EE2251 ELECTRICAL MACHINES – I SYLLABUS

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AIM

To expose the students to the basic principles of Electro mechanical Energy

Conversion in Electrical Apparatus and the operation of Transformers and DC

Machines.

OBJECTIVES

i. To familiarize the constructional details, the principle of operation, prediction of

performance, the methods of testing the transformers and three phase transformer

connections.

ii. To introduce the principles of electromechanical energy conversion in singly and

multiply excited systems.

iii. To study the working principles of electrical machines using the concepts of

electromechanical energy conversion principles and derive expressions for

generated voltage and torque developed in all Electrical Machines.

iv. To study the working principles of DC machines as Generator and Motor, types,

determination of their no-load/load characteristics, starting and methods of speed

control of motors.

v. To estimate the various losses taking place in D.C. machines and to study the

different testing methods to arrive at their performance.

1. INTRODUCTION 6

Electrical machine types – Magnetic circuits – Inductance – Statically and Dynamically

induced EMF - Torque – Hysteresis- Core losses - AC operation of magnetic circuits.

2. TRANSFORMERS 10

Construction – principle of operation – equivalent circuit – losses – testing – efficiency

and voltage regulation – auto transformer – three phase connections – parallel operation

of transformers – tap changing.

3. ELECTROMECHANICAL ENERGY CONVERSION 9

Energy in magnetic systems – field energy, coenergy and mechanical force – singly and

multiply excited systems.

4. BASIC CONCEPTS IN ROTATING MACHINES 9

Generated voltages in ac and dc machines, mmf of distributed windings – magnetic

fields in rotating machines – rotating mmf waves – torque in ac and dc machines.

5. DC MACHINES 11

Construction – EMF and torque – circuit model – armature reaction – commutation –

methods of excitation – characteristics of generators – characteristics of motors –

starting and speed control – testing and efficiency – parallel operation.

L = 45 T = 15 Total = 60

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TEXT BOOK

1. Nagrath I. J and Kothari D. P. ‘Electric Machines’, Tata McGraw Hill

Publishing Company Ltd, 1990.

2. P.S. Bimbhra, ‘Electrical Machinery’, Khanna Publishers, 2003.

REFERENCES

1. Fitzgerald.A.E., Charles Kingsely Jr, Stephen D.Umans, ‘Electric

Machinery’, McGraw Hill Books Company, 1992.

2. P. C. Sen., ‘Principles of Electrical Machines and Power Electronics’,

John Wiley&Sons, 1997.

3. K. Murugesh Kumar, ‘Electric Machines’, Vikas publishing house Pvt Ltd,

2002.