3. A4-pole, 50-Hz induction motor has a full-load slip of 5%. Each rotor phase has a resistance of 0.3 Qand a standstill reactance of 1.2 . Find the ratio of maximum torque to full-load torque and the speedat which maximum torque occurs.[2.6 %; 1125 г.р.m.]4. A3-phase, 4-pole, 50-Hz induction motor has a star-connected rotor. The voltage of each rotor phaseat standstill and on open-circuit is 121 V. The rotor resistance per phase is 0.3 Q and the reactance atstandstill is 0.8 Q. If the rotor current is 15 A, calculate the speed at which the motor is running.Also, calculate the speed at which the torque is a maximum and the corresponding value of the inputpower to the motor, assuming the flux to remain constant.[1444 г.p.m.; 937.5 г.р.m.]

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ratio of maximum torque to full-load torque and the speed

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

Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.

Question

3. A4-pole, 50-Hz induction motor has a full-load slip of 5%. Each rotor phase has a resistance of 0.3 Q
and a standstill reactance of 1.2 . Find the ratio of maximum torque to full-load torque and the speed
at which maximum torque occurs.
[2.6 %; 1125 г.р.m.]
4. A3-phase, 4-pole, 50-Hz induction motor has a star-connected rotor. The voltage of each rotor phase
at standstill and on open-circuit is 121 V. The rotor resistance per phase is 0.3 Q and the reactance at
standstill is 0.8 Q. If the rotor current is 15 A, calculate the speed at which the motor is running.
Also, calculate the speed at which the torque is a maximum and the corresponding value of the input
power to the motor, assuming the flux to remain constant.
[1444 г.p.m.; 937.5 г.р.m.]

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