Stator winding diagnostic systems and methods

摘要

Systems and methods are provided for diagnosing stator windings in an electric motor. An exemplary method for diagnosing stator windings in an electric motor involves determining an input energy imbalance across phases of the stator windings for an electrical period of the electric motor and identifying a fault condition when the input energy imbalance is greater than a first threshold value. In some embodiments, an input energy ratio across phases of the stator windings is also determined for the electrical period, wherein the fault condition is identified as a phase-to-phase short circuit fault condition when the input energy ratio is greater than a second threshold value and the input energy imbalance is greater than the first threshold value, or alternatively, as an in-phase short circuit fault condition when the input energy ratio is less than the second threshold value.

主权项

1. A method for diagnosing stator windings in an electric motor, the method comprising:
determining, by a control module coupled to a first module coupled between the electric motor and an energy source, an input energy difference between a first phase of the stator windings and a second phase of the stator windings for an electrical period of the electric motor; determining, by the control module, an input energy ratio for the first phase with respect to the second phase for the electrical period when the input energy difference is greater than a first threshold value; and identifying, by the control module, a phase-to-phase short circuit fault condition when the input energy ratio is greater than a second threshold value.