Course Details

Subject {L-T-P / C} : EE3201 : Electric Drives { 3-0-0 / 3}

Subject Nature : Theory

Coordinator : Prof. Venkata Ramana Naik N.

Syllabus

Module 1: Electrical Drives- An introduction Electrical drives, advantages, parts electrical drives: electrical motors, power modulators, sources and control unit. Factors affecting the selection of electrical drives.
1 hour
Module 2: Dynamics of Electrical Drives: Fundamental torque equations, speed-torque conversions and multiquadrant operation, equivalent values of drive parameters, components of load torques, nature and classifications of load torques, calculation of time and energy loss in transient operation, steady state stability, load equalization.
4 hours
Module 3: Control of Electrical Drives: Modes of operation: Steady state, Acceleration including starting, Decceleration including stopping. speed control and drive classification, closed loop control of drives
2 hours
Module 4: Selection of Motor Power rating: Thermal model for heating and cooling, classes of motor duty and determination of motor rating.
2 hours
Module 5: DC Motor Drives: DC motors and their performances. Starting, braking: regenerative, dynamic and plugging. Speed control: Armature, field and ward Leonard control, transformer and un-controlled rectifier control.
5 hours
Module 6: Rectifier Controlled DC drives: DC Motor and converter performance parameters, 1-phase full- and semi-converter fed separately excited, and series motor in continuous and dis-continuous operating modes. Mathematical analysis of 1-phase converter fed dc motors, 3-phase full converter, semi-converter and dual converter fed DC drives. 1-phase and 3-phase Dual converter: waveforms, operations with and without circulating current fed separately excited and series motor. Control of fractional HP motors, Power factor considerations of semi-and full converters, Power factor improvement of phase controlled converters.
7 hours
Module 7: Chopper controlled DC drives: Braking methods, types of chopper control for various quadrant operation, four-quadrant converter, source current harmonics in chopper fed separately excited dc motor and series motor in continuous and discontinuous operating modes.
5 hours
Module 8: Induction motor Drives: Induction motor steady-state performance analysis, methods of starting, braking methods: DC and AC dynamic braking, Plugging, Regenerative braking, four quadrant operation, energy relations during starting and braking. behavior with non-sinusoidal supply and unbalanced supply, PWM inverters and reduction of harmonics.
5 hours
Module 9: Speed control of Induction motor: Stator voltage control, variable frequency control: Variable frequency control, Slip speed control, closed loop V/f control, braking and multi quadrant operation, closed loop control of cyclo-converter fed induction motor drive, Rotor resistance control: conventional and static rotor resistance control, Slip power recovery: static scherbious and kramar drive
5 hours
Module 10: Synchronous motor drives: Transient Stability of Synchronous motor, True and self-synchronous modes, Brushless dc motor drive, V/f control. Reluctance motor, SRM, stepper motors, Industrial application of motors in steel mills, textile mills, cement mills, and paper mills Electric traction services, nature of traction load, mainline and sub-urban train configuration, traction mechanics, traction drives, braking, power factor and harmonics, traction motor.
5 hours

Course Objectives

Course Outcomes

CO1: Ability to select an appropriate drive with a correct rating of the motor <br />CO2: Skill in developing armature control and flux weakening operation of electric drives. <br />CO3: Design one, two, three, and four quadrant drives. <br />CO4: Ability to design closed-loop control schemes with modern control theory applications.

Essential Reading

Supplementary Reading