A three-phase, 50-Hz, 4-pole, 575-V (line-line, rms) induction motor drive has a full-load (rated) speed of 1450 rpm. The rated torque is 50 Nm. Keeping the air gap flux-density peak constant at its rated value, (a) plot the torque-speed characteristics (the linear portion) for the following values of the frequency: 50 Hz, 40 Hz, 30 Hz and 20 Hz. (b) This motor is supplying a load whose torque demand increases linearly with speed such that it equals the rated motor torque at the rated motor speed. Calculate the speeds of operation at 50 Hz, 40 Hz, 30 Hz and 20 Hz.

A three-phase, 50-Hz, 4-pole, 575-V (line-line, rms) induction motor drive has a full-load (rated) speed of 1450 rpm. The rated torque is 50 Nm. Keeping the air gap flux-density peak constant at its rated value, (a) plot the torque-speed characteristics (the linear portion) for the following values of the frequency: 50 Hz, 40 Hz, 30 Hz and 20 Hz. (b) This motor is supplying a load whose torque demand increases linearly with speed such that it equals the rated motor torque at the rated motor speed. Calculate the speeds of operation at 50 Hz, 40 Hz, 30 Hz and 20 Hz.

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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