Ultrasonic motor

Details Ultrasonic motor Ultrasonic motor

1990-07-05

1991-09-24

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310325, 310328, 310333, H01L 4108

Patent

active

050516477

ABSTRACT:
In an ultrasonic motor which uses, as a stator, a longitudinal-torsional composite vibrator in which longitudinal and torsional piezoelectric elements are sandwiched between two blocks, and urges a rotor against the stator, a member is arranged on a piezoelectric element side of the block located near the rotor, so that an inertial mass of the member becomes larger with respect to torsional vibration than that of a rotor side.

REFERENCES:
patent: 4210837 (1980-07-01), Vasiliev et al.
patent: 4703214 (1987-10-01), Mishiro
patent: 4812697 (1989-03-01), Mishiro
patent: 4885499 (1989-12-01), Ueha et al.
patent: 4947076 (1990-08-01), Kumada
patent: 4993590 (1990-06-01), Inoue et al.
O. Ohnishi et al., "Piezoelectric Ultrasonic Motor Using Longitudinal-Torsional Composite Vibration of a Cylindrical Resonator", 1989 IEEE, 1989 Ultrasonics Symposium, pp. 739-743.
S. Takahashi et al., "Ultrasonic Motor Using Longitudinal-Torsional Composite Vibration", Proceedings by Nippon Onkyo Gakkai, Oct. 1988, pp. 821-822.

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