ModelSim/Simulink co-simulation of a sensorless control for PMSM drives based on I-F startup and EKF

A hybrid sensorless control system for the permanent magnet synchronous motor (PMSM) drives using I-f startup method then a smooth transition to EKF-based (Extended Kalman Filter) sensorless field oriented control (FOC) is proposed in this paper. The solution of I-f simple startup method is suitable for the low-speed sensorless control without initial rotor position estimation and machine parameters estimation. And EKF-based sensorless FOC is appropriate for the medium- and high-speed sensorless control. Therefore, combining the two approaches, the PMSM can be controlled from standstill to the high speed operation smoothly. In this paper, firstly, the mathematical modeling of PMSM is introduced. Also, the I-f startup method and the rotor position estimation algorithms of EKF are conducted. Secondly, a very high-speed IC hardware description language (VHDL) is presented to describe the behavior of the adopted estimation and control algorithm. Finally, to verify the correctness of the designed VHDL code of the adopted estimation and control algorithm, a co-simulation work is constructed by Simulink and ModelSim and some simulation results are demonstrated.