Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 35, Problem 7SQ
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Sketch the line diagram for a three-speed acceleration control with compelling timing relays.
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2. When field voltage is controlled to provide a method of variable speed control, the system is using aconcept known as fieldA. drive.B. stability.C. weakening.
14-Which is the most effective and currently used method in asynchronous motor speed control methods?A) changing the number of polesB) changing voltage and frequency togetherC) changing the voltage frequencyD) changing the applied voltage
Your Answers may be presented through Discussions, Drawings/Figures/Diagrams, Reference to NEC/PEC and Computations
What is the full-load current of a 230-volt, 3-phase, 125-horsepower synchronous motor when it is operated at an 80% power factor?
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- Technician A says a mild hybrid has stop-stari regenerative braking, and electric motor assist available when the engine needs added power to overcome the load . Technician B says a full hybrid has stop -start , regenerative braking electric motor assist , and can be driven by only electricity . Who is correct ?arrow_forwardExplain 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_forwardWrite the answer using clear explanations, details and diagrams:A load is attached to a synchronous motor. What will happen when the load is changed on this motor? As the synchronous motor requires adjusting field current, what effects does a change in field current have on the synchronous motor? Explain the effects of the changing parameters with the proper phasor diagram.arrow_forward
- Explain the working principle of Forward-Reverse, Start-Stop and Jog Motor control with your unique answers.arrow_forwardExplain what are the values to be taken into account in the Y / ∆ starting asynchronous motor nameplate.arrow_forward21.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-woundarrow_forward
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