Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 359
w w Fig. 396.—Hoisting periodFigs. 396 and 397. Fig. 397.—Lowering period, withdynamic braking.Connections of a compound-wound direct-currenthoist motor. Dynamic braking is also applied to crane motors. Duringhoisting, the motor is connected as shown in Fig. 398 On the firststep of the controller… … Fig. 398.—Hoisting. Fig. 399.—Lowering. Fig. 400.—Dynamic braking.Figs. 398 to 400.—Connection of a series-wound direct-current crane motor. When lowering, the machine is changed over to a shunt machineas shown in Fig. 399 and a resistance R is inserted to limit theflow of current in the field coil…
Electrical engineering
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