Post-fault 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. Post-fault control is based on the normal decoupling 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.