Importance

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Abstract

A novel bistable actuator of the coaxial plunger type, requiring only a single electrical coil and a single permanent magnet, provides electrical remote control of extension and retraction of a locking pin in an usually long linear bidirectional power stroke whose two end positions are held stable magnetically to withstand environmental acceleration as required for missile or aerospace component locking requirements. The coil is located in a cylindrical soft iron stator shell that acts as a magnetic yoke handling the flux loop from the permanent magnet which, fitted with circular end pole plates, forms a moving armature/plunger driving the locking pin. The working magnetic air gap dimension and flux density remain substantially constant over a major central portion of the stroke so that the actuator is driven uniformly in the mode of a speaker voice coil. The magnetic holding force at the stroke ends can be independently adjusted in design.

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First Claim