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A 3.7 kW three-phase induction motor has a locked rotor current of 5 times the full load current and the full load slip is 5%. Find the starting torque as a percentage of full-load torque if the motor is started (i) Direct-on-line in delta connection (i.e. instantly connected to the supply through a breaker) (ii) Started initially as star connected (iii) Using a stator resistance to limit starting current to two times full-load current. Answer: (i) 125% (ii) 41.67% (iii) 20%

A 3.7 kW three-phase induction motor has a locked rotor current of 5 times the full load current and the full load slip is 5%. Find the starting torque as a percentage of full-load torque if the motor is started (i) Direct-on-line in delta connection (i.e. instantly connected to the supply through a breaker) (ii) Started initially as star connected (iii) Using a stator resistance to limit starting current to two times full-load current. Answer: (i) 125% (ii) 41.67% (iii) 20%

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
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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A 3.7 kW three-phase induction motor has a locked rotor current of 5 times the full load current and the full load slip is 5%. Find the starting torque as a percentage of full-load torque if the motor is started (i) Direct-on-line in delta connection (i.e. instantly connected to the supply through a breaker) (ii) Started initially as star connected (iii) Using a stator resistance to limit starting current to two times full-load current. Answer: (i) 125% (ii) 41.67% (iii) 20%
Transcribed Image Text:A 3.7 kW three-phase induction motor has a locked rotor current of 5 times the full load current and the full load slip is 5%. Find the starting torque as a percentage of full-load torque if the motor is started (i) Direct-on-line in delta connection (i.e. instantly connected to the supply through a breaker) (ii) Started initially as star connected (iii) Using a stator resistance to limit starting current to two times full-load current. Answer: (i) 125% (ii) 41.67% (iii) 20%
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