A new robust model based sensorless control for six phase induction machines

This paper proposes a new scheme for robust sensorless vector control of six phase induction motor. The method is based on the model current estimation, in which the controlled stator voltage is applied to the six phase induction motor so that the difference between stator currents of the mathematical model and the motor can be forced to decay to zero. To make a better dynamic response and to reduce the steady state error, conventional PI controller is replaced by a non-linear scale controller. Also, fuzzy logic controller has been used to estimate synchronous speed accurately. An effective online parameter estimation is used to identify both stator and rotor resistances for preventing uncertaiting due to parameter variations. The performance of the method is verified through simulation.