Abstract
As a novel nonlinear control, backstepping is applied to the position tracking controller design of PMSM servo system. The design rule of backstepping makes the system global ultimate asymptotical stabilization(GUAS). The controller not only makes the system GUAS, but also has a quick and accurate position tracking performance. The position tracking can be greatly affected by the change of load torque. To efficiently reduce the effect of the change of load torque, the system design can estimate the load torque and regulate the controller with real time. The design can make the change of load torque have very little disturbance caused due to the position tracking error. At last, Matlab is used to simulate the whole system to prove the efficiency and feasibility of system design.
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