ELECTRICAL MACHINES – II JNTUK-R19 AND R20 SYLLABUS

 ELECTRICAL MACHINES – II JNTUK-R19 AND R20 SYLLABUS:

UNIT-I:

1. phase induction motors

Construction  details   of   cage  and wound  rotor   machines – production  of rotating magnetic  field – principle of  operation   –  rotor emf  and   rotor  frequency  –   rotor  current and power  factor at standstill and during running conditions – rotor power input, rotor copper loss and mechanical  power  developed and   their   interrelationship – equivalent circuit – phasor  diagram

 

UNIT-II:

Characteristics, starting and testing methods of induction  motors

Torque equation – expressions for maximum torque and starting torque – torque   slip  characteristic –double cage and deep bar rotors – crawling and cogging – speed control of induction motor with V/f control method –no load and blocked rotor tests – circle diagram for predetermination of performance – methods of starting –starting current and torque calculations

• induction generator operation (Qualitative treatment only)

 

UNIT – III:

Single Phase Motors

Single phase induction motors – constructional features and equivalent circuit – problem of starting– double revolving field theory Starting methods, AC series motor.

 

UNIT–IV:

Construction, operation and voltage regulation of synchronous  generator

Constructional features of non-salient and salient pole type armature windings – distributed and concentrated windings – distribution, pitch and winding factors – E.M.F equation  –  improvements of waveform and armature reaction – voltage regulation by   synchronous  impedance method –MMF method and Potier triangle method – phasor diagrams – two reaction analysis of salient pole machines and phasor diagram.

Parallel operation with infinite bus and other alternators – synchronizing power – load sharing –

control of real and reactive power – numerical problems.

 

UNIT–V:

Synchronous motor – operation, starting and  performance

Synchronous motor principle and theory of operation – phasor diagram – starting torque – variation of current and power factor with excitation –synchronous condenser – mathematical analysis for power developed– hunting and its suppression – methods of starting –  applications.

 

Learning outcomes:

After the completion of the course the student should be able  to:

• explain the operation and performance of three phase induction  motor.
  • analyze the torque-speed relation, performance of induction motor and induction   generator.
    • explain design procedure for transformers and three phase induction  motors.
    • implement the starting of single phase induction motors.
    • perform winding design and predetermine the regulation of synchronous  generators.
      • avoid hunting phenomenon, implement methods of staring and correction of power factor with synchronous motor.

 

Text Books:

1. Electrical Machines by P.S. Bhimbra, Khanna Publishers
2. Electric Machinery by A.E.Fitzgerald,Charles kingsley,Stephen D.Umans,  TMH

 

Reference Books:

1. Electrical Machines by D. P.Kothari, I .J .Nagarth,Mc Graw Hill Publications, 4th   edition

1. Electrical Machines by R.K.Rajput, Lakshmi publications,5th  edition

1. Electrical Machinery by Abijith Chakrabarthi and Sudhipta Debnath, Mc Graw Hill education 2015
2. Electrical Machinery Fundamentals by Stephen J Chapman Mc Graw Hill education 2010

1. Electric Machines by Mulukutla S.Sarma&Mukesh k.Pathak, CENGAGE  Learning.
2. Theory & Performance of Electrical Machines by J.B.Guptha. S.K.Kataria &  Sons