Improved self-sensing piezoelectric actuator for dither motor rate control

Abstract

A dither motor in self-sensing actuation configuration allows each of the piezoelectric (lead zirconate titanate) elements to be used concurrently for dither rate sensing and dither motion actuation, so that system of improved efficiency and reliability can be achieved. For a self-sensing actuator, bridge circuit either fixed or adaptive is usually required to resolve the mechanical response from the control signal. In this study, a new technique for accurately extracting the mechanical response from the control signal of dither motor is developed. The measured open-loop response of the dither motor in self-sensing actuation configuration compared well with the results from a separate lead zirconate titanate sensor. Closed-loop dither rate control and frequency tracing of the dither motor are implemented and verified upon temperature variations. Method for estimating the equivalent lead zirconate titanate capacitance of the dither motor more accurately online is also provided and confirmed experimentally. The maximum error between the equivalent capacitance measured online and that measured under static conditions is about 1.2%.

Keywords

Piezoelectric materials self-sensing actuator dither motor lock-in amplifier

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