Recent Types of Dynamo-Electric Machinery: a Complete Guide for the ...
Recent Types of Dynamo-Electric Machinery: a Complete Guide for the ...
Edwin James Houston, Arthur Edwin Kennelly
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It delivers 150 K. W., at 700 revolutions per minute, at a frequency of 140 cycles per second. Its pressure is either 1,000 or 2,000 volts. This machine is com- pounded to maintain its pressure under load, or, it ttiay be over-compounded, so as to increase its pressui*e five per cent or ten per cent at full load. This enables the pressure to be maintained constant under load, at the end of a comparatively long feeder. The armature shaft has three bearings. The machine is provided with a small e...xciter driven by a small pulley and belt from the armature shaft as shown. There are two collector rings, and a commutator for the compound- winding. The brushes on the collector rings, as well as on tbe commutator, are doubled to ensui'e good t^ontat^t. Digitized by Google J)ynamO'Electric Machinery • 22£^ a f t o o 3 1 3 Digitized by Google Digitized by Google Dynamo-Electric Moxhinery. 227 S I o g I > I Digitized by Google 228 Meomt Types vf The connections of the armature and field are shown in Fig.lil.
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