Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 36, Problem 1SQ
Are the secondary resistors connected in three uniform wye or delta sections?
Expert Solution & Answer
To determine
Explain whether the secondary rotor resistors are connected in wye or delta sections.
Answer to Problem 1SQ
The secondary rotor resistors are connected in wye sections.
Explanation of Solution
The secondary resistor starter is typically used for an automatic acceleration of wound rotor motors. It comprises of line starter for connecting primary (stator winding) circuit to the line and more number of accelerating contactors is used to shunt out resistance in the secondary circuit when rotor speed increases.
Refer to Figure 36-1 in the textbook which shows typical control circuit for accelerating a slip ring induction motor. In the circuit, the secondary resistor consists of three sets of uniform wye sections. Each wye section is connected to slip rings of the wound rotor motor. The wye section is also called as star section.
Conclusion:
Thus, the secondary rotor resistors are connected in wye sections.
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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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