EE2251 ELECTRICAL MACHINES – I

INTRODUCTION

Electrical machine types – Magnetic circuits – Inductance – Statically and Dynamically induced EMF - Torque – Hysteresis- Core losses - AC operation of magnetic circuits.

TRANSFORMERS

Construction – principle of operation – equivalent circuit – losses – testing – efficiency and voltage regulation – auto transformer – three phase connections – parallel operation of transformers – tap changing.

ELECTROMECHANICAL ENERGY CONVERSION

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

BASIC CONCEPTS IN ROTATING MACHINES

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.

DC MACHINES

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.

REFERENCE

Text Books

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.

Reference Books

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.