A contactor polarized magnetic circuit structure

Abstract

Provided is a contactor polarized magnetic circuit structure comprising a magnetic conductive cover, armatures, an electromagnetic component and yoke iron. The electromagnetic component comprises a setting coil set, a magnetic steel set, a reset coil set and pole shoes which are superposed from the top to the bottom. The pole shoes are fixed in hollow cavities of the setting coil set, the magnetic steel set and the reset coil set, and the middle parts are provided with guiding cavities. The magnetic steel set comprises an internal magnetic conductive coil, a magnetic steel piece and an external magnetic conductive coil which are fixedly connected from inside to outside in turn. The magnetic steel piece is made of permanent magnet materials. The armatures are arranged in the guiding cavities of the pole shoes and can move upwardly and downwardly in the guiding cavities along an axial direction. The magnetic conductive cover is covered on the electromagnetic component and the yoke iron from the top to the bottom, and the top wall of the magnetic conductive cover is clung to the top surface of the setting coil set. The internal side wall of the magnetic conductive cover and the external circumferential wall of the external magnetic conductive coil and the external circumferential wall of the yoke iron are matched in an interference way so that a closed magnetic circuit is formed. Therefore, maintenance force of the product in the state is greatly enhanced and mechanical environment adaptability of the product is provided.

Description

Technical field [0001] The invention relates to a polarized magnetic circuit structure of a mechanical electromagnetic relay, which is particularly suitable for improving the mechanical resistance of a direct-acting high-voltage direct current high-power contactor. Background technique [0002] The drive part of the existing self-holding high-voltage DC high-power contactor generally adopts solenoid direct drive. The polarized magnetic circuit used usually has an air gap in the magnetic circuit in a certain working state of the product, resulting in the magnetic circuit not being closed. The magnetic efficiency is low. The characteristics of this structure determine that the mechanical environment resistance performance in the solenoid axis direction is poor, especially the impact resistance can only be up to 30G, which greatly limits the application fields of such products. For this reason, the technical problem that those skilled in the art urgently need to solve is to provide ...

AI Technical Summary

Problems solved by technology

[0002] The driving part of the existing self-holding high-voltage DC high-power contactor is generally driven by a solenoid direct drive. The polarized magnetic circuit used usually has an air gap in the magnetic circuit in a certain working state of the product, resulting in the magnetic circuit not being closed. The magnetic efficiency is low. The characteristics of this structure determine that the mechanical environment resistance performance in the axial direction of the solenoid is poor, especially the impact resistance can only reach a maximum of 30G, which greatly limits the application fields of this type of product.

Images