The parameters of the equivalent circuit for a three-phase, delta- connected, 440V, 50Hz, four-pole induction motor, running at its rated load speed of 1445 revolutions per minute (rpm), are given below in ohms per phase referred to the stator: RI= 0.22, R2' = 0.35, Xi = X2* 1.87, Rm = 205 and Xm = 42. Determine: (i) The full - load slip

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

The parameters of the equivalent circuit for a three-phase, delta-
connected, 440V, 50Hz, four-pole induction motor, running at its rated
load speed of 1445 revolutions per minute (rpm), are given below in
ohms per phase referred to the stator: RI= 0.22, R2' = 0.35, Xi = X2*
1.87, Rm = 205 and Xm = 42. Determine:
(i) The full - load slip
(in) The stator input current
(ili) The stator input current if the machine is operated as a
generator with the same numerical slip obtained in (i).

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