Modeling and Control of Precision Actuators

3

Identification and Compensation of Preisach Hysteresis in Piezoelectric Actuators

Hysteresis contributes to the main uncertainty, which affects the control performance, among the nonlinearities present in piezoelectric actuation systems. In the open loop, the maximum error from hysteresis is 10–15% of the total displacement of piezoelectric actuators (PAs) [1]. This error may not be tolerable for precision applications. The modeling and identification of the hysteresis nonlinearity in PAs can enhance the control performance and the identification accuracy of nonhysteretic dynamics at higher frequencies. Currently, to avoid the hysteresis effect, only 5% of the travel range of PAs is used to identify the transfer functions [2]. Moreover, ...