NPTEL : NOC:Electrical Machines-II (Electrical Engineering)

Co-ordinators : Prof.Tapas Kumar Bhattacharya


Lecture 1 - Inductance, Self and Mutual

Lecture 2 - Relationship of Inductances in Transformer

Lecture 3 - Equivalent Circuit from Circuit KVL Equations

Lecture 4 - Co-efficient of Coupling , Energy Stored in Coupled Coils

Lecture 5 - A Single Conductor Generator and Motor

Lecture 6 - Analysis of Single Conductor Generator and Motor

Lecture 7 - Analysis of Single Conductor Generator and Motor (Continued...)

Lecture 8 - Flux Density Distribution in Space and Nature emf

Lecture 9 - Flux Density Distribution in Space and Nature emf (Continued...)

Lecture 10 - From Linear to Rotating Machine

Lecture 11 - From Linear to Rotating Machine (Continued...)

Lecture 12 - Basic Underlying Principle of Operation of Rotating Machine

Lecture 13 - Basic Underlying Principle of Operation of Rotating Machine (Continued...)

Lecture 14 - Flux Density Distribution along the Air Gap

Lecture 15 - Flux Density Distribution along the Air Gap (Continued...)

Lecture 16 - Induced Voltage in a Coil in a Rotating Machine

Lecture 17 - Induced Voltage in a Coil in a Rotating Machine (Continued...)

Lecture 18 - Induced Voltage in a Coil in a Rotating Machine (Continued...)

Lecture 19 - Induced Voltage due to Fundamental and Harmonic Components of Flux Density Distribution

Lecture 20 - Distributed Coils Connected in Series Resultant Voltage

Lecture 21 - Distribution Factor

Lecture 22 - Pitch Factor and Winding Factor

Lecture 23 - How to decide about Short Pitch Angle ϵ

Lecture 24 - Double Layer 3-phase Winding - An Introduction

Lecture 25 - Winding Table for 3-phase Distributed Winding

Lecture 26 - Winding Table for 3-phase Distributed Winding with Examples

Lecture 27 - Winding Table for 3-phase Distributed Winding with Examples (Continued...)

Lecture 28 - 120 degree Phase Spread Winding with Examples

Lecture 29 - Winding Table of 120 degree Phase Spread Coils and Group Connection

Lecture 30 - Introduction to Rotating Magnetic Field

Lecture 31 - Rotating Magnetic Field (Continued...), Mechanical and Electrical Speed

Lecture 32 - Speed and Direction of Rotating Field

Lecture 33 - Synchronous Speed and How to Calculate Induced Voltage in a Coil

Lecture 34 - Introduction to Induction Motor

Lecture 35 - Introduction to Induction Motor (Continued...)

Lecture 36 - General Expression of Torque in Terms of Stator and Rotor Fields

Lecture 37 - Torque Angle and Torque Expression

Lecture 38 - How to Fix Up Positions of Net Field, Rotor Field and Stator Field

Lecture 39 - Slip: Its Importance and Range for Motor Operation

Lecture 40 - Equivalent Circuit of 3-Phase Induction Motor

Lecture 41 - Equivalent Circuit of 3-Phase Induction Motor (Continued...)

Lecture 42 - Equivalent Circuit of 3-Phase Induction Motor (Continued...)

Lecture 43 - Expression for Electromagnetic Torque in terms of Equivalent Circuit Parameters

Lecture 44 - Maximum Electromagnetic Torque and Slip at Which it Occurs

Lecture 45 - Typical Torque Slip Characteristic and Operating Point

Lecture 46 - Change in Torque-slip Characteristic as Supply Voltage and Rotor Resistance are Varied

Lecture 47 - Types of Induction Motor - Slip Ring Type

Lecture 48 - Introduction to Cage Induction Motor

Lecture 49 - Cage Motor Can Operate for Different Stator Poles

Lecture 50 - Core Loss in Induction Motor and Simplified Equivalent Circuit

Lecture 51 - Torque Expression from Simplified Equivalent Circuit and Introduction to Circle Diagram

Lecture 52 - Circle Diagram (Continued...)

Lecture 53 - Exact Power Flow Diagram and Circle Diagram

Lecture 54 - Circle Diagram (Continued...)

Lecture 55 - Circle Diagram: Slip Line

Lecture 56 - Circle Diagram from Test Data

Lecture 57 - Starting of 3 Phase Induction Motor - Introduction

Lecture 58 - DOL and Reactor Starting

Lecture 59 - DOL and Auto Transformer Starting

Lecture 60 - Introduction to Speed Control

Lecture 61 - Idea of VVVF Speed Control of Induction Motor

Lecture 62 - Speed Contro Using Two Motors

Lecture 63 - Electrical Braking of 3 Phase Induction Motor

Lecture 64 - Braking (Continued...)

Lecture 65 - Introduction to Single Phase Induction Motor - Sequence Currents

Lecture 66 - Development of Equivalent Circuit

Lecture 67 - Development of Equivalent Circuit (Continued...)

Lecture 68 - Torque-slip Ch. of 1 ph. I-M Running on Single Winding

Lecture 69 - Introduction to Starting of 1ph. Induction Motor

Lecture 70 - Expression for Starting Torque and Need for Phase Splitting

Lecture 71 - Resistor Split 1 ph. Induction Motor

Lecture 72 - Capacitor Split 1 ph Induction Motor

Lecture 73 - Starting of 1 ph. Induction Motor (Continued...)

Lecture 74 - Synchronous Machine Construction

Lecture 75 - Synchronous Generator - Introduction

Lecture 76 - Synchronisation

Lecture 77 - Expression for Induced Voltage and O.C. Phasor Diagram

Lecture 78 - Loaded Synchronous Generator - Resultant Field

Lecture 79 - Armature Reaction and Synchronous Reactance. Basic Phasor Diagram

Lecture 80 - General Mode of Operation - Rotro Field, Stator Field and Resultant Field

Lecture 81 - Complete Phasor Diagram and Expression for Complex Power

Lecture 82 - Synchronous Motor Operation, Phasor Diagram and Power Expression

Lecture 83 - Effect of Variation of Field Current in Generator

Lecture 84 - Effect of Variation Field Current in Synchronous Motor, Introduction to Salient Pole Machine

Lecture 85 - Analysis of Salient Pole Synchronous Machine

Lecture 86 - Phasor Diagram of Salient Pole Synchronous Machine for Generator and Motor Mode

Lecture 87 - Expression for Load Angle and Expression for Power

Lecture 88 - Phasor Diagrams of Salient Pole Synchronous Generator under Various Conditions

Lecture 89 - Phasor Diagrams of Salient Pole Synchronous Motor under Various Conditions

Lecture 90 - O.C and S.C Test on Synchronous Generator