EE154 Electrical Machine Design

EE154 Electrical Machine Design L-T-P-Cr: 3 - 0 -0-3 Objective: To learn design of different type of electrical machine Pre-requisite: DC Machines and Transformers, Synchronous and Induction Machines Outcome: Students will be able to design different type of electrical machines Syllabus: Unit 1. Introduction: Major considerations in Electrical Machine Design-Electrical Engg. Materials-Space factor-Choice of specific Electrical and Magnetic loadings- Thermal considerations – Heat flow –Temperature rise-Rating of machines-Standard specification 6 Lecture Unit 2. DC Machines: Output Equations- Main dimensions- Magnetic circuit calculations Carter’s co-efficient- Net length of iron- Real and apparent flux density –Selection of number of poles-Design of armature-Design of commutator and brushes - Performance prediction using design values. 8 Lecture Unit 3. Transformer: 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 8 Lecture Unit 4. Induction Motors: Output equation of induction motor –Main dimensions-Length of induction motor- Main dimensions –Length of air gap-Rules for selecting rotor slots of squirrel cage machines-Design of rotor bars and 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 10 Lecture Unit 5. Synchronous Machines: Output equations-Choice of loadings –Design of salient pole machines-Short circuit ratio-Shape of pole face-Armature design-Armature parameters-Equation of ear 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 10 Lecture Suggested Readings 1. Sawhney, A.K., “A course in Electrical Machine Design”, Dhanpat Rai & Sons, New Delhi, 1996. 2. Albert E. Clayton and Hancock,N.N, “The performance and Design of Direct Current Machines”, Oxford & IBH Publishing Co., Pvt., Ltd., New Delhi, 1990 3. Say, M.G., “Alternating Current Machines”, ELBS & Pitman, London, 5th edition, 1992. 4. Ion Boldea & Syed A Nasar, Induction Machines Design handbook, CRC Pressf 5. Rai, H.M., “Principles of Electrical Machine Design”, Sathyaprakashan , New Delhi, 4th Edition, 1995. 6. Shanmugasundaram A., “Electrical Machine Design Data Book”, Wiley Eastern Ltd, 1989. 7. M. Ramamurthy – Computer aided Design of Electrical Equipment, East_West Press Pvt. Ltd. Madras, 1988.