Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 230
lds are energized by a small fraction of the current, whichpasses directly from brush to brush through many turns offine wire in the field coils, while the maincurrent does the work in the externalcircuit (Fig. 271) the dynamo is shunt-wound. This type is used where theoutput of current required is… … Fio. 271.—Shunt-wounddynamo. The field-magnets, of course, losetheir strength when the current ceasesto flow, but the cores contain sufficient residual magnetism tocause the machine to develop sufficient current to pick up on the start. 264. The Electric Motor. The purpose of the electricmotor is…
Physics
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