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A three-phase, 3.3 kV, 50 Hz power supply is used to drive an induction motor. The motor has an eight-pole, star-connected stator. The rotor is also star-connected, with the line ends brought out to sliprings for starting and speed control. At standstill, the open circuit voltage induced on the rotor, as measured between the sliprings, is 1475 V. At the full load speed, the frequency of the induced emf on the rotor winding is 2.5 Hz. The motor has the following parameters: Rc = 250 Q R₁ = 0.1Q Xm=250 X₁ = 0.35 Q R2 = 0.04X2 = 0.30 By referring the rotor quantities to the stator, calculate the following: (i) The shaft output power and torque of the fully loaded motor, if the corresponding friction and windage losses are 44 kW;

A three-phase, 3.3 kV, 50 Hz power supply is used to drive an induction motor. The motor has an eight-pole, star-connected stator. The rotor is also star-connected, with the line ends brought out to sliprings for starting and speed control. At standstill, the open circuit voltage induced on the rotor, as measured between the sliprings, is 1475 V. At the full load speed, the frequency of the induced emf on the rotor winding is 2.5 Hz. The motor has the following parameters: Rc = 250 Q R₁ = 0.1Q Xm=250 X₁ = 0.35 Q R2 = 0.04X2 = 0.30 By referring the rotor quantities to the stator, calculate the following: (i) The shaft output power and torque of the fully loaded motor, if the corresponding friction and windage losses are 44 kW;

Delmar's Standard Textbook Of Electricity
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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A three-phase, 3.3 kV, 50 Hz power supply is used to drive an induction motor. The motor has an eight-pole, star-connected stator. The rotor is also star-connected, with the line ends brought out to sliprings for starting and speed control. At standstill, the open circuit voltage induced on the rotor, as measured between the sliprings, is 1475 V. At the full load speed, the frequency of the induced emf on the rotor winding is 2.5 Hz. The motor has the following parameters: Rc = 250 Q R₁ = 0.1Q Xm=250 X₁ = 0.35 Q R2 = 0.04X2 = 0.30 By referring the rotor quantities to the stator, calculate the following: (i) The shaft output power and torque of the fully loaded motor, if the corresponding friction and windage losses are 44 kW;
Transcribed Image Text:A three-phase, 3.3 kV, 50 Hz power supply is used to drive an induction motor. The motor has an eight-pole, star-connected stator. The rotor is also star-connected, with the line ends brought out to sliprings for starting and speed control. At standstill, the open circuit voltage induced on the rotor, as measured between the sliprings, is 1475 V. At the full load speed, the frequency of the induced emf on the rotor winding is 2.5 Hz. The motor has the following parameters: Rc = 250 Q R₁ = 0.1Q Xm=250 X₁ = 0.35 Q R2 = 0.04X2 = 0.30 By referring the rotor quantities to the stator, calculate the following: (i) The shaft output power and torque of the fully loaded motor, if the corresponding friction and windage losses are 44 kW;
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