Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 152
res as shown indiagram A, Fig. 149, and is then gradually cut out as the motorscome up to speed. The torque required to start and accelerate a car is muchgreater than that required to keep the car in motion so that thecurrent I in the motor is large at starting and, if the motors are Art. 151] DRUM… … Fig. 150.—Street railway controller. During the first half of the starting period, the motors are con-nected in series, as shown in diagram B, so that the total linecurrent passes through both machines; when the starting re-sistance is all cut out, each motor has half of the normal voltage
Electrical engineering
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