Three Phase Induction Motor Library

Three Phase Induction Motor Library

➣ Intorduction

➣ Rotating Magnetic Field (R.M.F.)

     Production of R.M.F.

     Speed of R.M.F.

     Direction of R.M.F.

➣ Concept of Slip Rings and Brush Assembly

➣ Construction

     Stator

     Rotor

          Squirrel Cage Rotor

          Slip Ring or Wound Rotor

          Comparison of Squirrel Cage and Wound Rotor

➣ Working Principle

     Can N = N_s ?

➣ Slip of Induction Motor

➣ Effect of Slip on Rotor Parameters (Part1 - Part2  - Part3)

     Effect on Rotor Frequency

     Effect on Magnitude of Rotor Induced E.M.F.

     Effect on Rotor Resistance and Reactance

     Effect on Rotor Power Factor

     Effect on Rotor Current

➣ Induction Motor as a Transformer

➣ Torque Equation

     Starting Torque

➣ Condition for Maximum Torque

     Magnitude of Maximum Torque

➣ Torque Slip Characteristics

     Full Load Torque

     Generating and Braking Region

➣ Torque Ratios

     Full Load and Maximum Torque Ratio

     Starting Torque and Maximum Torque Ratio

➣ Speed - Torque Characteristics

➣ Effect of Change in Rotor Resistance on Torque

➣ Losses in Induction Motor

➣ Power Flow in an Induction Motor

➣ Relation Between P₂, P_c and P_m

     Derivation of k in Torque Equation

➣ Efficiency of an Induction Motor

➣ Equivalent Circuit of Induction Motor (Part1 -  Part2)

➣ Phasor Diagram of Induction Motor

➣ Effect of Harmonics on Performance of 3 Phase Induction Motor

     Crawling

     Cogging

➣ Special Rotor Constructions

     Deep Bar Rotor Construction

     Double Cage Rotor Construction

     Comparison of Single Cage and Double Cage Motors

➣ Application

➣ Induction Generator (Part1    -   Part2)

     Circle Diagram of Induction Generator

      Comparison of Induction Generator and Synchronous Generator

     Advantages

     Disadvantages

     Applications

➣ Induction Regulator

     Induction Regulator : Introduction

     Single Phase Induction Regulator

     Three Phase Induction Regulator

➣ Induction Synchronous Motor

➣ Circle Diagram : Introduction

➣ Circle Diagram of a 3 Series R - L Circuit

➣ Circle Diagram of a 3 Phase Induction Motor

➣ Obtaining Data to Plot Circle Diagram

➣ No Load Test

     Separating No Load Losses

➣ Blocked Rotor Test

➣ Construction of the Circle Diagram

     Predicting Performance From Circle Diagram

     Maximum Quantities

     Full Load Condition

➣ Load Test on Three Phase Induction Motor

➣ Necessity of Starter

     Types of Starter

➣ Stator Resistance Starter

     Relation between T_st and T_F.L.

➣ Autotranformer Starter

     Relation between T_st and T_F.L.

➣ Star - Delta Starter

     Ratio of T_st and T_F.L.

➣ Rotor Resistance Starter

➣ Direct on Line Starter (D.O.L.)
➣ Soft Starters

➣ Speed Control of Three Phase Induction Motor

➣ Supply Frequency Control or V/f Control

➣ Voltage Supply Control

➣ Controlling Number of Poles

     Consequent Pole Method

     Multiple Stator Winding Method

     Pole Amplitude Modulation Method

➣ Adding Rheostats in Stator Circuit

➣ Addnig External Resistance in Rotor Circuit

➣ Cascade Control

➣ Injecting Slip-Frequency E.M.F. into Rotor Circuit

     Kramer System

     Scherbius

➣ Electrical Braking of an Induction Motor (Part1  -  Part2)

     Dynamic or Rheostat Braking

     Plugging

     D.C. Dynamic Braking

     Regenerative Braking

➣ Protection for Induction Motor

     Abnormal Conditions and failure in Case of Induction Motor

     Protection Circuit for Induction Motor

     Single Phasing Preventer

     Earth Leakage Circuit Breaker

     Miniature Circuit Breaker (MCB)