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Specifications of Electrical Machine 1

Book Details

  • 978-93-80311-81-4
  • English
  • 2011, 2012, 2013, 2014
  • Paper Back
  • 400

Contents

  • 1. Magnetic Circuits & Electro mechanical Energy Conversion
    Objectives, Introduction, Magnetic Circuits, Magnetomotive Force, Magnetic Field Strength (H), Permeability, Reluctance, Analogy between Electric and Magnetic Circuits, B-H Curve, Hysteresis, Series and Parallel Magnetic Circuits, Series Magnetic Circuits, Series Parallel Magnetic Circuits, Practical Magnetic Circuits, Permanent Magnet and Their Applications, Basic Principles of Electromechanical Energy Conversion, Basic Aspects of Energy Conversion, Energy Balance, Statically Induced E.M.F. and Dynamically Induced E.M.F., Dynamically Induced E.M.F., Statically Induced E.M.F., Physical Phenomena Involved in Energy Conversion, Singly Excited Magnetic Field System, Multiple Excited Magnetic Field System, Solved Problems, Unsolved Problems, Review Questions.
     
    2. DC Generator
    Objectives, Introduction, Constructional Aspects of D.C. Machines, Types of D.C. Machines, Homopolar Machines, Hetero-polar D.C. Machines, Types of Generators, E.M.F. Equations, Winding Arrangement, Single Layer and Double Layer Winding, Closed Type Winding, Coil Span or Coil-Pitch (YS), Pole Pitch, Winding Pitches, Lap Winding, Wave winding, Equalizing Connections, Armature Reaction, Correcting Armature Reaction, Commutation, Methods of Improving Commutations, Demagnetizing and Cross Magnetizing M.M.F., Characteristics of D.C. Generators, Magnetisation Characteristics, Load Characteristics, Characteristics of Separately Excited D.C. Generators, Magnetisation or Open Circuit Characteristics, Load Saturation Curve, Internal and External Characteristics, Load Characteristics of D.C. Shunt Generator, Internal Characteristics, External Characteristics, Load Characteristics of D.C. Series Generator, Load Characteristics of D.C. Compound Generator, Parallel Operation, Parallel Operation of Shunt Generator, Parallel Operation of Compound Generators, Parallel Operation of Series Generators, Rosenberg Generator, Parts of Rosenberg Generator, Working of Rosenberg Generator, Solved Problems, Unsolved Problems, Review Questions, Answer Key.
     
    3. DC Motors
    Objectives, Introduction, D.C. Motor Principle, Fleming’s Left Hand Rule, Back E.M.F. or Counter E.M.F., Types of D.C. Motors, Shunt Motor, Series Motor, Compound Motor, Production of Torque, Basic Concept of Armature Reaction in D.C. Motors, Interpoles or Compoles, Basic Functions of Interpoles, Characteristics of D.C. Motor, Characteristics of D.C. Shunt Motor, Characteristics of D.C. Series Motor, Characteristics of D.C. Compound Motor, D.C. Motor Starting, Types of Manual Starters for D.C Motors, Types of Starters for Automatic Acceleration, Speed Control of D.C. Motor, By Armature Voltage Variation, By Varying Field Current, Ward Leonard Method, Braking of D.C. Motor, Dynamic or Rheostatic Braking, Regenerative Braking, Reverse Voltage Braking or Plugging, Losses and Efficiency of D.C. Motor, Losses in D.C. Motors, Efficiency of a D.C. Motor, Testing of D.C. Motor, Direct Method of Testing, Indirect Method of Testing, Swinburne's Test (No load Test), Hopkinson's Test (Back-to-back Test or Regenerative Test), Retardation (or Running Down) Test, Field's Test, Single Phase Series Motor, Solved Problems, Unsolved Questions, Multiple Choice Questions, Answer Key, Review Questions, Answer Key.
     
    4. Transformers
    Objectives, Introduction, Basic Principle, Construction, Core Construction, Windings, Insulation Aspects, Cooling of Transformers, Tank and Accessories, Ideal Transformer, EMF Equation of a Transformer, Alternative Method to find EMF Equation of a Transformer, Voltage Transformation Ratio (k) or Turns Ratio, Transformer on No-Load Condition, Transformer On-Load Condition, Equivalent Circuit of 1–? Transformer, Approximate Equivalent Circuit, Vector Diagram, Testing of Transformers, Open-Circuit or No-load Test, Short-Circuit Test, Sumpner’s Back to Back Test, Efficiency, All Day Efficiency, Condition for Maximum Efficiency, Voltage Regulation, Effect of Frequency, Parallel Operation of Transformer, Auto Transformer, Advantages of an Auto Transformer, Disadvantages of an Auto Transformer, Applications of Auto Transformers, Switching Currents in Transformer, Separation of Core Losses, Instrument Transformers, Current Transformers, Potential Transformers, Basic Idea of Welding Transformer, Solved Problems, Unsolved Problems, Review Questions, Answer Key.
     
    5. Polyphase Transformers
    Objectives, Introduction, Single Unit or Bank of Single-Phase Units, Polyphase Connections, Choice of Transformer Connections, Voltage Current Relationships for Different Types of Connections, Open-Delta or V Connection, Application of Open Delta or V–V Connection, Limitations, 3 to 6 Phase Conversion, 3 to 2 Phase Conversion, Effect of 3-Phase Winding Connections on Harmonics, In Case of Single Phase Transformers, In Case of Three Phase Banks of Single Phase Transformers, The Harmonic Behavior of Polyphase Banks, In Case of 3-Phase Transformers Units, 3-Phase Winding Transformers, Advantages and Disadvantages of Three Winding Transformer, Tertiary Winding, Why to use Tertiary Winding?, Stabilization Due to Tertiary Winding, Suppression of Triple Frequency Currents by Tertiary Winding, Solved Problems, Unsolved Problems, Multiple Choice Questions, Answer key, Review Questions.
     
    P. Paper