STATOR FAULT DETECTION AND DIAGNOSIS

摘要

A method of detecting a stator fault in a multi-phase current induction machine comprises the steps of:
obtaining (S203) a respective frequency spectrum for each of the current phases in the induction machine;
deriving (S204), from each frequency spectrum, a value for the ITHD (Inverse current Total Harmonic Distortion) for the respective current phase;
calculating (S205) an ITHD deviation value corresponding to the maximum deviation for the derived ITHD values ;
judging (S206) whether the calculated ITHD deviation value differs from a reference deviation value; and
determining (S206), in response to a positive judgement, that there is a stator fault.