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Disturbance-Observer-Based Hysteresis Compensation for Piezoelectric Actuators

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3 Author(s)
Jingang Yi ; Dept. of Mech. & Aerosp. Eng., Rutgers Univ., Piscataway, NJ, USA ; Steven Chang ; Yantao Shen

We present a novel hysteresis compensation method for piezoelectric actuators. We consider the hysteresis nonlinearity of the actuator as a disturbance over a linear system. A disturbance observer (DOB) is then utilized to estimate and compensate for the hysteresis nonlinearity. In contrast to the existing inverse-model-based approach, the DOB-based hysteresis compensation does not rely on any particular hysteresis model, and therefore provides a simple and effective compensation mechanism. We design and fabricate a lead magnesium niobate-lead titanate (PMN-PT) piezoelectric actuator for microscale tip-based power sintering process. Experimental validation of the proposed hysteresis compensation is performed on the PMN-PT cantilever piezoelectric actuator. The experimental results demonstrate the effectiveness and efficiency of the approach.

Published in:

IEEE/ASME Transactions on Mechatronics  (Volume:14 ,  Issue: 4 )