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 239
If now, be-cause of low voltage,the current in the fieldwinding and magnetbecomes low, the mag-net is no longer able toretain the handle, andthe spring throws it tothe off position,where it stays until themotor is again turnedon by an attendant.The overload coil is ^^^- *°* connected in series with… … 228 DYNAMO ELECTRIC MACHINERY. to the off position. This panel is provided with a mainswitch and enclosed fuses, although the latter are fre-quently replaced by circuit breakers. A combined starting and field-regulating rheostat madeby the Cutler-Hammer Manufacturing Company is shown in Fig. 141.…
Electric machinery
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