December 2012
Beginner
528 pages
17h 31m
English
Content preview from Introduction to Electrical Power and Power Electronics
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121AC and DC Motors
12. A 100-hp, 240-V dc shunt motor runs at 3450 rpm at rated conditions. If
its eld current is decreased by 15% while keeping the same load current,
determine its new speed.
13. A three-phase induction motor running from 460-V supply lines is drawing
60-A rated current at 0.90 power factor lagging. The power losses estimated
from the manufacturer’s data sheet at this load are 3000 W in the conduc-
tor, 1024W in the magnetic core, and 1000 W in friction and aerodynamic
windage. Determine (1) the output power and efciency at rated load and
(2) the maximum efciency and the corresponding percentage of load.
14. A three-phase, 50-hp, 460-V, letter code-G induction motor is connected
to 480 V
LL
lines via a transformer with ...
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