ACTUATOR ASSEMBLIES COMPRISING PIEZO ACTUATORS OR ELECTROSTRICTIVE ACTUATORS

摘要

The invention relates to an actuator assembly comprising a first piezo actuator and a second piezo actuator. According to a first aspect the piezo actuator comprises a correction unit, configured to determine an output voltage difference representing a difference between a voltage at the output terminal of the first piezo actuator and a voltage at the output terminal of the second piezo actuator, and a first power correction for correcting the first power signal and/or a second power correction for correcting the second power signal, based on the output voltage difference. According to a second aspect a power unit, said power unit configured to generate a power signal for the first and second piezo actuator based on the set point, and to provide the power signal to the first terminal of the first piezo actuator and to the second terminal of the second piezo actuator.