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 231
Field rheostats are described in § 77. In order to vary the speed of a shunt motor over a widerange by this method it is necessary to neutralize the effectof armature reaction. This neutralization is accomplishedby the provision of a reversing magnetic field obtained bythe insertion of auxiliary… … Fig. 134. flux from them is practically proportional to the armaturecurrent. The reactance voltage (§57) generated in a short-circuited armature coil due to its rotation in the main mag-netic field is also proportional to the current flowing in it.The M.M.F. of the interpoles is adjusted so that a…
Electric machinery
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