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UNIT 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.
Text Books:
1. Electrical Machines by Smarajit Ghosh, Pearson Education
2. Performance & Design of A.C. Machines by M.G. Say, C.B.S. Publishers
Reference Books:
1. Electric Machines by Nagrath & Kothari, TMH Pbs.
2. Electric Machines by P.K. Mukherjee & S.Chakravarti, Dhanpat Rai
3. Electrical machines by B. R, Gupta, New age international.
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.
Text Books:
1. Electrical Machines by Smarajit Ghosh, Pearson Education
2. Performance & Design of A.C. Machines by M.G. Say, C.B.S. Publishers
Reference Books:
1. Electric Machines by Nagrath & Kothari, TMH Pbs.
2. Electric Machines by P.K. Mukherjee & S.Chakravarti, Dhanpat Rai
3. Electrical machines by B. R, Gupta, New age international.
