Circuitry for driving ultrasonic motor

Details Circuitry for driving ultrasonic motor Circuitry for driving ultrasonic motor

1989-03-10

1990-08-28

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310323, H01L 4108

Patent

active

049528343

ABSTRACT:
Circuitry for driving an ultrasonic motor in which a rotor is driven by travelling waves generated by a piezoelectric effect, which circuitry includes a pulse generator for generating pulses applied to the ultrasonic motor for driving the same, a driving pulse width changing circuit for changing the width of the driving pulse to change the rotational speed of the motor, a feed-back piezoelectric element provided on the motor for generating a feed-back signal in response to the rotational speed of motor, and a driving frequency automatic tracking circuit responsive to the feed back signal from the motor for generating a voltage signal to control the pulse generator.

REFERENCES:
patent: 4277710 (1981-07-01), Harwood et al.
patent: 4794294 (1988-12-01), Shimizu et al.
patent: 4833358 (1989-05-01), Suzuki et al.

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