Course Details

Subject {L-T-P / C} : EE3201 : Electric Drives {3-0-0 / 3}
Subject Nature : Theory
Coordinator : Prof. Kanungo Barada Mohanty


Fundamentals of Drives: Factors affecting selection of drives, speed-torque characteristics of motors and loads, condition of steady-state stability, transient stability: equal area criterion, dynamics of motor load combination, Ratings based on thermal consideration, DC shunt motor and series motor braking methods and speed-torque characteristics in four quadrants, Induction motor: steady-state performance analysis, braking methods, four quadrant speed-torque characteristics, DC and AC dynamic braking, Methods of starting, energy relations during starting and braking, Transients in DC and AC drives.
DC Drives: DC Motor and converter performance parameters, 1-phase full- and semi- converter fed dc shunt and DC series motor, Mathematical analysis of 1-phase converter fed dc motors, 1-phase Dual converter: waveforms, operations with and without circulating current, 3-phase full converter, semi converter and dual converter fed DC drives, Power factor considerations of semi- and full converters, Power factor improvement of phase controlled converters, Sequence control of converters, Chopper controlled DC drives.
Induction Motor Drive: Static speed control of induction motor: stator voltage control, Static control of rotor resistance, Static slip power recovery scheme, VSI and cyclo-converter fed drives, V/f control, constant torque and constant power operations, closed loop V/f control, CSI fed drives, Induction motor behavior with non-sinusoidal supply and unbalanced supply, PWM inverters and reduction of harmonics,
Synchronous motor drives: 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 mill and paper mills Electric traction services, nature of traction load, main line and sub-urban train configuration, traction mechanics, traction drives, braking, power factor and harmonics, traction motor.

Course Objectives

  1. To acquire the knowledge of Electric Drives
  2. To acquire the knowledge of drives in industry and traction

Course Outcomes

CO1: Ability to select appropriate drive with correct rating of motor
CO2: Skill in developing flux weakening operation of electric drives.
CO3: To design one, two and four quadrant drives.
CO4: Ability to design closed loop control schemes with modern control theory applications.

Essential Reading

  1. G. K. Dubey, Fundamentals of Electrical Drives, Narosa Publishing House, New Delhi , 2001
  2. N. K. De and P. K. Sen, Electric Drives, PHI Learning Pvt. Ltd., New Delhi , 1999

Supplementary Reading

  1. S. K. Pillai, A First Course in Electrical Drives, New Age International, New Delhi , 1994
  2. V. Subrahmanyam, Electric Drives: Concepts and Applications, New Age International, New Delhi , 2005