Abstract: The permanent magnet synchronous motor is a multi-variable, strong-coupled and nonlinear system. Based on the nonlinear dynamic mathematical model, input-output linearization and decoupling control are achieved by using precision linearization theory. The speed tracking control law is designed from this precision linearization model and the current regulator is designed by the sliding mode variable structure controller. These methods are simple and practical, and improve the celerity and accuracy of speed tracking. Simulation and experiment results indicate that this control strategy achieved ideal dynamic performance and satisfactory robustness.

Key words: permanent magnet synchronous motor, sliding mode variable structure, precision linearization, controller, decoupling control