Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Textbook Question
Chapter 28, Problem 2RQ
What are the three basic types of direct current motors?
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In your opinion, which do you think is better, a stepper motor or a servo motor?
Why do you think so?
Problem 5
1.
Where and why is a centrifugal switch used in a split-phase motor?
2.
Why and where is a capacitor used in the single-phase AC motor?
3. What type of motor would you select to perform each of the following jobs?
(a) Electric drill:
(b) Refrigerator:
(c) Hair driers and desk fans:
(d) Air Conditioner Fan:
(e) XY plotters and printers:
(f) Electric clock:
Name three factors that determine the torque produced by an induction motor.
Chapter 28 Solutions
Understanding Motor Controls
Ch. 28 - Prob. 1RQCh. 28 - What are the three basic types of direct current...Ch. 28 - Prob. 3RQCh. 28 - What type of armature winding is generally used...Ch. 28 - Prob. 5RQCh. 28 - Prob. 6RQCh. 28 - Prob. 7RQCh. 28 - Prob. 8RQCh. 28 - Explain the difference between cumulative and...Ch. 28 - Prob. 10RQ
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- When a repulsion-start induction-run motor reaches about 75% of rated full-load speed, it stops operating as a repulsion motor and starts operating as a squirrel-cage motor. What must be done to cause the motor to begin operating as a squirrel-cage motor?arrow_forwardWhat type of single-phase motor develops the highest starting torque?arrow_forwardWhat is the advantage of the capacitor-start induction-run motor over the resistance-start induction-run motor?arrow_forward
- Name three factors that determine the amount of torque developed by a wound rotor induction motor.arrow_forward26. Explain the principles of DC motors, including the DC permanent magnet motor and how it can have speed control. (10 marks)arrow_forwardName three factors that determine the amount of voltage induced in the rotor of a wound-rotor motor.arrow_forward
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