A 460V, 25 hp [1 hp = 746 watts], 60 Hz, four-pole, Y-connected induction motor has the following impedances in ohms per phase referred to the stator circuit: R₁ = 0.6412, R₂=0.33202, X₁ = 1.106 2, X2=0.464 Q2, XM = 26.3 2. The total rotational losses are 1100 W and are assumed to be constant. The core loss is lumped in with the rotational losses. For a rotor slip of 2.2 percent at the rated voltage and rated frequency, calculate the: (a) motor speed. (b) stator current. (c) power factor. (d) converted power PCON. (e) power output POUT. (f) induced torque and the load torque. (g) motor efficiency.

A 460V, 25 hp [1 hp = 746 watts], 60 Hz, four-pole, Y-connected induction motor has the following impedances in ohms per phase referred to the stator circuit: R₁ = 0.6412, R₂=0.33202, X₁ = 1.106 2, X2=0.464 Q2, XM = 26.3 2. The total rotational losses are 1100 W and are assumed to be constant. The core loss is lumped in with the rotational losses. For a rotor slip of 2.2 percent at the rated voltage and rated frequency, calculate the: (a) motor speed. (b) stator current. (c) power factor. (d) converted power PCON. (e) power output POUT. (f) induced torque and the load torque. (g) motor 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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