EE 2251 ELECTRICAL MACHINES – I lecture notes | for EEE - IV semester | by R.Anirudhan
download link 1: "electrical machines -I" (transformers)
download link 2: "electrical machines -I" (d.c. machines)
download link 3: "electrical machines -I" (introduction,basic types etc..)
UNIT I INTRODUCTION
Electrical machine types – Magnetic circuits – Inductance – Statically and Dynamically induced EMF
- Torque – Hysteresis- Core losses - AC operation of magnetic circuits.
UNIT II TRANSFORMERS
Construction – principle of operation – equivalent circuit – losses – testing – efficiency and voltage
regulation – auto transformer – three phase connections – parallel operation of transformers – tap
UNIT III ELECTROMECHANICAL ENERGY CONVERSION
Energy in magnetic systems – field energy, coenergy and mechanical force – singly and multiply
UNIT IV 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.
UNIT V 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.