Improved Loss Minimization Control Strategy of Permanent Magnet Synchronous Motor Considering Harmonic Loss

Abstract

For the problem of additional copper loss, iron loss, and efficiency degradation caused by current harmonics in surface-mounted permanent magnet synchronous motor (SPMSM), this study proposes a novel optimization strategy based on harmonic current and the conventional loss minimization control (LMC) strategy, namely Harmonic-Current-Inclusive Loss Minimization Control (HCI-LMC). For the 5th, 7th, and 11th current components, a compensatory harmonic voltage injection scheme is adopted for suppression. Simulation studies are conducted to verify the effectiveness of the proposed optimization strategy. The total harmonic distortion (THD) of the stator current is reduced from 14.87% to 1.36%, and the amplitudes of the 5th, 7th, and 11th harmonics are attenuated by 82.6%, 80.0%, and 79.3%, respectively. The results indicate that HCI-LMC can significantly suppress harmonic losses and improve the overall motor efficiency by 1.32% compared with the conventional LMC strategy.