Electric drive – Equations governing motor load dynamics – steady state stability – multi quadrant Dynamics: acceleration, deceleration, starting & stopping – typical load torque characteristics – Selection of motor.
UNIT II CONVERTER / CHOPPER FED DC MOTOR DRIVE
Steady state analysis of the single and three phase converter fed separately excited DC motor drive–continuous and discontinuous conduction– Time ratio and current limit control – 4 quadrant operation of converter / chopper fed drive.
UNIT III INDUCTION MOTOR DRIVES
Stator voltage control–energy efficient drive–v/f control–constant airgap flux–field weakening mode – voltage / current fed inverter – closed loop control.
UNIT IV SYNCHRONOUS MOTOR DRIVES
V/f control and self control of synchronous motor: Margin angle control and power factor control – permanent magnet synchronous motor.
UNIT V DESIGN OF CONTROLLERS FOR DRIVES
Transfer function for DC motor / load and converter – closed loop control with Current and speed feedback–armature voltage control and field weakening mode – Design of controllers; current controller and speed controller- converter selection and characteristics.
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