Postfault Operation of an Asymmetrical Six-Phase Induction Machine With Single and Two Isolated Neutral Points

The paper presents a study of post-fault control for an asymmetrical six-phase induction machine with single and two isolated neutral points, during single open-phase fault.Postfault control is based on the normal decoupling (Clarke) transformation, so that reconfiguration of the controller is minimised.Effect of the single open-phase fault on the machine equations under this control structure is discussed.Different modes of post-fault operation are analysed and are further compared in terms of the achievable torque and stator winding losses.Validity of the analysis is verified using experimental results obtained from a six-phase induction motor drive prototype.