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SYLLABUS

Unit - 1 :

Magnetic Circuits and Magnetic Materials Magnetic circuits – Laws governing magnetic circuits – Flux linkage, Inductance and Energy – Statically and Dynamically induced EMF – Torque – Properties of magnetic materials, Hysteresis and Eddy current losses – AC excitation, Introduction to permanent magnets – Transformer as a magnetically coupled circuit.

Unit - 2 :

Transformers Construction – Principle of operation – Equivalent circuit parameters – Phasor diagrams, losses – Testing – Efficiency and Voltage regulation – All day efficiency – Sumpner’s test, Per unit representation – Inrush current – Three phase transformers – Connections – Scott connection – Phasing of transformer – Parallel operation of three phase transformers – Auto transformer – Tap changing transformers – Tertiary winding.

Unit - 3 :

Electromechanical Energy Conversion and Concepts in Rotating Machines Energy in magnetic system – Field energy and co energy – Force and torque equations – Singly and multiply excited magnetic field systems – Mmf of distributed windings – Winding inductances, Magnetic fields in rotating machines – Rotatiang mmf waves – Magnetic saturation and leakage fluxes.

Unit - 4 :

DC Generators Construction and components of DC machine – Principle of operation – Lap and wave windings – EMF equations – Circuit model – Armature reaction – Methods of excitation – Commutation – Interpoles compensating winding – Characteristics of DC generators.

Unit - 5 :

DC Motors Principle and operations – Types of DC Motors – Speed torque characteristics of DC motors – Starting and speed control of DC motors – Plugging, dynamic and regenerative braking – Testing and efficiency – Retardation test – Swinburne’s test and Hopkinson’s test – Permanent Magnet DC (PMDC) motors – Applications of DC motors.