Dynamo electric machinery; its design, construction, and operation; direct-current machines (1915)
Sheldon, Samuel, 1862-1920, Hausmann, Erich, 1886- joint author · New York, D. Van Nostrand Company; · leaf 118
Fig 66. … Fig. 67. FIELD MAGNETS. I07 the shape of the conductor section. As a rule, from 40%to 70% of the total cross-sectional area of a field coil isoccupied by copper, the remainder being taken up byinsulation. The ratio of the total copper section to thegross section of the coil is called the space…
Electric machinery
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