SNS COLLEGE OF ENGINEERING (Accredited by NAAC-UGC with A Grade, Approved by AICTE, Recognized by UGC and Affiliated to Anna University, Chennai) COIMBATORE 641 107 DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING DESIGN OF ELECTRICAL MACHINES (EE 6604) III YEAR / VI SEMESTER B.E. EEE ACADEMIC YEAR 2016-17 (EVEN SEMESTER) DESIGN OF ELECTRICAL MACHINES AN OVERVIEW Mr.R.B.SELVAKUMAR ASSISTANT PROFESSOR DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING SNS COLLEGE OF ENGINEERING, COIMBATORE rbsk.snsce@gmail.com Mobile : 9942483127 Objectives Design and Engineering Scope for Electrical Machine Design Course Description 1 2/45 3/45 4/45 1
Non-road Transport 6% Other NonTransport 4% Fuel Combustion for others 12% Electricity Generation and Heating 44% Road Transport (Cars, Trucks and Buses) 16% Manufacturing and Construction 18% 5/45 Major Contributors Thermal and Nuclear Power Plants Industrial & Transportation Sector 6/45 1 Unit of Energy Conserved = 4 Units of Energy Generated 7/45 8/45 2
>50% of Generated Electricity is consumed by Motor Loads Electric Motor Loads CO 2 Emission Energy Efficiency Industry Climate Change Energy Conservation Design Optimization -Quality, Size, Weight, Durability, Cost Electricity Generation 9/45 10/45 Climate Change CO 2 Emission Electricity Generation Industry Electric Motor Loads Energy Conservation Energy Efficiency Design Optimization -Quality, Size, Weight, Durability, Cost Engineering is the economical application of to practical design problems. 11/45 12/45 3
What is Engineering is the economical application of scientific principles to practical design problems. Physical Realization of Theoretical Concepts Example? 13/45 14/45 COURSE WEBSITE www.snscourseware.org 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. 15 16 4
COURSE OUTCOMES Summarize the design considerations and constructional details of various Electrical Machines. Predict the performance of DC machine using design values. Design the overall dimensions and parts of Single Phase and Three Phase Transformers. Estimate the performance and design parameters of Induction Motors. Calculate the design parameters of Synchronous Machines. TEXT BOOKS 1. Sawhney, A.K., 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. 3. M.V.Deshpande, Design and Testing of Electrical Machines. 17 18 UNIT-I INTRODUCTION UNIT-II DC MACHINES Major considerations in Electrical Machine Design Electrical Engineering Materials Space factor Choice of Specific Electric and Magnetic loadings Thermal considerations Heat flow Temperature rise Rating of machines Standard specifications 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 19 20 5
UNIT-III TRANSFORMERS UNIT-IV INDUCTION MOTORS 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 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 21 22 UNIT-V SYNCHRONOUS MACHINES 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 THANK YOU 23 24/45 6