2021 regulation - 2nd year, 3rd semester paper for EEE Department (Electrical and Electronics Engineering Department). Subject Code: EE3303, Subject Name: Electrical Machines, Batch: 2021, 2022, 2023, 2024. Institute: Anna University Affiliated Engineering College, TamilNadu. This page has Electrical Machines study material, notes, semester question paper pdf download, important questions, lecture notes.
EE3303
ELECTRICAL MACHINES - I
COURSE OBJECTIVES:
•
To understand the concept of electromechanical energy conversion system.
•
To identify the appropriate machine for a given application based on its
characteristics.
•
To identify the appropriate test to determine the performance parameters of a
given machine.
•
To familiarize with the procedure for parallel operation of generators and
transformers.
•
To deliberate the working of auto transformer and three phase transformers.
UNIT I
ELECTROMECHANICAL ENERGY CONVERSION
Fundamentals
of Magnetic circuits- Statically and dynamically induced EMF - Principle of
electromechanical energy conversion forces and torque in magnetic field
systems- energy balance in magnetic circuits- magnetic force- co-energy in
singly excited and multi excited magnetic field system mmf of distributed
windings - Winding Inductances-, magnetic fields in rotating machines- magnetic
saturation and leakage fluxes. Introduction to Indian Standard Specifications
(ISS) - Role and significance in testing.
UNIT II
DC GENERATORS
Principle
of operation, constructional details, armature windings and its types, EMF
equation, wave shape of induced emf, armature reaction, demagnetizing and cross
magnetizing Ampere turns, compensating winding, commutation, methods of
improving commutation, interpoles, OCC and load characteristics of different
types of DC Generators. Parallel operation of DC Generators, equalizing
connections- applications of DC Generators.
UNIT III
DC MOTORS
Principle
of operation, significance of back emf, torque equations and power developed by
armature, speed control of DC motors, starting methods of DC motors, load
characteristics of DC motors, losses and efficiency in DC machine, condition
for maximum efficiency. Testing of DC Machines: Brake test, Swinburne's test,
Hopkinson's test, Field test, Retardation test, Separation of core
losses-applications of DC motors.
UNIT IV
SINGLE PHASE TRANSFORMER
Construction
and principle of operation, equivalent circuit, phasor diagrams, testing -
polarity test, open circuit and short circuit tests, voltage regulation, losses
and efficiency, all day efficiency, back-to- back test, separation of core
losses, parallel operation of single-phase transformers, applications of
single-phase transformer.
UNIT V
AUTOTRANSFORMER AND THREE PHASE TRANSFORMER
Construction
and working of auto transformer, comparison with two winding transformers,
applications of autotransformer. Three Phase Transformer- Construction, types
of connections and their comparative features, Scott connection, applications
of Scott connection.
TOTAL:
30+15=45 PERIODS
TEXT BOOKS
1.
I. J. Nagrath and D. P. Kothari, "Electric Machines", McGraw Hill
Education, 5th Edition, 2017. 2. P. S. Bimbhra, "Electric Machinery",
Khanna Publishers, 2nd Edition, 2021.
REFERENCES
1.
A. E. Fitzgerald and C. Kingsley, "Electric Machinery", New York,
McGraw Hill Education, 6th Edition 2017.
2.
A. E. Clayton and N. N. Hancock, "Performance and design of DC
machines", CBS Publishers, 2018.
3.
M. G. Say, "Performance and design of AC machines", CBS Publishers,
First Edition 2008.
4.
Sahdev S. K. "Electrical Machines", Cambridge University Press, 2018.
COURSE OUTCOMES:
At
the end of the course students will be able to:
CO1:
Apply the laws governing the electromechanical energy conversion for singly and
multiple excited systems.
CO2:
Explain the construction and working principle of DC machines.
CO3:
Interpret various characteristics of DC machines.
CO4:
Compute various performance parameters of the machine, by conducting suitable
tests.
CO5:
Draw the equivalent circuit of transformer and predetermine the efficiency and
regulation.
CO6:
Describe the working principle of auto transformer, three phase transformer
with different types of connections.
Electrical Machines: Unit I: a. Magnetic Circuits and Electromagnetism,, Electrical Machines: Unit I: b. Electromechanical Energy Conversion,, Electrical Machines: Unit II: D.C. Generators,, Electrical Machines: Unit III: a. D.C. Motors,, Electrical Machines: Unit III: b.Testing of D.C. Machines,, Electrical Machines: Unit IV: Single Phase Transformer,, Electrical Machines: Unit V: Autotransformer and Three Phase Transformer,, Electrical Machines: Solved model Question Paper 3rd Semester EEE Dept 2021 Regulation : EE3303 EM 1 3rd Semester EEE Dept | 2021 Regulation Electrical Machines I