A 4-pole, 1755 rpm, 60 Hz, 3-phase induction motor star has the following circuitmodel parameters: R = 0.2 2, R; = 0.1 2, X, = 0.5 2, X;' 0.2 2, X, 20 2 and thephase voltage is 231 V. If rotational loss of 900 W and Ro is negligible, calculates:1- The electromagnetic torque, maximum torque in N.m and efficiency of rotor.2-The external resistance per phase which must be added of the rotor to reduce the speed1530 rpm and torque remaining the same ( neglected X,).3- The maximum gross power and the slip at which it occurs when exciting circuit isomitted.

The induction motor work on the principle of magnetic induction. An emf is developed in the rotor…

Answered: N.m and efficiency of added of the…

Engineering

Electrical Engineering

N.m and efficiency of added of the rotor to rec

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

Winding and Constructions

Alternating Current (AC) winding is generally of the 3-phase type due to the inherent advantages of the 3-phase machine. Armature coils must be connected to the yield balance (equivalent in magnitude and 2/3 of the series phase difference of the rod) 3-phase electromotive forces (emf). The armature should be divided into step-bands to start with slots around the perimeter.In the construction of AC machines, the frame is used as an external protective shield to protect it from environmental conditions. The frame also serves as the outer perimeter, allowing the interior to be easily placed. The static state section of the devices is the stator winding attached stator.

Question

A 4-pole, 1755 rpm, 60 Hz, 3-phase induction motor star has the following circuit
model parameters: R = 0.2 2, R; = 0.1 2, X, = 0.5 2, X;' 0.2 2, X, 20 2 and the
phase voltage is 231 V. If rotational loss of 900 W and Ro is negligible, calculates:
1- The electromagnetic torque, maximum torque in N.m and efficiency of rotor.
2-The external resistance per phase which must be added of the rotor to reduce the speed
1530 rpm and torque remaining the same ( neglected X,).
3- The maximum gross power and the slip at which it occurs when exciting circuit is
omitted.

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