Speed Control of Quadratic Boost Converter Coupled Inverter fed PMSM for Electric Vehicle

Abstract

Permanent magnet motors are considered as the best candidate for the electric vehicle application as they have a higher torque density and efficiency compared to other motors. This paper presents the speed control of a three-phase Permanent Magnet Synchronous Motor (PMSM) for Electric Vehicles (EVs) which is fed through a quadratic boost DC-DC converter (QBC). The battery voltage of 48 V is boosted to 96 V by the QBC at the inverter DC link. Dynamic modeling of the converter is carried out to predict the dynamic behavior of the QBC feeding the inverter coupled PMSM. A comparison of the designed motors operating at 48 V and 96 V was carried out, to see the effect of boosting the input voltage. This paper also presents the dynamic modeling and analysis of the designed 3- phase, 5 HP, 96 V PMSM. Initial sizing and design for the selected power range are done using conventional methods. The electromagnetic analysis is done using the ANSYS Maxwell <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">®</sup> for the accurate performance prediction. Speed control of PMSM is done using the field-oriented control in MATLAB Simulink at different loading conditions.