Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 31, Problem 3SQ
To determine
What happens when too many transitions are made by an operator from low speed to high speed and back on a two-speed motor.
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Chapter 31 Solutions
Electric Motor Control
Ch. 31 - Excluding slip, at what speed (r/min) will an...Ch. 31 - What is meant by the description separate winding...Ch. 31 - Prob. 3SQCh. 31 - Prob. 4SQCh. 31 - In Figure 314, what does the broken line between...Ch. 31 - When the high button is depressed in Figure 314,...Ch. 31 - Which coils are energized immediately when the...Ch. 31 - At what speed can a four-pole, 240-volt, 5-hp,...Ch. 31 - What is meant by the compelling action produced by...Ch. 31 - Prob. 10SQ
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- What is meant by an open transition from start to run? Why is this condition objectionable at times when used with large horsepower motors?arrow_forwardFor what purpose is the short circuit test performed in asynchronous motor? Please explain.arrow_forwardWhy can’t Synchronous motor start by itself. What techniques are available to start a synchronous motor?arrow_forward
- Explain what are the values to be taken into account in the Y / ∆ starting asynchronous motor nameplate.arrow_forwardTechnician 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_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_forward
- Where is the best place to look to find specific information about a motor, such as horsepower, voltage, full-load current, service factor, and full-load speed?arrow_forwardExcluding slip, at what speed (r/min) will an eight-pole, 60-hertz, 240-volt motor run?arrow_forwardIn an asynchronous motor, why does the motor slip value increase as the torque value increases? (explain verbally)arrow_forward
- Explain the methods of starting asynchronous motors and drawing Star / Delta starting, also explain the rationale for the method?arrow_forwardWhich dc motor is used in fan??(be quick)arrow_forwardelectrical machines (How does an asynchronous motor behave when there is a load?) explain by drawing an experiment connection diagram. the loaded experiment of induction motor (asynchronous motor) after that Briefly explain the loaded operating characteristic by drawing.arrow_forward
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