Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 336
& Motor Current Fig. 366.—Vector diagram for a single-phase series motor. Since the armature is rotating in a magnetic field, a back e.m.f.is generated in the armature in the same way as in a direct-currentmotor, see page 79. This e.m.f., however, is alternating sinceit is produced by the…
Electrical engineering
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