WITH EFFECT FROM THE ACADEMIC YEAR 2013- 2014

EE 402

ELECTRIC DRIVES AND STATIC CONTROL

Instruction                                                                                                                                                                                         4  Periods per week

Duration of University Examination                                                                                                                                                     3  Hours

University Examination                                                                                                                                                                       75 Marks

Sessional                                                                                                                                                                                            25 Marks

UNIT-I

Electric Drives: Concept and classification, four quadrant operation, Dynamics of Electric Drives, Types of Loads, Torque characteristics of Load, characteristics of Motor-Load combination, Dynamics of Motor-Load combination, Steady-state and Transient stability of Electric Drive. Characteristics of Electric Drives: Modified Speed-Torque Characteristics of D.C Shunt motors, D.C Series motor and Induction motors.

UNIT-II

Starting of Electric Motors: Methods of Starting Electric Motors, Acceleration time, Energy relation during starting, D.C Shunt and series motor and Induction motors, Methods to reduce the energy loss during starting.

Electric Braking: Types of Braking- Regenerative braking, dynamic braking and Plugging, Braking of D.C Shunt motor, DC Series motor and 3-phase Induction motor, Energy relation and Dynamics of Braking. Effect of load inertia and load equalization.

UNIT-III

D.C Motor Control: Single-phase controlled rectifier and chopper circuit arrangement for continuous armature current operation. Dual converter control, Circulating current and non-circulating current modes of operation, Principles of closed loop control for D.C drives.

UNIT-IV

Induction Motor Control: Speed control of 3-phase induction motor with A.C voltage regulators, Voltage source inverters and Cyclo-converters, Static rotor resistance control, slip power recovery schemes: Static Krammer drive and Scherbius drive.

 UNIT-V