Power supply frequency regulating device for vibration wave driv

Details Power supply frequency regulating device for vibration wave driv Power supply frequency regulating device for vibration wave driv

1989-05-30

1990-04-03

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310323, H01L 4108

Patent

active

049143379

ABSTRACT:
A vibration wave driven motor comprises a comparator for comparing a resonance frequency of the motor with a power supply frequency and a frequency setter for setting the power supply frequency according to a predetermined algorithm in response to the output of the comparator. The frequency setter is provided with an algorithm which, if the power supply frequency is identified lower than the resonance frequency by the comparator, brings the power supply frequency toward an optimum frequency through a predetermined frequency higher than the resonance frequency.

REFERENCES:
patent: 4510411 (1985-04-01), Hakamata et al.
patent: 4513219 (1985-04-01), Katsuma et al.
patent: 4692649 (1987-09-01), Izukawa et al.
patent: 4692672 (1987-09-01), Okuno
patent: 4713571 (1987-12-01), Suzuki et al.
patent: 4727276 (1988-02-01), Izukawa et al.

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