Patent ID: 6147434
Filing Date: 2000-11-14
Classification: H02N

Abstract:
A drive device comprising:a member assembly;an electromechanical transducer;a drive member, fixedly coupled to the electromechanical transducer, being frictionally coupled to the member assembly;a drive controller for providing a drive signal to the electromechanical transducer, said drive signal controlling elongation and contraction of the electromechanical transducer to effect relative motion between the member assembly and the drive member;a state sensor for measuring an environmental state and for providing to the drive controller a state signal corresponding to the environmental state; anda correction data storage device for storing predetermined correction data and for providing the predetermined correction data to the drive controller, wherein the predetermined correction data can be used by the drive controller to adjust the relative position between the member assembly and the drive member based on the state signal provided by the state sensor.