Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 118
he lower back e.m.f. required is obtainedat a lower speed. With constant applied voltage and a given amature currentthe speed may be increased by decreasing the flux per pole. Thismay be done as shown in Fig. 115 by shunting the series fieldwinding with a resistance so that, of the total current… … Fig. 114. Fig. 115. Fig. 116. Fig. 114—Insert resistance in the armature circuit to reduce the speed.Fig. 115.—Shunt the field coils to reduce the excitation and increase thespeed. Fig. 116—Short circuit part of the field winding to reduce the excitationand increase the speed. Methods of adjusting…
Electrical engineering
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