Nonlinear gain non-singular fast terminal sliding mode control for permanent magnet synchronous motors
To address the challenges of system error non-convergence and buffeting-convergence incompat-ibility in traditional sliding mode control,a speed controller is proposed,combining non-singular fast ter-minal sliding mode control with a disturbance observer.By using a variable nonlinear function as a gain instead of a fixed gain in the sliding mode control strategy,the system response speed is improved while reducing system oscillation.To address the impact of torque disturbances on the system,a load torque disturbance observer is added and compensated into the q-axis current to further enhance the controller's ability to resist load disturbances.According to Lyapunov stability theory,the stability of the proposed new sliding mode controller has been proven.After simulation and experiments,it's been proven that the motor starts up quickly without overshooting and with minimal vibration.When sudden torque is applied,the speed fluctuation is minimal and the recovery time is faster.Compared to traditional methods,this improved variable gain control enhances dynamic performance,suppresses buffeting,and improves system robustness.
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维普
