Content : Syllabus, Question Banks, Books, Lecture Notes, Important Part A 2 Marks Questions and Important Part B 16 Mark Questions, Previous Years Question Papers Collections.

EE6401 Electrical Machines – I (EM-I) Syllabus

UNIT I 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, Hysterisis and Eddy Current losses – AC excitation, introduction to permanent magnets-Transformer as a magnetically coupled circuit.
UNIT II 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 III ELECTROMECHANICAL ENERGY CONVERSION AND CONCEPTS IN ROTATING MACHINES
Energy in magnetic system – Field energy and coenergy-force and torque equations – singly and multiply excited magnetic field systems-mmf of distributed windings – Winding Inductances-, magnetic fields in rotating machines – rotating mmf waves – magnetic saturation and leakage fluxes.
UNIT IV 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 and interpoles – compensating winding –characteristics of DC generators.
UNIT V 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 motors(PMDC)-DC Motor applications.

EE6401 Electrical Machines – I (EM-I) Question Papers Collections

• Last 5 Years Anna University Question Papers Collection – DOWNLOAD

• Collection 2 – DOWNLOAD

• Collection 3 – DOWNLOAD

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