Identifier: designof40kwindu00abry (find matches)
Title: Design of 40 K. W. inductor generator
Year: 1900 (1900s)
Authors: Abry, B. B
Subjects: Induction generators Theses
Publisher:
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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the ma.chine. The extrene diameter of the field coil being 17 inches,the circia!iferential length is TTd = 3.1416 X .17 - inchesThen since the width of the ceil ie V inches, the afea of thec^aindrical radiating surface is 5yy,8 >: 7 = 376.G squ^ire inchesTo this must be added ^^bout 30 square inches of radiatingsurface on each side of the coil, as provided for in the con-struction of the bobbin; this naKes a total of 376 + 6 0 - 436 sqiiare inches .Hence ?89 / 436 = ,66 watts lost por snuare inch of radiat-ing surface. With 4.1 airtperes flcuing through the coil,the watts lost per square inch is approximalel3 1. The rise in temperature of the coil, in degrees Centi- 1 grade, as given b:- the folloiving formula, is enual to 52 X loss in v/atts / cyl, surface of bobbin in square incheor 52 X 289 / 376 = 40° with an excitation current of 3.3 amperes. v;hen the currentis 4.1 amperes, the rise in temperature is about 53°C. 1 Pisher-Hinnen, Continuous Current rynamcs, p.407 j^l899 ) 65
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