JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Electrical Machines

Course Objectives

to prepare the students to

• Identify the methods and assumptions in modeling of machines.
• Recognize the different frames for modeling of AC machines.
• Write voltage and torque equations in state space form for different machines. Cousre Outcomes: At the end of the course, the student is able to:
• Develop the mathematical models of various AC and DC machines
• Analyze the developed models in various reference frames.

UNIT - I

Basic Two-pole DC machine - primitive 2-axis machine – Voltage and Current relationship – Torque equation. Mathematical model of separately excited DC motor and DC Series motor in state variable form – Transfer function of the motor - Numerical problems. Mathematical model of D.C. shunt motor D.C. Compound motor in state variable form – Transfer function of the motor - Numerical Problems

UNIT - II

Linear transformation – Phase transformation (a, b, c to α, β, o) – Active transformation (α .β, o to d, q). Circuit model of a 3 phase Induction motor – Linear transformation - Phase Transformation – Transformation to a Reference frame – Two axis models for induction motor - dq model based DOL starting of Induction Motors

UNIT - III

Voltage and current Equations in stator reference frame – equation in Rotor reference frame – equations in a synchronously rotating frame – Torque equation - Equations in state – space form.

UNIT - IV

Circuits model of a 3ph Synchronous motor – Two axis representation of Synchronous Motor. Voltage and current Equations in state – space variable form – Torque equation - dq model based short circuit fault analysis- emphasis on voltage, frequency and recovery time.

UNIT - V

Modeling of Permanent Magnet Synchronous motor – Modeling of Brushless DC Motor.

TEXT BOOKS:

• 1. Generalized Machine theory - P.S. Bimbhra, Khanna Publishers
• 2. Analysis of electric machinery and Drives systems - Paul C. Krause, Oleg wasynezuk, Scott D. Sudhoff.

REFERENCES:

• 1. Thyristor control of Electric Drives - Vedam Subranmanyam.
• 2. Power System Stability and Control – Prabha Kundur, EPRI.
• 3. Performance optimization of induction motors during Voltage-controlled soft starting, Article in IEEE Transactions On Energy Conversion, July 2004. R19 M.TECH M. TECH. PE/PEED
• 4. A Novel Method for Starting of Induction Motor with Improved Transient Torque Pulsations, Nithin K.S, Dr. Bos Mathew Jos, Muhammed Rafeek, Dr. Babu Paul. International Journal of Engineering and Innovative Technology (IJEIT) Volume 2, Issue 8, February 2013.
• 5. NPTEL Course on “Modelling and Analysis of Electrical Machines”, https://www.youtube.com/playlist?list=PLbMVogVj5nJQBG9363J1uq5Fnq4m1yGXL R19 M.TECH M. TECH. PE/PEED M. TECH – I YEAR – I SEM. (PE/PEED)