Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 51, Problem 5SQ
To determine
Explain how the control circuit contacts are protecting the motor.
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Question- A plane wave in a non-magnetic medium
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E = 50 sin(10®t +2)ây
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Express this graph/signal as a sum of singularity functions. Please give a proper solution.
2) A 208 V, four-pole, 60 Hz, Y-connected, wound-rotor induction motor has a rated power of 30 HP. The components of its equivalent circuit are R1 = 0.100
R2 = 0.070
XM = 10.0
X1 = 0.210
X2 = 0.210
Pmec = 500 W
Psup ~ 0
Pcore = 400 W
For a slip of 0.05, find:
a) The line current
b) The stator copper losses PcE
c) The air gap power PEF
d) The power converted from mechanical to electrical form Pconv
e) The induced torque _ind
f) load torque _load
g) The total efficiency of the machine
h) The speed of the motor in revolutions per minute and in radians per second
Chapter 51 Solutions
Electric Motor Control
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