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A 460-V,4-pole, 50-hp, 60-Hz, Y-connected, three-phase induction motor develops its full-load induced torque at 3.8% slip when operating at 60 Hz and 460 V. The per-phase circuit model impedances of the motor are: R1=0.33 Ohms X1=0.42 Ohms Xm=30.0 Ohms X2=0.42 Ohms Mechanical, core, and stray losses may be neglected in this problem. a. Find the value of the rotor resistance. b. Find Tmax, SmaxT, and the rotor speed at maximum torque for this motor. c. Find the starting torque of this motor d. What starting code letter should be assigned to this motor?

A 460-V,4-pole, 50-hp, 60-Hz, Y-connected, three-phase induction motor develops its full-load induced torque at 3.8% slip when operating at 60 Hz and 460 V. The per-phase circuit model impedances of the motor are: R1=0.33 Ohms X1=0.42 Ohms Xm=30.0 Ohms X2=0.42 Ohms Mechanical, core, and stray losses may be neglected in this problem. a. Find the value of the rotor resistance. b. Find Tmax, SmaxT, and the rotor speed at maximum torque for this motor. c. Find the starting torque of this motor d. What starting code letter should be assigned to this motor?

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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A 460-V,4-pole, 50-hp, 60-Hz, Y-connected, three-phase induction motor develops its full-load induced torque at 3.8% slip when operating at 60 Hz and 460 V. The per-phase circuit model impedances of the motor are: R1=0.33 Ohms X1=0.42 Ohms Xm=30.0 Ohms X2=0.42 Ohms Mechanical, core, and stray losses may be neglected in this problem. a. Find the value of the rotor resistance. b. Find Tmax, SmaxT, and the rotor speed at maximum torque for this motor. c. Find the starting torque of this motor d. What starting code letter should be assigned to this motor?
Transcribed Image Text:A 460-V,4-pole, 50-hp, 60-Hz, Y-connected, three-phase induction motor develops its full-load induced torque at 3.8% slip when operating at 60 Hz and 460 V. The per-phase circuit model impedances of the motor are: R1=0.33 Ohms X1=0.42 Ohms Xm=30.0 Ohms X2=0.42 Ohms Mechanical, core, and stray losses may be neglected in this problem. a. Find the value of the rotor resistance. b. Find Tmax, SmaxT, and the rotor speed at maximum torque for this motor. c. Find the starting torque of this motor d. What starting code letter should be assigned to this motor?
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