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Electrical Machines – 1 JNTU | EM-1 Notes JNTU

Electrical Machines – 1 Notes JNTU – EM-1 Notes JNTU of Total Complete Notes

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UNIT I Principles of Electromechanical Energy Conversion

Introduction, Induced emf in Electromechanical Systems, Model of Electromechanical Systems

UNIT – 2 DC GENERATOR

Working principle, Nature of induced elf, Construction of DC machines, Types of armature winding, Armature Reaction and Commutation

UNIT – 3 TYPES OF DC GENERATORS

Permanent Magnet DC Generator,Separately Excited DC Generator, Shunt Wound DC Generators, D.C. GENERATOR CHARACTERISTICS, Open Circuit Characteristic of a D.C. Generator,  Characteristics of a Separately Excited D.C. Generator, Voltage Build-Up in a Self-Excited Generator

UNIT – 4 DC MOTOR

 Working principle, Direction of rotation of motor, Significance of Back emf

UNIT – 5 TESTING OF DC MACHINES

 Introduction, Major losses, Swinburne’s Test, Hopkinson’s test, Loading the machines, Calculation of efficiency, Condition for maximum efficiency

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