Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 57, Problem 7SQ
To determine
Explain why the motor should have a full shunt field for below base speed operation.
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Explain how to reverse the direction of rotation of a stabilized-shunt motor? What is the condition when this motor will operate as differential compound motor ?
4. A synchronous motor starts but fails to develop its full torque. What could it be due to?
5. What is the relationship between speed and torque regulation in dc shunt motors?
In an asynchronous motor, why does the motor slip value increase as the torque value increases? (explain verbally)
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Electric Motor Control
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- What is the principal reason for using star-delta motors?arrow_forwardWhat is the effect of the starting winding of the synchronous motor on running speed?arrow_forwardQuestions: 1 - why does the speed fall slightly when the d.c. shunt motor is loaded? 2- What is the effect of armature reaction in on the speed of the motor? 3- Discuss the behavior of the efficiency output power curve? 4 - Enumerate different losses which take place in a loaded shunt motor ؟arrow_forward
- Why is the starting torque of the series motor high?arrow_forwardExplain the methods of starting asynchronous motors and drawing Star / Delta starting, also explain the rationale for the method?arrow_forwardDefine pull out torque and what are the points to be considered when the load on the synchronous motor is increased?arrow_forward
- Explain how you can adjust the speed of the asynchronous motor to different values, provided that the asynchronous motor driver keeps the sliding value constant.arrow_forwardWhat is the ratio of the outer cage torque to the inner cage torque of the indcution motor?arrow_forwardDefine ‘shaft torque’ and ‘armature torque’ for a DC motor? Explain why a series motor ispreferred for applications requiring high starting torque over shunt motor? Which motor hashigher speed regulation?arrow_forward
- Why is there a need to stop medium motors before reversing its direction in a control circuit?arrow_forward1-) a) Does the slip increase as the load increases in an asynchronous motor? Explain what is the reason for this. b) What does it mean when the slip is 0, 1, -1 in asynchronous motor, how is it achieved? Explain.arrow_forwardtask 6 Analyse the performance of a DC motor speed control when subjected to external disturbances.arrow_forward
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