WITH EFFECT FROM THE ACADEMIC YEAR 2012 - 2013
EE 352
ELECTRICAL MACHINERY - III
Instruction 4/1 Periods per week
Duration of University Examination 3 Hours
University Examination 75 Marks
Sessional 25 Marks
UNIT-I
Synchronous Machines: Constructional Details, Types of windings – Winding factors -e.m.f. equation -Fractional pitch and fractional slot windings -Suppression of harmonics and tooth ripple -Armature reaction and reactance -Synchronous impedance.
UNIT-II
Synchronous Generator: Voltage Regulation -Phasor diagram of alternator with non-salient poles -O.C. and S.C characteristics – Synchronous impedance, Ampere turn, ZPF methods for finding regulation –Principle of two reaction theory and its application for the salient pole synchronous machine analysis -Synchronism and parallel operation.
UNIT-III
Synchronous Motor: Theory of operation- Vector diagram –Variation of current and p.f. with excitation -Hunting and its prevention –Current and power diagram Predetermination of performance –Methods of Starting and Synchronizing. Synchronizing Power. Synchronous Condenser.
UNIT-IV
Transient Stability Studies of Synchronous Machines: Elementary ideas of transient behavior of an Alternator -Three phase short circuit of an Alternator -Elementary ideas of the stability of synchronous machine connected to infinite Bus. Special Machines -Permanent Magnet Motors, Switched Reluctance Motors, Hysteresis Motors.
UNIT-V
Two phase servo motor characteristics- Single phase motors- Theory and operation of single phase motors-Shaded pole, Split phase and capacitor motors -Compensated and uncompensated series and repulsion motors. Linear Induction motors.
Suggested Reading:
- 1.I.J.Nagrath & D.P. Kothari, Electrical Machines, Tata McGraw Hill, 2004, 3rd ede.
- 2.S.K.Bhattacharya, Electrical Machines, Tata McGraw Hill, 2002.
- 3.P.S.Bhimbhra, Generalized Theory of Electrical Machines, Fifth Edition, Khanna Publishers, l995,
- 4.M.G Say, The Performance and Degin of A.C Machine, Pitman Publications, 1985.