Permanent magnet synchronous motor adaptive fractional order Fast terminal sliding mode control

The system buffeting in traditional sliding mode speed control of permanent magnet synchronous motor is large and the control accuracy is easily affected by load disturbance. An adaptive fractional-order fast terminal sliding mode control strategy based on barrier function is proposed. Firstly, fractional order fast terminal sliding mode surface is introduced on the basis of traditional integral sliding mode to reduce system buffeting and ensure tracking error convergence in finite time. At the same time, an adaptive control law based on barrier function is designed to offset the uncertain effects of external disturbances and improve the robustness of the system. And the method does not need to design additional interference observer to observe the load torque change. Finally, the simulation results show that compared with the traditional SMC and PI control methods, the controller in this paper can adjust the step response time more than 0.037s faster, the speed fluctuation is lower than 65rpm/min when the load torque changes, and the control accuracy can reach 0.02rpm/min. The control precision and anti-interference ability of the proposed method have been proved effectively.