Instructor: Dr. Jose Titus (jtitus@ee.iith.ac.in)
Offered during: Aug - Dec 2024
Days: Mondays, Wednesdays, and Thursdays (E slot)
Room: A-112
Office hours: Mondays, 2:00 PM – 3:00 PM and by appointment only
Teaching Assistant: Mr. Karthickraja
The first part of the course deals with developing dynamic models for electromechanical systems, especially three-phase induction motors. The scope of using the developed models to implement high performance control schemes for the machines will be discussed in the later part.
Electrical Machines (EE2200) or equivalent
Basic understanding of differential equations and matrix theory
Review of magnetostatics and introduction to simple electromechanical systems
Magnetostatics fundamentals – Coupled linear magnetic circuits – Modeling simple linear motion electromechanical systems – Cylindrical motion electromechanical systems – Multiply excited electromechanical systems – Nonlinear magnetic systems – Energy and Co-energy methods – Elementary ac motor – Simulation methods – General considerations on modeling and simulating electric machines in Simulink
Modeling Three-phase induction machines
Distributed windings – Inductance of a distributed winding – Three phase distributed windings – Mutual inductances of three phase distributed windings – Three phase induction machine – Stator to rotor mutual inductances – Air gap mmf – Voltage and flux linkage equations in phase variables – MMF equivalence and change of variables – Amplitude invariant and Power Invariant Transformations – Machine model in stationary frame – Transforming to rotor reference frame – Machine model in arbitrary rotating reference frame – Equations in field oriented reference frames – Space vector notations – Model using space vectors – Generalised model for system of coils
Introduction to control
Seperately excited DC motor dynamic model – Speed control techniques: Armature and Field control – 4-quadrant dc-dc converter – PWM modulation technique – Armature controlled DC motor drive – Torque regulation – Speed Regulation – Design of current control loops – Design of speed control loop - Integrator antiwindup – Flux weakening operation – Rotor field oriented control for induction motors – Model based speed estimation for sensorless control
Lecture notes can be found in here Lectures.
P. C. Krause. Analysis of Electric Machinery and Drive Systems. Wiley, 2013.
R. Krishnan, Electric Motor Drives: Modeling, Analysis, and Control. Prentice Hall, 2001.
Assignments: 40%
Midterm exam: 20%
Final exam: 40%