# EE1251 Electrical Machines 2 Syllabus

EE 1251 ELECTRICAL MACHINES - II 3 1 0 100

AIM
To expose the students to the concepts of synchronous and asynchronous machines and
analyse their performance.

OBJECTIVES
To impart knowledge on
i. Construction and performance of salient and non – salient type synchronous generators.

ii. Principle of operation and performance of synchronous motor.
iii. Construction, principle of operation and performance of induction machines.
iv. Starting and speed control of three-phase induction motors.
v. Construction, principle of operation and performance of
single phase induction motors and special machines.

1. SYNCHRONOUS GENERATOR 9
Constructional details – Types of rotors – emf equation – Synchronous reactance – Armature reaction – Voltage regulation – e.m.f, m.m.f, z.p.f 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.

2. 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.

3. 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.

4. STARTING AND SPEED CONTROL OF THREE PHASE INDUCTION MOTOR
7
Need for starting – Types of starters – Stator resistance and reactance, rotor resistance, autotransformer and star-delta starters – Speed control – Change of voltage, torque, number of poles and slip – Cascaded connection – Slip power recovery scheme.

5. 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 - Special machines - Shaded pole induction motor, reluctance motor, repulsion motor, hysteresis motor, stepper motor and AC series motor.

L = 45 T = 15 Total = 60

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.

REFERENCE BOOKS
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.

4. Sheila.C.Haran, ‘Synchronous, Induction and Special Machines’, Scitech Publications, 2001.
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