Q4 (a) Outline the locked rotor and no load tests for an induction motor andindicate the necessary measurements and calculations to determineequivalent circuit parameters.(b)The per phase equivalent circuit parameters for a 3 phase, 4 pole starconnected induction machine operating off a 230 V (phase voltage), 50 Hzsupply are shown on Table Q4b. Assuming that friction and windage lossesare negligible, determine the following for operation at a slip of 0.025:(i)(ii)(iii)(iv)(v)(vi)The per phase equivalent circuit (including values below)The actual motor speed (rpm)The mechanical power (W)The torque (Nm)The motor losses (W)The motor efficiency (%)ParameterValueХм352R.1052R,0.22R,0.152Xeg1.50Table Q4b(c) Induction motors can also operate off 2 phase AC supplies. Outline thenecessary electrical supply and mechanical winding arrangements for thistype of motor.

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Outline the locked rotor and no load tests for an induction motor

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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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

Q4 (a) Outline the locked rotor and no load tests for an induction motor and
indicate the necessary measurements and calculations to determine
equivalent circuit parameters.
(b)
The per phase equivalent circuit parameters for a 3 phase, 4 pole star
connected induction machine operating off a 230 V (phase voltage), 50 Hz
supply are shown on Table Q4b. Assuming that friction and windage losses
are negligible, determine the following for operation at a slip of 0.025:
(i)
(ii)
(iii)
(iv)
(v)
(vi)
The per phase equivalent circuit (including values below)
The actual motor speed (rpm)
The mechanical power (W)
The torque (Nm)
The motor losses (W)
The motor efficiency (%)
Parameter
Value
Хм
352
R.
1052
R,
0.22
R,
0.152
Xeg
1.50
Table Q4b
(c) Induction motors can also operate off 2 phase AC supplies. Outline the
necessary electrical supply and mechanical winding arrangements for this
type of motor.

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