Magnetic latching direct current contactor

Abstract

The invention discloses a magnetic latching direct current contactor which comprises a shell and contact and electromagnetic units. Each contact and electromagnetic unit comprises a contact system and an electromagnetic system; a static contact system in each contact system comprises two static contact components relatively arranged in an upper and lower mode; each movable contact system comprises a movable iron core and a movable contact component integrally connected with the movable iron core, each movable contact component is located between the two corresponding static contact components, and as each movable iron core moves back and forth, movable contacts on the corresponding movable contact component are connected with static contacts on the corresponding upper static contact component or static contacts on the corresponding lower static contact component; each electromagnetic system comprises static iron cores symmetrically arranged at the upper end and the lower end of the corresponding movable iron core, the outside of each static iron core is provided with a coil, a permanent magnet attracting the corresponding movable contact component is arranged in each coil, and polarities of the permanent magnets in each upper coil and the corresponding lower coil are opposite; the coils in the contact and electromagnetic units are connected in parallel. The magnetic latching direct current contactor is reasonable in structure, the normally closed state and the normally open state are latched only through the permanent magnets, state latching force is large, instant contact bounce time is short, and as contact travels are decreased, pressure is increased.

Description

technical field [0001] The invention belongs to the field of low-voltage electrical appliances, in particular to a magnetic holding DC contactor. Background technique [0002] The permanent magnet contactor is a new type of contactor and also an automatic switch. Like other electromagnetic contactors, it can automatically switch on and off the circuit. The difference is that the permanent magnet contactor uses a permanent magnet drive mechanism instead of an electromagnet drive mechanism to form a micro-power contactor. [0003] The contact closure and disconnection of the permanent magnet contactor are usually held by the magnetic force of the permanent magnet. When the contacts of the contactor need to be closed or disconnected, the direction of the magnetic field generated by the electromagnetic coil is changed by changing the polarity of the coil input. Realize the state transition of contactor contact close and open. Usually, when the contact is in the holding state,...

AI Technical Summary

Problems solved by technology

[0007] 3. Place the permanent magnet on the moving contact assembly, the permanent magnet is easy to rust, and the assembly process is complicated

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