Control device for ultrasonic motor

Details Control device for ultrasonic motor Control device for ultrasonic motor

1992-04-29

1993-11-02

Shoop, Jr., William M.

Electricity: motive power systems

Linear-movement motors

310316, 310323, 318460, H01L 4108

Patent

active

052586944

ABSTRACT:
A control device for an ultrasonic motor for controlling to drive the ultrasonic motor according to a logical AND operation between a control pulse having a duty ratio changing from 100% to 0% according to a moving position of the ultrasonic motor and a driving signal having a resonance frequency of the ultrasonic motor. Accordingly, after starting the ultrasonic motor at a maximum speed, a moving speed of the ultrasonic motor can be gradually reduced until it reaches a target position, and when reaching the target position, the ultrasonic motor can be stopped precisely at the target position.

REFERENCES:
patent: 4613782 (1986-09-01), Mori
patent: 4716347 (1987-12-01), Fujimoto
patent: 4853579 (1989-08-01), Kawasaki et al.
patent: 4914336 (1990-04-01), Yamasaki
patent: 4929859 (1990-05-01), Suzuki et al.
patent: 4952834 (1990-08-01), Okada

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