Interior Permanent Magnet Synchronous Traction Motor for Electric Vehicle (EV) Application over Wide Speed Range.

Nowadays, electric vehicles (EVs) powered by battery are becoming popular green alternative to traditional internal combustion engines (ICE). High starting torque at lower speeds and high power at higher speed with wide speed range in constant power region is desired for EV motor operation. This paper proposes the simulation model for interior permanent magnet synchronous motor (IPMSM) developed for electric vehicle (EV) traction application with maximum torque per ampere (MTPA) and flux weakening (FW) control approach using MATLAB/Simulink. Electrical vehicle market is increasing rapidly and IPMSM is considered to be most suitable motor for this application due to its high torque to current ratio, high power density and higher efficiency. Modelling of IPMSM in Simulink using the mathematical equations in d-q reference frame is created. The simulation of IPMSM with controlling strategies as MTPA control for below base speed and FW control beyond rated speed is implemented and a robust dynamic response is achieved. Here feedforward flux weakening control method is used which generates larger torque in high-speed region and provides wider constant power region. The speed response below and above the rated speed is developed and studied by observing the simulation results. This developed model will help in selecting the better IPMSM parameters for specific vehicle application according to the drive cycle.