EBK ELECTRIC MOTOR CONTROL
10th Edition
ISBN: 9780100784598
Author: Herman
Publisher: YUZU
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Question
Chapter 39, Problem 1SQ
To determine
Explain the reason why both rotor and stator should possess equal number of poles.
Expert Solution & Answer
Answer to Problem 1SQ
The reason why both rotor and stator should possess equal number of poles is to synchronize with each other.
Explanation of Solution
An independent field is established around the rotor, which is energized by a direct current through slip rings mounted on the shaft. The rotor has the same number of coils as the stator, so that each and every rotor pole (north and south) can have an alternative stator poles (north and south), and synchronize with each other. Therefore, the motor’s stator and rotor are in relative speed due to magnetism.
Conclusion:
Thus, the reason why both rotor and stator should possess equal number of poles is to synchronize each other.
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Students have asked these similar questions
Draw the equation USE BY HAN
Problem a. (i) Sketch the ideal power curve of the turbine with the following characteristics:
• rated speed is 14 m/s
⚫rated power is 1.25 MW
⚫ cut-in speed is 5 m/s
⚫furling or cut-out speed is 20 m/s
(ii) Given part (i), calculate the energy produced in one day if the wind blows
continuously between 15 and 20 m/s all day
(iii) Can the energy produced in one year be determined if you are told that the
average wind speed is 14 m/s? Explain why.
Problem b. Suppose an anemometer mounted at a height of 10 m with a 20-m/s average wind
speed
(i) Estimate the average wind power at a height of 10 m, assuming Rayleigh
statistics and under the following weather conditions
• 15°C
(ii) Suppose a 1300-kW wind turbine with 60-m rotor diameter is located in those
winds with speed computed in the first condition of part (i). Determine the annual
energy production with a 30% wind turbine efficiency
(iii) Evaluate the wind turbine capacity factor
Chapter 39 Solutions
EBK ELECTRIC MOTOR CONTROL
Ch. 39 - Prob. 1SQCh. 39 - What is the effect of the starting winding of the...Ch. 39 - What are typical applications of synchronous...Ch. 39 - Prob. 4SQCh. 39 - A loaded synchronous motor cannot operate...Ch. 39 - Why must a discharge resistor be connected in the...Ch. 39 - Depending on their power factor ratings, what is...Ch. 39 - At what power factor do incandescent lights...Ch. 39 - Prob. 9SQCh. 39 - The speed of a synchronous motor is fixed by the...
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