JPS63202006A - Magnetizing apparatus - Google Patents

Abstract

PURPOSE:To obtain effective magnetism having a designed value (specified value), by imparting the magnetism in the crossing direction along the entire length of a magnet with cooperating actions of the first magnetic flux from a main outer magnetizing body end the second magnetic flux from a main inner magnetizing body. CONSTITUTION:Rotor yokes 4 and magnets 5 are alternately arranged in a circular form. Fixing disks 8 are provided at both upper and lower end surfaces. A rotor is tightened with bolts, but a shaft is not assembled to the rotor yet. A second wiring 13 is inserted in cut-in recess parts 12 at the outer periphery in a main inner magnetizing body 11. The main body 11 is inserted into the rotor. Then the main inner magnetizing body 11 and the rotor are inserted in a main outer magnetizing body 1, in which a first winding 3 is inserted in cut-in recess parts 2 in the inner periphery. When current is conducted through the first winding 3 and the second winding 13, effective crossing magnetism is imparted to the entire length of the magnet with the cooperating actions of magnetic fluxes F1 and F2 at the outside and the inside, and the magnetizing ability is improved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a rotor magnetizing device for a synchronous motor, in which magnets are arranged between magnetically permeable yokes and radially from the outer circumference to the inner circumference. It is used to magnetize the rotor of the installed type.

[Conventional technology]

Figure 2B of the second person shows a conventional magnetizing device, Figure 2A shows a longitudinal section, and Figure KZB shows a cross section taken along line BB in Figure 2A.

As is clear from the figure, a plurality of magnets 5 and yokes 4 made of magnetically permeable material are arranged alternately, fixed disks 8 are abutted from above and below, and after tightening the upper and lower fixing plates 8, 8 with bolts 6, the shaft The assembled rotor, which has been fitted and fixed, is inserted into the magnetizer main body 1' made of a laminated body of electromagnetic steel plates, and a notched recess is formed on the inner peripheral surface of the magnetizer main body 1' corresponding to the outer end surface of the magnet of the rotor. The winding 3 inserted into the magnet 2' was energized, and the magnetic flux indicated by the arrow F generated across the magnetizer body 1' and the rotor yoke 4 caused the magnet 5 to be magnetized.

[Problem that the invention seeks to solve]

In the conventional device as described above, the magnet is magnetized by a magnetic field as shown by the dotted arrow in FIG. 2B, but the magnetic force weakens as it moves away from the winding 3, and That is, the predetermined magnetic force is not applied to the portion farthest from the winding 3.

Furthermore, at the outer end of the magnet 5, the direction of the magnetic lines of force that cross the magnet is approximately perpendicular, but inside the magnet, the direction of the lines of magnetic force tends to be inclined as shown by F'.
Therefore, the magnetization direction of the magnet is inclined near the inner end of the magnet, and as a result, the transverse direction component of the effective magnetic force generated by the magnet after magnetization is small.

Due to the above two points, the conventional magnetizing device could not obtain the effective magnetic force to a design value (predetermined value).

The present invention aims to improve the above-mentioned problems in the magnetization process and to provide a device that can rationally apply a magnetic force higher than a design value to a magnet.

[Means and effects for solving the problem] The present invention, as shown in FIG. 1B, for example, provides a rotor with yokes 4 and magnets 5 arranged alternately in a circular shape, and fixed discs 8 on both upper and lower end surfaces.
Insert the inner magnetizer main body 11 with the second winding 13 inserted into the cut recess 12 on the outer circumferential surface of the rotor, which has only been tightened with bolts and has not yet been assembled with a shaft. The inner magnetizer main body and rotor are inserted into the outer magnetizer main body 1 in which the first winding 3 is inserted into the circumferential cut recess 2, and the first winding and the second winding are energized. As shown by the dotted arrow in FIG. 1B, when both windings are energized, a first magnetic flux F1 and a second magnetic flux F are generated, and the magnet 5
From the outer end to the center K is a magnetic flux F1, and the inner end is an auxiliary magnetic flux F.

, the inner end of the magnet 5a is also magnetized by the addition of the auxiliary magnetic flux F, which is approximately the same as the outer end and center, and the magnetic flux F between the outside and inside is also
, F, so that only a substantially transverse effective magnetic force is applied over the entire length of the magnet.

〔Example〕

FIGS. 1A and 1B are a longitudinal sectional view and a transverse sectional view, respectively, of essential parts of an embodiment of the present invention.

As shown in the figure, an outer layer porcelain body 1 made of a laminate of electromagnetic steel sheets is prepared, and a plurality of recesses 2 having regular intervals are formed on the inner peripheral surface.
A cut was made along the entire length of the main body, and the first winding 3'' was inserted into the cut recess.

On the other hand, the same number of recesses 12 as the outer magnetizer are cut in the outer peripheral surface of a cylinder having approximately the same length as the outer magnetizer main body, and the same number of recesses 12 are cut at regular intervals along the entire length of the cylinder, and the second winding 13 is inserted into the cut recesses 12. An inner magnetizer main body was constructed, and a magnetizing device for a rotor for a synchronous motor was constructed with an outer magnetizer and an inner magnetizer for core arrangement.

In the device of this embodiment, six magnets 5 having a rectangular cross section and six yokes having a fan-shaped cross section each made of a laminate of electromagnetic steel sheets are arranged alternately so as to have a shaft through hole H1 in the center. This is used for magnetizing a rotor in which bolts 6 are inserted and screwed into both fixed disks 8, 8 and yoke 4, with fixed disks 8.8 having shaft through holes H3 in contact with the upper and lower end surfaces.

The magnetizing operation of the obtained device is carried out by inserting the inner magnetizer main body 11 into the shaft through hole H1 of the rotor, and then inserting it into the cylindrical inner hole H of the outer magnetizer main body 1 to set it in a magnetized state. , the first winding 3 and the second winding were energized.

As a result of energizing both windings, the first magnetic flux F1 is generated by the first winding 3 and the second magnetic flux is generated by the second winding 13, as shown by the dotted line arrows in FIG. 1B. The magnetic flux F1 mainly acts from the outer end to the center of the magnet 5, and the small magnetic flux F of the small winding 13 mainly acts on the inner end of the magnet 5, so that the magnet 5 can be magnetized uniformly.

Further, from the center to the inner end of the magnet 5, the magnetic flux acts in a state substantially transverse to the cross section of the magnet (FIG. 1B) due to the interaction between the first magnetic flux F1 and the second magnetic flux F. ,
Magnetization was achieved as a nearly transverse magnetic force over the entire length of the magnet cross section.

After magnetizing the rotor, which consists of a yoke and magnets, a rotor equivalent to the conventional one could be obtained by inserting and fixing the shaft.

〔Effect of the invention〕

Magnets arranged radially inward from the outer periphery of the rotor can be magnetized uniformly over the entire length.

Due to the interaction of the first magnetic flux from the outer magnetizer body and the second magnetic flux from the inner magnetizer body, the entire length of the magnet can be magnetized in the transverse direction.

[Brief explanation of the drawing]

FIG. 1A is a vertical cross-sectional view of the main part of the embodiment of the present invention, and the first
Figure B is an explanatory diagram of the action of the B-Blli plane in Figure 1A. FIG. 2A is a vertical sectional view of a main part of the conventional example, and FIG. 2B is an explanatory view of the operation taken along the line BB in FIG. 2A. 1: Outer magnetizer body, 2: Notch recess, 3: First winding,
4: Yoke, 5: Magnet, 6 Nigold, 11: Inner magnetizer body, 12: Notch recess, 13: Second winding, Ft
:@11 magnetic, F, :2nd magnetic flux. 1... Outer magnetizer main body 2... Notch recess 3... First winding 4... Yoke 5... Magnet 6... Bolt 11-3 - Inner magnetizer main body 12... Notch recess 13...Second winding Fl...First magnetic flux F2...Second magnetic flux

Claims (1)

[Claims] 1. A cylindrical outer magnetizer (1) with a plurality of cut recesses (12) arranged on the inner peripheral surface and a first winding (3) inserted into the recesses, and an outer magnetizer (1). An inner magnetizer (
11) A magnetizing device in which a rotor magnet (5) inserted between both magnetizers is magnetized from the outside and the inside.