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 121
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… … is divided into several sectionswith intervening air spaces D asshown in fig. 363, the discs beingkept apart at these points by dis-tance pieces. These openingsbetween the discs are called vent-ilating ducts; they are usuallyspaced from 2 to 4 inches apart. Ques. What other provis-ion is sometimes…
Electrical engineering
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