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Continuous Current Dynamos in Theory and Practice with Details of Methods and Formulae Used in Construction

Continuous Current Dynamos in Theory and Practice with Details of Methods and Formulae Used in Construction


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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: ... we should have, by equation (27), N 6-37 x 7.5oo 1-6 830 x o-b The existing value of N = 400. Ampere-turns of armature 330x400 _ 8 4x2x2 Ampere-turns of field magnets = 41,800. Ampere-turns of field magnets _ 41,800 Ampere-turns of armature 8,250 5 (about). Losses.--(1) Loss in the iron, due to hysteresis: Volume of iron = 166,000 cubic centimetres. Induction B = 14,800. t B1-6 = 14,100, if tj = o-oo3. Number of alternations w = 3--= 167. 60 Loss: 14,100 x 167 x 166,000 x io-7 = 3,920 watts. (2) Loss due to eddy currents (thickness of iron discs = o-o6 cm.): Loss in armature core 16 (o-o6 x i6-7 x i4,8oo)2 166,000 Q, . =--12--" '--= 585 watts; Loss in the copper (estimated) = 1,170 watts. (3) Loss due to resistance of the armature circuit = 10-4 x 330 = 3,440 watts. (4) Loss due to resistance of the field-magnet circuit = x3 x 330 = 4,2go watts. (5) Loss due to friction: Z d Loss. Large bearing 2,560 kgrm. no mm. 4,330 watts Small, i530 kgrm. 100 mm. 2,360, Total 6,690, Recapitulation. Watts. (1) Hysteresis loss 3,920 (2) Loss in iron, due to Foucault currents 585 copper 1,170 (3) Loss due to resistance of armature... 3,440 (4),, exciting circuit 4,290 5) Frictional losses 6,690 Total loss 20,095 Energy utilised = 330 x 600 = 198,000 Total energy 218,095 Efficiency = = qi per cent. y 218,095 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 form indicated in Fig. 1o3. To ensure exact measuremen...


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Product Details
  • ISBN-13: 9781130034967
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 94
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 1130034968
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 181 gr

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