Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 120
of the spider is not made continuous, but in several sections as shownin fig. 364. The rim here consists of four sections each of which has twodovetail notches. By thus dividing the rim into sections, its weightis somewhat reduced and the ventilating spaces between the sectionsincreased.… … Fig. 365.—Hub and shaft design on large machines to reduce the machine work and facil-itate erecting. Ques. Why do armature cores heat? Ans. They heat from these causes: eddy currents, hyster-esis, and heat generated in the inductors. Ques. How is adequate ventilation secured? Ans. The spider is…
Electrical engineering
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