The invention discloses a brushless
alternating current (AC) generator
failure diagnosis instrument, belongs to generator state monitoring and fault diagnosis equipment, and solves the problem that the conventional generator
failure diagnosis device cannot perform unified monitoring and concentrated diagnosis on early electrical failures of the generator. The
failure diagnosis instrument comprises a sensor group, a
signal conditioning circuit, a sampling circuit, a data processor and a man-
machine interaction unit, wherein the sensor group consists of three
voltage sensors and
four current sensors; the data processor loads a
stator winding interturn short-circuit module, a rotor winding interturn short-circuit module, an
exciter failure diagnosis module and a rotating
rectifier failure diagnosis module for performing failure detection and recognition
processing; and the man-
machine interaction unit outputs a result. The failure diagnosis instrument is suitable for a marine generator in a narrow space, and various invasive sensors are not required to be arranged in the generator; and various corresponding electrical failures can be automatically calculated and judged, and the failure diagnosis instrument has high real-time property, has universality on generators with different model numbers and can meet an online detection requirement.