Fast Integral Terminal Sliding Mode Control of PMSM Based on New Sliding Mode Reaching Law

For the purpose of improving the dynamic quality of Permanent Magnet Synchronous Motor (PMSM) control system, a control method combining Fast Integral Terminal Sliding Mode Controller (FITSMC) and Sliding Mode Disturbance Observer (SMDO) is proposed. Firstly, to make the speed error converge faster, a fast integral terminal sliding mode surface is proposed, which can overcome the problem that the integral sliding mode surface cannot converge in finite time and the singularity of terminal sliding mode surface. Secondly, a New Sliding Mode Reaching Law (NSMRL) is developed which can shorten the response time and improve the dynamic characteristics of PMSM control system. In addition, the SMDO is established to observe and compensate the load disturbance. Finally, Integral Sliding Mode Controller (ISMC) and FITSMC are applied to PMSM control system respectively. The simulation results show that FITSMC makes the robustness and dynamic response of the system stronger and faster.