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Home > Science, Technology & Agriculture > Technology: general issues > Continuous-Current Dynamos in Theory and Practice; With Details of Methods and Formulae Used in Construction; A Practical Handbook for Designers, Manufacturers and Users
Continuous-Current Dynamos in Theory and Practice; With Details of Methods and Formulae Used in Construction; A Practical Handbook for Designers, Manufacturers and Users

Continuous-Current Dynamos in Theory and Practice; With Details of Methods and Formulae Used in Construction; A Practical Handbook for Designers, Manufacturers and Users


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1899 Excerpt: ... of wire for a loss of 13 volts: 254 x 82-1; x 2-24 .. s = = 72 2 square millimetres. 5 x 13 Diameter of bare wire = 9/6 mm. Diameter of insulated wire = io-6 mm. Verification.--For /3 = o-6, we should have, by equation (27), . i,55o. The existing value of N = 4oo. Ampere-turns of armature =?=-x-4? 4x2x2 Ampere-turns of field magnets = 41,8oo. Ampere-turns of field magnets-41,8oo Ampere-turns of armature 8,25o Losses.--(1) Loss in the iron, due to hysteresis: Volume of iron = 166, ooo cubic centimetres. Induction B = 14,8oo., i B1-6 = 14,1oo, if 17 = o, oo3. Number of alternations - = x-= 167. 6o Loss: 14,1oo x 167 x 166, ooo x io-7 = 3,92o watts. (2) Loss due to eddy currents (thickness of iron discs = o-o6 cm.): in armature core 16 (o-o6 x i6-7 x 14,8oo)s 166, ooo a-=----52----= 585 watts: Loss in the copper (estimated) = 1,17o watts. (3) Loss due to resistance of the armature circuit = 1o-4 x 33o = 3,44o watts. (4) Loss due to resistance of the field-magnet circuit = 13 x 33 = 4,29 watts. (5) Loss due to friction: 'A d Loss. Large bearing 2,56o kgrm. 11o mm. 4,33o watts Small, ri53o kgrm. 1oo mm. 2,36o, v Total 6,69o Recapitulation. Watts. (1) Hysteresis loss 3,92o (2) Loss in iron, due to Foucault currents 585 copper 1,17o (3) Loss due to resistance of armature... 3,44o.(4) exciting circuit 4,29o 5) Frictional losses 6,69o CHAPTER IV. Experimental Determination Of The Permeability' Of Iron. Hopkinson-s original apparatus for determining the permeability of samples of iron is described in all text-books of electricity. As, however, it is not well adapted to our practical needs, a modification will here be described. The sample of iron to be examined (which may be cast or wrought) has the for...


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Product Details
  • ISBN-13: 9781130595826
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 96
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 113059582X
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 186 gr


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Continuous-Current Dynamos in Theory and Practice; With Details of Methods and Formulae Used in Construction; A Practical Handbook for Designers, Manufacturers and Users
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