Driving apparatus for ultrasonic motor

Details Driving apparatus for ultrasonic motor Driving apparatus for ultrasonic motor

1988-10-13

1989-12-19

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310323, H01L 4108

Patent

active

048885142

ABSTRACT:
In a driving apparatus for ultrasonic motor, a variable oscillator (44) varies oscillating frequency responding to current level of detected current which flows to a piezoelectric member (1, 2) and is in proportion to mechanical vibration of the piezoelectric member (1, 2) when mechanical resonance frequency varies by change of environmental condition.

REFERENCES:
patent: 4658172 (1987-04-01), Izukawa
patent: 4692649 (1987-09-01), Izukawa et al.
patent: 4727276 (1988-02-01), Izukawa et al.
patent: 4749896 (1988-06-01), Suzuki et al.
Atsudenzaikagaku No Kiso (Fundamental Science of Piezoelectric Materials) by Takura Ikeda, issued by OHM Sha Japan.

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