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# Electrical Machines I - EE6401

## MAGNETIC CIRCUITS AND MAGNETIC MATERIALS

-:- Magnetic Circuits and Magnetic Materials
-:- Laws Governing Magnetic Circuits
-:- Flux Linkage, Inductance and Energy
-:- Statically and Dynamically Induced Emf
-:- Properties of Magnetic Materials
-:- Iron or Core losses
-:- AC Operation of Magnetic Circuits
-:- Transformer as a Magnetically Coupled Circuit
-:- Solved problems - Magnetic Circuits and Magnetic Materials
-:- Important Short Questions and Answers : Electrical machines - Magnetic Circuits and Magnetic Materials

## TRANSFORMERS

-:- Transformer: Principle of Operation
-:- An ideal Transformer: Principle of Operation
-:- Induction Law - Transformer
-:- Equivalent Circuit of Transformer
-:- Transformer Losses
-:- Transformer Tests
-:- Efficiency of a Transformer
-:- Voltage Regulation of Transformer
-:- Auto Transformer
-:- Three-phase autotransformer connection
-:- Parallel Operation of Transformers
-:- Tap Changing in Transformer
-:- Solved Problems - Transformer - Electrical machines
-:- Important Short Questions and Answers: Electrical machines - Transformer

## ELECTROMECHANICAL ENERGY CONVERSION AND CONCEPTS IN ROTATING MACHINES

-:- Energy In Magnetic Systems
-:- The Field Energy
-:- The Co Energy
-:- Force In A Singly Excited Magnetic Field System
-:- Force in a Multiply Excited Magnetic Field System
-:- Mmf of Distributed Windings
-:- Magnetic Fields In Rotating Machines
-:- Rotating Mmf Waves
-:- Torque in Ac And Dc Machines
-:- Solved Problems - Electromechanical Energy Conversion and Concepts in Rotating Machines
-:- Important Short Questions and Answers - Electromechanical Energy Conversion and Concepts in Rotating Machines

## DC GENERATORS

-:- Construction of DC Machines
-:- Lap Winding
-:- Wave Winding
-:- EMF Equation of DC Generators
-:- Armature reaction
-:- Methods of excitation of the field windings
-:- Methods of Excitation used for DC Generator
-:- Commutation and Interpoles
-:- DC Generator Characteristics
-:- Important short questions and answers: DC Generators

## DC MOTORS

-:- Principle of operation of a D.C. Motor
-:- Working of D.C. Motor
-:- Types of DC Motors
-:- DC Motor Characteristics
-:- Speed Control of DC Shunt Motor: Varying Armature Resistance, Field Resistance
-:- Starting of DC Motors
-:- Three Point Starter: Working principle
-:- Four Point Starter
-:- Swinburne’s Test
-:- Hopkinson’s test: Procedure, Calculation of efficiency, Advantages, Disadvantages
-:- Braking of DC shunt motor
-:- Important Short questions and answers: DC Motor - Electrical machines