Abstract: In order to reduce the dependence of the permanent magnet linear synchronous motor speed regulating system on the model and the influence of external disturbances on the control performance, a sliding mode control strategy of permanent magnet linear synchronous motor based on a novel ultra-local model is proposed. From the mathematical model of the permanent magnet linear synchronous motor with parameter perturbation in the rotation coordinate system, the novel ultra-local model of the speed loop which only uses the input and output data of the speed loop without any other parameters is established to weaken the dependence on the accurate model of the motor. Combined with sliding mode control, a sliding mode speed controller based on the novel ultra-local model is designed, and the stability of the controller is analyzed using Lyapunov stability theory. Considering the unknowns in the novel ultra-local model, an internal model control disturbance observer is designed to estimate the unknowns in the model and realize feedforward compensation which is to achieve real-time update of the novel ultra-local model. The comparison results of simulation and hardware-in-the-loop experimental results with the traditional PI control strategy have verified that the proposed method can improve the dynamic response performance and adaptability of the permanent magnet linear synchronous motor control system, and have strong robustness.