Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 43, Problem 6SQ
To determine
Explain the reason for the increase in the speed of motor with the decrease of current flow to shunt field.
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(Im) Does the excitation circuit current change as the motor current changes? explain the reasons. (DC shunt motor).
Explain why reduced current is important during the motor acceleration
21.a. When field voltage is controlled to provide a method of variable speed control, the system is using aconcept known as fieldA. stability.B. drive.C. bias.D. weakening.
21.b. What type of motor has the same wire diameter in both the field and the armature coils?A. Interpole-woundB. Series-woundC. Compound-woundD. Shunt-wound
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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
- What is the principal reason for using star-delta motors?arrow_forwardIn an asynchronous motor, why does the motor slip value increase as the torque value increases? (explain verbally)arrow_forwardA 240-volt shunt motor takes 5 amperes on no-load. The armature resistance is 0.25 ohm and the field resistance is 200 ohms. Calculate the efficiency when taking full load current of 50 amperes and the percentage change in speed between no-load and full-load.arrow_forward
- Synchronous motor when the load is taken completely while working at full load in all properties Does it change properties? Explain.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_forwardDepending on their power factor ratings, what is the range of the leading power factor at which synchronous motors operate?arrow_forward
- In Synchronous Motor Operation How the regulating characteristics can be obtained from V curve?arrow_forwardDoes the excitation circuit current change as the D.C shunt motor current changes? explain the reasons.arrow_forward1-D.C. shunt motor maintains a more constant speed under varying load. (True or False) 2-Dc shunt motor is best suited where low starting torque is required. (True or False) 3-The speed of d.c series motor is increased if the armature current is increased. (True or False)arrow_forward
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