Linear piezoelectric motor employing internal feedback

Details Linear piezoelectric motor employing internal feedback Linear piezoelectric motor employing internal feedback

1998-01-07

1999-09-07

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

31031602, 31032302, 318116, H01L 4108

Patent

active

059491779

ABSTRACT:
A piezoelectric motor system is formed with a piezoelectric motor incorporating an element that is physically displaced as a function of an applied voltage resulting in the generation of a back electromotive force. The system incorporates a controller having an output connected to the piezoelectric motor. The controller receives a direction signal indicating the desired drive direction of the piezoelectric motor and a velocity signal indicating the desired velocity of the piezoelectric motor. The controller provides a drive voltage for driving the piezoelectric motor in the desired drive direction. An electrical equivalent circuit that mirrors the electrical characteristics of the piezoelectric motor is connected to receive the drive voltage from the controller. A comparator provides a difference signal indicative of the difference in voltage developed across the piezoelectric motor and the voltage developed across the electrical equivalent circuit. An integrating circuit receives the difference signal and provides a feedback signal to the controller. The difference signal is compared with the velocity signal to either increase or decrease the drive voltage applied to the piezoelectric motor so as to cause the piezoelectric motor to achieve the desired velocity.

REFERENCES:
patent: 4658172 (1987-04-01), Izukawa
patent: 4888514 (1989-12-01), Takahashi et al.
patent: 4939402 (1990-07-01), Hirayama et al.
patent: 5192889 (1993-03-01), Myohga
patent: 5453653 (1995-09-01), Zumeris
patent: 5616979 (1997-04-01), Nishikawa
patent: 5616980 (1997-04-01), Zumeris

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