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Detailed Syllabus
ELECTRICAL MACHINES-II
MODULE-I (10 HOURS)
Fundamental Principles of A.C. Machines: E.M.F. equation of an elementary alternator, Single & three Phase,
relation between speed & frequency, factors affecting the induced e.m.f., full pitch & fractional pitch windings,
winding factors, armature reaction, the rotating field leakage reactance. Concept of time phasor & space phasor.
Synchronous Generator: Various types & construction, cylindrical rotor theory, phasor diagram, open circuit
& short circuit characteristics, armature reaction reactance, synchronous reactance, SCR, load characteristics,
potier reactance, voltage regulation, EMF method, MMF method, modified MMF method, ZPF method, power
angle characteristics.
MODULE-II (10 HOURS)
Theory of salient pole machine: Blondel’s two reaction theory, phasor diagram, direct axis and quadrature
axis synchronous reactances, power angle characteristics, Slip Test. Parallel operation: Synchronising method,
effect of wrong synchronising, load sharing between alternators in parallel. Sudden Short Circuit of a Synchronous
Generator, Transient and Sub-transient reactances. Synchronous Motor: General Physical consideration, torque
and power relations in non-salient pole and salient pole motors, V-curves & inverted V-curves, Effect of change
of excitation, synchronous condenser, starting of Synchronous Motor, performance characteristics, of synchronous
motor. Hunting, Synchronous Induction motor.
MODULE-III (10 HOURS)
Three Phase Induction Motors: Types, Construction and principle of operation, 3 phase Induction Motor,
general phasor diagram, equivalent circuit, power and torque relations, condition for maximum torque, circle
diagram, Performance characteristics, effect of rotor resistance on speed torque characteristics, stable & unstable
region of operation, Operation with unbalanced supply voltage. Starting: Starting of 3 phase induction motors,
high starting torque motors, speed control, rheostatic method, pole changing method cascade control of
speed, Double cage induction motor, Cogging and Crawling of Induction motor, induction generator
MODULE-IV (10 HOURS)
Single phase induction motor, theory of operation (Double revolving field theory, equivalent circuit,
Determination of parameters) Methods of starting, split phase starting, Repulsion starting, shaded pole
starting, performance characteristics. Single phase series motor, theory of operation performance and application,
Shcrage motor, Universal Motor.