EE8301 – NOTES & QP
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EE8301 – 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, Hysteresis 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 co energy-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 excitationcommutation — interpoles compensating winding –characteristics of DC generators.
UNIT V DC MOTORS
Principle and operations — types of DC Motors — Speed Torque Characteristics of DC Motorsstarting and speed control of DC motors –Plugging, dynamic and regenerative brakingtesting and efficiency — Retardation test- Swinburne?s test and Hopkinson?s test — Permanent Magnet DC (PMDC)motors-applications of DC