Drive control device in an ultrasonic vibration motor
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United States of America Patent
Stats
-
Mar 14, 1989
Grant Date -
N/A
app pub date -
Nov 6, 1987
filing date -
Nov 11, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A ultrasonic vibration motor comprises a moving member, a vibration member contacted by the moving member, an electrostrictive device provided on the vibration member, a power supply for applying a periodic voltage to the electrostrictive device to thereby vibrate the electrostrictive device and generate a travelling vibration wave in the surface of the vibration member, a device for detecting the phase difference between the voltage applied to the electrostrictive device and the current flowing into the electrostrictive device, and a device for discriminating a variation in the load of the moving member on the basis of the phase difference.
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