Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 84
Fig. 82.—Separately excited Fig. 83.—Shunt excited machine. machine. 69. Excitation.—Permanent magnets are used as field polesfor small machines called magnetos; large machines are supplied 60 PRINCIPLES OF ELECTRICAL ENGINEERING [Chap, x with electromagnets the excitation of which can readily…
Electrical engineering
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