Method and circuit for exciting and monitoring a piezoelectric m

Details Method and circuit for exciting and monitoring a piezoelectric m Method and circuit for exciting and monitoring a piezoelectric m

1996-11-12

1998-11-10

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

318116, H01L 4108

Patent

active

058348760

ABSTRACT:
The invention concerns a method for exciting and monitoring a piezoelectric motor (M1) in stepping mode, the motor having a resonance frequency (f.sub.R) and being supplied electrically at an excitation frequency (f.sub.E) during each operating step.
The method is characterized in that it comprises a monitoring phase which extends at least over several successive steps of said motor and in which, for a present step of said motor, a determined excitation frequency value (f.sub.E +1) is used, the duration (t.sub.E +1) of the present step is measured, said duration (t.sub.E +1) is compared to the duration (t.sub.E) of the preceding step and, according to the result of this comparison, said excitation frequency value (f.sub.E +2) is corrected for the following step in a direction tending to reduce the duration of the step.
A circuit is also described which enables the implementation of the method.

REFERENCES:
patent: 4998048 (1991-03-01), Furutsu
patent: 5198732 (1993-03-01), Morimoto
patent: 5214339 (1993-05-01), Naito
patent: 5479063 (1995-12-01), Suganuma
patent: 5493163 (1996-02-01), Nishikawa
patent: 5495152 (1996-02-01), Fukui
patent: 5661359 (1997-08-01), Katsuragawa

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