such that the magnet section is magnetized. As a result, the frequency generator magnet section obtains a magnetization pattern in which N poles and S poles are alternately magnetized along the circumferential direction (rotor rotation angle θ direction). It is.

(Problem to be Solved by the Invention) In this way, the frequency generator magnet part, which is formed with a wave-shaped magnetic pattern as shown in FIG. It generates a frequency signal according to the rotational speed by changing the frequency, so for example, in order to obtain one that can accurately detect the rotational speed,
In order to increase the frequency per rotation, a wave-shaped magnetization pattern may be formed at small intervals on the frequency generator magnet. However, when forming a wave-shaped magnetization pattern with such small intervals, in the conventional configuration, it is necessary to divide the pole 2 of the magnetization surface of the magnetization yoke 1 into a large number of parts. Not only does the structure of the magnetizing yoke 1 become complicated as There is a problem in that the process becomes complicated and the probability of short-circuit accidents between the magnetizing yoke 1 and the winding vA3 due to damage to the insulation coating of the winding 3 increases. In addition, in this case, in order to wind the winding 3, it is necessary to provide a predetermined interval between adjacent poles 2.2, which causes the problem that the number of poles that can be formed is limited. Ta.

The present invention has been made in view of the above-mentioned circumstances, and its object is to form a magnetized pattern on a magnetized body having strongly magnetized portions and weakly or non-magnetized portions alternately at small intervals; Even in this case, the structure of the celadon yoke is simple and easy to manufacture.
An object of the present invention is to provide a magnetizing device that can reduce the incidence of winding short-circuit accidents.

[Structure of the Invention] (Means for Solving the Problems) The magnetizing device of the present invention magnetizes the celadon magnetized materials to the same polarity by energizing the windings wound around the magnetizing yoke. The present invention is characterized in that a plurality of superconducting materials are provided equidistantly on the magnetizing surface of the magnetizing yoke, and the superconducting materials are brought into a superconducting state to energize the winding.

(Function) According to the magnetization device of the present invention, since the superconducting material exhibits diamagnetic properties due to the Meissner effect in the superconducting state, magnetic flux acts on the portion of the celadon magnetized material corresponding to the superconducting material. Celadon is not done or is rarely done without
Therefore, by arranging a plurality of superconducting materials evenly spaced on the magnetizing yoke, it is possible to create a magnetized pattern on the celadon-magnetized material, which has strongly celadon-magnetic parts and weakly magnetized or non-magnetized parts at small intervals. can.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 3.

First, the overall configuration will be described based on FIGS. 1 and 2. 11 is a container, and a magnetizing table 12 is disposed inside thereof. Reference numeral 13 denotes a magnetizing yoke having a cylindrical shape, and its magnetizing surface 13a has a shaft insertion hole 14 formed in the center thereof, and a large number of grooves 15 are equally distributed at a predetermined angle radially from the center. It is formed. A superconducting material 16 made of, for example, yttrium-barium material is embedded in these many grooves 15, and the upper surface of each groove is set to be flush with the magnetized surface 13a of the magnetized yoke 13. A winding 17 is wound around the outer periphery of the magnetizing yoke 13, and a mold layer 18 made of epoxy resin or the like is formed on the wound portion. Reference numeral 19 denotes a cylindrical yoke disposed to cover the outer periphery of the magnetizing yoke 13. This yoke forms a closed magnetic path together with the magnetizing yoke 13 when a celadon-magnetized material, which will be described later, is set. It is. Incidentally, an insertion hole 19a is provided in the side wall of the yoke 19 so that both terminals of the winding 17 can be led out. Reference numeral 20 denotes a magnetized body, for example, an axial gap type brushless smoke rotor, which is connected to a shaft 21a.
A main magnet part 22 made of ferrite is attached to the upper surface of a disc-shaped rotor yoke 21 having a shape, and a frequency power generation magnet part 23 made of ferrite is attached to the lower surface thereof.

The rotor 20 is placed on the magnetized surface 13a of the magnetized yoke 13 in a state where it is fitted into an annular yoke 24 attached to the upper opening of the yoke 19. In this case, the frequency generator magnet section 23 of the rotor 20 is connected to the magnetizing yoke 13.
Of course, it is in contact with the magnetized surface 13a of.

Next, the operation of this embodiment will be explained with reference to FIG. 3 as well.

When a coolant 25 such as liquid helium is injected into the container 11, each superconducting material 16 of the magnetizing yoke 13 becomes superconductive. In this state, when a high voltage (e.g. 500 to 800 volts) and high current (e.g. 1000 to 2000 amperes) are applied to the winding 17 from a DC magnetizing power source for a short period of time (e.g. several milliseconds), the magnetizing yoke The frequency generator magnet section 23 of the rotor 20 is magnetized to, for example, an N pole by the magnetic flux generated in the magnet section 13 . In this case, since the superconducting material 16 exhibits diamagnetic properties due to the Meissner effect when it is in a superconducting state, the magnetic flux generated from the magnetizing yoke 13 is transferred to the magnetizing surface 13.
The magnetization pattern of the frequency generator magnet part 23 of the rotor 20 is such that the superconducting material 16 part is weakly magnetized or non-magnetized part as shown in FIG. It becomes a wave shape. In addition, in FIG. 3, θ indicates the rotation angle of the rotor 20.

By the way, this frequency generator magnet section 23 is designed to take out a frequency signal corresponding to the rotation speed by utilizing the fact that the magnetic flux changes along its circumferential direction.
Conventionally, the fifth
The magnetized pattern shown in the figure is created, but in this example, the magnetized pattern shown in Figure 3 is created by alternately forming strongly magnetized parts and weakly or non-cyanomagnetized parts with the same polarity. , which also functions as a frequency generator magnet.

According to this embodiment, the following effects can be obtained. That is, superconducting materials 16 are embedded in a large number of grooves 15 provided radially and equidistantly on the magnetizing surface 13a of the magnetizing yoke 13, and these superconducting materials 16 are brought into a superconducting state to energize the winding 17. As a result, the frequency generator magnet portion 23 of the rotor 20 is magnetized, so that the magnetization pattern for the frequency generator magnet portion 23 of the rotor 20 is divided into strongly magnetized portions and weakly magnetized portions at small intervals along the circumferential direction. Alternatively, it is possible to easily form a wave shape in which non-magnetized portions are alternately arranged, and therefore, the rotational speed of the rotor 20 of the axial gap type brushless motor can be detected with high accuracy. Also in this case, unlike the conventional configuration in which a large number of poles 2 are provided on the magnetizing yoke 1 and the winding 3 is wound thereon, the magnetizing yoke 13 has a superconducting material 16 disposed on the magnetizing surface 13a,
A simple configuration in which the winding 17 is wound around the outer periphery is sufficient, and the insulation coating is less likely to be damaged when winding the winding m17, thereby reducing the incidence of short circuit accidents.

In the above embodiment, grooves 15 radiating from the center are provided in the magnetized surface 13a of the celadon yoke 13, and the superconducting material 16 is buried in these grooves, but the positions, lengths, and numbers of these grooves may be set as appropriate. Of course it is possible.

Further, in the above embodiment, a case has been described in which the frequency generator magnet section 23 of the rotor 20 of an axial gap type brushless motor is magnetized, but the present invention is not limited to this. Furthermore, the present invention is not limited to this, and can be applied to all rotating electric machines that require magnetization.

In addition, it goes without saying that the present invention is not limited to the embodiments described above and shown in the drawings, and can be implemented with appropriate modifications within the scope of the invention.

[Effects of the Invention] As explained above, the magnetization device of the present invention includes a plurality of superconducting materials arranged equidistantly on the magnetization surface of a magnetization yoke having a winding,
By making this superconducting material into a superconducting state and energizing the winding, the object to be magnetized is magnetized, making it easy to create a magnetized pattern that has many weakly or non-magnetized parts at small intervals. Even in this case, the structure of the celadon yoke does not become complicated, and the occurrence rate of winding short-circuit accidents can be reduced, which is an excellent effect.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a perspective view of a magnetizing yoke, FIG. 2 is a longitudinal cross-sectional view of the entire structure, and FIG.
Figure 3 is a diagram showing the magnetization pattern, and Figures 4 and 5 are diagrams showing the magnetization pattern.
The figures are a diagram corresponding to FIG. 1 and a diagram corresponding to FIG. 3 showing a conventional example. In the drawing, 13 is a magnetizing yoke, 13a is a magnetizing surface, 16 is a superconducting material, 17 is a winding, 20 is a rotor, and 23 is a frequency generator magnet (covering reef body).

Claims (1)

[Claims] 1. In a device in which the magnetized objects are magnetized to the same polarity by energizing the windings wound around the magnetizing yoke,
A magnetizing device characterized in that a plurality of superconducting materials are provided equidistantly on a magnetizing surface of the magnetizing yoke, and the superconducting materials are brought into a superconducting state and electricity is applied to the winding.