Design of a speed controller for permanent magnet synchronous motor in pure electric vehicle applications

In this study, a robust adaptive backstepping controller will be proposed for the speed control of permanent magnet synchronous motors (PMSM) in using pure electrical vehicles (PEV). A general electric drive train of PEV is conceptually rearrange to major subsystems as electric propulsion, energy source, and auxiliary subsystem and the load torque is modeled by considering the aerodynamic, rolling resistance and grading resistance. Stator resistance, damping coefficient, load torque are considered as uncertainties and noise generated at applying load torque to motor is also considered. It shows that the backstepping algorithm can be used to solve the problems of nonlinear system very well and robust controller can be designed without the variation of adaptive law. Simulation and experiment results are provided to demonstrate the effectiveness of the proposed controller.