Dynamo electric machinery; its design, construction, and operation; direct-current machines (1915)
Sheldon, Samuel, 1862-1920, Hausmann, Erich, 1886- joint author · New York, D. Van Nostrand Company; · leaf 235
d. Thissystem is extensively used in machine shops for drivinglathes, planers, and similar machines. MOTORS. 223 Speed control of shunt motors by varying the voltageimpressed upon the armature is also the principle of theWard Leonard system, which differs from the foregoingmultivoltage system in… … Fig. 137. of prime mover, S, or by an auxiliary shunt motor whichtakes current from the supply mains. An adjustable resist-ance in the generator field circuit regulates the voltagewhich is impressed upon the motor armature, M, from prac-tically zero to its maximum value. The field winding ofthe…
Electric machinery
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