Third-Harmonic Current Injection Control of Five-Phase Permanent-Magnet Synchronous Motor Based on Third-Harmonic Current Reference Online Identification

The ratio of torque to copper loss can be increased by injecting third-harmonic current into five-phase permanent-magnetic synchronous motor (PMSM). Accurate flux linkage information is indispensable in the process calculating reference corresponding maximum torque/copper ratio. In harsh working environments, will deviate from initial measured value, resulting deviation between and point. Therefore, a injection control strategy PMSM based on online identification proposed this paper. key transform steady-state voltage equations an equation containing only voltages currents. transformed has characteristic that it equal 0 when operates at Meanwhile, observer designed estimate using characteristic. Finally, applied PMSM. Compared with previous methods, simple, no need not affected change linkage. experimental results demonstrate robustness strategy.