EE2355 DESIGN OF ELECTRICAL MACHINES SYLLABUS

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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.

 To study mmf calculation and thermal rating of various types of electrical

machines.

 To design armature and field systems for D.C. machines.

 To design core, yoke, windings and cooling systems of transformers.

 To design stator and rotor of induction machines.

 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.

L = 45 T = 15 TOTAL = 60 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.

2. ‘Electrical Machine Design', Balbir Singh, Brite Publications, Pune.