Q4 (a)Sketch a typical torque vs speed curve for a high efficiency induction motorand indicate the following on the curve:(i) Synchronous speed(ii) Starting torque(iii) Breakdown torque(iv) A typical fan type load(b) The per phase equivalent circuit parameters for a 3 phase, 6 pole starconnected induction machine operating off a 230V (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 0.03:(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 (%)ValueParameterХм1502R.4002Rs0.62R,0.452Xeq20Table Q4b(c) Outline with the aid of a diagram an inverter driven variable speed inductionmotor drive from a fixed frequency 3 phase AC supply. Describe the basicinverter control requirements to achieve variable speed operation, and sketchtypical torque speed curves.

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Sketch a typical torque vs speed curve for a high efficiency 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)
Sketch a typical torque vs speed curve for a high efficiency induction motor
and indicate the following on the curve:
(i) Synchronous speed
(ii) Starting torque
(iii) Breakdown torque
(iv) A typical fan type load
(b) The per phase equivalent circuit parameters for a 3 phase, 6 pole star
connected induction machine operating off a 230V (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 0.03:
(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 (%)
Value
Parameter
Хм
1502
R.
4002
Rs
0.62
R,
0.452
Xeq
20
Table Q4b
(c) Outline with the aid of a diagram an inverter driven variable speed induction
motor drive from a fixed frequency 3 phase AC supply. Describe the basic
inverter control requirements to achieve variable speed operation, and sketch
typical torque speed curves.

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