ANNA University Electrical Machines – I Notes
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Syllabus:
UNIT II 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.
UNIT III ELECTROMECHANICAL ENERGY CONVERSION 9
Energy in magnetic systems – field energy, coenergy and mechanical force – singly and multiply excited systems.
UNIT IV 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.
UNIT V 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.
Syllabus:
UNIT I INTRODUCTION 6
Electrical machine types – Magnetic circuits – Inductance – Statically and Dynamically induced EMF - Torque – Hysteresis- Core losses - AC operation of magnetic circuits.
Electrical machine types – Magnetic circuits – Inductance – Statically and Dynamically induced EMF - Torque – Hysteresis- Core losses - AC operation of magnetic circuits.
UNIT II 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.
UNIT III ELECTROMECHANICAL ENERGY CONVERSION 9
Energy in magnetic systems – field energy, coenergy and mechanical force – singly and multiply excited systems.
UNIT IV 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.
UNIT V 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.
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