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Electrical Machines - I [III Semester EEE]

Author: U.A.Bakshi "III Semester EEE"

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Publisher	Technical Publications
Product Format	Paper Back
Language Published	English
Volume Number	--
Number of Pages	--
Product ID	9789333219181

Electrical Machines - I :

UNIT I Magnetic Circuits and Magnetic Materials

Magnetic circuits - Laws governing magnetic circuits - Flux linkage, Inductance and energy - Statically and dynamically induced EMF - Torque - Properties of magnetic materials, Hysterisis and eddy current losses - AC excitation, Introduction to permanent magnets-Transformer as a magnetically coupled circuit. (Chapter - 1)

UNIT II Transformers

Construction - Principle of operation - Equivalent circuit parameters - Phasor diagrams, Losses - Testing - Efficiency and voltage regulation - All day efficiency-Sumpner’s test, Per unit representation - Inrush current - Three phase transformers - Connections - Scott connection - Phasing of transformer- Parallel operation of three phase transformers-Auto transformer - Tap changing transformers- Tertiary winding. (Chapters - 2,3 and 4)

UNIT III Electromechanical Energy Conversion and Concepts in Rotating Machines

Energy in magnetic system - Field energy and coenergy-force and torque equations - Singly and multiply excited magnetic field systems-MMF of distributed windings - Winding inductances - Magnetic fields in rotating machines - Rotating mmf waves - Magnetic saturation and leakage fluxes. (Chapters - 5, 6)

UNIT IV DC Generators

Construction and components of DC Machine - Principle of operation - Lap and wave windings-EMF equations - Circuit model - Armature reaction - Methods of excitation - Commutation - interpoles Compensating winding - Characteristics of DC generators. (Chapter - 7)

UNIT V DC Motors

Principle and operations - Types of DC motors - Speed torque characteristics of DC motors - Starting and speed control of DC motors - Plugging, Dynamic and regenerative braking - Testing and efficiency - Retardation test- Swinburne’s test and Hopkinson’s test - Permanent Magnet DC (PMDC) Motors - Applications of DC motor. (Chapters - 8, 9)