Energy Efficient and Transients Optimal IPMSM Drive for Electric Vehicles

An energy efficient and transients optimal control for Interior Permanent Magnet Synchronous Motors is introduced based on the concept of the combined Maximum Torque per Ampere (MTPA) and total electric Loss Minimisation (LM) control approaches. The nonlinear optimal implicit equation of the combined MTPA/LM method is derived in a new compact form, the same as for the conventional LM approach. Then it is very simply applied to activate the MTPA control during transients for fast dynamics and the LM control during steady states for maximum efficiency. Compared to the existing similar approaches, it allows smooth transition between the methods with smaller number of equations simplifying required control coding and reducing the control algorithm execution time. Analytical results are supported by simulations and experimental results.