Charge Estimation of Piezoelectric Actuators: A Comparative Study

Morteza Mohammadzaheri (), Sami Al-Sulti, Mojtaba Ghodsi and Payam Soltani
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Morteza Mohammadzaheri: Engineering Department, Birmingham City University, Birmingham B4 7XG, UK
Sami Al-Sulti: Ministry of Housing and Urban Planning, Muscat 512, Oman
Mojtaba Ghodsi: School of Energy and Electronic Engineering, University of Portsmouth, Portsmouth PO1 3DJ, UK
Payam Soltani: Engineering Department, Birmingham City University, Birmingham B4 7XG, UK

Energies, 2023, vol. 16, issue 10, 1-17

Abstract: This article first reviews the position control of piezoelectric actuators, particularly charge-based sensorless control systems, which often include a charge estimator as a key component. The rest of the paper is about charge estimators for piezoelectric actuators. Two of the most recent/effective types of these estimators utilise either a sensing capacitor (type I in this paper) or a sensing resistor (type II); the latter (and the newer) type is broadly known as a digital charge estimator. Some experimental results in the literature show that, with the same loss in excitation voltage, a considerably higher amount of charge can be estimated with a type II estimator in comparison with a type I estimator; therefore, the superiority of type II estimators was acknowledged. In order to re-assess this conclusion, this paper equitably compares type I and II estimators through analytical modelling and experimentation. The results indicate that type II estimators have only a slight advantage in estimating higher amounts of charge, if both type I and II estimators are designed appropriately. At the same time, type II estimators have disadvantages; e.g., the resistance of type II estimators has to be tuned to suit different excitation frequencies. This research concludes that capacitor-based (type I) charge estimators for piezoelectric actuators, with pertinent design and implementation, can be still the prime solution for many charge estimation problems despite claims in the literature in the last decade.

Keywords: piezoelectric; charge; actuator; capacitor; digital; resistor; nanopositioning (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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