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Electrical Machines

Electrical Machines. Instructor: Prof. G. Bhuvaneshwari, Department of Electrical Engineering, IIT Delhi. The course introduces electrical machines - namely transformers, DC and AC rotating machines, which are, arguably, the most important components of the energy and power conversion industry. Transformers, being static, are the easiest of electrical machines and hence they will be dealt with initially after introducing magnetic circuit fundamentals. DC and AC machines will be discussed after understanding the process of electromechanical energy conversion through a magnetic field. The efficiency, voltage regulation and characteristics of these machines will be discussed while they are functioning as generators. Further, their speed-torque characteristics, starting, braking, speed control and efficiency will be discussed while they function as motors. Every topic will include their applications in various power industries as well. (from nptel.ac.in)

Lecture 28 - DC Machine: Comutation

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Lecture 01 - Introduction to Electrical Machines

Lecture 02 - Single-phase and Three-phase AC Circuits, Magnetic Circuits

Lecture 03 - Magnetic Circuits (cont.)

Lecture 04 - Magnetic Circuits (cont.)

Lecture 05 - Transformers: Introduction

Lecture 06 - Transformers: Amp-Turn Balance, Ideal and Practical Transformers

Lecture 07 - Transformer Equivalent Circuit and Reducing Leakage

Lecture 08 - Transformer Equivalent Circuit Parameter Determination

Lecture 09 - Transformers: Voltage Regulation and Efficiency

Lecture 10 - Auto-transformers

Lecture 11 - PU Notation and Introduction to Instrument Transformers

Lecture 12 - Instrument Transformers and All Day Efficiency

Lecture 13 - Three Phase Transformers I

Lecture 14 - Three Phase Transformers II

Lecture 15 - Electromechanical Energy Conversion I

Lecture 16 - Electromechanical Energy Conversion II

Lecture 17 - Electromechanical Energy Conversion III

Lecture 18 - DC Machines: Introduction, Constructional Features

Lecture 19 - DC Machines: EMF and Torque Equations and Generator Operation

Lecture 20 - DC Machines: OCC and Load Characteristics Classification

Lecture 21 - DC Machines: Armature Reaction

Lecture 22 - DC Machines: Voltage Build-Up and Load Characteristics

Lecture 23 - DC Generator Characteristics and Introduction to DC Motors

Lecture 24 - DC Motors: Basics and Speed-Torque Relationship

Lecture 25 - DC Motor: Speed Control (Shunt and Separately Excited Motor)

Lecture 26 - DC Motor: Speed Control (Series and Compound Motor)

Lecture 27 - DC Machine: Starting and Braking

Lecture 28 - DC Machine: Comutation

Lecture 29 - 3 Phase Induction Machine: Constructional Features and Principle of Operation

Lecture 30 - 3 Phase Induction Machine: Equivalent Circuit

Lecture 31 - 3 Phase Induction Machine: Speed Torque Characteristics

Lecture 32 - Testing of Induction Motor: OC and SC Test

Lecture 33 - 3 Phase Induction Machine: Starting Methods

Lecture 34 - Synchronous Machines: Introduction

Lecture 35 - Synchronous Machines: Constructional Features

Lecture 36 - Numerical Session

Lecture 37 - Synchronization of Alternators

Lecture 38 - Synchronous Machines: Equivalent Circuit and Phase Diagram

Lecture 39 - Synchronous Machines: OC and SC Test

Lecture 40 - Synchronous Machines: Power Angle Relationship, V and Inverted V Curves

Lecture 41 - Single Phase Induction Motors