Piezoelectric stack actuator parameter extraction with hysteresis compensation

2014 International Power Electronics and Application Conference and Exposition

et al. 2014

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-The Piezoelectric Actuator Drive (PAD) is an accurate, high-torque rotary piezoelectric motor that employs piezoelectric stack actuators and inverse hypocycloidal motion to generate rotation. Important factors that determine motor performance are the proper concentric alignment between the motor ring and shaft and the similarity of the stack actuators used. This paper investigates the electromechanical coupling of these factors into the motor current through experimental means.

Section: Measurement Resultsmentioning

confidence: 99%

Investigating the electromechanical coupling in Piezoelectric Actuator Drive motor under heavy load

2014 International Power Electronics and Application Conference and Exposition

et al. 2014

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“…As mentioned in the introduction, a disadvantage of piezoelectric ceramics is the high level of hysteresis they exhibit between the applied voltage signal and the resulting displacement. This is even more pronounced in PMAs, where the real elongation of the actuator can vary by over 20% through the middle of the stroke [5], as shown in Fig. 5a.…”

Section: Hysteresis Effects and Compensation Methodsmentioning

confidence: 93%

“…A simple way of eliminating PMA hysteresis is to measure the extent of the effect and forward-compensate for it by adapting the driving signals, as proposed in [5]. This method was proven to reduce the absolute positioning error of the actuator under test by a factor of 10.…”

Section: Hysteresis Effects and Compensation Methodsmentioning

confidence: 99%

Control and sensor techniques for PAD servo motor drive

2015 50th International Universities Power Engineering Conference (UPEC)

et al. 2015

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The Piezoelectric Actuator Drive (PAD) is a new type of electrical motor that employs piezoelectric multilayer actuators coupled with a form-fitted micro-mechanical gearing to generate rotary motion. The PAD is precise, having a positioning error of less than 2 arc-seconds. Its typical output torque is 4 N m, without any additional gearing. The whole motor is fully non-magnetic, enabling its use in applications where magnetic neutrality is of importance. The main challenges of the PAD are the hysteretic behavior of the ceramic actuators used and their highly capacitive nature. After compensating for the hysteretic behavior, the current waveforms of the motor can be used to extract all necessary parameters for sensorless operation. Moreover, these signals provide a qualitative information about the precision in motor centering and show any mismatch between the actuators used.

“…These actuators exhibit desirable properties such as large stiffness and a reversibility of the piezoelectric effect, enabling them to act as both actuators and sensors [4]. Nevertheless, two dominating nonlinearities persist in the control of piezoelectric-based actuation, namely hysteresis and creep [5]. Of the two effects, hysteresis has a much larger impact on the positioning precision of the motor, especially under dynamic operation.…”

Section: Introductionmentioning

confidence: 99%

Preisach model of hysteresis for the Piezoelectric Actuator Drive

IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society

et al. 2015

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-The Piezoelectric Actuator Drive (PAD) is a precise piezoelectric motor generating high-torque rotary motion, which employs piezoelectric stack actuators in a wobblestyle actuation to generate rotation. The piezoelectric stacked ceramics used as the basis for motion in the motor suffer from hysteretic nonlinearities. In order to model these nonlinearities, the first-order hysteresis reversal curves of the actuators are measured and a discrete Preisach model is derived. This forms a basis that enables the study of different compensation methods. The results show matching between measured and estimated responses within 95.8%