Lecture Notes–Electrical Machine-II [BEE 1401] Part-I
Department of Electrical Engineering,
Veer Surendra Sai University of Technology, Orissa, Burla, India
Syllabus of Bachelor of Technology in Electrical Engineering, 2010
ELECTRICAL MACHINES-II (3-1-0)
Subject Code: BEE 1401
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
. M. G. Say, “Performance and design of AC machines”, CBS Publishers.
. A. E. Fritzgerald, C. Kingsley, and S. Umans, “Electric Machinery”, MGH Publisher.
. I. J. Nagrath, D. P. Kothari, “Electric Machines”, TMH Publishers.
. A. S. Langsdorf, “Theory of Alternating Current Machinery”, TMH Edition.
. E. O. Taylor, “The Performance
Veer Surendra Sai University of Technology, Burla