Ultrasonic motor

Details Ultrasonic motor Ultrasonic motor

1990-12-12

1992-10-06

Budd, Mark O.

Electricity: motive power systems

Nonmagnetic motor

310316, H01L 4108

Patent

active

051534860

ABSTRACT:
An ultrasonic motor which has a driving circuit monitoring a current flowing through a piezoelectric element of the ultrasonic motor, shaping and amplifying the current, and feeding back as a control voltage to a voltage-controlled oscillating circuit, whose output is used to generate a drive signal for the ultrasonic motor. This ultrasonic motor driving circuit is provided with a rotation halt detector that detects when the ultrasonic motor stops its rotation. According to an output signal of the rotation halt detector, a reference voltage for the rectification and amplification is variably controlled.

REFERENCES:
patent: 4727276 (1988-02-01), Izukawa et al.
patent: 4749896 (1988-06-01), Suzuki et al.
patent: 4888514 (1989-12-01), Takahashi et al.
patent: 4926084 (1990-05-01), Furutsu et al.
patent: 4954742 (1990-09-01), Izukawa
patent: 4998048 (1991-03-01), Furutsu
patent: 5013982 (1991-05-01), Sasaki

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