EE 9211 - ELECTRIC DRIVES AND CONTROL

UNIT - I: INTRODUCTION

Fundamentals of electric drives – advances of electric drive - characteristics of loads – different types of mechanical loads – Choice of an electric drive – control circuit components : Fuses, switches, circuit brakers, conductors, relay and control transformers.

UNIT - II: SPEED CONTROL OF DC MACHINES

DC shunt motors - Speed Torque characteristics – Ward Leonard method, DC series motor – series parallel control – solid state DC drives – Thyristor bridge rectifier circuits – chopper circuits.

UNIT - III: SPEED CONTROL OF AC MACHINES

Induction motor – Speed Torque Characteristics – Pole Changing, stator frequency variation – slip-ring induction motor – stator voltage variation – Rotor resistance variation, slip power recovery – basic inverter circuits – variable voltage frequency control.

UNIT - IV: MOTOR STARTERS AND CONTROLLERS

DC motor starters: using voltage sensing relays, current sensing relays and time delays – wound rotor induction motor starters – starters using frequency sensing relays – DOI – starter and auto transformer starter.

UNIT - V: HEATING AND POWER RATING OF DRIVE MOTORS

Load diagram, over load capacity, insulating materials, heating and cooling of motors, service condition of electric drive – continuous, intermittent and short time – industrial application.

TEXT BOOKS:

1. N.K. De and P.K.Sen, ‘Electric Drives’, Prentice Hall of India Private Ltd., 2002.

2.Vedam Subramanyam, Thyristor control of electric drives, Tata McGraw Hill Publishing Company Ltd., New Delhi 2007.

3. V.K.Mehta and Rohit Mehta, ‘ Principle of Electrical Engineering’, S.Chand & Company, 2008.

REFERENCES

1. S.K.Bhattacharya Brinjinder Singh, ‘ Control of Electrical Machines’, New Age International Publishers, 2002.

2. John Dird, ‘Electrical Circuit Theory and Technology’, Elseiver, First Indian Edition, 2006.