Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 42, Problem 10SQ
Why is a control relay (CR1) used in Figure 42–6?
FIG. 42–6 Line diagram for automatic operation of synchronous motor using polarized field frequency relay.
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Q5. Describe the following to protect and control the motors:
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Using circuit diagram and the current-time characteristics, explain the motor overload
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Explain using a circuit diagram how the motor will automatic shutdown when input
(ii)
fails?
(iii)
Explain using circuit diagram the under voltage protection of a motor
(iv)
Draw the circuit diagram to explain the adjustable-frequency drive for a 3-phase
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Explain how dc shunt motor is working with relevant circuit diagram
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Chapter 42 Solutions
Electric Motor Control
Ch. 42 - What are the two basic methods of automatically...Ch. 42 - What is an out-of-step relay?Ch. 42 - Why is an out-of-step relay used on automatic...Ch. 42 - Under what conditions will the out-of-step relay...Ch. 42 - What is the last control contact that closes on a...Ch. 42 - What influence do both of the polarized field...Ch. 42 - Prob. 7SQCh. 42 - Approximately how much time (in terms of...Ch. 42 - How does the AC coil of the PFR receive the...Ch. 42 - Why is a control relay (CR1) used in Figure 426?...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- J1. What are the standard identification letters for the shunt field winding of a DC compound motor? a) A1 and A2 b) S1 and S2 C) F1 and F2 d) none of the above J2. The commutating field is another term for interpoles. a) true b) false J3. What are the standard identification letters for the commutating field winding of a DC compound motor? a) C1 and C2 b) S3 and S4 c) either "a" or "b" d) neither "a" nor "b"arrow_forward1. Explain the working Principle of Single Phase Induction Motor. 2. What are the different types of Starters to control AC-Motor. Explain briefly. 3. Explain DOL starter of Single Phase Induction Motor briefly. 4. What is the purpose of the magnetic contactor? 5. What is the use of auxiliary contact in the magnetic controller? 6. What happens when the holding coil gets the supply in the magnetic controller? 7. Explain the working principle of a relay.arrow_forward6- The injected e.m.f in the rotor of induction motor must have (a) The same frequency as the slip frequency. (c) A high value for satisfactory speed control. (d) The same phase as the rotor e.m.f and a high value for satisfactory speed control. (b) The same phase as the rotor e.m.f.arrow_forward
- 14. Under line voltage control of induction motor the speed regulation occurs: a) by change of the slip of the motor. b) by change of the synchronous speed of the motor. c) by adding additional resistance in the rotor circuit. d) by changing the stator resistance of the motor.arrow_forwardDefine or state the principle of operation, draw the wiring diagram, discuss the construction and application of each motor Split phase capacitor motor Repulsion motorarrow_forwardDEGREE: ELECTRICAL ENGINEERING SUBJECT/COURSE: AC MACHINES Answer the following questions (A, B and C) depending on the topic. 1. SYNCHRONOUS MOTORS A. What is necessary to start a synchronous motor to rotate from standstill? Describe the process. B. What is meant by synchronous condenser? C. Why is it possible for synchronous motors be used as a power factor correction device and what applications do synchronous motors commonly used? Describe the operation.arrow_forward
- B)- Draw a neat diagram to show the armature diverter method for speed control DC series motorsarrow_forwardCompare the properties of induction motor and synchronous motor.arrow_forwardWhat is the factor that enables the synchronous motor to operate at different electrical load characteristics? explain.arrow_forward
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