Electrical machinery; a practical study course on installation, operation and maintenance (1921)
Annett, Fred Anzley · New York [etc.] McGraw-Hill book company · leaf 197
MACHINERY coil under commutation; that is, if the current is up throughthe plane of the paper, the voltage will have to be downwardto assist in changing the direction of the current. In the fig-ure all the conductors under the S pole have an electromotiveforce induced in them down through the plane… … ?iG. 193.—Same as Fig. 190; brushes shifted to improve commutation. opposite to the flow of tlie current in tlie coil. When thebrushes are properly located, tliey will be in a position wherethe oltage generated in the coil will be just sufficient torever-se the carrent ihiring /he period of…
Electric machinery
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