Unit I – INTRODUCTION TO AC DRIVES (Download Notes)
Introduction to motor drives, torque production, equivalent circuit analysis, speed torque characteristics with variable voltage operation, variable frequency operation, constant V/F operation,induction motor characteristics in constant torque and field weakening regions.
Unit II – CONTROL OF INDUCTION MOTOR DRIVES AT STATOR SIDE
Scalar control, voltage fed inverter control, open loop volts/Hz control, speed control slip regulation, speed control with torque and flux control, current controlled voltage fed inverter drive, current fed inverter control, independent current and frequency control, speed and flux control in current fed inverter drive volts/hertz control, current fed inverter drive efficiency optimization control by flux program.
Unit III – CONTROL OF INDUCTION MOTOR AT ROTOR SIDE
Slip power recovery drives, Static Kramer drive phasor diagram,torque expression, speed control of Kramer drive, static Scheribus drive, modes of operation.
Unit IV – VECTOR CONTROL OF INDUCTION MOTOR DRIVES
Principles of vector control, vector control methods, direct method of vector control, adaptive control principles, self tuning regulator model referencing control.
Unit V – CONTROL OF SYNCHRONOUS MOTOR DRIVES
Synchronous motor and its characteristics, control strategies, constant torque angle control, unity power factor control, constant mutual flux linkage control.
Unit VI – CONTROLLERS
Flux weakening operation, maximum speed, direct flux weakening algorithm, constant torque mode controller, flux weakening controller, indirect flux weakening, maximum permissible torque speed control scheme,implementation strategy, speed controller design.
Unit VII – VARIABLE RELUCTANCE MOTOR DRIVE
Variable reluctance motor drives, torque production in the variable reluctance motor, drive characteristics and control principles, current control variable reluctance servo drive.
Unit VIII – BRUSHLESS DC MOTOR DRIVES
Three phase full wave brushless DC motor, sinusoidal type of brushless DC motor,current controlled brushless DC servo drives.