Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 36, Problem 5SQ
In Figure 36–2, how many different interlocking conditions exist? Name them.
Fig. 36–2 Typical elementary diagram of a starter with two points of acceleration for a reversing wound rotor motor.
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4- A 3-phase A -connected 220-V (line-to-neutral), 60-Hz 6-pole induction motor has the following parameter
values in O/phase referred to the stator: R1 = 0.294, R2 = 0.144, X, = 0.503, X2 = 0.209, Xm= 13.25. The total
friction, windage, and core losses may be assumed to be constant at 403 W, independent of load. For a slip of
5%,
a. Output torque
b. Stator current,
c. Power factor,
d. Converted power
e. Efficiency.
Find the number of resistance sections and the resistance of each section of a starter for a 3.7 kW, 230 V, dC series motor from the following data:-Starting current varies from 1 to 1.5 times full load current Full load efficiency = 85%
Motor circuit resistance 1.4 ohm
Assume flux increases by 10% as the current rises from 1 to 1.5 times the rated full load current.
14/ If the star-connected rotor winding of a 3-phase induction motor has a resistance of 0.010per
phase and a standstill reactance of 0.08 2 per phase, what must be the value of resistance per
phase of the stator to give a maximum starting torque? What is the percentage slip when the
starting resistance has been reduced to 0.022 per phase if the motor is still exerting the maximum
torque?
Ans[0.072: 37.5%].
Chapter 36 Solutions
Electric Motor Control
Ch. 36 - Are the secondary resistors connected in three...Ch. 36 - Do secondary resistors on starters with three or...Ch. 36 - Does reversing the secondary rotor leads mean that...Ch. 36 - If one of the secondary resistor contacts (S2)...Ch. 36 - In Figure 362, how many different interlocking...Ch. 36 - Referring to Figure 364, why is it not possible to...Ch. 36 - Prob. 7SQCh. 36 - If there is a locked rotor in the secondary...Ch. 36 - Why is it necessary to remove the jumpers in...Ch. 36 - Prob. 10SQ
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