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EE 2251 ELECTRICAL MACHINES – I EE2251 ELECTRICAL MACHINES – I




EE 2251 ELECTRICAL MACHINES – I  SYLLABUS 3 1 0 4
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
27
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(VISIT   http://aimforhigh.blogspot.com)
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.

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