PRESCRIBED PERFORMANCE BASED MODEL-FREE FRACTIONAL-ORDER SLIDING MODE CONTROL FOR PERMANENT MAGNET LINEAR SYNCHRONOUS MOTOR

In this paper, a prescribed performance based model-free fractional-order sli-ding mode control is proposed to improve the speed tracking capability and robustness of permanent magnet linear synchronous motor (PMLSM). Firstly, a dynamic model of PMLSM is established. Then a prescribed performance control is proposed to ensure that the tracking error is within the boundary of the prescribed performance function. On this basis, the ultra-local model of the speed loop is given according to the input and output of the PMLSM system. The extended state observer is established to estimate the internal and external total disturbance, and the speed loop controller is fed forward compensation. Finally, the feedback controller is designed as fractional-order sliding mode control to converge the system state to the origin point in a finite time and improve the system's robustness effectively. Simulation results and experiments in dSPACE demonstrate the advantages and effectiveness of the proposed controller.