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COURSE OUTLINES

AC MACHINES & DRIVES

4TH SEMESTER

Prof. Engr. Abdul Hameed

Prof. Engr. Riaz Ahmad1

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Basic Information

Course Code: EE 2254

Course Title: A.C. Machines and Drives

Program: BSEESemester: Fourth

Credit Hours: 3 + 1

Total Sessions: 32Teachers: Prof. Abdul Hameed

& Rana Riaz Ahmad

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Objectives

After completing this course, you should be ableto:

Understand the basic concepts and practicalknowledge of AC Machines and Drives.

Understand machines operation, identifyelectromechanical problems and to rectify

them. Learn about the latest industry trends,

standards and research issues related to thecourse contents.

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Teaching-Learning Methodology

Lectures

Handouts

Recommended text Reference text

Skills Development Exercises

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Suggested Text Books

Electric Machinery Fundamentals, 4th

Edition, Stephen J. Chapman

Electric Machines, Theory, Operation,

Applications, Adjustment, and Control, 2nd

Edition, Charles I. Hubert

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Reference Books

Electrical Machines, Smarajit Ghosh

Principles of Electrical Machines,V.K. Mehta & Rohit Mehta

Basic Electrical Engineering, 2nd Edition,

V N Mittle & Arvind Mittal

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Week # 2, Lecture # 3 & 4

EMF equation of synchronous generator

Armature windings and terminology

Stator electrical frequency

Synchronous generator on load

Equivalent circuit

Phasor diagrams at unity, lagging and leading

power factors Control of V, f, I and N of an alternator

Problems

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Week # 3, Lecture # 5 & 6 Power-flow diagram of an alternator

Magnetization curve

Approximate output power and torque of an

alternator Static Stability limit of an alternator

Losses in an alternator

Measurement of synchronous generator model

parameters

Measurement of synchronous reactance

Short circuit ratio

Problems 10

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Week # 4, Lecture # 7 & 8

Voltage regulation and its measurement

Synchronization systems

Synchronous power and torque Hunting of an alternator

Harmonics in an alternator

Problems

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Week # 5, Lecture # 9 & 10

Synchronous generator working alone

Parallel operation of synchronous generators

Load distribution among alternators Problems

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Week # 6, Lecture # 11 & 12

Power factor of an alternator

Cooling systems

Alternator ratings Winding insulation

Speed drop of prime mover

Problems

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Week # 7, Lecture # 13 & 14

X-tics of Synchronous Motor

Advantages

Disadvantages

Applications Principle of operation

Construction

Starting methods

Losses Efficiency

Problems

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Week # 8, Lecture # 15 & 16

Equivalent Circuits

Phasor diagrams

Power and Torque equations Synchronous Condenser

Problems

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Week # 9, Lecture # 17 & 18

Introduction of 3- phase induction motor

Advantages

Disadvantages

Applications Construction

Working principle

Rotating magnetic field due to 3-phase currents

The speed of rotating magnetic field

The concept of rotor slip

The rotor current frequency

Problems.

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Week # 10, Lecture # 19 & 20

The effect of slip on rotor circuit

The circuit of induction motor at standstill andat any slip,

Starting torque Condition fore maximum starting torque

Effect of change of supply on starting torque

EMF equations of induction motor,

Torque under running conditions Maximum torque under running conditions

Problems.

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Week # 11, Lecture # 21 & 22

Torque slip characteristics

Relation between full-load starting andmaximum torque

Comparison between induction motorand Transformer

Power factor of induction motor

Power stages in an induction motor

Losses in an induction motor Efficiency

Problems

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Week # 12, Lecture # 23 & 24

The equivalent circuit of an induction motor

Equivalent circuit of the rotor

Transformer equivalent circuit of aninduction motor

Approximate equivalent circuit

Performance curves of squirrel cage motor Starting methods of an induction motor

Problems

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Week # 13, Lecture # 25 & 26

Speed control of induction motors

Torque slip characteristics

No-load test Short circuit test

Problems

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Week # 14, Lecture # 27 & 28

Double squirrel cage motors

Equivalent circuit of double squirrel cage

induction motor Induction motor ratings

Problems

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Week # 15, Lecture # 29 & 30

Comparison of squirrel cage and slip ring

motor

Induction motor ratings

Faults in induction motors

Protection

Problems

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Week # 16, Lecture # 31 & 32

Double-field revolving theory of single-phaseinduction motors,

Construction

Operation and Characteristics of :(i) Split-phase motor

(ii) Capacitor start motors

(iii) Shaded-pole motor

(iv) Synchronous Reluctance motor

(v) Synchronous Reluctance motor

Problems

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