A 2-pole, 3-phase induction motor delivers 37 hp at the shaft at a speed of 2850 rpm on 500V, 50Hz supply. The mechanical losses are 3.5hp and the power factor of operation is 0.85. Calculate (i) slip (ii) rotor copper loss (iii) total power input if the stator losses are 2500 Watts (iv) efficiency (v) Line current.

A 2-pole, 3-phase induction motor delivers 37 hp at the shaft at a speed of 2850 rpm on 500V, 50Hz supply. The mechanical losses are 3.5hp and the power factor of operation is 0.85. Calculate (i) slip (ii) rotor copper loss (iii) total power input if the stator losses are 2500 Watts (iv) efficiency (v) Line current.

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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Concept explainers

Three Phase Induction Motor

The induction motor is an electric motor that runs on AC (alternating current) and it is of two type single phase motor that work on single-phase power supply and three-phase motor that work on three-phase power supply.

Question

A 2-pole, 3-phase induction motor delivers 37 hp at the shaft at a speed of 2850 rpm
on 500V, 50Hz supply. The mechanical losses are 3.5hp and the power factor of operation
is 0.85. Calculate (i) slip (ii) rotor copper loss (iii) total power input if the stator losses are
2500 Watts (iv) efficiency (v) Line current.

Branch of science that deals with the stationary and moving bodies under the influence of forces.

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