Torque Improvement by Third Harmonic Current Injection into Multi-phase Machines with High Saturation
نویسندگان
چکیده
One advantage of multi-phase machines is the possibility to use the third harmonic of the rotor flux for additional torque generation. This effect can be maximized for Permanent Magnet Synchronous Machines (PMSM) with a high third harmonic content in the magnet flux. This paper discusses the effects of third harmonic current injection (THCI) on a five-phase PMSM with a conventional magnet shape. It is shown in simulation and measurement that the torque improvement by THCI increases with the grade of saturation, but the phase shift of the third harmonic of the rotor flux linkage has to be considered. Index Terms – Torque improvement, dq-model, third harmonic, saturation, non-linear effects, PMSM
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