Note for Design of Electrical Machines - DEM By handsome manoj

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EE2355 DESIGN OF ELECTRICAL MACHINES A Course Material on DESIGN OF ELECTRICAL MACHINES By Mr. P.MANIKANDAN ASSISTANT PROFESSOR DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING SASURIE COLLEGE OF ENGINEERING VIJAYAMANGALAM – 638 056 SCE 1 of 144 ELECTRICAL AND ELECTRONICS ENGINEERING

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EE2355 DESIGN OF ELECTRICAL MACHINES QUALITY CERTIFICATE This is to certify that the e-course material Subject Code : EE 2355 Scubject : DESIGN OF ELECTRICAL MACHINES Class : III Year EEE Being prepared by me and it meets the knowledge requirement of the university curriculum. Signature of the Author Name: Mr. P.MANIKANDAN Designation: This is to certify that the course material being prepared by Mr. P.Manikandan is of adequate quality. He has referred more than five books among them minimum one is from aborad author. Signature of HD Name: S.SRIRAM SEAL SCE 2 of 144 ELECTRICAL AND ELECTRONICS ENGINEERING

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EE2355 EE2355 MACHINES DESIGN OF ELECTRICAL MACHINES DESIGN OF ELECTRICAL 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 behavior. 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 TEXT BOOKS 1. Sawhney, A.K., 'A Course in Electrical Machine Design', DhanpatRai& 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. SCE 3 of 144 ELECTRICAL AND ELECTRONICS ENGINEERING

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EE2355 SLNO DESIGN OF ELECTRICAL MACHINES CONTENTS PAGE NO Abbreviations and Symbols UNIT I INTRODUCTION 7 15 1.1). Major considerations in Electrical Machine Design 15 1.2). Electrical Engineering Materials 16 1.3). Space factor 21 1.4). Choice of Specific Electrical and Magnetic loadings 21 1.5). Thermal considerations 24 1.6). Heat flow 25 1.7). Temperature rise 25 1.8). Rating of machines 26 1.9). Standard specifications. 26 QUESTION BANK 27-30 UNIT II DC MACHINES 33 2.1). Introduction 33 2.2). Output Equations 34 2.3). Main Dimensions 36 2.4). Magnetic circuit calculations 39 2.5). Carter’s Coefficient 40 2.6). Net length of Iron 40 2.7). Real & Apparent flux densities 41 2.8). Selection of number of poles 44 2.9). Design of Armature 46 2.10). Design of commutator and brushes 50 2.11). Performance prediction using design values. 51 QUESTION BANK UNIT III TRANSFORMERS SCE 53-57 58 3.1). Design features of power and distribution type transformers 58 3.2). Output Equations 58 3.3). Main Dimensions 61 3.4). KVA output for single and three phase transformers 63 3.5). Window space factor 63 4 of 144 ELECTRICAL AND ELECTRONICS ENGINEERING