Electromagnetic leakage tripping device, machined surface treatment method and application thereof

Abstract

The invention discloses an electromagnetic leakage tripping device, which comprises an armature and a magnet yoke which is heated and shaped by using soft magnetic alloy (1J50) with high magnetic conductivity and higher saturated magnetic induction strength. The magnet yoke is riveted with an annular alnico permanent magnet, and the surface of the magnet yoke is subjected to ground finish and surface treatment to form a magnetic loop with the length of 37 millimeters. The electromagnetic leakage tripping device is characterized in that the annular alnico permanent magnet in the tripping device comprises the following alloy components in percentage by atoms: 7.3 percent of Al, 14.2 percent of Ni, 38.2 percent of Co and 5.8 percent of Ti; and through melting heat treatment, the residual magnetic flux density Br of the permanent magnet is more than 8,500Gs, and the coercive force Hc is more than 1,500Oe.

Description

technical field [0001] The invention relates to an electromagnetic leakage release, in particular to the processing method, surface treatment process and application of the release. Background technique [0002] The electromagnetic leakage release is the core component of the residual current operated circuit breaker. The stability and reliability of the release determine the performance of the circuit breaker. Related to the design of the magnetic circuit, the operating power of the release is a measure. [0003] For now, the usual practice is to use low-performance (category 6) permanent magnets to directly manufacture releases after simple grinding and cleaning of the yoke and armature. This process brings the following problems: [0004] One is that the material of the yoke and armature is iron-nickel alloy (1J50), which is easy to rust under the conditions of temperature and humidity. The work fails, and the circuit breaker protection function is lost; [0005] The s...

AI Technical Summary

Problems solved by technology

[0004] One is that the material of the yoke and armature is iron-nickel alloy (1J50), which is easy to rust under the conditions of temperature and humidity. The work fails, and the circuit breaker protection function is lost;

[0005] The second is to use low-performance Class 6 permanent magnets as the magnetic source of the magnetic circuit. The coercive force of the magnetic steel is low and the demagnetization curve is steep, so it is easy to cause the working point of the release to drift, which will change the leakage protection characteristics of the circuit breaker and give The use of security brings hidden dangers

[0006] The third is that the minimum operating power of the release can only be 200μVA, which is difficult to use for high-current circuit breakers, especially A-type leakage circuit breakers cannot meet the requirements