Control device for ultrasonic motor

Details Control device for ultrasonic motor Control device for ultrasonic motor

1991-03-06

1992-12-22

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

318116, 318135, 310323, H01L 4108

Patent

active

051736306

ABSTRACT:
A control device for an ultrasonic motor which is suitable for use in controlling the speed of the ultrasonic motor includes an oscillator for generating drive signals of a resonant frequency of the ultrasonic motor; and a drive signal restricting device for turning on and off the drive signals at a fixed duty ratio. The control device further includes a counter in which counted results of the counter are incremented by a first pulse signal whose frequency increases as a target speed of the ultrasonic motor increases, and in which the counted results are decremented by a second pulse signal whose frequency increases as a travel speed of the ultrasonic motor increases; and a duty ratio setting device for causing the duty ratio to increase as the counted results of the counter increase.

REFERENCES:
patent: 4857791 (1989-08-01), Uchino et al.
patent: 4926084 (1990-05-01), Furutsu et al.
patent: 4954741 (1990-09-01), Furutsu et al.
patent: 4998048 (1991-03-01), Furutsu et al.
patent: 5013982 (1991-05-01), Sasaki

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