Permanent magnet intelligent contactor having electromagnetic controllable counterforce and capable of guaranteeing normal switching-off

Abstract

The invention relates to a permanent magnet intelligent contactor having electromagnetic controllable counterforce and capable of guaranteeing normal switching-off. The permanent magnet intelligent contactor comprises a mechanical system and an electric control system. The mechanical system comprises a movable iron core, a stationary iron core, a coil, a movable iron core connecting part, a lower insulating shell, an upper insulating shell, a contact spring, a movable contact component, a stationary contact component and two non-linear counterforce springs. The electric control system is connected with the coil. The electric control system comprises a CPU control module and a switching-on and switching-off control module, and switching-on and switching-off control over the permanent magnet intelligent contactor is achieved. The movable iron core is an iron core formed by iron core combinations made of permanent magnets and semihard magnetic alloy or residual-magnetism-free iron cores. The permanent magnets are inlaid in the lower portions of movable iron core posts. Three faces of each permanent magnet are wrapped by the iron core posts made of the corresponding semihard magnetic alloy or residual-magnetism-free iron cores. The majority of loss power in the iron cores and the coil can be saved, meanwhile, noise is reduced or eliminated, the temperature rise of the coil is lowered, and the service life of the permanent magnet intelligent contactor is prolonged.

Description

technical field [0001] The invention relates to the field of intelligent control of high and low voltage switching appliances, in particular to a permanent magnet intelligent contactor with electromagnetic controllable reaction force and capable of ensuring normal opening. Background technique [0002] Liu Yushu and others published the article "Application of Semi-hard Magnetic Materials in Magnetic Latching Contactors" in "Metallic Materials Research", Volume 15, Issue 6, December 1989, which introduced that magnetic holding contactors use semi-hard magnetic materials with high The remanent magnetism and coercive force can be controlled within a certain range. After the current is applied, the core has remanence, and the contactor does not need to be energized when it is working. Moreover, since the holding state of the contactor during working time is based on the residual magnetism of the semi-hard magnetic material, it will not be affected by voltage fluctuations. Gen...

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Problems solved by technology

The permanent magnet can provide a stable magnetic field, which is an advantage, but it is also a disadvantage under normal conditions, which will make the contactor inseparable without electricity. Therefore, in order to solve this problem, the present invention designs a nonlinear spring to offset the permanent magnet. The magnetic force of the magnet enables the contactor to separate normally under normal conditions

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