Drive method for ultrasonic motor providing enhanced stability of rotation
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United States of America Patent
Stats
-
Aug 1, 1989
Grant Date -
N/A
app pub date -
Aug 25, 1987
filing date -
Aug 26, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of driving an ultrasonic motor having a rotation body (6) which is rotated by travelling waves generated in a vibrator body (3), whereby the drive frequency of the motor is controlled in accordance with the value of an operating parameter such as phase difference between drive current and voltage, such as to maintain the drive frequency at a value which is lower than the antiresonance frequency of the vibrator body (3) and higher than a highest resonance frequency of the vibrator body (3) in a hysteresis loop exhibited by a resonance frequency characteristic of the vibrator body (3). Continuous stable operation is attained, irrespective of the effects of temperature and load changes upon the motor operating characteristics.
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