Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 59, Problem 5SQ
Motors will operate satisfactorily at what percent over and under voltage?
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Explain how does the current will be reduced during the starting of the motor.
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you are working as a plant electrician. you are told that a large DC motor was returned from the rewind shop and was installed on the previous shift. the motor seemed to operate properly until load was added, the motor then stopped, reversed direction, and began to run at a high speed. what is the probable cause of the trouble, and what would you do to correct the problem?
Chapter 59 Solutions
Electric Motor Control
Ch. 59 - Prob. 1SQCh. 59 - Why should the motor be run for a period of time...Ch. 59 - What may occur if a jumper is placed across coil M...Ch. 59 - In what position do ball-bearing motors function?Ch. 59 - Motors will operate satisfactorily at what percent...Ch. 59 - What basic sensory faculties should a...Ch. 59 - What is an orderly step-by-step procedure in...Ch. 59 - What might be a hazard if a motor is started in...Ch. 59 - Prob. 9SQCh. 59 - What are the probable causes of a noisy magnet?
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- How can you reduce the amount of voltage applied to the motor during inching?arrow_forwardWhy do you think some motor control circuit utilizes single voltage sources for control and power circuit? Explain.arrow_forward1. It is a machine that converts mechanical energy to electrical energy. 2. It is a machine that converts electrical energy to mechanical energy. 3. It is cylindrical or drum-shaped where the coils are placed and can either be lap wounded or wave wounded. 4. It connects the commutator to the other parts of the DC machine. 5. It serves as the housing of the dc machine. 6. True or False: The shunt field winding is part of the armature. 7. True or False: The long shunt compound generator is when the armature is in series with the series field winding and parallel to the shunt field winding. 8-10. Your newly built house needs an elevator. Which from the following will be best to use- series, shunt or compound motor and why?arrow_forward
- Answer all or else skip the question pleasearrow_forwardOne type of failure that's more common with 200 HP motors than with 10 HP motors is A. rotor bar failure.B. contactor failure.C. bearing failure. D. stator failures.arrow_forwardIf the speed of the driving motor falls due to loading what will be the effects?arrow_forward
- Why must a discharge resistor be connected in the field circuit for starting?arrow_forwardSelect the best answer for each of the following. The purpose of overload protection on a motor is to protect the a. motor from sustained overcurrents. b. wire from high currents. c. motor from sustained overvoltage. d. motor from short circuits.arrow_forward20. What is the effect of applying a lower-than-rated voltage to a fractional-horsepower motor?A. The motor will operate with increased magnetizing current.B. The motor will operate satisfactorily at 95% of the rated voltage.C. The motor will heat up dangerously.arrow_forward
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