A 480V, 60Hz, six-pole, Y connected cage rotor induction motor has the following parameters in ohms per phase referred to the stator: R1=0.5Ω X1=1.1Ω R2=0.45Ω X2=0.6Ω Xm=30Ω The total rotational losses (friction, windage, and core losses) are 1100W and are assumed to be constant. For a rotor slip of 2.2% at the rated voltage and rated frequency, calculate: a) Rotor speed b) Stator current c) Complex, real, and reactive input power and the power factor of the machine d) The air-gap power (Pag) and the developed mechanical power (Pconv) e) Developed electromechanical torque, and the output mechanical torque f) Efficiency
A 480V, 60Hz, six-pole, Y connected cage rotor induction motor has the following parameters in ohms per phase referred to the stator: R1=0.5Ω X1=1.1Ω R2=0.45Ω X2=0.6Ω Xm=30Ω The total rotational losses (friction, windage, and core losses) are 1100W and are assumed to be constant. For a rotor slip of 2.2% at the rated voltage and rated frequency, calculate: a) Rotor speed b) Stator current c) Complex, real, and reactive input power and the power factor of the machine d) The air-gap power (Pag) and the developed mechanical power (Pconv) e) Developed electromechanical torque, and the output mechanical torque f) Efficiency
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Russell E. Smith
Chapter8: Basic Electric Motors
Section: Chapter Questions
Problem 13RQ: Which of the following correctly lists the motor’s starting torque from lowest to highest?
capacitor...
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A 480V, 60Hz, six-pole, Y connected cage rotor induction motor has the following
parameters in ohms per phase referred to the stator:
| R1=0.5Ω X1=1.1Ω |
R2=0.45Ω X2=0.6Ω |
Xm=30Ω |
The total rotational losses (friction, windage, and core losses) are 1100W and are assumed
to be constant. For a rotor slip of 2.2% at the rated voltage and rated frequency, calculate:
a) Rotor speed
b) Stator current
c) Complex, real, and reactive input power and the power factor of the machine
d) The air-gap power (Pag) and the developed
e) Developed electromechanical torque, and the output mechanical torque
f) Efficiency
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