A three phase, 460v, 60 Hz, 1740 rpm, four-pole, star connected wound-rotor induction motor has the following parameters per phase (R1=0.25 N, R'2= 0.2 N, X1=X'2= 0.5 N, Xm=30 Q). Core losses are neglected and the rotational losses are 1700 W. With the rotor terminals short-circuited, find 1/Full-load slip and full load-current. 2/ Full-load PF, full-load torque and motor efficiency. 3/ Starting current when started direct on full voltage and starting torque.

A three phase, 460v, 60 Hz, 1740 rpm, four-pole, star connected wound-rotor induction motor has the following parameters per phase (R1=0.25 N, R'2= 0.2 N, X1=X'2= 0.5 N, Xm=30 Q). Core losses are neglected and the rotational losses are 1700 W. With the rotor terminals short-circuited, find 1/Full-load slip and full load-current. 2/ Full-load PF, full-load torque and motor efficiency. 3/ Starting current when started direct on full voltage and starting torque.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Concept explainers

Three Phase Induction Motor

The induction motor is an electric motor that runs on AC (alternating current) and it is of two type single phase motor that work on single-phase power supply and three-phase motor that work on three-phase power supply.

Question

A three phase, 460v, 60 Hz, 1740 rpm, four-pole, star connected wound-rotor induction motor has
the following parameters per phase (R1=0.25 0, R'2= 0.2 0, X1=X°2= 0.5 N, Xm=30 0). Core losses are
neglected and the rotational losses are 1700 W.
With the rotor terminals short-circuited, find
1/Full-load slip and full load-current.
2/ Full-load PF, full-Hload torque and motor efficiency.
3/ Starting current when started direct on full voltage and starting torque.
4/ Slip at which maximum torque is developed and maximum developed torque.

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