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 83
ventilating ducts in the core.The rotation of the armature causes air to pass in throughthe axial apertures, or spider openings, and out throughthe ventilating ducts as indicated by the arrows in Fig. 37.The ducts are formed by separating the laminations atintervals by the interposition of blocks… … Fig. 37. This type is commendable because it gives support to thearmature teeth. Good practice requires the provision of one ventilatingduct for every 2 to 4 inches of axial core length, the width
Electric machinery
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