EBK ELECTRIC MOTOR CONTROL
10th Edition
ISBN: 9780100784598
Author: Herman
Publisher: YUZU
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Chapter 51, Problem 7SQ
To determine
Explain why there is no danger in reversing of motor after it is stopped by braking.
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(B)- Indicate whether the following statements are true or false and correct the false
statements
1- Wave wound armature has two parallel paths.
2- The current ratio is equal to 1/ turn ratio at no-load while the voltage ratio is
equal to 1/ turn ratio at full load
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3-When a series de motor is operated without a load, the armature draws
excessive
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4- The hysteresis loss can be minimized by using core of thin laminations
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Do the question below
1- What causes a three-phase motor to run backwards?
2- How we can reverse the direction of the induction motor?
3- What are the advantages of changing the direction of an induction motor for
a 3-phase?
4- What is a forward reversing motor control circuit?
5- What is the application of the forward and reverse motor?
6- Why do we change the direction of the rotation of a 3-phase induction motor?
Chapter 51 Solutions
EBK ELECTRIC MOTOR CONTROL
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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
- The industry standard for reversing the rotation of a wound-rotor motor is to _______ a. Reverse T1 and T3 b. Reverse M1 and M3 c. Reverse T2 and T3 d. Reverse M2 and M3arrow_forwardExplain why the use of switching drives can be problematical when driving an inductive load, and how any problems may be overcomearrow_forwardAssume all of the timers are set for a 3 second delay. When the start button is pressed, nothing happens. None of the motors start. Which of the following could NOT cause this problem. a Overload contact OL1 is open b 1CR relay coil is open c 2CR relay coil is open d The stop button is openarrow_forward
- Explain how does the current will be reduced during the starting of the motor.arrow_forwardInduction motor speed control technique which is not recommended to be used at low speed is O V-I control O stator voltage control O slip power control O V-F controlarrow_forwardIN Counter-Current Breaking o f a 3-Phase Induction Motor(Reversing the Operation o f a 3-Phase Induction Motor) How it was insured in the control circuit as to avoid the operation of both positiveand negative sequences simultaneously?arrow_forward
- Can you give me all the different types of DC motor its quite confusing coz some info says it has only 4 which is series , shunt , compount , and permanent magnet which is only under the category of brushed DC motors it doesnt include yet the brushless and the sub category however when you recognize or notice that in flowchart there are several like the one self excited etc I wonder if its an updated version though but I need you to list all of them and explain each and what category or subcategory I mean the overall DC motors even in chatgpt there are some added like universal , stepper , servo , coreless and so on. Explain each one. Pls help me if you could summarize or elaborate all at once so that it would be easy to identify or determine the overall information and additionally per category should have definition as well as the followingarrow_forwardWhat happens to a series connected direct current motor if its field winding opens at full load?arrow_forwardThere are 2 1000Watt 3-phase asynchronous motors in a Walnut Cracking machine (it is desirable to operate the motors in a way that they remain in star connection). When the "Start" button is pressed, the 1st engine will start immediately, 3 seconds after the 1st engine starts, the 2nd engine will also start. After the two engines work together for 4 seconds, the 1st engine will stop, the 2nd engine will start and stop for another 10 seconds. If the "Stop" button is pressed at any stage of the operations, the motors will stop. The rotation directions of the motors are required to be opposite to each other. Draw the necessary power and control circuit.arrow_forward
- There are 2 1000Watt 3-phase asynchronous motors in a Walnut Cracking machine (it is desirable to operate the motors in a way that they remain in star connection). When the "Start" button is pressed, the 1st engine will start immediately, 3 seconds after the 1st engine starts, the 2nd engine will also start. After the two engines work together for 4 seconds, the 1st engine will stop, the 2nd engine will start and stop for another 10 seconds. If the "Stop" button is pressed at any stage of the operations, the motors will stop. The rotation directions of the motors are required to be opposite to each other. Draw the necessary power and control circuit.(EKTS )arrow_forward4/arrow_forwardc) Based on Figure 3 (c), a basic DOL starter induction motor at a power station is experiencing run-time error and unable to start, based on your understanding, interpret the sequence of troubleshooting shall be carried out to identify the root cause of the abnormalities. 3P 1P MCB MCB STOP K1 START MOTOR Figure 3 (c)arrow_forward
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