Course

Unit 1

Introduction: Concepts, and classification of Electric drives. Selection of motors. Dynamics of Electric drives: Types of loads, Multi quadrant operations, motor dynamics steady state stability and transient stability. Rating and Heating of motors: Heating effects, heating and cooling curves, classes of duty, load equalization, environmental factors.

Unit 2

DC motor drives: Basic characteristics, Operating modes, Single phase and three phase-controlled rectifier fed DC drives, Dual converters drives, Chopper drives, Rheostatic and regenerative braking, effects of changes in supply voltage and load torque, closed loop control schemes. Induction motor drives, stator voltage control, stator impedance control, rotor voltage control- Slip power recovery, Concepts of Static Kramer drives and Static Scherbius drive, V/f control, Current control method. Need for harmonic filter, closed loop control. Introduction to vector control scheme.

Unit 3

Synchronous motors: Speed torque characteristics and torque angle characteristics. Fixed and variable frequency operation modes, Self-control modes. Special machines: Brushless DC motor, Switched Reluctance Motor, Stepper Motor, introduction to the relevant converter circuits. Hardware- DC Speed control- Converter fed DC motor – Induction motor drive- Speed Control-Closed loop and open loop. Virtual lab/ Simulation – Phase controlled DC motor drives, Chopper controlled DC motor drives-modelling of DC motor-modelling of induction motor- Closed loop control of DC and AC Drives. Introduction to axial flux motors.

Course Objectives

1. To inculcate conceptual framework and classification of electric drives, emphasizing motor selection and dynamics
2. To demonstrate the basic characteristics and types of DC motors, operational modes, and various control schemes
3. To elaborate on the intricacies of induction motor drives, including stator voltage control, rotor voltage control, slip power recovery and closed loop control
4. To enable practical skills on testing motor characteristics.

Course Outcomes

CO-PO Mapping

Skills acquired

Expertise in motor selection, dynamic analysis, and stability considerations for electric drives, and advanced control proficiency in DC and AC motor drives, with practical skills in implementing closed-loop control strategies

Text Books / References

1. Pillay. S.K, A First Course on Electric Drives, Wilely Eastern Limited, Bombay, 2022
2. Ramu Krishnan, Permanent Magnet Synchronous and Brushless DC Motor Drives, CRC Press, 2019
3. B.K Bose, ‘Power Electronics and AC Drives’, Prentice Hall, New Jersy, 2020.
4. Gopal K.Dubey, Fundamentals of Electrical Drives, Narosa Publishing House, 2001
5. Emadi, Ali, Advanced Electric Drive Vehicles, CRC Press 2014
6. R.Krishnan, ’Electric Motor Drives, Modeling, Analysis and Control’, Prentice Hall, NJ, 2001.
7. K T Chau, Electric Vehicle Machines and Drives – Design, Analysis and Application, IEEE Wiley Press 2015,