A 3-phase induction motor has a synchronous speed of 250 r.p.m. and 4% slip at full-load. The rotor has a resistance of 0.020 per phase and standstill leakage reactance of 0.152 per phase. Calculate (i) the ratio of maximum and full-load torque (ii) the speed at which the maximum torque develops. Neglect resistance and leakage reactance of the stator. Ans[1.82, 217 r.p.m]
A 3-phase induction motor has a synchronous speed of 250 r.p.m. and 4% slip at full-load. The rotor has a resistance of 0.020 per phase and standstill leakage reactance of 0.152 per phase. Calculate (i) the ratio of maximum and full-load torque (ii) the speed at which the maximum torque develops. Neglect resistance and leakage reactance of the stator. Ans[1.82, 217 r.p.m]
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter32: Three-phase Motors
Section: Chapter Questions
Problem 6RQ: Name three factors that determine the torque produced by an induction motor.
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![A 3-phase induction motor has a synchronous speed of 250 r.p.m. and 4% slip at full-load. The
rotor has a resistance of 0.022 per phase and standstill leakage reactance of 0.152 per phase.
Calculate (i) the ratio of maximum and full-load torque (ii) the speed at which the maximum
torque develops. Neglect resistance and leakage reactance of the stator.
Ans[1.82, 217 r.p.m]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F76e1cf01-54ad-428a-80be-449f2b75c0e3%2Ff31801d6-f6f8-43bc-888e-04fd74bb235e%2Fl4k9feh_processed.jpeg&w=3840&q=75)
Transcribed Image Text:A 3-phase induction motor has a synchronous speed of 250 r.p.m. and 4% slip at full-load. The
rotor has a resistance of 0.022 per phase and standstill leakage reactance of 0.152 per phase.
Calculate (i) the ratio of maximum and full-load torque (ii) the speed at which the maximum
torque develops. Neglect resistance and leakage reactance of the stator.
Ans[1.82, 217 r.p.m]
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