Armature Winding and Motor Repair

Front Cover
Mc Graw-hill, 1920 - Armatures - 515 pages
1 Review
 

What people are saying - Write a review

User Review - Flag as inappropriate

Would u give winding diagrams photos

Other editions - View all

Common terms and phrases

Popular passages

Page 492 - Multiply the diameter of the driver by number of its revolutions, and divide the product by the diameter of the driven, the quotient will be the number of revolutions of the driven.
Page 469 - ... or more of the power delivered. At lower frequencies, however, the constants are reasonably correct even under such extreme conditions. They represent about the true values at 10 per cent. line loss, are close enough at all losses less than 10 per cent., and often, at least for frequencies up to 40 cycles, close enough for even much larger losses.
Page 470 - E is the potential at the delivery end of the line and not at the generator. When the power factor cannot be more accurately determined, it may be assumed to be as follows for any alternating system operating under average conditions: Incandescent lighting and synchronous motors, 95 per cent; lighting and induction motors together...
Page 493 - RULE : Multiply the diameter of the driver by its number of revolutions and divide the product by the number of revolutions of the driven ; the quotient will be its diameter.
Page 469 - The figures given are for wires 18 inches apart, and are sufficiently accurate for all practical purposes provided that the displacement in phase between current and emf at the receiving end is not very much greater than that at the generator; in other words, provided that the reactance of the line is not excessive, or the line loss unusually high. For example, the constants should not be applied at 125 cycles if the largest conductors are used and the loss 20% or more of the power delivered. At...
Page 498 - Solidity Cube of the radius of a sphere x 4.1888 = Solidity Cube of the circumference of a sphere x 0.016887 = Solidity Square root of the surface of a sphere x 0.56419 = Diameter Square root of the surface of a sphere x 1.772454 = Circumference Cube root of the solidity of a sphere x...
Page 470 - ... for either of the outside wires. In both continuous and alternating-current systems, the neutral conductor for secondary mains and house wiring should be taken as large as the other conductors. " The three wires of a three-phase circuit and the four wires of a two-phase circuit should all be made the same size, and each conductor should be of the cross-section given by the first formula".
Page 466 - Birmingham Gauge (BWG) = Stubs, Old English Standard and Iron Wire Gauge. Roebling = Washburn Moen, American Steel & Wire Co.'s Iron Wire Gauge. London! = Old English (Not Old English Standard). As a further complication: Birmingham or Stubs' Iron Wire Gauge is not the same as Stubs
Page 498 - Circumference Cube root of the solidity of a sphere x 1.2407 = Diameter Cube root of the solidity of a sphere x 3.8978 = Circumference Radius of a sphere x 1.1547 = Side of inscribed cube Square root of...
Page 465 - A wire which is three sizes larger than another wire has half the resistance, twice the weight and twice the area. A wire which is ten sizes larger than another wire has one-tenth the resistance, ten times the weight and ten times the area. No. 10 Wire is...

Bibliographic information