Asymmetric three-phase operation of fault-tolerant inverters for increased output torque of electric machines

Konferenz: PCIM Europe 2019 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
07.05.2019 - 09.05.2019 in Nürnberg, Deutschland

Tagungsband: PCIM Europe 2019

Seiten: 8Sprache: EnglischTyp: PDF

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Haering, Johannes; Gleissner, Michael; Bakran, Mark-M. (University of Bayreuth, Department of Mechatronics, Centre of Energy Technology, Germany)

Some fault-tolerant inverters require the reduction of the maximum current of only one of their three phases after a single failure. Normally, the maximum phase current of the two healthy phases is also reduced in order to achieve a symmetric system. Nevertheless, the two healthy phases can still deliver a higher maximum output current and thus enable an asymmetric three-phase operation. The effects on the characteristics of an electric drive system are a higher medium output torque than in degraded symmetric operation, however with an additional torque ripple. Depending on the mechanical drive train, this ripple may be tolerated.