Demagnetization method for permanent recuperation magnet steel by made-to-measure demagnetization clamper

Abstract

The invention discloses a demagnetization method of permanent recovery magnetic steel by a special demagnetization fixture, wherein, the fixture consists of a fixture body, a fixed magnetic pole and a movable magnetic pole. The paired fixed magnetic pole and the movable magnetic pole are symmetrically arranged at two ends of the fixture body, the fixture body is produced by materials with high magnetic resistance, the fixed magnetic pole and the movable magnetic pole are produced by soft magnetic materials, one end of the movable magnetic pole is directly contacted on the permanent recovery magnetic steel while the other end is contacted with the fixed magnetic pole, and the fixture is utilized to allow an alternating magnetic field which is generated by a demagnetization coil of the prior alternating current solenoid to be directly acted on a hoof-shaped permanent magnetic steel, thereby achieving the demagnetization method with the greatest extent and the greatest efficiency.

Description

1. Technical field [0001] The invention relates to the field of relays, in particular to a method for demagnetizing permanently restored magnetic steel with a special demagnetization fixture for a rotary electromagnetic relay. 2. Background technology [0002] In the electromagnetic system of the traditional balanced armature rotary electromagnetic relay, the elastic element is generally used as the restoring force, because the restoring force generated by the elastic element is easier to control, and various shapes can be realized smoothly. With the further development of relays and the introduction of permanent magnets, more and more balanced armature rotary electromagnetic systems begin to use permanent magnets as the restoring force, because permanent magnets have extremely strong thermal stability and mechanical properties. Stability, and the restoring force produced by the permanent magnet steel is just opposite to that produced by the elastic element, and its restorin...

AI Technical Summary

Problems solved by technology

In this kind of magnetic circuit, the external magnetic field will not affect the permanently restored magnet. Therefore, the conventional demagnetization method is to charge and demagnetize the restored magnet by applying an external alternating magnetic field, and it is difficult to achieve normal demagnetization.

[0004] At the same time, in the permanent magnet restoration balanced armature rotary electromagnetic system, the permanent magnet restoration magnets are pre-magnetized and then assembled. After the magnets are installed in the electromagnetic system, the magnets cannot be re-magnetized, so If the magnetic steel is too weak or magnetically disordered during the demagnetization process, the whole machine will be scrapped.

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