Integral non-singular terminal sliding mode PMSM sensorless control system
In order to solve the problem of low estimation accuracy and strong chattering of the traditional sliding mode observer at medium and high speeds of permanent magnet synchronous motors,a vector con-trol method of PMSM based on an improved sliding mode observer was proposed.Based on the theoretical analysis of the nonlinear sliding mode surface,in the method an integral non-singular terminal sliding mode surface was constructed,which effectively reduces chattering phenomenon and improves the obser-vation accuracy of the system.An adaptive back electromotive force filter was designed to make the back electromotive force adjust adaptively with the observer,and its harmonic content is low,which further im-proves the dynamic accuracy.Finally,the rotor position information of the motor was modulated using the principle of quadrature phase-locked loop,and the proposed novel control method was applied to the speed control system of the permanent magnet synchronous motor to compare it with the traditional sliding mode control.Simulations and experiments show that the proposed permanent magnet synchronous motor control system based on a new sliding mode observer has high tracking accuracy,strong robustness,fast convergence speed and good dynamic and static responses.
back EMF filterpermanent magnet synchronous motor(PMSM)sensorless controlsliding mode observerspeed control system
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