Ultrasonic step motor

Details Ultrasonic step motor Ultrasonic step motor

1992-01-17

1994-08-30

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310317, H01L 4108

Patent

active

053431081

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.

REFERENCES:
patent: 4484099 (1984-11-01), Kawai et al.
patent: 4686407 (1987-08-01), Ceperley
patent: 4692649 (1987-09-01), Izukawa et al.
patent: 4829209 (1989-05-01), Kawasaki et al.
patent: 4833359 (1989-05-01), Tanoue et al.
patent: 4882500 (1989-11-01), Iijima
patent: 5006746 (1991-04-01), Kasuga et al.
patent: 5025186 (1991-06-01), Tsukada
patent: 5073739 (1991-12-01), Iijima et al.
patent: 5079470 (1992-01-01), Kasuga et al.

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