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Problem #2: A 3-phase induction motor has a star-connected rotor. The rotor emf (between slip rings) at standstill is 50 V. The rotor resistance and standstill reactance are 0.5 and 3 S2, respectively. Find rotor current per phase (a) at starting with the slip rings short circuited (b) at starting with a star-connected rheostat of resistance 6 ohms per phase connected across the slip rings. (c) if the motor is running at a slip of 4%.

Problem #2: A 3-phase induction motor has a star-connected rotor. The rotor emf (between slip rings) at standstill is 50 V. The rotor resistance and standstill reactance are 0.5 and 3 S2, respectively. Find rotor current per phase (a) at starting with the slip rings short circuited (b) at starting with a star-connected rheostat of resistance 6 ohms per phase connected across the slip rings. (c) if the motor is running at a slip of 4%.

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
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Problem #2: A 3-phase induction motor has a star-connected rotor. The rotor emf (between slip rings) at standstill is 50 V. The rotor resistance and standstill reactance are 0.5 and 3 2, respectively. Find rotor current per phase (a) at starting with the slip rings short circuited (b) at starting with a star-connected rheostat of resistance 6 ohms per phase connected across the slip rings. (c) if the motor is running at a slip of 4%.
Transcribed Image Text:Problem #2: A 3-phase induction motor has a star-connected rotor. The rotor emf (between slip rings) at standstill is 50 V. The rotor resistance and standstill reactance are 0.5 and 3 2, respectively. Find rotor current per phase (a) at starting with the slip rings short circuited (b) at starting with a star-connected rheostat of resistance 6 ohms per phase connected across the slip rings. (c) if the motor is running at a slip of 4%.
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