Modified Direct Torque Control of PMSM Drive for Electric Vehicle Application

In majority of transportation fossil fueled vehicles equipped with Internal Combustion (IC) engine are used. But owing to environmental concerns, IC engines are not recommended. Therefore, the alternative is stated to be Electric Vehicles (EVs), which are efficient, environmental friendly without any toxic emissions and also facilitates silent operation. EVs have become a great attraction in the field of automotive traction motors. The motor in EVs should have features like high efficiency, high torque/weight and power density. These features are attained with the application of Permanent Magnet Synchronous Motor (PMSM). In this research work, PMSM drive is considered for EV application. To gain high dynamic performance of PMSM drive, Direct Torque Control (DTC) is applied. Thus, DTC operated PMSM drive is investigated for various control operations in EV application. In conventional DTC, high ripples in torque response are observed due to reverse Voltage Vector (VV) selection from look-up table. With the proposed DTC, problem of high torque ripple is addressed by replacing reverse VV with null VV selection in modified lookup table. Thus, torque ripple reduction in proposed DTC consequences smooth performance of PMSM drive in EV application. This can be verified in simulation platform using Matlab/Simulink software.