D.C. Generator Library

➣ Introduction

➣ Revision of Magnetism

       Laws of Magnetism

       Magnetic Field and Flux

➣ Revision of Electromagnetism

       Right Hand Thumb Rule

       Magnetic Field Due to Circuit Conductor

➣ Principle of Operation of a D.C. Generator

➣ Fleming's Right Hand Rule

➣ Single Turn Alternator

➣ Construction of a Practical D.C. Machine

       Yoke 

       Poles

       Field Winding (F1-F2)

       Armature

       Commutator

       Brushes and Brush Gear

       Bearings

➣ Types of Armature Winding

       Lap Winding

       Wave Winding

       Comparison of Lap and Wave Type Winding

➣ E.M.F. Equation of D.C. Generator

➣ Winding Terminologies

➣ Single Layer and Double Layer Winding

       Single Layer Winding

       Double Layer Winding

➣ Closed and Open Windings

       Closed Type Winding

       Open Type Winding

➣ Armature Winding in D.C. Machines

       Coil Span

       Pole Pitch

➣ Winding Pitches

       Back Pitch

       Front Pitch

       Winding Pitch

       Commutator Pitch

➣Introduction to Armature Reaction

➣ Concept of Armature Reaction

➣ Demagnetization and Cross Magnetising Conductors

       Calculation of Demagnetizing and Cross Magnetizing Amp-Turns

➣ Effects of Armature Reaction

➣ Reduction of Effects of Armature Reaction

       Use of Compensating Winding

➣ Action of Commutator

➣ Practical Commutation

       Expression of Reactance Voltage

➣ Methods of Improving Commutation

       Resistance Commutation

              Advantages of Resistance Commutation

              Disadvantages of Resistance Commutation

       E.M.F. Commutation

       Giving Brush Shift

       Interpoles

➣ Methods of Excitation

➣ Separately Excited Generator

       Voltage and Current Relations

➣ Self Excited Generator

➣ Symbolic Representation of D.C. Generator

➣ Types of D.C. Generator

➣ Shunt Generator

       Voltage and Current Relations

➣ Series Generators

       Voltage and Current Relations

➣ Compound Generator

       Long Shunt Compound Generator

       Short Shunt Compound Generator

       Comulative and Differential Compound Generator

➣ Characteristics of D.C. Generators

       Magnetism Characteristics

       Load Characteristics

➣ Characteristics of Separately Excited D.C. Generators

       Magnetization 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

➣ Voltage Building in Self Excited Generator

       Causes of Failure to Excite Self Excited Generator

➣ Critical Field Resistance in D.C. Shunt Generator

       Practical Determination of Rc

       Critical Speed Nc

➣ Applications of Various Types of Generators

➣ Parallel Operation of Generators

➣ Parallel Operation of D.C. Generators

➣ D.C. Shunt Generators in Parallel

➣ D.C. Compound Generators in Parallel

➣ D.C. Series Generators in Parallel