Electrical machinery; a practical study course on installation, operation and maintenance (1921)
Annett, Fred Anzley · New York [etc.] McGraw-Hill book company · leaf 205
ELECTRICAL MACHINERY Reversing Rotation of Armature.—If the armaturesdirection of rotation is reversed, as in Fig. 201, then the field-coil connections to the armature have to be reversed before themachine can build up. Assume the same polarity for theresidual magnetism as in Fig. 195; then, since… … Fig.200 Fig. 201 Fig. 200.—Same as Fig. 19S; residual magnetism reversed.Fig. 201.—Same as Fig. 195; with direction of armature reversed. the field coils in a direction as shown, which gives the coils apolarity A and *S^ which is opposite to that of the residualflux, and the generator cannot build…
Electric machinery
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