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 230
ted, a considerable change in resistanceis necessary materially to alter the field intensity. A largeexciting current is then required to increase the magneticflux, and this may occasion excessive heating of the fieldcoils. Again, if an attempt be made to reduce the fiux toa considerable extent by… … MOTORS. 219 armature reaction limits speed variation. A shunt motorof the usual type which operates at a speed of V rev. permin. when the iron of its magnetic circuit is near saturationwill operate satisfactorily at any speed up to say 2 Frevolu-tions per minute. Field rheostats are described in §…
Electric machinery
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