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 145
core in machines of the usual type may betaken as 1.5 times the pole pitch, or i.^X^ inches. Theinductance of the free portion of an armature coil ofn turns would then be i/=(^^^^|^=6;,»^io-». (3) COMMUTATION. 133 Generally, two or more armature coils are simultaneouslyundergoing commutation, and… … Fig. 81. the positive brush, lies in the same slot with one coil-sideof the element short-circuited by the negative brush. Themutual inductance with such an arrangement is very nearlyequal to the inductance of the embedded portion of a coil.Thus little error will be introduced by taking double…
Electric machinery
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