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Electrical machines I (II-EEE)

Course preview for "Electrical Machines I" at PITS, Thanjavur

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Electrical machines I (II-EEE)

  1. 1. R.SARAVANAN/Sr.LECT. DEPARTMENT OF EEE PARISUTHAM INSTITUTE OF TECHNOLOGY & SCIENCE
  2. 2. <ul><li>AIM </li></ul><ul><li>To expose the students to the basic principles of Electro mechanical Energy Conversion in Electrical Apparatus and the operation of Transformers and DC Machines. </li></ul>EE 1251-ELECTRICAL MACHINES-I Unit 1 Unit 2 Unit 3 Unit 4 Unit 5
  3. 3. <ul><li>OBJECTIVES </li></ul><ul><li>To familiarize the constructional details, the principle of operation, the methods of testing the transformers and three phase transformer connections. </li></ul><ul><li>To introduce the principles of electromechanical energy conversion in singly and multiply excited systems. </li></ul><ul><li>To study the working principles of electrical machines using the concepts of electromechanical energy conversion principles </li></ul><ul><li>To estimate the various losses </li></ul>EE 1251-ELECTRICAL MACHINES-I Unit 1 Unit 2 Unit 3 Unit 4 Unit 5
  4. 4. <ul><li>UNIT I        </li></ul><ul><li>     INTRODUCTION       </li></ul><ul><li>                                 </li></ul><ul><li>Electrical machine types </li></ul><ul><li>Magnetic circuits </li></ul><ul><li>Inductance </li></ul><ul><li>Statically and dynamically induced EMF </li></ul><ul><li>About Torque </li></ul><ul><li>  Core losses  </li></ul><ul><li>  AC operation of magnetic circuits </li></ul>EE 1251-ELECTRICAL MACHINES-I Unit 1 Unit 2 Unit 3 Unit 4 Unit 5
  5. 5. <ul><li>UNIT II     </li></ul><ul><li>TRANSFORMERS                                           </li></ul><ul><li>                                        </li></ul><ul><li>Construction </li></ul><ul><li>Equivalent circuit </li></ul><ul><li>Losses </li></ul><ul><li>Testing </li></ul><ul><li>Efficiency and voltage regulation </li></ul><ul><li>Auto transformer </li></ul><ul><li>Three phase connections </li></ul><ul><li>Parallel operation of transformers </li></ul><ul><li>Tap changing. </li></ul>EE 1251-ELECTRICAL MACHINES-I Unit 1 Unit 2 Unit 3 Unit 4 Unit 5
  6. 6. <ul><li>A transformer is a static machines . </li></ul><ul><li>The word ‘transformer’ comes form the word ‘transform’. </li></ul><ul><li>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. </li></ul><ul><li>It can be either to step-up or step down. </li></ul>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. 7. EE 1251-ELECTRICAL MACHINES-I Unit 1 Unit 2 Init 3 Unit 4 Unit 5
  8. 8. Transformer Construction <ul><li>Two types of iron-core construction: </li></ul><ul><ul><li>Core - type construction </li></ul></ul><ul><ul><li>Shell - type construction </li></ul></ul>EE 1251-ELECTRICAL MACHINES-I Unit 1 Unit 2 Unit 3 Unit 4 Unit 5
  9. 9. <ul><li>UNIT III         </li></ul><ul><li>ELECTROMECHANICALENERGY </li></ul><ul><li>CONVERSION    </li></ul><ul><li>  Energy in magnetic systems </li></ul><ul><li>Field energy </li></ul><ul><li>Coenergy and mechanical force </li></ul><ul><li>Singly excited systems </li></ul><ul><li>Multiply excited systems </li></ul>EE 1251-ELECTRICAL MACHINES-I Unit 1 Unit 2 Unit 3 Unit 4 Unit 5
  10. 10. Single Excited Electromagnetic System (cont.,) EE 1251-ELECTRICAL MACHINES-I Unit 1 Unit 2 Unit 3 Unit 4 Unit 5
  11. 11. Multiple excited EE 1251-ELECTRICAL MACHINES-I Unit 1 Unit 2 Unit 3 Unit 4 Unit 5
  12. 12. <ul><li>UNIT IV  </li></ul><ul><li>BASIC CONCEPTS INROTATING MACHINES  </li></ul><ul><li>   </li></ul><ul><li>Generated voltages in AC and DC machines </li></ul><ul><ul><li>MMF of distributed windings </li></ul></ul><ul><ul><li>Magnetic fields in rotating machines </li></ul></ul><ul><ul><li>Rotating MMF waves </li></ul></ul><ul><ul><li>Torque in AC and DC machines . </li></ul></ul>EE 1251-ELECTRICAL MACHINES-I Unit 1 Unit 2 Unit 3 Unit 4 Unit 5
  13. 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. 14. <ul><li>UNIT V </li></ul><ul><li>DC MACHINES                       </li></ul><ul><li>Construction </li></ul><ul><li>EMF and torque </li></ul><ul><li>Circuit model </li></ul><ul><li>Armature reaction </li></ul><ul><li>Commutation </li></ul><ul><li>Methods of excitation </li></ul><ul><li>Characteristics of generators </li></ul><ul><li>Characteristics of motors </li></ul><ul><li>Starting and speed control </li></ul><ul><li>Testing and efficiency </li></ul><ul><li>Parallel operation. </li></ul>EE 1251-ELECTRICAL MACHINES-I Unit 1 Unit 2 Unit 3 Unit 4 Unit 5
  15. 16. SEMINOR TOPICS <ul><ul><li>Statically and dynamically </li></ul></ul><ul><ul><li>induced EMF  </li></ul></ul><ul><ul><li>Principle of operation </li></ul></ul><ul><ul><li>Transformer Losses </li></ul></ul><ul><ul><li>Auto transformer Construction </li></ul></ul><ul><ul><li>Three phase connections </li></ul></ul><ul><ul><li>Tap changing. </li></ul></ul><ul><ul><li>Singly and multiply excited systems. </li></ul></ul><ul><ul><li>Types of Starters </li></ul></ul>
  16. 17. ASSIGNMENT TOPICS <ul><li>1. (i) Magnetic circuits & Inductance </li></ul><ul><li>(ii) Problems in inductance </li></ul><ul><li>2. (i) Equivalent circuit of transformer </li></ul><ul><li>(ii) Problems in OC & SC test </li></ul><ul><li>3. (i) Singly and multiply excited systems. </li></ul><ul><li>(ii) Torque in AC and DC machines v </li></ul><ul><li>  </li></ul><ul><li>4. (i) Methods of excitation </li></ul><ul><li>(ii) Starting and speed control </li></ul>
  17. 18. . <ul><li>. </li></ul>

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