Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 48, Problem 10SQ
In Figure 48–7, is it necessary to push the stop button when changing the direction of rotation? Explain your answer.
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Section 5: Choose the correct Answer
What happens if field winding of the synchronous motor is short
* circuited
First, starts as induction motor then run as synchronous motor
Not start
Motor will burn out
Run as induction motor
i da - When the field of a synchronous motor is over excited, the power factor
will be
Leading O
Lagging
Zero
Unity
The synchronous motors are not self-starting because
The direction of torque on the rotor reverses after every half cycle. O
Slip is not present in synchronous machine
Starting winding is not present in the synchronous machine
DC excitation is used
i need the answer quickly
Explain why synchronous motor doesn’t have any self-starting torque. Demonstrate some measures to make it self-starting.
Please dont copy
Chapter 48 Solutions
Electric Motor Control
Ch. 48 - In Figure 482, what is the purpose of normally...Ch. 48 - Can a time-delay relay be used satisfactorily in a...Ch. 48 - Prob. 3SQCh. 48 - Prob. 4SQCh. 48 - Prob. 5SQCh. 48 - What is the purpose of the lockout relay or safety...Ch. 48 - What happens if the reverse push button is closed...Ch. 48 - Prob. 8SQCh. 48 - Prob. 9SQCh. 48 - In Figure 487, is it necessary to push the stop...
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- Induction 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_forward(U.E.I., 0.2) 9. A shunt generator on test is separately excited and driven at 1000 rev/min. The open-circuit test figures are as follows: Field current (A) Induced e.m.f. (V) 0 0157 0-477 0-663 0-805 1-0 1-29 12:5 100 300 400 450 500 -550 The machine is then shunt-connected and run at 1000 rev/inin with a constant field-circuit resistance of 540 2. The armature-citcuit resistance is 1 0. Deduce and plot the load characteristic of this machine, neglecting the effect ol armature reaction. What is the ap- proximate value of the maximum load current ? 10. The onen.cirou (E MEILarrow_forward(U.E.L, 0.2) 9. A shunt generator on test is separately excited and driven at 1000 rev/min. The open-circuit test figures are as follows: 0 0157 0477 0 663 0-805 1-0 1-29 12-5 100 300 400 450 500 550 Field current (A) Induced e.m.f. (V) The machine is then shunt-connected and run at 1000 rev/min with a constant field-circuit resistance of 540 , The armature-circuit resistance is 1 0. Deduce and plot the load characteristic of this machine, neglecting the effect of armature reaction. What is the ap- proximate value of the maximum load current? 0. The open-circuit charactarrow_forward
- The figure below shows the step response of a close loop position control system, where the set point is equal to 5 meters Based on this figure, Answer the questions (22-25) 22. The rising time is equal to * Step Response 1 0.5 1.5 Time (seconds) Amplitudearrow_forwardIndicate whether the following statement are true or false True False Dc shunt motor is best suited where low starting torque is required Indicate whether the following statement are true or false * True False To solve the Commutation Problem in large machines, this can be achieved by increasing the brush widtharrow_forwardsynchronous motorarrow_forward
- Please write text, not handwritingarrow_forwardWhy induction motor cannot run on synchronous speed? Explain using slip.arrow_forward(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 5.4. 3-When a series de motor is operated without a load, the armature draws excessive current Ph 4- The hysteresis loss can be minimized by using core of thin laminations ل لهول 259 Ne 02arrow_forward
- 3 Phase Induction motor I want a short answer please 11. The number of three-phase induction motor parts and the function of each part. 12. How to know the terminals of an induction motor if they are not encoded in the terminal box. 13. How can a three-phase induction motor be reversed? 14. Number of tools used to protect devices - transformers and induction motors - in the laboratory. 15. The number of devices required to conduct a test No load. for a three-phase induction motor 16. The number of devices required to conduct a test For a three-phase induction motor, a Blocked rotor 17. What is the use of a test? For a three-phase induction motor? Blocked rotor and No load 18. When conducting the no-load test, the current rises in the first second of preparation when using the direct connection method. the reasons for that? 19. When performing a non-pregnancy test, we notice a decrease in the ability factor. the reasons for that? 20. Connect an induction motor directly to the source.…arrow_forwardQuèstion 14 Driving torque in electromagnetic induction relay is proportional to the square of current in relay coil True Falsearrow_forwardI need answer within 30 minutes please with my best wishes MOarrow_forward
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