Ultrasonic motor

Details Ultrasonic motor Ultrasonic motor

1990-12-03

1992-05-19

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310325, H01L 4108

Patent

active

051151618

ABSTRACT:
An ultrasonic motor comprises a stator which generates a combined ultrasonic elliptic vibration which is a combined vibration of longitudinal and torsional vibrations, and a rotor which is in press-contact with the stator and driven by the ultrasonic elliptic vibration via a friction force between the rotor and the stator. The stator comprises a first piezoelectric element for generating the longitudinal vibration, a second piezoelectric element for generating the reacting vibration, a headmass having a large stiffness against said longitudinal vibration and a large inertial mass against the torsional vibration, and a rearmass. In the ultrasonic motor, the resonance frequencies of the longitudinal and torsional vibrations are equal, so that the ultrasonic elliptic vibration is generated efficiently on the rotor in a high power state which is adapted in practical use.

REFERENCES:
patent: 4812697 (1989-03-01), Mishiro
patent: 4885499 (1989-12-01), Ueha et al.
patent: 4965482 (1990-10-01), Ohnishi et al.
patent: 4975614 (1990-12-01), Honda

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