| 摘要 |
A method of detecting a stator fault in a multi-phase current induction machine comprises the steps of measuring current values for each phase of the poly-phase machine S202, obtaining a respective frequency spectrum for each of the current phases S203, deriving from each frequency spectrum a value for the ITHD (Inverse current Total Harmonic Distortion) for each current phase S204, calculating a single ITHD deviation value corresponding to the difference between the maximum and minimum derived ITHD values S205, judging whether the calculated ITHD deviation value differs from a reference deviation value, possibly by an amount greater than a threshold amount, and determining, in response to a positive judgement, that there is a stator fault S206. The method may further determine whether the stator fault is a voltage unbalance or a stator winding fault, depending on whether the ITHD deviation value is higher or lower than the reference value. |
