Electricity: motive power systems – Nonmagnetic motor
Patent
1991-08-27
1993-03-30
Budd, Mark O.
Electricity: motive power systems
Nonmagnetic motor
310316, H01L 4108
Patent
active
051987325
ABSTRACT:
A control system for a progressive wave type ultrasonic motor including an ultrasonic motor driver circuit which supplies driving electric power to an ultrasonic motor and a rotary encoder which is coupled with an output shaft of the ultrasonic motor and generates a pulse signal in accordance with rotation of the ultrasonic motor, comprising a reference clock signal generator which generates a clock signal and a phase locked loop circuit which transmits a control signal to an ultrasonic motor driver circuit based on the clock signal and the pulse signal from the rotary encoder, and controlling the speed of the ultrasonic motor; and a control apparatus, comprising a driving control means which transmits a driving signal to an ultrasonic motor driver in accordance with a command pulse instructing to start driving of the ultrasonic motor and transmits a suspension signal to the ultrasonic motor driver in accordance with the pulse signal from the rotary encoder, and driving the ultrasonic motor intermittently. In addition, an automatic frequency stabilizing circuit which may be used by combining with these control apparatus. More stabilized speed control and positioning control of an ultrasonic motor become possible.
REFERENCES:
patent: 4562374 (1985-12-01), Sashida
patent: 4727276 (1988-02-01), Izukawa et al.
patent: 5010222 (1991-04-01), Suganuma
patent: 5013982 (1991-05-01), Sasaki
patent: 5023526 (1991-06-01), Kuwabara et al.
patent: 5099180 (1992-03-01), Noguchi
Budd Mark O.
Mitsubishi Jukogyo Kabushiki Kaisha
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