Summary

a set of devices to convert electric energy into mechanical energy and to regulate the converted energy flux according to a specific law.

 It is the most common type of drive.

Definitions

 Topic

 AN INTRODUCTION TO ELECTRICAL DRIVES & ITS DYNAMICS:

 Electrical drives. Advantages of electrical drives. Parts of electrical drives, choice of electrical drives, the status of dc and ac drives, Dynamics of electrical drives, Fundamental torque equation, speed-torque conventions, and multi quadrant 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.

 SELECTION OF MOTOR POWER RATING:

Thermal model of the motor for heating and cooling, Classes of motor duty, determination of motor rating.

DC MOTOR DRIVES:

(a) Starting braking, transient analysis, single-phase fully controlled rectifier, control of dc separately excited motor, Single-phase half controlled rectifier control of dc separately excited motor.

(b) Three-phase fully controlled rectifier control of dc separately excited motor, three phases half controlled rectifier control of dc separately excited motor, multi quadrant operation of dc separately excited motor fed form fully controlled rectifier. Rectifier control of dc series motor, chopper controlled dc drives, chopper control of separately excited dc motor. Chopper control of series motor.

 INDUCTION MOTOR DRIVES:

(a) Operation with unbalanced source voltage and single phasing, operation with unbalanced rotor impedances, analysis of induction motor fed from the non-sinusoidal voltage supply, starting braking, transient analysis.

(b) Stator voltage control variable voltage frequency control from voltage sources, voltage source inverter control, closed-loop control, current source inverter control, current regulated voltage source inverter control, rotor resistance control, slip power recovery, speed control of single-phase induction motors.                      

 SYNCHRONOUS MOTOR DRIVES:

Operation form faced frequency supply, synchronous motor variable speed drives, and variable frequency control of multiple synchronous motors. Self-controlled synchronous motor drive employing load commutated thruster inverter.

 INDUSTRIAL DRIVES:

Rolling mill drives, cement mill drives, paper mill dries and textile mill drives.                                                                                                                   

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