Research On Advanced Control Techniques Of A Five-phase PMSM For Electric Vehicle Applications

During the last few decades, environmental impact of the petroleum-based transportation infrastructure, along with the peak oil, has led to renewed interest in an electric transportation infrastructure. This gave a push to development of electric and hybrid electric vehicle technology. Five-phase permanent magnet synchronous motor(PMSM) attracts a great attention from researchers, as attraction motor for electric vehicles(EV) due to its reliability and efficiency. In order to fully utilize its capabilities, an advanced speed and torque control technique is needed. In real EV applications multiphase drivers are subject to various disturbances which may come internally and externally. Focus of this work is on improvement of torque and speed control algorithm of a five-phase PMSM. Traditional linear controllers are not capable to cope with these disturbances as well as nonlinear ones. This research proposes an enchained PI controller for the current loop, and a sliding mode control(SMC) based controller with a disturbance observer for the speed control loop.The proposed enchained PI controller for the current loop has a showed smaller settling time of q-axis current, that of traditional PI controller without occurrence of the overshoot. The proposed SMC for the speed control loop has a simple and robust structure, in pair with disturbance observer it guarantees fast converge of real speed to the reference. There is no overshoot in the response and motor’s speed is kept stable even in the presence of certain load disturbances, which are inherent property for this type of application.To verify the proposed control algorithms a set of simulations and experiments were carried out. The experimental five-phase PMSM drive was realized based on FPGA/DSC high speed integrated circuits.