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
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 … Fig. 38. of the ducts varying from three-eighths to five-eighths ofan inch. Fig. 39 illustrates a Westinghouse armature core partlyassembled on the spider. One of the segments of a disc 72 DYNAMO ELECTRIC MACHINERY. and a spacing piece are shown leaning against thatportion of the spider upon which…
Electric machinery
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