Input frequency control device for surface acoustic wave motor

Details Input frequency control device for surface acoustic wave motor Input frequency control device for surface acoustic wave motor

1986-11-12

1988-05-10

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310323, 310328, H01L 4108

Patent

active

047437880

ABSTRACT:
A surface acoustic wave motor utilizing ultrasonic vibration has an elastic member and piezoelectric elements for vibrating the elastic member. The motor is provided with a monitor voltage detecting circuit for detecting a monitor voltage generated by the vibration, from a portion of the piezoelectric elements not receiving the input voltage, and a frequency control circuit for controlling the input power supply frequency in such a manner that the monitor voltage assumes a predetermined value lower than a maximum monitor voltage obtained at the resonance frequency of the stator consisting of the elastic member and piezoelectric elements, in a frequency range higher than the resonance frequency.

REFERENCES:
patent: 4484099 (1984-11-01), Kawai et al.
patent: 4504760 (1985-03-01), Yamamoto et al.
patent: 4510411 (1985-04-01), Hakamata et al.
patent: 4513219 (1985-04-01), Katsuma et al.

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