Diagnosis apparatus for field winding type rotating electric machine and diagnosis method for field winding type rotating electric machine

摘要

The present invention relates to a diagnosis apparatus for a field winding type rotating electric machine. The diagnosis apparatus includes an internal power supply circuit having an open fault determination potential, and determines, on the basis of a measurement result of a voltage value of a circuit that includes the field winding in a fault diagnosis condition, that a disconnection has occurred in the circuit when the measurement result is within an open fault determination voltage range including the open fault determination potential, that a power fault has occurred in the circuit when the measurement result is within a power fault determination voltage range including the positive electrode potential, and that an earth fault has occurred in the circuit when the measurement result is within an earth fault determination voltage range including the negative electrode potential.