Electrical machinery; a practical study course on installation, operation and maintenance (1921)
Annett, Fred Anzley · New York [etc.] McGraw-Hill book company · leaf 243
act 226 ELECT RICA L MA CHINERY with them. At the instant wheii this change occurs, the cur-rent in coils 1 and 3 is i-eversed and the N and S poles of thearmature are instantaneously transferred backward througha space equal to that occupied by One armature coil so that theyare again opposite the… … Fig. 244.—Same as 243, with armature moved one commutator segment. commutator action, and as a result armature poles are main-tained in a position at the brushes, as the armature rotates.Although rin<; armatures have been used in the foregoingdescription for tlic sake of clearness, the theories…
Electric machinery
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