"Verbal" notes and sketches for marine engineers : a manual of marine engineering practice, intended for the use of naval and mercantile engineer officers of all grades, and students, and is specially compiled for the use of engineer officers preparing for examinations of competency at home or abroad . Collector. Armature No. 3.—Three-Wire System. (With Single Dynamo.) The slip rings are also connected through the brushes to oneor more auto-transformers or balance coils, the middle or neutralpoint of the balance coils constituting the mid point of the directcurrent circuit. The sketch shows di
"Verbal" notes and sketches for marine engineers : a manual of marine engineering practice, intended for the use of naval and mercantile engineer officers of all grades, and students, and is specially compiled for the use of engineer officers preparing for examinations of competency at home or abroad . Collector. Armature No. 3.—Three-Wire System. (With Single Dynamo.) The slip rings are also connected through the brushes to oneor more auto-transformers or balance coils, the middle or neutralpoint of the balance coils constituting the mid point of the directcurrent circuit. The sketch shows diagrammatically a two-pole direct currentarmature. The direct brushes are shown as bearing on the com-mutator, and the four slip rings are connected to points on thearmature diametrically opposite. An alternating voltage appears at 688 Verbal Notes and Sketches the slip rings, having a frequency equal to the number of polesmultiplied by the speed. Thus a four-pole generator running at3000 revolutions per minute would have 12,000 alternations perminute = 100 periods per second. The balance coil is simply an alternating current transformer witha single winding, and a tap from the middle point, and since it isconnected to an alternating current circuit, an alternating magnetisingcurrent will flow through it
Size: 1922px × 1300px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookidverbalnotess, bookyear1917
