. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . Fig. 9T.—Field-inaguet. 24U DYIfAMO-ELECTRIC Fifj. IC,.F108. StH-10:i. \\isLiiij;li<)usc altiTiialiii^jcnrrfrit arc-linht dynamo. DYNAMO-ELECTRIC MACHINES. 241 in the line is generally followed by the cessation of current in the armature when a series-machine is employed; but in this system a break in the external circuit causes the generationof a heavy current in the armature, which, if not prevented,
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . Fig. 9T.—Field-inaguet. 24U DYIfAMO-ELECTRIC Fifj. IC,.F108. StH-10:i. \\isLiiij;li<)usc altiTiialiii^jcnrrfrit arc-linht dynamo. DYNAMO-ELECTRIC MACHINES. 241 in the line is generally followed by the cessation of current in the armature when a series-machine is employed; but in this system a break in the external circuit causes the generationof a heavy current in the armature, which, if not prevented, would eventually cause itsdestruction. To avoid this, the apparatus shown is employed, and its function is to short-circuit the armature. By this means the counter-electromotive force generated in the arma-ture is such as to cut down the lieavy current to the normal strength, so that no dangerousheating of the armature-coils can take place, The apparatus is so constructed that an excessof electromotive force generated in the armature, such as would be caused by a break in theline, causes a spark to pass between two points ; this allows sufficient current tq pass to ener-gize the solenoid, which pulls up its core and makes conta
Size: 1213px × 2060px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
