Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 218
line, should nottake more than 2J^ to 3 times the normal current. 2,872 HAWKINS ELECTRICITY Ques. What type of alternating current motor issuitable for elevators of higher speed? Ans. Polyphase slip ring or external resistance motors. This type of motor has a high starting torque and suitable… … Pig. 4,135.—Diagram of Otis mechanical reversing control with type B reversing switch. With this type of motor and the proper controlling device it is possibleto secure a smooth start and to maintain a constant speed under varyingloads. The polyphase, slip ring motor will not run away under…
Electrical engineering
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