Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 69
y across the contact surface in lines persq. cm.A is the total pole face area in sq. cm. In the case of the magnet shown in Fig. 56, the scale on the iron to be liftedis assumed to be 0.05 cm. thick, it is required to determine how the pull varieswith the exciting current. To solve this problem it… … Cast Iron 1.0 2.0 3.0 Amperes Fig. 56.—Pull of a horseshoe magnet. h, the length of the cast steel path = 20 cm.h, the length of each air gap = 0.05 cm.h, the length of the cast iron path = 12 cm.Ai, the cross section of the cast steel path = 2 X 4 = 8 sq. cm.A2, the cross section of each air path…
Electrical engineering
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