DETECTION OF COMMUTATION DEFECTS

摘要

A signal is derived corresponding to variations in the unidirectional current flowing in the external power lines to a direct current rotating machine. A second signal is derived from the first signal having a period equal to the period of revolution of a commutator divided by the number of commutator segments. The appearance in the second signal of peaks short in duration in relation to said period indicates a defect in commutation of current in the armature winding of the direct current machine.