Improved Model-free Sliding Mode Control of Interior Permanent Magnet Synchronous Motor Based on Nonlinear Disturbance Observer

In order to address the problem that the parameter perturbation of interior permanent magnet synchronous motor leads to model uncertainty and affects the system control performance, an improved model-free sliding mode control method for interior permanent magnet synchronous motor based on nonlinear disturbance observer is proposed. Firstly, a new hyperlocal model of IPMSM considering parameter perturbation is established. Secondly, a sliding mode controller is designed as a feedback controller in model-free control by using the improved sliding mode reaching law. Then a nonlinear disturbance observer is designed to observe and estimate the model-free Unknown complex items in the control. Finally, a simulation comparison experiment is carried out with the traditional model-free sliding mode control method. The simulation experiment results prove that the proposed method can effectively solve the problems of system parameter perturbation affecting the motor control performance, with the effectiveness and superiority of the proposed method verified.