EE2302 ELECTRICAL MACHINES - II SYLLABUS

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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

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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.

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REFERENCES

1. A.E. Fitzgerald, Charles Kingsley, Stephen.D.Umans, ‘Electric Machinery’, Tata

McGraw Hill publishing Company Ltd, 2003.

2. J.B. Gupta, ‘Theory and Performance of Electrical Machines’, S.K.Kataria and Sons,

2002.

3. K. Murugesh Kumar, ‘Electric Machines’, Vikas Publishing House Pvt Ltd, 2002.