International Library of Technology · Scranton, International Textbook Co. · leaf 159
-railway system is maintained approximately constantat 500 volts. Crane and hoist motors are usually operatedat pressures of 110, 220, or 500 volts. Series motors areoperated to a limited extent on constant-current arc-lightcircuits, but the number so operated is insignificant com-pared with those… … F Fig. 1416. mains, as shown. The pressure between the mains is main-tained constant. We will denote this constant line pressureby E. We must have, then, the following relation: E^ £,,,-{-CR,,+ CR„ (607.) where E^^ is the counter E. M. F. of the motor, C thecurrent corresponding to any given load,…
Electrical engineering
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