Electromagnetic system of double-permanent magnet three-phase alternating current contactor

Abstract

The invention provides an electromagnetic system of a double-permanent magnet three-phase alternating current contactor. The electromagnetic system comprises an iron core, two permanent magnets, two coils and an armature; two bosses are symmetrically arranged on the iron core and form a U-shaped structure; the permanent magnets are located between the two bosses and conduct magnetizing in parallelin the opposite directions, and the ends of the two permanent magnets make contact with the side walls of the two bosses respectively; the two coils are arranged on the two bosses in a sleeving moderespectively and located at the lower ends of the permanent magnets; the armature is located on the iron core and can be close to or far away from the end faces of the bosses; and the armature is provided with an elastic part which enables the armature to achieve the trend of moving in the direction of the iron core. According to the electromagnetic system of the double-permanent magnet three-phase alternating current contactor, the attraction ampere-turns of the three-phase alternating contactor is decreased, contact bouncing is reduced, the power consumption of the contactor is reduced, andthe electrical life of the contactor is prolonged.

Description

technical field [0001] The invention relates to a three-phase AC contactor, in particular to an electromagnetic system of a double permanent magnet three-phase AC contactor. Background technique [0002] Three-phase AC contactors are widely used in aerospace, national defense and civil fields. They play the role of control, protection and adjustment, and are one of the most basic devices in electrical devices. In order to improve the sensitivity of the contactor, reduce power consumption, reduce the volume, and reduce the weight, permanent magnets are usually used inside the contactor. For three-phase AC contactors containing permanent magnets, when the coil is energized, the permanent magnets are in the electromagnetic flux circuit, which has the risk of demagnetization. At the same time, due to the existence of permanent magnetic flux, the electromagnetic efficiency is reduced and the power consumption of the contactor is increased. , Sensitivity drops. The three-phase A...

AI Technical Summary

Problems solved by technology

For three-phase AC contactors containing permanent magnets, when the coil is energized, the permanent magnets are in the electromagnetic flux circuit, which has the risk of demagnetization. At the same time, due to the existence of permanent magnetic flux, the electromagnetic efficiency is reduced and the power consumption of the contactor is increased. , decreased sensitivity

The three-phase AC contactor without permanent magnets has a high pull-in voltage, and there is a phenomenon of contact bounce during the pull-in process, which not only affects the long-term operation reliability of the contactor, but also aggravates the arc ablation of the contacts, which is not conducive to Improvement of contactor life

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