RCM for DC Motors

We conduct the RCM analysis with your electrical and mechanical maintenance teams, defining DC motor functions (deliver variable speed torque output, commutate armature current without destructive sparking, contain rotating hazards, reject heat). Failure modes are documented for each subsystem: commutator (bar-to-bar short from carbon bridging, surface roughening, out-of-round), brushes (wear, chipping, selective action), armature winding (turn-to-turn insulation failure, ground fault, banding failure), field winding (insulation degradation, shunt field open circuit), interpole circuit (air gap change, winding fault), and bearings. The JA1011 logic tree classifies each mode: commutator surface inspection as an on-condition task with defined acceptance criteria, brush length measurement as a scheduled restoration trigger, surge testing for armature winding condition, insulation resistance testing for field windings, and interpole gap verification as a condition task during planned outages. Failure-finding tasks are assigned to protective devices (overcurrent, overspeed, field loss). Task intervals reflect P-F intervals specific to DC motor failure progression rates.