Abstract
Abstract Electric vehicles (EVs) are considered as a new generation of transport to solve the energy crisis. The efficiency of permanent-magnet synchronous machine (PMSM) is an important performance for the energy loss of EVs. Considering the harmonic current caused by the PWM output voltage of inverter, this paper proposes a novel global loss model of PMSM, which can calculate both fundamental loss and harmonic loss. This model precisely estimates the harmonic loss of PMSM by double Fourier integral analysis. Based on the proposed loss model, a maximum efficiency control strategy is presented which can achieve the minimum energy loss in the whole operation range of EVs. The optimum flux-weakening current can be quickly found by the maximum efficiency control, and optimization of energy loss in PMSM direct drive system is verified by theoretical analysis and experimental results.
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