Driving circuit for an ultrasonic motor

Details Driving circuit for an ultrasonic motor Driving circuit for an ultrasonic motor

1991-07-18

1993-05-11

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310317, 310328, 318116, H01L 4108

Patent

active

052104540

ABSTRACT:
An improved driving circuit for an ultrasonic motor is disclosed. The driving circuit includes an oscillator that outputs an oscillating signal. A driving means receives the oscillation and an input control signal and outputs a drive signal that drives the ultrasonic motor. The driving means is arranged to gradually alter the driving signal in response to the input signal by modifying the oscillation signal and amplifying the modified signal. In this manner the rotational speed of the ultrasonic motor is gradually change in response to the operational condition changes ordered by the input device.

REFERENCES:
patent: 4510411 (1985-04-01), Hakamota et al.
patent: 4703213 (1987-10-01), Guasler
patent: 4713571 (1987-12-01), Suzuki et al.
patent: 4799896 (1988-06-01), Suzuki et al.
patent: 4833358 (1989-05-01), Suzuki et al.
patent: 5021700 (1991-06-01), Takahashi et al.
patent: 5036263 (1981-07-01), Yamada et al.

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