Pivoted lever mechanism for positioning optical mirror using electric motor - has two drive windings offset angularly to provide max torque adjacent each end position of lever mechanism

摘要

The lever mechanism is operated via the rotor of an electric motor having two controlled drive windings (10,11), the current through which provides a high initial drive torque at either end position of the lever mechanism, to overcome the permanent magnet retaining force holding it in the end position against a mechanical stop. Permanent magnets attached to the rotor or stator (8) of the electric motor provide a positive or negative drive torque over approximately half the pivot range. Pref. the two drive windings (10,11) are angularly offset by a relatively small angle, one winding providing a higher drive torque than the other. USE/ADVANTAGE - In space vehicle and for waveguide switch. For pivoting mirror through angle of 90 degrees between two stable end positions, with high accuracy.