Electrical Machine-II1. Unit-1
2. Unit-2
3. Unit-3
4. Unit-4
5. Unit-5
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Electrical Machine-II SyllabusUNIT I: Electrical Machines Principles Principle of electromechanical energy conversion. Construction of various rotating machines. Singly excited magnetic system, co-energy and field energy. Doubly excited magnetic system. Torque expression for reluctance motor MMF of concentrated and distributed windings, EMF equation, winding factors, torque and voltage in salient and non-salient pole machines, coupled circuit and magnetic field view point, rotating magnetic fields, torque production in synchronous, induction and DC machines. UNIT II: Synchronous Machines I Theory of non-salient pole synchronous machines, basic synchronous machine models, equivalent circuit and phasor diagrams of synchronous machines, saturation effects, armature reaction, open circuit, short circuit and zero power factor lag tests on synchronous machines, synchronous reactance, SCR, voltage regulation of alternators by synchronous impedance, MMF and zero power factor method, excitation systems of alternators UNIT III: Synchronous Machines II Generator input and output, steady state power angle characteristics, parallel operation of synchronous machines, load sharing, operation of synchronous machines with infinite bus bars, synchronizing torque, active and reactive power flows, general load diagram, V-curves. UNIT IV: Synchronous Machines III Theory of salient pole synchronous machines, two-reaction theory, phasor diagram, power angle characteristics, determination of Xd and Xq, stiffness of coupling synchronous motors, phasor diagrams, starting of synchronous machines, damper winding. UNIT V: Polyphase Induction Machines Cage and slip-ring induction motors, equivalent circuit, phasor diagram, normalized torque-speed (slip) relationship, starting and speed control of induction motors, cogging and crawling, double cage induction motors, testing of induction motors, circle diagram. |