Wednesday, June 13, 2012
EE2355 DESIGN OF ELECTRICAL MACHINES Syllabus EEE Sixth(6th) Semester - Anna University - Regulation 2008
EE2355 DESIGN OF ELECTRICAL
MACHINES L T
P C
3 1 0 4
AIM
To expose the students to the concept of design of
various types of electrical machines
.
OBJECTIVES
To provide sound knowledge about constructional details
and design of various electrical
machines.
i. To study mmf calculation and thermal rating of various
types of electrical machines.
ii. To design armature and field systems for D.C.
machines.
iii. To design core, yoke, windings and cooling systems
of transformers.
iv. To design stator and rotor of induction machines.
v. To design stator and rotor of synchronous machines and
study their thermal behaviour.
UNIT I INTRODUCTION 9
Major considerations in Electrical Machine Design -
Electrical Engineering Materials – Space factor –
Choice of Specific Electrical and Magnetic loadings -
Thermal considerations - Heat flow –
Temperature rise - Rating of machines – Standard
specifications.
UNIT II DC MACHINES 9
Output Equations – Main Dimensions - Magnetic circuit
calculations – Carter’s Coefficient - Net
length of Iron –Real & Apparent flux densities –
Selection of number of poles – Design of Armature –
Design of commutator and brushes – performance prediction
using design values.
UNIT III TRANSFORMERS 9
Output Equations – Main Dimensions - KVA output for
single and three phase transformers –
Window space factor – Overall dimensions – Operating
characteristics – Regulation – No load
current – Temperature rise in Transformers – Design of
Tank - Methods of cooling of Transformers.
UNIT IV INDUCTION MOTORS 9
Output equation of Induction motor – Main dimensions –
Length of air gap- Rules for selecting rotor
slots of squirrel cage machines – Design of rotor bars
& slots – Design of end rings – Design of
wound rotor -– Magnetic leakage calculations – Leakage
reactance of polyphase machines-
Magnetizing current - Short circuit current – Circle
diagram - Operating characteristics.
71
UNIT V SYNCHRONOUS MACHINES 9
Output equations – choice of loadings – Design of salient
pole machines – Short circuit ratio – shape
of pole face – Armature design – Armature parameters –
Estimation of air gap length – Design of
rotor –Design of damper winding – Determination of full
load field mmf – Design of field winding –
Design of turbo alternators – Rotor design.
TOTAL : 45 PERIODS
TEXT BOOKS
1. Sawhney, A.K., 'A Course in Electrical Machine
Design', Dhanpat Rai & Sons, New Delhi, 1984.
2. Sen, S.K., 'Principles of Electrical Machine Designs
with Computer Programmes', Oxford and
IBH Publishing Co. Pvt. Ltd., New Delhi, 1987.
REFERENCES
1. A.Shanmugasundaram, G.Gangadharan, R.Palani
'Electrical Machine Design Data
Book', New
Age Intenational Pvt. Ltd., Reprint 2007.
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