NPTEL Syllabus
Electrical Machines -II - Video course
COURSE OUTLINE
Synchronous machines: types, windings, emf equation, generator and motor
NPTEL
operations, phasor diagrams; testing, power angle characteristic, v-curves,
stability; starting of synchronous motor.Analysis of salient pole synchronous
machines.
Single phase induction motor: Rotating and pulsating field, development of
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equivalent circuit based on double revolving field theory, torque-slip
characteristic, performance analysis; Starting by phase spliting; selection of
capacitor value for starting and running condtions.
Electrical
D.C machines: Construction, armature windings; emf and torque equations; Engineering
generator and motor mode of operations; armature reaction, commutation;
characteristics of D.C motors; starting, speed control and braking of D.C motor.
Pre-requisites:
COURSE DETAIL
MODULE - 1 General Concepts of Conventional Rotating Machines. 1. Electrical Technology.
Additional Reading:
Module Lec Topics
no. 1. Principles of Alternating-Current
Machinery by Ralph R. Lawrence
General McGraw-Hill, 1953.
Concepts of 1 Introduction, scope of the course. Types of rotating
Conventional machines- common underlying principle of operation. 2. Theory of Alternating of
Rotating Torque production due to interaction of two sets of Alternating Current Machinery by
Machines. magnets. A.S Langsdorf.
3. Electric Machine Theory for
Power Engineers by Van E.
2 Conditions to be fulfilled for production of steady Mablekos Harper & Row,
electromagnetic torque in conventional rotating Publishers, 1980.
machines. Concept of electrical & mechanical
degrees. 4. D-C and A-C Machines Based on
Fundamental Laws, by Michael
Liwschitz-Garik and Robert
3 Operation of machines as motor or generator. Concept T.Well Affiliated East-West Press
of loading a motor and generator. Pvt. Ltd. 1968.
5. Generalized theory of Electrical
Introduction Machine, by P.S.Bimhra.
to 4 Types of synchronous machines & their constructional
Synchronous features. Infinite bus & its concept.
machines. Coordinators:
Prof. T.K. Bhattacharya
5 Armature winding, winding factors for 60 ° and 120° Department of Electrical
phase spread windings.Expression for induced EngineeringIIT Kharagpur
voltage.
6 Field mmf, armature mmf and resultant mmf. Space
and time phasor diagrams for generator operation
under no load and load conditions.Synchronous
impedance.
Synchronous
Generators 7 Salient pole and non salient pole generators and their
(Alternators). uses in hydro and thermal power plants.
8 Different methods of synchronisation with the bus.
9 Complete phasor diagrams of non-salient pole
synchronous generators connected to infinite bus for
lagging , leading and upf loads. Regulation.
10 Equivalent circuit and estimation of regulation by
various methods viz. Synchronous impedance
method, zpf method.
11 Problem solving on regulation.
12 Expression for input and output power. Simplified
expression for power when armature resistance is
neglected. P- δ characteristic and operating point.
13 Circle diagram, O-curves and V-Curves and their
implications. Effect of excitation variation.
14 Stability of synchronous generator, Swing equation,
hunting and equal area criteria.
Synchronous
Motors. 15 Starting methods of synchronous motor: use of
damper bars.
16 Complete phasor diagrams under various power
factors and expression of power.
17 Circle diagram, O-curves and V-Curves and their
implications. Effect of excitation variation.
18 Stability of synchronous motor, Swing equation,
hunting and equal area criteria.
Salient pole
synchronous 19 Bondel's two reaction theory, direct axis and
motor & quadrature axis synchronous reactances.
generator.
20 Phasor diagrams under different power factor
conditions and expression for power for generator and
motor modes.
21 Reluctance power and phasor diagram with zero
excitation for generator and motor modes.
22 Slip test to estimate direct axis and quadrature axis
synchronous reactances.
23 Qualitative analysis of sudden short circuit
phenomenon of synchronous generator. Transient and
subtransient reactances.
Single phase
induction 24 General description of the motor and constructional
motor. features; Pulsating and Rotating fields.
25 Analysis of single phase motor based on double
revolvimg field theorem.
26 Devolopment of equivalent circuit and torque
expression.
27 Torque slip characteristic and its features.
28 Split phase induction motor incorporating starting
torque.
29 Selection capacitamce values for maximum torque.
D.C Machines.
30 Types of armature windings and parallel paths.
31 D,C generator; EMF equation and torque equation.
32 Shunt generator; voltage build up and load
characteristics.
33 Compound generator; problem solving.
34 D.C shunt motor and its starting.
35 Characteristics of shunt motors.
36 Speed control of shunt motor.
37 Braking of shunt motors: various methods.
D.C series motor and its characteristics
38 Speed control of D.C series motor.
39 Problem solving on D.C machines.
40 Conclusions of the course.
References:
1. Electric Machinery Fundamentals, by Stephen J. Chapman McGraw-Hill
International, 1991.
2. Electric Machinery A.E Fitzgerald and Charles Kingsley, 6th edition.
3. The performance & Design of A.C Machines by M.G Say.
4. Electric Machines and Power Systems by Vincet Del Toro Prentice-Hall,
1985.
5. Electrical Machinery by P.S.Bimhra 2000, Khanna publishers New Delhi.
6. Electrical Machines by J.Nagrath & D.P.Kothari.
7. The Performance and Design of AC. Commutator Motors by E. Openshaw
Taylor.
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