Electrical engineer's pocket-book: a hand-book of useful data for electricians and electrical engineers (1901)
Foster, Horatio A. (Horatio Alvah), 1858-1913 · New York, D. Van Nostrand co.; London, E.& F.N. Spon, ltd. · leaf 327
e eddycurrents in the armature, the curve a, b, will curve upward somewhat at theupper end. It is thus seen how to measure core-loss, and friction and windage of adynamo; knowing this and the resistance of the various parts, the efficiencyis quickly calculated, thus Let W= core-loss -f- friction… … FOUCAUlT currents HYSTERESIS BOSH FRICTION Then considering the above as the only losses (i.e., neglecting rheo-stats, etc.), Vc EfficienCy = Vc+ItR + VRi+W This is the simplest method of getting the efficiency, but does not take in load losses «if anyshould exist. Anotnea test forefficiency. — It…
Electrical engineering
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