Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
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Textbook Question
Chapter 36, Problem 9SQ
Why is it necessary to remove the jumpers in Figure 36–2 if limit switches are used?
FIG. 36–2 Typical elementary diagram of a starter with two points of acceleration for a reversing wound rotor motor.
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What is the answer for Question 13?
6.a. When you're taking a PM motor apart you should exercise special care not to damage theA. end bells.B. commutator.C. permanent magnets.D. brush holders.6.b. A PM field servo motor may be equipped with a resolver that is used toA. excite the armature windings.B. create a voltage that increases with velocity.C. prevent the brushes from sparking.D. feed back position information.
How to avoid the effect of the high current at starting of the Motor?
a.
variable resistor is connected in series with Armature circuit
b.
variable resistor is connected in parallel with Armature circuit
c.
variable resistor is connected in series with field circuit
d.
None of the above
Clear my choice
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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