Electrical machinery; a practical study course on installation, operation and maintenance (1921)
Annett, Fred Anzley · New York [etc.] McGraw-Hill book company · leaf 244
gnetic poles, is extremely con- DIRECT-CURRENT MOTORS 227 venient and is a considerable aid in coming to a thoroughunderstaiuUng of the principles involved. Both Motor and Generator Action Present in all Dynamo-Electric Machines.—Having given an armature situated in amagnetic field as in a… … Fig. 245.—Indicates both motor and generator action in same direct-current machine. delivers mechanical power. In both the cases a number of con-ductors are carrying currents and they are moving across amagnetic field. The question then arises, what is the differencewhich causes the machine to act…
Electric machinery
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