Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Question
Chapter 47, Problem 1SQ
To determine
Explain the origin of DC power for the DC motor.
Expert Solution & Answer
Explanation of Solution
DC motors are highly used in industries due to its versatility property. DC motors provide torque at a low speed. Even at the nameplate speed or above the nameplate speed, the motor can be operated constantly. DC power supply is required to operate the DC motor.
Due to the wide use of solid state rectifiers, a DC power plant and the distribution system is not required to develop the DC power. In AC distribution system, AC power can be rectified to DC power by using the solid state electronic devices at the motor site.
Conclusion:
Thus, the origin of DC power for the DC motor is explained.
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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
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⚫furling or cut-out speed is 20 m/s
(ii) Given part (i), calculate the energy produced in one day if the wind blows
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Problem b. Suppose an anemometer mounted at a height of 10 m with a 20-m/s average wind
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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
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