Drive method for ultrasonic motor providing enhanced stability o

Details Drive method for ultrasonic motor providing enhanced stability o Drive method for ultrasonic motor providing enhanced stability o

1987-08-25

1989-08-01

Budd, Mark O.

Electrical generator or motor structure

Dynamoelectric

Rotary

318116, 310323, H01L 4108

Patent

active

048535796

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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