Synchronous Motor

UNIT – II

Chapter - 4

Synchronous Motor

Syllabus

Principle of operation - Torque equation - Operation on infinite bus bars - V and inverted V - curves - Power input andpower developed equations - Starting methods - Current loci for constant power input, Constant excitation and constant power developed - Hunting - Natural frequency of oscillations - Damper windings - Synchronous condenser.

Contents            

4.1 Introduction            

4.2 Rotating Magnetic Field             

4.3 Construction of Three Phase Synchronous Motor           

4.4 Principle of Working         Dec.-07, 17          Marks 8

4.5 Why Synchronous Motor is Not Self Starting ?.. Dec.-05, May-12     Marks 5

4.6  Procedure to Start a Synchronous Motor     May-07,16, Dec.-05, 07, 10 Marks 5

4.7 Methods of Starting Synchronous Motor      .. May-07,16, Dec.-05,07,10,12, .. 16,17          Marks 16

4.8 Behaviour of Synchronous Motor on Loading...... May-07,13, Dec.-09,12,17 Marks 10

4.9 Analysis of Phasor Diagram                

4.10 Operation of Synchronous Motor at Constant Load Variable Excitation    .. May-09, 10, 12, 13,14,16,18 .. Dec.-07,11,16 Marks 13

4.11 V-Curves and Inverted V-Curves       .. May-06, 07, 09, 10,11,16,17 ..  Dec.-07,10,11,12,13,14,15,16,        Marks 8

4.12 Expression for Back E.M.F. or Induced E.M.F. per Phase in   Synchronous Motor (Ebph) .. Dec.-08,10,13,15, .. May-07, 09,11,16,          Marks 8

4.13 Power Flow in Synchronous Motor .. May-14, Dec.-14 

4.14 Alternative Expression for Power Developed by a Synchronous Motor .. Oct.-97, April-01, .. May-06, 08, 09, 12,13,17,18   .. Dec.-09,13,15,  Marks 16

4.15 Two Reaction Theory for Synchronous Motor              

4.16 Blondel Diagram [Constant Power Circle]             .. Dec.-08,14,17 Marks 8

4.17 Hunting in Synchronous Motor                   .. May-06, 08,11, Marks 8

4.18 Time Period of Oscillation                 

4.19 Synchronous Condensers                   .. Dec.-09,17, May-09,11, Marks 12

4.20 Features of Synchronous Motor                  .. Dec.-09, May-10, Marks 6

4.21 Applications of Three Phase Synchronous Motor         

4.22 Two Marks Questions with Answers          

4.23 University Questions with Answers (Long Answered Questions)