Three Phase Induction Motor

UNIT – III

Chapter – 5

Three Phase Induction Motor

Syllabus

Constructional details - Types of rotors - Principle of operation - Slip - Cogging and crawling - Equivalent circuit - Torque-Slip characteristics - Condition for maximum torque - Losses and efficiency. Double cage induction motors - Induction generators - Synchronous induction motor.

Contents

5.1     Introduction

5.2     Rotating Magnetic Field (R.M.F.)    

5.3     Concept of Slip Rings and Brush Assembly

5.4     Construction                 

5.5     Working Principle                  

5.6     Slip of Induction Motor         

5.7     Effect of Slip on Rotor Parameters

5.8     Induction Motor as a Transformer

5.9     Torque Equation           

5.10   Condition for Maximum Torque      

5.11   Torque-Slip Characteristics    

5.13   Speed - Torque Characteristics

5.14   Effect of Change in Rotor Resistance on Torque

5.15   Effect of Change in Voltage and Frequency        

5.16   Losses in Induction Motor

5.17   Power Flow in an Induction Motor  

5.18   Equivalent Circuit of Induction Motor      

5.19   Phasor Diagram of Induction Motor

5.20   Effect of Harmonics on Performance of 3 Phase Induction Motor .. Dec.-04, Marks 6

5.21   Applications                 

5.22   Special Rotor Constructions … Dec.-04, 06, 10, 14, 16,        .. May-06,10,13, Marks 8

5.23   Induction Generators .. May-06, 07, Dec.-10,16,17      Marks 8

5.24   Synchronous Induction Motor.         .. May-03, Dec.-14, Marks 8

5.25   Comparison of Synchronous and Induction Motor                

5.26   Two Marks Questions with Answers                  

5.27   University Questions with Answers (Long Answered Questions)