Piezoelectric stack actuator parameter extraction with hysteresis compensation

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Abstract

The Piezoelectric Actuator Drive (PAD) is a type of rotary motor that transforms the linear motion of piezoelectric stack actuators into a precise rotational motion. The very high stiffness of the actuators employed make this type of motor suited for open-loop control, but the inherent hysteresis exhibited by piezoelectric ceramics causes losses. Therefore, this paper presents a straightforward method to measure piezoelectric stack actuator equiv- alent parameters that includes nonlinearities. By folding the nonlinearities into a newly-defined cou- pling coefficient, the inherent hysteretic behavior of piezoelectric stack actuators can be greatly reduced through precompensation. Experimental results show a fitting accuracy of 98.8 % between the model and measurements and a peak absolute error reduction by a factor of 10 compared to the manufacturer- provided parameter. This method improves both the static and dynamic performance of the Piezoelectric Actuator Drive (PAD) while still permitting open-loop control.
Original languageEnglish
Title of host publicationProceedings of EPE'14 ECCE Europe
Number of pages7
PublisherIEEE
Publication date2014
ISBN (Print)978-1-4799-3014-2
DOIs
Publication statusPublished - 2014
Event16th Conference on Power Electronics and Applications - Lappeenranta University of Technology, Lappeenranta, Finland
Duration: 26 Aug 201428 Aug 2014

Conference

Conference16th Conference on Power Electronics and Applications
LocationLappeenranta University of Technology
CountryFinland
CityLappeenranta
Period26/08/201428/08/2014

Keywords

  • Piezo actuators
  • Non-standard electrical machine
  • Servo-drive
  • Regulation
  • Measurement

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