Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 37, Issue 10, Pages 12463-12473Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2022.3172389
Keywords
Fault tolerant systems; Fault tolerance; Windings; Torque; Stator windings; Optimization; Rotors; Fault-tolerant strategy; multiphase machines; multiple open-phase fault; torque operation range (TOR)
Categories
Funding
- Natural Science Foundation of Zhejiang Province [LCZ19E070001]
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This paper introduces the dominant advantage and impact of fault-tolerant capability in multiphase drives. It proposes a unified fault-tolerant strategy that ensures the widest torque operation range while minimizing losses. The proposed strategy can be applied to symmetrical or asymmetrical multiphase machines with any number of phases.
Fault-tolerant capability is one of the dominant advantage of multiphase drives. In case of open-phase fault occurrence, the control strategy needs to be modified in order to maintain smooth operation, resulting in larger amplitude of the phase current. Consequently, the winding losses are increased in comparison with healthy operation. Also, the torque operation range (TOR) is reduced inevitably. This article proposed a unified fault-tolerant strategy that can ensure the widest TOR while minimizing losses. Compared with state-of-the-art literature, the execution of the fault-tolerant algorithm does not require any online or offline global optimization process. Instead, simple closed-form expressions are adopted, which could be considered a feasible simplification. Furthermore, the proposed strategy can be adopted for symmetrical or asymmetrical multiphase machines with any number of phases. Experimental results validate the effectiveness of the proposed fault-tolerant method.
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