Electrical Engineering Department
Syllabus for Mid Semester
SUBJECT: AC Machines (4th
Sem )
SUBJECT CODE: 2140906
1. Poly-phase Induction
Motor:
Construction, Types of motor,Working principle, Rotating magnetic field.
Operating parameters at different load, No-load & blocked rotor test, Equivalent
circuit, Phasor diagram, Circle diagram, Efficiency and slip scale with the
help of circle diagram, Effect of rotor resistance on performance of motor,
Double cage motor and its equivalent circuit, Introduction to machine
dynamics. Starters of poly-phase
induction motor including soft starter, Methods of speed control of 3- phase motor,
Schematic diagram and advantages of Variable Voltage Variable Frequency drive.
Electrical transients in induction machine, Magnetic levitation: Principle,
advantages and application of linear induction motor. Effect of harmonics, Harmonic
torques, Cogging & Crawling, Effect of unbalanced voltages on performance
of motor. Performance of motor with variable voltage and frequency. Testing of
induction motor as per IS, Energy efficient motors.
2. Synchronous
Machines:
Construction, Types, Applications, Working principle. Equation of
induced emf with and without harmonics in MMF, pitch factor and distribution factor, MMF of distributed windings,
Torque equation, Machine efficiency, Armature
reaction and its compensation, Short circuit
ratio, Effect of change in excitation, Effect of change in torque and speed, Voltage regulation, Determination of voltage regulation
by Synchronous impedance method, MMF method, ZPF method and AIEE method, Synchronization : Importance and Methods of synchronization. Operating characteristic, Load angle
and Power flow equations, Capability curves,
Two reaction model of Salient pole machines,
Parallel operation, Load sharing between parallel connected generators, Effect of unequal voltages & unequal
percentage impedance, Governor
characteristics, Introduction to single phase generators,
Slip test for measurement of direct axis and quadrature axis reactance for salient pole machine, Sudden short circuit of
Synchronous machine, Hunting of synchronous
machines and its prevention.
EXAMPLES RELATED TO ABOVE
TOPICS
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