Method and device for electrically exciting an actuator for an ultrasonic motor
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United States of America Patent
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Oct 25, 2016
Grant Date -
Nov 21, 2013
app pub date -
Sep 28, 2011
filing date -
Oct 1, 2010
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Abstract
A method for electrically exciting a piezoelectric actuator of an ultrasonic motor is described. The ultrasonic motor has at least one acoustic standing wave generator, including an exciter electrode and a general electrode, wherein a capacitance C0 is developed between the exciter electrode and the general electrode. The method includes: applying a rectangular exciter voltage Ug to the exciter electrode and the general electrode of the acoustic standing wave generator; providing a voltage Ug with the aid of a feedback element; separating a voltage up from a voltage uc with the aid of a pulse filter; and changing the frequency of the rectangular exciter voltage in such a way that the phase shift between the piezoelectric current Ip and the rectangular exciter voltage Ug is substantially zero. A device for electrically exciting a piezoelectric actuator of an ultrasonic motor is also described.
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