NONLINEAR HYSTERESIS MODEL AND CONTROL OF MAGNETOSTRICTIVE MICROPOSITIONER

TANG Zhifeng  LÜ Fuzai  XIANG Zhanqin

(Modern Manufacture Engineering Institute, Zhejiang University, Hangzhou 310027 )

Abstract: Aiming at the non-linearity and hysteresis of giant magnetostrictive actuator (GMA), two numerical realization of Preisach model by density function method (DFM) and F fuction method (FFM) are present. Experiment and simulation show that FFM is better than DFM over predict precision of hysteresis loops. To make the Preisach numerical model in application to practical control of GMA, a real-time numerical compensation algorithm for preisach model is pointed out, and a PID plus Preisach feedforward compensation (PFC) control model is build up, open-loop, general PID and PID plus PFC are independently applied to GMA for the position tracking and trajectory tracking. Experiment results reveal that PID plus PFC has faster response, higher precision of position tracking and trajectory tracking than open-loop and general PID, 3 µm position tracking error and 2 µm trajectory tracking error in the range of 100 µm can be attained by PID plus PFC.

Key words: Magnetostrictive Hysteresis Control

CLC No: TH113.1 TH161.6

中国博士后科学基金(20060390337)和国家自然科学基金(50105019)资助项目. Received 20060724, received in revised form 20070116