INDUSTRIAL DRIVES AND APPLICATION (18EE741)

INDUSTRIAL DRIVES AND APPLICATION

Course Code 18EE741
CIE Marks 40
Teaching Hours/Week (L:T:P) (3:0:0) 
SEE Marks 60
Credits 03 
Exam Hours 03

Course Learning Objectives:

• To define electric drive, its parts, advantages and explain choice of electric drive.
• To explain dynamics and modes of operation of electric drives.
• To explain selection of motor power ratings and control of DC motor using rectifiers.
• To analyze the performance of induction motor drives under different conditions.
• To explain the control of induction motor, synchronous motor and stepper motor drives.
• To discuss typical applications electrical drives in the industry.

Module-1

Electrical Drives: Electrical Drives, Advantages of Electrical Drives. Parts of Electrical Drives, Choice of Electrical Drives, Status of DC and ac Drives. Dynamics of Electrical Drives: Fundamental Torque Equations, Speed Torque Conventions and Multi-quadrant Operation. Equivalent Values of Drive Parameters, Components of Load Torques, Nature and Classification of Load Torques, Calculation of Time and Energy Loss in Transient Operations, Steady State Stability, Load Equalization. Control Electrical Drives: Modes of Operation, Speed Control and Drive Classifications, Closed-loop Control
of Drives.

Module-2

Direct Current Motor Drives: Controlled Rectifier Fed DC Drives, Single Phase Fully Controlled Rectifier Control of DC Separately Excited Motor, Single Phase Half Controlled Rectifier Control of DC Separately Excited Motor, Three Phase Fully Controlled Rectifier Control of DC Separately Excited Motor, Three Phase 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, Supply Harmonics, Power Factor and Ripple in Motor Current, Chopper Control of Separately Excited DC Motor, Chopper Control of Series Motor.

Module-3

Induction Motor Drives: Analysis and Performance of Three Phase Induction Motors, Operation with
Unbalanced Source Voltage and Single Phasing, Operation with Unbalanced Rotor Impedances, Analysis of Induction Motor Fed From Non-Sinusoidal Voltage Supply, Starting, Braking, Transient Analysis. Speed Control Techniques-Stator Voltage Control, Variable Voltage Frequency Control from Voltage Sources.

Module-4

Induction Motor Drives (continued):Voltage Source Inverter (VSI) Control, Cycloconverter Control,
Closed Loop Speed Control and Converter Rating for VSI and Cycloconverter Induction Motor Drives, Variable Frequency Control from a Current Source, Current Source (CSI) Control, current regulated voltage source inverter control, speed control of single-phase induction motors. Synchronous Motor Drives: Operation from fixed frequency supply-starting, synchronous motor variable speed drives, variable frequency control of multiple synchronous motors.

Module-5

Synchronous Motor Drives (continued): Self-controlled synchronous motor drive employing load
commutated thyristor inverter, Starting Large Synchronous Machines, Permanent Magnet ac (PMAC)
Motor Drives, Sinusoidal PMAC Motor Drives, Brushless DC Motor Drives. Stepper Motor Drives: Variable Reluctance, Permanent Magnet, Important Features of Stepper Motors, Torque Versus Stepping rate Characteristics, Drive Circuits for Stepper Motor. Industrial Drives: Textile Mills, Steel Rolling Mills, Cranes and Hoists, Machine Tools.

Course Outcomes: At the end of the course the student will be able to:

• Explain the advantages, choice and control of electric drive
• Explain the dynamics, generating and motoring modes of operation of electric drives
• Explain the selection of motor power rating to suit industry requirements
• Analyze the performance & control of DC motor drives using controlled rectifiers
• Analyze the performance & control of converter fed Induction motor, synchronous motor & stepper
motor drives.

Question paper pattern:

• The question paper will have ten full questions carrying equal marks.
• Each full question will be for 20 marks.
• There will be two full questions (with a maximum of four sub- questions) from each module.
• Each full question will have sub- question covering all the topics under a module.
• The students will have to answer five full questions, selecting one full question from each module.

Textbooks

1 Fundamentals of Electrical Drives Gopal K. Dubey Narosa Publishing 2nd Edition, 2001
2 Electrical Drives: Concepts and Applications (Refer to chapter 07 for Industrial Drives VedumSubrahmanyam McGraw Hill 2nd Edition, 2011

Reference Books

1 Electric Drives N.K De,P.K. Sen PHI Learning 1st Edition, 2009