Electrical machinery; a practical study course on installation, operation and maintenance (1921)
Annett, Fred Anzley · New York [etc.] McGraw-Hill book company · leaf 201
MACHINERY creased above that of the residual magnetism and result in anin voltage. In Fig. 195 the polarity of the residual magnetism isdenoted by N and S, which will, for the direction that thearmature is turning in, cause the right-hand brush to havepositive and the left-hand brush negative… … FiG. 195.—Shunt-tjpe generator. Fig. 196.—Series-type generator. ing through it, it will be found that the field coils will have aI)olarity as indicated by N and <S, which will be seen to be thesame as the residual magnetism in the i)olepieces. Conse-quently the current lluwing in the field…
Electric machinery
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