EE 2302 ELECTRICAL MACHINES - II ANNA UNIVERSITY FIFTH SEMESTER EEE SYLLABUS

EE 2302 ELECTRICAL MACHINES - II

AIM
To expose the students to the concepts of synchronous and asynchronous machines
and analyze their performance.
OBJECTIVES
To impart knowledge on
 Construction and performance of salient and non – salient type synchronous
generators.
 Principle of operation and performance of synchronous motor.
 Construction, principle of operation and performance of induction machines.
 Starting and speed control of three-phase induction motors.
 Construction, principle of operation and performance of single phase induction
motors and special machines.
UNIT I SYNCHRONOUS GENERATOR 9
Constructional details – Types of rotors – emf equation – Synchronous reactance –
Armature reaction – Voltage regulation – EMF, MMF, ZPF and A.S.A methods –
Synchronizing and parallel operation – Synchronizing torque - Change of excitation and
mechanical input – Two reaction theory – Determination of direct and quadrature axis
synchronous reactance using slip test – Operating characteristics - Capability curves.
UNIT II SYNCHRONOUS MOTOR 8
Principle of operation – Torque equation – Operation on infinite bus bars - V-curves –
Power input and power developed equations – Starting methods – Current loci for
constant power input, constant excitation and constant power developed.
UNIT III THREE PHASE INDUCTION MOTOR 12
Constructional details – Types of rotors – Principle of operation – Slip – Equivalent
circuit – Slip-torque characteristics - Condition for maximum torque – Losses and
efficiency – Load test - No load and blocked rotor tests - Circle diagram – Separation of
no load losses – Double cage rotors – Induction generator – Synchronous induction
motor.
UNIT IV STARTING AND SPEED CONTROL OF THREE PHASE INDUCTION MOTOR
7
Need for starting – Types of starters – Rotor resistance, Autotransformer and Star-delta
starters – Speed control – Change of voltage, torque, number of poles and slip –
Cascaded connection – Slip power recovery scheme.
UNIT V SINGLE PHASE INDUCTION MOTORS AND SPECIAL MACHINES 9
Constructional details of single phase induction motor – Double revolving field theory
and operation – Equivalent circuit – No load and blocked rotor test – Performance
analysis – Starting methods of single-phase induction motors - Shaded pole induction
motor - Linear reluctance motor - Repulsion motor - Hysteresis motor - AC series motor.
L = 45 T = 15 TOTAL = 60 PERIODS
TEXT BOOKS
1. D.P. Kothari and I.J. Nagrath, ‘Electric Machines’, Tata McGraw Hill Publishing
Company Ltd, 2002.
2. P.S. Bhimbhra, ‘Electrical Machinery’, Khanna Publishers, 2003.