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

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
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for the accurate performance prediction. Speed control of PMSM is done using the field-oriented control in MATLAB Simulink at different loading conditions.