Drive control apparatus for an ultrasonic motor

Details Drive control apparatus for an ultrasonic motor Drive control apparatus for an ultrasonic motor

1991-02-07

1992-07-14

Budd, Mark O.

Electricity: motive power systems

Nonmagnetic motor

310316, H01L 4108

Patent

active

051306190

ABSTRACT:
A drive control apparatus for an ultrasonic motor having a vibrator with a piezoelectric element and an elastic element. The apparatus comprises a power source for supplying alternating power to the piezoelectric element, a voltage detecting device for detecting a voltage applied to the vibrator, a sensor for detecting a vibrator state signal dependent on vibrating velocity of the vibrator, and a control device for controlling the ultrasonic motor with reference to the vibrator state signal. For automatic resonant frequency tracking control, the control device controls oscillating frequency of the power source to maintain a phase difference between frequency of the vibrator obtained from the vibrator state signal and frequency of the voltage supplied to the vibrator at a predetermined value. For constant velocity amplitude control, the control device controls output voltage of the power source to maintain the vibrator state signal at a predetermined value.

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patent: 5013982 (1991-05-01), Sasaki
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