Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 40, Problem 2SQ
To determine
Explain the purpose of interlock (M) in the DC control circuit.
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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
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X2 = 0.210
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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 40 Solutions
Electric Motor Control
Ch. 40 - What are the two basic functions of synchronous...Ch. 40 - Prob. 2SQCh. 40 - If all of the control circuits are ACand DC is not...Ch. 40 - When the rotor and stator fields lock into step,...Ch. 40 - Prob. 5SQCh. 40 - Prob. 6SQCh. 40 - In Figure 402, approximately what is the...Ch. 40 - Why are the AC ammeter and DC meter necessary in...Ch. 40 - Prob. 9SQ
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