. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . y. It will be noted that the speeds of these machines are consider-ably lower than those employed in the incandescent system, and that the number of alterna-tions per second is also far below that of the former, the average number approximating 7,500alternations per min., as compared with 16,000 for the incandescent machines. The machinesNos. 2 and 3 are provided with two sets of windings connected to two pairs of c
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . y. It will be noted that the speeds of these machines are consider-ably lower than those employed in the incandescent system, and that the number of alterna-tions per second is also far below that of the former, the average number approximating 7,500alternations per min., as compared with 16,000 for the incandescent machines. The machinesNos. 2 and 3 are provided with two sets of windings connected to two pairs of collectors, sothat two independent circuits can be run from one machine. Sizes and Capacity of Westinghouse A. C. Arc-Dynamos. Number oflights. Number ofcoils on arm. Number ofpole-pieces. Speed. AmpJres. No. 00 No. 0 No. 1 No. 2 2540601202i0 68101216 68101216 1, 10 10 10on 1 3Q - 2 circuits. No. 3 Kingdon Inductor Dynamo.—This dynamo (Fig. 104) has been designed to meet the wantsof electric-supply stations employing the alternating transformer, or the alternating directsystem. The main feature of the inductor dynamo is that all the bobbins of electric con-. FiG. 104.—Kingdon inductor dynamo. ducting wire are fixed: there are therefore no brushes or loose contacts. The number ofbobbins in use may be easily varied to suit the requirements of the supply; another ad-vantage is that, owing to the bobbins being fixed, even with high-tension currents, there isvery small risk of destroying the insulation of the machine. An inductor dynamo of 16 242 DYNAMO-ELECTRIC MACHINES. normal sizt—i. c, 50 kilowatts—has 32 coils wound, and mounted on 33 cores (radial), whichare composed of plates of tliin, verv soft charcoul-iron, magnetically insulated one from theother. Sixteen of these coils represent the lield-magnets of the dynamo, while the remaining16 intermediate ones correspond to the armatiire-ljobbins of other machines. 1 he cores andpoles of both field-magnets a
Size: 1678px × 1489px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
