Electrical Machines I - Department of Electrical Engineering

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Instructor: Mojtaba Mirsalim Office: 732 Aburayhan Building E-mail: [email protected]

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[email protected]

Electrical Machines_I (3 semester credits)

Courses Objectives:

The chief objective of Energy Conversion courses continues to be to build a strong foundation in the basic principles of Electro-mechanics and Electric Machinery. The emphasis of the courses has been on both physical and analytical techniques. In many institutes around the world, two semester courses in energy conversion and a laboratory are necessary to conform to the constraints of an electrical engineering undergraduate core curriculum. The courses should be of sufficient depth to provide basis for understanding many real-world electric-machinery applications and to satisfy the needs of those students who pursue specialization in other than power area. Concurrently, mastery of the material covered in the courses and the laboratory should prepare individuals in the electric power area with adequate prerequisite foundation for proceeding on to elective undergraduate and more advanced graduate courses in power systems, and electric machinery design and control.

Pre-Requisites:

Circuit Analysis II Electromagnetics

Textbook: Mirsalim, M.,

Electrical Machines and Transformers

, Prof. Hesabi Press, 2000.

References: 1) Fitzgerald, A. E., Kingsley, C., and Umans, S. D.,

Electric Machinery

, Sixth Edition, New York: McGraw-Hill, 2003. 2) Slemon, G.R. and A. Straughen,

Electric Machines

, Addison Wesley, 1980. 3) Chapman, S. E.,

Electric Machinery Fundamentals, Fourth Edition

, New York: McGraw- Hill, 2005 4) Cathey J. J.,

Electric Machines: Analysis and Design Applying Matlab

. New York: McGraw-Hill, 2001 5) Wildi, T.,

Electrical Machines, Drives, and Power Systems

, New Jersey: Prentice Hall, 2006 Ž

Ž

: If time permits

SYLLABUS

Introduction to Energy Resources, Machines, and Laboratory Precautions

1.

Introduction 2.

Energy Resources 3.

Conventional Methods in the Conversion of Electrical Energy 4.

Different Types of Machines

’ Main parts of a machine ’ Induction of Torque in machines

5.

Laboratory Safety

’ Mechanism of electric shock ’ ’ Reduction of electric shock hazards Ground fault circuit breaker

6.

Rescue Operations

’ Safety precautions in the laboratory

Review of Electromagnetism

1.

Magnetic Field 2.

Magnetic Flux 3.

Theory of Magnetization 4.

Magnetic Circuits

’ Flux leakage and fringing ’ Magnetization curves and hysteresis loops ’ Problem solving of magnetic circuits

5.

Induced Voltages 6.

Inductance

’ Self inductance ’ Mutual inductance

7.

Eddy Currents and Core Losses 8.

Excitation with Permanent Magnets 9.

Circuit Model of a Coil Wound around an Iron Core 10.

Electromagnetic Forces 11.

Electrmagnetic Torques

Fundamentals of Energy Conversion

1.

Introduction 2.

3.

4.

5.

Energy Balance Energy and Force in Singly-Excited Electromechanical Systems Energy and Torque in Multi-Excited Electromechanical Systems Reluctance Motors 6.

Dynamic Equations of Electromechanical Systems

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Construction and Principles of Direct-Current Machines

1.

Introduction 2.

3.

4.

5.

Common Principles in Rotating Machines Commutation and Rectified Voltages in DC Machines Armature Windings

’ Lap and wave windings and their applications

Electromagnetic Torque 6.

Armature Reaction

’ Flash over and compensating windings ’ Commutation and interpoles

Direct Current Generators

1.

Introduction

2.

3.

4.

Methods of Excitations

’ Voltage excitation ’ Current excitation

Basic Relations

’ Equivalent Circuits ’ Saturation Curves

Generator Characteristics

’ Separately Excited Generators ’ Self-Excited Shunt Generators ’ Shunt Generators ’ ’ Series Generators Compound Generators Ž

Ž Ž

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5.

6.

7.

8.

Comparison of External Characteristics of Generators Graphical Prediction of Generator External Characteristics Parallel Operation of Generators

’ Shunt Generators Paralleling

Power flow diagram

Direct Current Motors

1.

Introduction

Ž

Ž Ž

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2.

3.

4.

5.

Power Torque relations Back Electro-motive force Voltage -speed relationship Steady-State Characteristics

’ Shunt motor ’ ’ ’ ’ Series motor Compound motor Universal Motor Permanent magnet DC Motors

Comparison of DC motor Characteristics Power Flow Diagram 6.

7.

8.

9.

Rated Values Speed Control

’ Armature resistor control ’ ’ Flux control Armature Voltage Control

10.

Four-Quadrant Operation (Torque-Speed Characteristics) 11.

Start up of DC Motors 12.

DC Motor Braking 13.

Jogging Grading Policy: Homework = 25% Pop Quizzes = 5 to 10% Midterm = 25% (closed book) Final = 40 to 45% (one-page aid-sheet)

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