Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 89
as shown in diagram E, thecurrent in coil M tries to increase suddenly from zero to a value7, but this change of current is opposed by the self induction ofthe coil M, so that the current prefers to pass to the brush acrossthe air space x, causing sparking. 72. Shifting of the Brushes.—For… … Fig. 88. Fig. 89. Fig. 90. Fig. 88.—With low resistance brushes on neutral line.Fig. 89.—With low resistance brushes shifted in the direction of motion.Fig. 90.—With high resistance brushes. Stages in the process of commutation. Art. 73] THEORY OF COMMUTATION 65 site direction during the time the…
Electrical engineering
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