Electricity experimentally and practically applied; a book for the beginner and for the practical man, principles, experiments, practical applications and problems (1910)
Ashe, Sydney Whitmore · New York, D. Van Nostrand company · leaf 188
thefield rheostat in series with the field coils of the motor. Vary the resist-ance, and note the change in speed. Note. Never start up a motor without being sure that the fieldrheostat handle is at zero or that all of the resistance is out of the cir-cuit, otherwise the motor will accelerate too… … Fig, 229. — Self-contained Rheostat (G. E, Co.) Take care not to open the field circuit of a motor while operating, asthe motor armature may run away, for with almost a zero field itwould require an infinite speed to generate sufficient counter e.m.f, tolimit the armature current. For small size…
Electricity · Electrical engineering
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