Post-fault operation of fault-tolerant inverters for PMSM drives
Paper i proceeding, 2005

This paper considers post-fault operation of permanent-magnet synchronous motor drives equipped with a fault-tolerant inverter. In post-fault mode, the faulted phase is isolated and the neutral point is connected either to an additional inverter leg or to the midpoint of the dc bus. Different methods of controlling the neutral point voltage are presented and compared. Furthermore, operation without a position sensor (i.e., sensorless control) is considered and a modification to an estimator previously reported in the literature is proposed in order to take into account the effect of the asymmetry introduced due to the isolation of the faulted phase in post-fault mode. Simulations and experimental results are provided to support the theory and demonstrate the practical impact of the modifications proposed.

Converter control


fault handling strategy

synchronous motor

sensorless control

permanent magnet motor


Oskar Wallmark

Chalmers, Energi och miljö, Elkraftteknik

Lennart Harnefors

Ola Carlson

Chalmers, Energi och miljö, Elkraftteknik

European Conference on Power Electronics and Applications

90-75815-08-5 (ISBN)


Elektroteknik och elektronik



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