Adaptive alternating current/direct current universal electromagnetic mechanism with permanent magnet

Abstract

The invention discloses an adaptive alternating current/direct current universal electromagnetic mechanism with a permanent magnet. The mechanism comprises a moving iron core, a static iron core, a coil system, a yoke system, a permanent magnet and a polar cap of the permanent magnet. By introducing the permanent magnet to provide an initial counterforce for the electromagnetic mechanism, the problem of poor mechanical reliability when a counterforce spring is used is solved and the matching relationship between an attractive force and the counterforce is also optimized, thereby facilitating the acceleration of movement speed of the moving iron core and the improvement of sensitivity of the electromagnetic mechanism. The shape of the moving iron core is a combination of a circular truncated cone and a cylinder or a combination of a prism and a prismatic table, and the cylinder or the prism part can have a groove; based on the parameter matching between the moving iron core and the other parts in the electromagnetic mechanism, the technical bottleneck that the acting characteristics of the alternating current/direct current universal electromagnetic mechanism with a permanent magnet is influenced by the current direction of the coil system or the polarity of the permanent magnet can be overcome fundamentally, therefore, the adaptive alternating current/direct current universal electromagnetic mechanism with a permanent magnet can be applied to short-circuit current sensing, mechanism unlocking or moving contact push execution units for low-voltage alternating current/direct current electric appliances.

Description

Technical field: [0001] The invention relates to an electromagnetic mechanism with a permanent magnet, which is used for short-circuit current sensing of low-voltage AC and DC electrical appliances, mechanism unlocking or moving contact pushing away. Background technique: [0002] In the prior art, an electromagnetic mechanism is a commonly used executive component in switching appliances. Its typical structure includes a moving iron core, a static iron core, a coil system, a reaction spring, a yoke iron system and other accessories. When the current flowing through the coil system reaches a certain value, the electromagnetic attraction acting on the moving iron core will overcome the effect of the reaction force spring, and start to move towards the static iron core, and compress or elongate the spring, that is to say, as the moving iron core moves toward As the static iron core moves, the reaction force acting on the moving iron core becomes larger and larger, which is no...

AI Technical Summary

Problems solved by technology

However, the electromagnetic mechanism in these applications generally needs a reaction force spring to ensure that the moving iron core returns to the release position when the power is cut off, and the polarity installation method of the permanent magnet and the current direction of the coil are in a fixed coordination relationship, and the use must be strictly in accordance with the design. If there is an error in the production or parts replacement process, the action characteristics of the electromagnetic mechanism will change greatly, which will cause serious accidents.

[0004] For an AC electromagnetic mechanism, if it has a permanent magnet, when the polarity of the permanent magnet is determined, the change in the direction of the current in the coil system will usually cause a change in the operating characteristics of the AC electromagnetic mechanism, making the operating characteristics of this type of electromagnetic mechanism unstable

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