Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 316
s per cent, of the relative velocity at standstill. As the load on the motor increases, the motor slows down andthe rotor slips more rapidly through the revolving field and causesthe rotor current to increase, but the frequency of the rotor cur-rent increases as well as its numerical value and this… … 200 400 600 800 1000 1200 1400K-.P.M. Starting current = 160 amp. = 5 times full load currentStarting torque = 1.9 times full load torqueMaximum torque =3.1 times full load torque Fig. 343.—The relation between torque, current and speed in a 25 h.p.,440 volt, 3-phase, 60 cjTcle induction motor.…
Electrical engineering
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