1-The rotor of a 4 pole, 50 Hz, slip ring induction motor has a resistance of 0.25 ohm per phase and runs at 1440 rpm at full-load.Calculate the external resistance per phase, which must be added to lower the speed to 1200 rpm, torque remaining the same?
1-The rotor of a 4 pole, 50 Hz, slip ring induction motor has a resistance of 0.25 ohm per phase and runs at 1440 rpm at full-load.Calculate the external resistance per phase, which must be added to lower the speed to 1200 rpm, torque remaining the same?
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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1-The rotor of a 4 pole, 50 Hz, slip ring induction motor has a resistance of 0.25 ohm per phase and runs at 1440 rpm at full-load.Calculate the external resistance per phase, which must be added to lower the speed to 1200 rpm, torque remaining the same?
2- Calculate the torque developed per phase for a 6-pole, 60 Hz, 3-phase induction motor at a slip of 5%, if the motor develops a maximum torque per phase is 250 N.m while running at 870 r.p.m.
( This question is about electrical machines, and I need to answer in 30 minutes please )
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