Armature Winding and Motor Repair: Practical Information and Data Covering Winding and Reconnectig Procedure for Direct and Alternating Current Machines, Compiled for Electrical Men Responsible for the Operation and Repair of Motors and Generators in Industrial Plants and for Repairmen and Armature Winders in Electrical Repair Shops
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3-phase air gap alternating current alternating-current amperes armature coils armature winding back pitches banding wire bearings belt bottom brushes cause cent coil sides commutator bars conductors connected in series copper core cotton tape delta connection diagram diameter direct current direct-current machines end connections equal fiber finish ends fish paper four-pole frequency fuses groups heating horsepower inch induction motor inserted lap winding layer leads load located magnetic mica mils thick number of bars number of coils number of commutator number of poles number of slots number of turns open circuit operation overload parallel power factor pulley reconnected removed repair resistance rheostat rotation rotor segments shaft shape shellac short circuit shown in Fig shunt single-phase slip rings soldered sparking speed stator strap strips surface switch temperature three-phase throw treated cloth trouble two-phase undercutting usually varnish voltage volts wave winding wedges wound
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 498 - Side of an equal square. Diameter of a circle X 0.8862 = Side of an equal square. Base of a triangle X by % the altitude = Area.
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 498 - Area of its base x -J of its altitude = solidity of a cone or pyramid, whether round, square, or triangular. Area of one of its sides x 6 = surface of a cube.
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 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 - 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".