PMSM Position Control Based on Composite Nonsingular Fast Terminal Sliding Mode Algorithm
A composite control strategy combining nonsingular fast terminal sliding mode control(NFTSMC)and disturbance observer was proposed to address the low position tracking accuracy and poor robustness of permanent magnet synchronous motor(PMSM)position control systems under various uncertainties such as parameter perturbations and load disturbances.Firstly,NFTSMC adopted a nonlinear sliding mode surface with global fast convergence characteristics,and designed a position controller with continuous sliding mode control rate.Its stability was proved through Lyapunov theorem.Then,in order to further improve the ro-bustness of the permanent magnet synchronous motor position control system,an extended state observer was introduced to accurately estimate the system's lumped disturbance and perform feedforward compensation on the controller.Finally,simulation and experimental results showed that compared with traditional sliding mode control,the proposed composite sliding mode control strategy had faster dynamic response,higher tracking accuracy,and stronger robustness.
permanent magnet synchronous motor(PMSM)position controlnonsingular fast terminal sliding mode controller(NFTSMC)extended state observer(ESO)
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