Permanent magnet linear motor position control based on model reference adaptive control

SHI Weimin1,2, OUYANGBo1,2, YANG Liangliang1,2, SHI Jun1,2

(1.Zhejiang Provincial Key Lab of Modern Textile Machinery & Technology, Zhejiang SciTech University,
Hangzhou 310018, China;2.The Research Center of Modern Textile Machinery Technology of The
Ministry of Education, Zhejiang SciTech University, Hangzhou 310018, China)

Abstract: Aiming at strongly nonlinear and timevariant characteristics of the permanent magnet linear motor (PMLSM), model reference adaptive control methods are applied to design closedloop position controllers for the SISO nonlinear PMLSM system. A simplified mathematical model of PMLSM was established by using dipole cancellation method and PMLSM position secondorder adaptive controller was forward, which based on local parameter optimization MIT method (gradient) and global stability theory Lyapunov scheme. Then the stability of the permanent magnet linear motor closedloop system under the adaptive controller was analyzed. Under the same feedforward and feedback controller, the results indicate that the secondorder controller based on Laypunov second method is better than the controller in the MIT method and respond rapidly and track perfectly the input thirdorder point trajectory signal, which confirmed the validity of position adaptive control on the PMLSM.

Key words: model reference adaptive control(MRAC); permanent magnet linear motor position control; MIT; Lyapunov