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A 3-phase, 6-pole, 50-Hz induction motor has a peak torque of 6Nm and a starting torque of 3 Nm when operating at full voltage. Maximum torque occurs at a slip of 25%. When started at 1/3 of normal voltage the current is 2A. (a) What is the mechanical power, at peak torque when operating at normal voltage? (b) What maximum torque would the machine produce at 1/3 of normal voltage? (c) What starting current would the machine take when supplied with normal voltage?

A 3-phase, 6-pole, 50-Hz induction motor has a peak torque of 6Nm and a starting torque of 3 Nm when operating at full voltage. Maximum torque occurs at a slip of 25%. When started at 1/3 of normal voltage the current is 2A. (a) What is the mechanical power, at peak torque when operating at normal voltage? (b) What maximum torque would the machine produce at 1/3 of normal voltage? (c) What starting current would the machine take when supplied with normal voltage?

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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A 3-phase, 6-pole, 50-Hz induction motor has a peak torque of 6Nm and a starting torque of 3 Nm when operating at full voltage. Maximum torque occurs at a slip of 25%. When started at 1/3 of normal voltage the current is 2A. (a) What is the mechanical power, at peak torque when operating at normal voltage? (b) What maximum torque would the machine produce at 1/3 of normal voltage? (c) What starting current would the machine take when supplied with normal voltage? (d) What extra rotor-circuit resistance, as a percentage, would be required to give maximum torque at starting and what would then be the current, in terms of that at peak torque without external resistance?
Transcribed Image Text:A 3-phase, 6-pole, 50-Hz induction motor has a peak torque of 6Nm and a starting torque of 3 Nm when operating at full voltage. Maximum torque occurs at a slip of 25%. When started at 1/3 of normal voltage the current is 2A. (a) What is the mechanical power, at peak torque when operating at normal voltage? (b) What maximum torque would the machine produce at 1/3 of normal voltage? (c) What starting current would the machine take when supplied with normal voltage? (d) What extra rotor-circuit resistance, as a percentage, would be required to give maximum torque at starting and what would then be the current, in terms of that at peak torque without external resistance?
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