The fine art of load testing d-c motors: They have survived all predictions that they were about to disappear and remain a significant minority of industrial drives

摘要

BLACK BAND" TESTING, SETTING THE neutral, checking interpole polarity, bar-to-bar testing-these and most other test procedures described in d-c machine literature are "diagnostic" (Figure 1). Their purpose is to search out defects-shorts and opens in the armature winding, improper field connections, or commutator problems.