Diagnostic device for field winding type rotary electric machine and diagnostic method for field winding type rotary electric machine

摘要

A field winding (4), an armature winding (3), and a DC power supply (2) serving as a power supply source for the field winding and the armature winding, and operates as an electric motor or a generator A diagnostic device for a field winding type rotary electric machine applied to a rotary electric machine, comprising: an internal power supply circuit (111) having a disconnection failure judgment potential defined as a value different from a positive electrode potential and a negative electrode potential of a DC power supply And based on the measurement result of the voltage value of the circuit including the field winding in the fault diagnosis state, when the measurement result is within the disconnection fault judgment voltage range including the disconnection fault judgment potential, if disconnection occurs in the circuit When the measurement result is within the short-circuit failure determination voltage range including the positive electrode potential, it is determined that a short-circuit failure has occurred in the circuit, and the measurement result is within the ground fault determination voltage range including the negative electrode potential , It is determined that a ground fault has occurred in the circuit.