This document outlines the syllabus for an Electrical Machines course. The course aims to teach students the basic principles of electromechanical energy conversion and the operation of transformers and DC machines. The syllabus covers 5 units - introduction to electrical machines, transformers, electromechanical energy conversion, basic concepts in rotating machines, and DC machines. Key topics include transformer construction, operation, and testing, principles of single and multiple excitation, torque production in AC and DC machines, and characteristics and control of DC generators and motors.

1. R.SARAVANAN/Sr.LECT. DEPARTMENT OF EEE PARISUTHAM INSTITUTE OF TECHNOLOGY & SCIENCE

2. AIM To expose the students to the basic principles of Electro mechanical Energy Conversion in Electrical Apparatus and the operation of Transformers and DC Machines. EE 1251-ELECTRICAL MACHINES-I Unit 1 Unit 2 Unit 3 Unit 4 Unit 5

3. OBJECTIVES To familiarize the constructional details, the principle of operation, the methods of testing the transformers and three phase transformer connections. To introduce the principles of electromechanical energy conversion in singly and multiply excited systems. To study the working principles of electrical machines using the concepts of electromechanical energy conversion principles To estimate the various losses EE 1251-ELECTRICAL MACHINES-I Unit 1 Unit 2 Unit 3 Unit 4 Unit 5

4. UNIT I INTRODUCTION Electrical machine types Magnetic circuits Inductance Statically and dynamically induced EMF About Torque Core losses AC operation of magnetic circuits EE 1251-ELECTRICAL MACHINES-I Unit 1 Unit 2 Unit 3 Unit 4 Unit 5

5. UNIT II TRANSFORMERS Construction Equivalent circuit Losses Testing Efficiency and voltage regulation Auto transformer Three phase connections Parallel operation of transformers Tap changing. EE 1251-ELECTRICAL MACHINES-I Unit 1 Unit 2 Unit 3 Unit 4 Unit 5

6. A transformer is a static machines . The word ‘transformer’ comes form the word ‘transform’. Transformer is not an energy conversion device , but is a device that changes AC electrical power at one voltage level into AC electrical power at another voltage level through the action of magnetic field, without a change in frequency. It can be either to step-up or step down. EE 1251-ELECTRICAL MACHINES-I Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Generation Station Distributions T ransmission System 33/13.5kV 13.5/6.6kV 6.6kV/415V Consumer

7. EE 1251-ELECTRICAL MACHINES-I Unit 1 Unit 2 Init 3 Unit 4 Unit 5

8. Transformer Construction Two types of iron-core construction: Core - type construction Shell - type construction EE 1251-ELECTRICAL MACHINES-I Unit 1 Unit 2 Unit 3 Unit 4 Unit 5

9. UNIT III ELECTROMECHANICALENERGY CONVERSION Energy in magnetic systems Field energy Coenergy and mechanical force Singly excited systems Multiply excited systems EE 1251-ELECTRICAL MACHINES-I Unit 1 Unit 2 Unit 3 Unit 4 Unit 5

10. Single Excited Electromagnetic System (cont.,) EE 1251-ELECTRICAL MACHINES-I Unit 1 Unit 2 Unit 3 Unit 4 Unit 5

11. Multiple excited EE 1251-ELECTRICAL MACHINES-I Unit 1 Unit 2 Unit 3 Unit 4 Unit 5

12. UNIT IV BASIC CONCEPTS INROTATING MACHINES Generated voltages in AC and DC machines MMF of distributed windings Magnetic fields in rotating machines Rotating MMF waves Torque in AC and DC machines . EE 1251-ELECTRICAL MACHINES-I Unit 1 Unit 2 Unit 3 Unit 4 Unit 5

13. Magnetic Flux in DC machines  f /2 rotor stator I f S N V f + - . . . . . . x x x x x x Armature Winding I f  a

14. UNIT V DC MACHINES Construction EMF and torque Circuit model Armature reaction Commutation Methods of excitation Characteristics of generators Characteristics of motors Starting and speed control Testing and efficiency Parallel operation. EE 1251-ELECTRICAL MACHINES-I Unit 1 Unit 2 Unit 3 Unit 4 Unit 5

16. SEMINOR TOPICS Statically and dynamically induced EMF Principle of operation Transformer Losses Auto transformer Construction Three phase connections Tap changing. Singly and multiply excited systems. Types of Starters

17. ASSIGNMENT TOPICS 1. (i) Magnetic circuits & Inductance (ii) Problems in inductance 2. (i) Equivalent circuit of transformer (ii) Problems in OC & SC test 3. (i) Singly and multiply excited systems. (ii) Torque in AC and DC machines v 4. (i) Methods of excitation (ii) Starting and speed control

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