SOLID STATE DRIVES

UNIT I - DRIVE CHARACTERISTICS Electric drive - Equations governing motor load dynamics - steady statestability - multi quadrant Dynamics: acceleration, deceleration, starting &stopping - typical load torque characteristics - Selection of motor.UNIT II - CONVERTER / CHOPPER FED DC MOTORDRIVESteady state analysis of the single and three phase converter fed separatelyexcited DC motor drive- continuous conduction -Time ratio and current limitcontrol - 4 quadrant operation of converter / chopper fed drive-Applications.UNIT III - INDUCTION MOTOR DRIVESStator voltage control-V/f control- Rotor Resistance control-qualitativetreatment of slip power recovery drives-closed loop control-- vector control-Applications.UNIT IV - SYNCHRONOUS MOTOR DRIVESV/f control and self-control of synchronous motor: Margin angle control andpower factor control - Three phase voltage/current source fed synchronousmotor- Applications.UNIT V - DESIGN OF CONTROLLERS FOR DRIVESTransfer function for DC motor / load and converter - closed loop controlwith Current and speed feedback-armature voltage control and fieldweakening mode - Design of controllers; current controller and speedcontroller- converter selection and characteristics.