Electrical drives.Advantages of electrical drives. Parts of electrical drives, choice of electrical drives, status of dc and ac drives, Dynamics of electrical drives, Fundamental torque equation, speed torque conventions and multiquadrant operation. Equivalent values of drive parameters, components of low torques, nature and classification of load torques, calculation of time and energy loss in transient operations, steady state stability, load equalization.
Thermal model of motor for heating and cooling,Classes of motor duty, determination of motor rating.
(a) Starting braking, transient analysis, single phase fully controlled rectifier, control of separately excited dc motor, Single-phase half controlled rectifier control of separately excited dc motor. (b) Three phase fully controlled rectifier - control of separately excited dc motor, three phase half controlled rectifier - control of separately excited dc motor, multi-quadrant operation of separately excited dc motor fed from fully controlled rectifier. Control of dc series motor, chopper controlled dc drives-separately excited dc motor and series motor.
Operation with unbalanced source voltage and single phasing, operation with unbalanced rotor impedances,analysis of induction motor fed from non-sinusoidal voltage supply, starting braking, transient analysis.
Variable voltage and variable frequency control, voltage source inverter control, closed loop control, current source inverter control, , rotor resistance control, slip power recovery, speed control of single phase induction motors.
Operation from fixed frequency supply, synchronous motor variable speed drives, variable frequency control of multiple synchronous motors. Self-controlled synchronous motor drive employing load commutated thyrister inverter.
Rolling mill drives, cement mill drives, paper mill drives and textile mill drives.