Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 337
the current I through theself induction of the field coils E, the resultant of Ea and Ef, is the applied voltage cos a is the power factor of the motor. The lower the frequency of the supply, the smaller the valueof Ef) and the higher the speed of the motor, the larger thevalue of Ea, so that low…
Electrical engineering
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