Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 319
here is along pull up followed by a long coast down. When on the up-grade, the motor runs at about 4 per cent, less than synchronousspeed, at which speed the rotor slips fast enough through therevolving field to cause full-load current to flow. Starting on the down grade, the car begins to drive… … Fig. 348.—The rotor of a self-starting synchronous motor. ping through the revolving field. But since it is now runningfaster than the field, the direction of motion of the conductorsrelative to the field has been reversed, and the torque which wasa driving torque now becomes a retarding torque so…
Electrical engineering
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