EE2355 DESIGN OF ELECTRICAL MACHINES L T P C
3 1 0 4
To expose the students to the concept of design of various types of electrical machines
To provide sound knowledge about constructional details and design of various electrical
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.
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
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.
1. A.Shanmugasundaram, G.Gangadharan, R.Palani 'Electrical Machine Design Data
Book', New Age Intenational Pvt. Ltd., Reprint 2007.