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Recent Advances and Future Challenges in Energy Applications and Control of Piezoelectric Actuators

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Dear Colleagues,

Piezoelectric actuators, well-known for their compact size and high stiffness, convert electrical energy to mechanical energy. As a result, they generate both force and displacement. The control of a piezoelectric actuator may be categorised as displacement or force control based on the extent of the (blocking) force exerted on the actuator. In micro/nanopositioning, e.g., in scanning probe microscopy, cell manipulation and fine guidance systems, the force is tiny and neglected, and displacement/position control is the prominent task. On the other hand, in vibration control or force generation, force control is the major concern.

This Special Issue covers the current challenges in the control of piezoelectric actuators as well as their applications as piezoelectric motors, energy harvesters, etc.

Topics of interest for publication include, but are not limited to:

Displacement/position control of piezoelectric actuators;
Force control of piezoelectric actuators;
Vibration control with piezoelectric actuators;
Energy harvesting with piezoelectric materials;
Dual use of piezoelectric materials for actuation and sensing;
Displacement/position estimation of piezoelectric actuators with use of other signals;
Force estimation of piezoelectric actuators with use of other signals;
Charge control of piezoelectric actuators;
Piezoelectric motors;
Charge estimation of piezoelectric actuators;
Modelling of piezoelectric actuators and their behaviour (hysteresis, creep, etc.).

Dr. Morteza Mohammadzaheri
Dr. Mojtaba Ghodsi
Dr. Payam Soltani
Guest Editors

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Research

17 pages, 3832 KiB

Open AccessArticle

Charge Estimation of Piezoelectric Actuators: A Comparative Study

by Morteza Mohammadzaheri, Sami Al-Sulti, Mojtaba Ghodsi and Payam Soltani

Energies 2023, 16(10), 3982; https://doi.org/10.3390/en16103982 - 09 May 2023

Cited by 2 | Viewed by 1172

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. Full article

(This article belongs to the Special Issue Recent Advances and Future Challenges in Energy Applications and Control of Piezoelectric Actuators)

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17 pages, 5856 KiB

Open AccessArticle

Analysis of Cantilever Triple-Layer Piezoelectric Harvester (CTLPH): Non-Resonance Applications

by Mojtaba Ghodsi, Morteza Mohammadzaheri and Payam Soltani

Energies 2023, 16(7), 3129; https://doi.org/10.3390/en16073129 - 29 Mar 2023

Cited by 2 | Viewed by 1284

Abstract

In this research, a design guideline for a kinetic energy converter using a cantilever triple-layer piezoelectric harvester (CTLPH) for low-frequency applications is presented. By combining the constitutive and internal energy equations, the analytical equations for harvested voltage and power were developed. It was also found that frequency of motion, applied tip force, piezoelectric coefficients, geometrical dimensions, and mechanical properties of layers play significant roles in the performance of the harvester. Having characterised the voltage regulator module, LTC3588, the dependency of output voltage on both the storage and output capacitors of the LTC3588 was investigated. An experimental measurement using the optical method was carried out to determine the applied tip force. Furthermore, the performance of the CTLPH in low frequencies (<3.3 Hz) for various resistive loads was investigated. It was found that both excitation frequency and external resistance load are effective on the maximum generated power. The developed CTLPH shows the optimum power of 17.31

μ W

at the external resistance of 20 kΩ, which is highly appropriate for micropower devices with at least 3.2 Hz of kinetic vibration in their environment. Full article

(This article belongs to the Special Issue Recent Advances and Future Challenges in Energy Applications and Control of Piezoelectric Actuators)

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