International Library of Technology · Scranton, International Textbook Co. · leaf 348
t cars and will serve as agood introduction to the study of them. The controller 24 ELECTRIC RAILWAYS. 19 shown in Fig. 13 is designed to handle one 50-horsepower500-volt motor or one 25-horsepower 220-volt motor, i. e.,its contacts are large enough to handle about 75 amperes.The figure shows the… … Fig. 13.Companys controllers, a magnetic field is used to extin-guish the arc that would otherwise form at the contact tipsand cause blistering and burning. This method of pre-venting arcing has proved very effective. B is the coil thatsets up the magnetic field necessary to blow out the arc, andis…
Electrical engineering
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