Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1994-10-07
1995-12-19
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
H01L 4108
Patent
active
054770998
ABSTRACT:
A driving device for an ultrasonic wave motor has a limit detecting circuit for that the drive voltage for the ultrasonic wave motor has reached a limit, and, in response, a drive voltage limiting circuit controls the drive voltage so as not to go beyond the limit value. Such control is conducted on the voltage or frequency of a signal for driving the ultrasonic wave motor. In another aspect of the invention, a drive state detecting circuit detects the drive state of the ultrasonic wave motor, and a drive frequency (or voltage) setting circuit controls the frequency (or voltage) of a signal for driving the ultrasonic wave motor so as to attain the maximum efficiency in the motor, based on the output of the drive state detecting circuit.
REFERENCES:
patent: 4743788 (1988-05-01), Takagi et al.
patent: 4833358 (1989-05-01), Suzuki et al.
patent: 4853579 (1989-08-01), Kawasaki et al.
patent: 5376855 (1994-12-01), Suganuma
Patent Abstracts of Japan, unexamined applications, E field, vol. 13, No. 92, Mar. 3, 1989, The Patent Office Japanese Government, p. 95 E 722; (JP-A-63 268 474).
Patent Abstracts of Japan, unexamined applications, E field, vol. 12, No. 397, Oct. 21, 1988, The Patent Office Japanese Government, p. 8 E 673, (JP-A-63 140 678).
Budd Mark O.
Nikon Corporation
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