Abstract
Recently, multiphase induction machines are proposed to replace traditional three-phase drives in low-voltage large power applications with high fault-tolerance ability. This paper concentrates on their speed sensorless vector control algorithm of multiphase induction machine. A full-order adaptive observer is adopted to observe the rotor flux and rotor speed, and a harmonic suppression method combined with dead zone compensation is designed to improve the performance of the drive system in a wide speed range. Then a distributed control system and the modularized inverter phase legs are designed, which enable the proposed control algorithm to be easily extended to any m-phase induction machine. Finally, experimental results on both the five-phase and the nine-phase induction machines demonstrate that the proposed control algorithm has very good dynamic and static performance.
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