Driving circuit for vibration wave driven motor

Details Driving circuit for vibration wave driven motor Driving circuit for vibration wave driven motor

1992-02-25

1992-11-17

Wysocki, A. Jonathan

Electricity: motive power systems

Nonmagnetic motor

310316, 310323, H01C 408

Patent

active

051650479

ABSTRACT:
A driving circuit for a vibration wave driven motor, having a comparator detecting the drive state of the motor, and the drive frequency somewhat increased immediately before the motor reaches the resonance drive state. Also a second comparator is additionally provided for detecting the drive state of the motor at a second frequency higher than the frequency detected by the first-mentioned comparator, and the drive frequency of the motor is retained if the second comparator detects that the motor is driven with the second frequency.

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patent: 4713571 (1987-12-01), Suzuki et al.
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patent: 4849872 (1989-07-01), Gassler
patent: 4853579 (1989-08-01), Kawasaki et al.

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