3. A 75 KW, 60 Hz, 480V, 1176 pm, 3-© induction motor is operating under full load. Measurements indicate a power factor of 80 lagging and an efficiency of 0.90. Determine the following at rated operating conditions: a. The magnitude of the current drawn by the motor. b. The real, reactive, and complex power drawn by the motor. c. The output torque at full-load. d. The operating slip Hint: For part d, we don't know the number of poles! The only possible combinations are 2, 4, 6, and 8 poles. Find the closest Synchronous speed to the given rated speed to find the number of poles
3. A 75 KW, 60 Hz, 480V, 1176 pm, 3-© induction motor is operating under full load. Measurements indicate a power factor of 80 lagging and an efficiency of 0.90. Determine the following at rated operating conditions: a. The magnitude of the current drawn by the motor. b. The real, reactive, and complex power drawn by the motor. c. The output torque at full-load. d. The operating slip Hint: For part d, we don't know the number of poles! The only possible combinations are 2, 4, 6, and 8 poles. Find the closest Synchronous speed to the given rated speed to find the number of poles
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter32: Three-phase Motors
Section: Chapter Questions
Problem 6RQ: Name three factors that determine the torque produced by an induction motor.
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3. A 75 KW, 60 Hz, 480V, 1176 pm, 3-© induction motor is operating under full load. Measurements indicate a power factor of 80 lagging and an efficiency of 0.90. Determine the following at rated operating conditions:
a. The magnitude of the current drawn by the motor.
b. The real, reactive, and complex power drawn by the motor.
c. The output torque at full-load.
d. The operating slip
Hint: For part d, we don't know the number of poles! The only possible combinations are 2, 4, 6, and 8 poles. Find the closest Synchronous speed to the given rated speed to find the number of poles
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VIEWStep 2: Calculating real, reactive, and complex power drawn by the motor.
VIEWStep 3: Calculating the magnitude of the current drawn by the motor.
VIEWStep 4: Calculating the full load output torque.
VIEWStep 5: Calculating the operating slip.
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