JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Power Electronic Converters , Electrical Machines

Course Objectives

to prepare the students to

• understand principle of operation of scalar control of ac motor and corresponding speed-torque characteristics
• comprehend the vector control for ac motor drive (IM and SM)
• explain the static resistance control and Slip power recovery drive
• explain synchronous motor drive characteristics and its control strategies
• comprehend the brushless dc motor principle of operation.

Course Outcomes

student will be able to:

• Develop induction motor for variable speed operations using scalar and vector control techniques.
• Identify the difference between the rotor resistance control and static rotor resistance control method and significance of slip power recovery drives.
• Develop controllers for synchronous motor and variable reluctance motor.

UNIT - I

RECTIFIER CONTROLLED DC MOTOR: Separately excited DC motors and DC series motors with single phase semi converter and single phase full converter-Three-phase controlled converter, control circuit, control modeling of three phase converter – Steady state analysis of three phase converter control DC motor drive – Two quadrant, Three phase converter controlled DC motor drive – DC motor and load, converter. CLOSED LOOP CONTROL OF DC DRIVE: Current and speed controllers - Current and speed feedback – Design of controllers – Current and speed controllers – Motor equations – filter in the speed feedback loop speed controller – current reference generator – current controller and flow chart for simulation – Harmonics and associated problems – sixth harmonics torque.

UNIT - II

CHOPPER CONTROLLED DC MOTOR DRIVES: Principle of operation of the chopper – Chopper with other power devices – model of the chopper – input to the chopper – steady state analysis of chopper controlled DC motor drives – Closed loop operation: Speed controlled drive system – current control loop – pulse width modulated current controller – hysteresis current controller – modeling of current controller – design of current controller.

UNIT - III

CONTROL OF INDUCTION MOTOR: Introduction to motor drives – Torque production – Equivalent circuit analysis – Speed – Torque Characteristics with variable voltage operation Variable frequency operation constant v/t operation – Variable stator current operation – Induction motor characteristics in constant torque and field weakening regions. STATOR SIDE CONTROL: Scalar control – Voltage fed inverter control – Open loop volts/Hz control – speed control slip regulation – speed control with torque and flux control – current controlled voltage fed inverter drive –

R19 M.TECH M. TECH. PE/PEED

ROTOR SIDE CONTROL OF INDUCTION MOTOR DRIVES: Slip power recovery drives – Static Kramer Drive – Phasor diagram – Torque expression – speed control of Kramer Drive – Static Scheribus Drive – modes of operation.

UNIT - IV

VECTOR CONTROL OF INDUCTION MOTOR DRIVES: Principles of Vector control – Vector control methods – Direct methods of vector control – Indirect methods of vector control – Adaptive control principles – Self tuning regulator Model referencing control – Direct torque control of AC motors.

UNIT - V

CONTROL OF SYNCHRONOUS MOTOR DRIVES: Synchronous motor and its characteristics – Control strategies – Constant torque angle control – Unity power factor control – Constant mutual flux linkage control – closed loop operation.

TEXT BOOKS:

• 1. Electric Motor Drives Pearson Modeling, Analysis and control – R. Krishnan – Publications – 1st edition – 2002.
• 2. Modern Power Electronics and AC Drives B K Bose – Pearson Publications 1st edition

REFERENCES:

• 1. Power Electronics and Control of AC Motors – MD Murthy and FG Turn Bull Pergman Press 1st edition
• 2. Power Electronics and AC Drives – BK Bose – Prentice Hall Eagle wood diffs New Jersey - 1st edition
• 3. Power Electronic circuits Deices and Applications – M H Rashid – PHI – 1995.
• 4. Fundamentals of Electrical Drives – G. K. Dubey – Narosa publications – 1995.
• 5. NPTEL online course on Electric Drives by Prof. Gopakumar, https://www.youtube.com/playlist?list=PL350C8304DD04538D
• 6. NPTEL course on Advanced Electric Drives by Dr. S.P. Das, https://www.youtube.com/playlist?list=PLA5CA7D35114BA425 R19 M.TECH M. TECH. PE/PEED M. TECH – I YEAR – II SEM. (PE/PEED)