Ultrasonic step motor
March 11, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesPiezoelectric vibration wave motor with multiple traveling wave generating members Split mode traveling wave ring-resonator Driving circuit of a vibration wave motor Ultrasonic motor with stator projections and at least two concentric rings of electrodes Driving apparatus for ultrasonic motor Method for converting standing wave vibrations into motion and standing wave motor therefor Travelling-wave motor Ultrasonic motor Ultrasonic motor Ultrasonic motor having high drive efficiency InventorsAssigneeApplicationNo. 012486 filed on 02/01/1993US Classes:310/323.08ArmatureExaminersPrimary: Budd, Mark O.Attorney, Agent or FirmForeign Patent References
International ClassH01L 041/08Foreign Application Priority Data1991-01-17 JPAbstractAn ultrasonic step motor includes a stator and a rotor. A vibrator is mounted on the stator and a driving mechanism excites the vibrator causing the stator to induce a vibrating mode on the rotor. The rotor has a vibration mode in a selected direction and the stator exhibits a plurality of vibrating states which are changed in a time sequential manner. The vibrating states of the stator include a composite vibration of a travelling wave formed from two standing wave vibrations and a standing wave vibration. The rotor is formed of a non-uniform rigidity and mass distribution and the stator is formed with relief portions formed therein corresponding to loops of a standing wave vibration and projections corresponding to the nodes of the standing wave vibration.Field of SearchWith mechanical energy coupling means | |
