Ultrasonic step motor

Details Ultrasonic step motor Ultrasonic step motor

1993-02-01

1997-03-11

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

H01L 4108

Patent

active

056104685

ABSTRACT:
An 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.

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