ELECTRICAL MACHINES & CONTROL (NEE 409)

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Syllabus of ELECTRICAL MACHINES & CONTROL (NEE 409)

UNIT I
Single phase Transformer: Efficiency Voltage regulation, O.C.& S.C. Tests.
Three Phase Transformer: Three phase transformer connections, Auto Transformer: Volt- Amp relations,
Efficiency, Advantages & Disadvantages, Applications.
D.C. Motors: Concept of starting, Speed control, Losses and Efficiency (simple numericals only)
UNIT II
Three phase Induction Motor: Construction, Equivalent circuit, Torque equation and torque- slip
characteristics, Speed control (simple numericals only).
Alternator: Construction, e.m.f. equation, Voltage regulation and its determination by synchronous
impedance method. (simple numericals only)
Synchronous Motor (conceptual treatment only): Starting, Effect of excitation on line current (V-curves),
Synchronous condenser.
Servo Motor: Two phase AC and DC servo motors & their applications.
UNIT III
Modeling of Mechanical System: Linear mechanical elements, Force-voltage and force- current analogy,
Electrical analog of simple mechanical systems; Concept of transfer function & its determination for
simple systems.
Control System: Open loop & closed loop controls systems; advantages and disadvantages.
Signals: Unit step, Unit ramp, Unit impulse and Periodic signals with their mathematical representation
and characteristics.
UNIT IV
Time Response Analysis: Time response of a standard second order system and response specifications.
Stability: Concept and types of stability, Routh Hurwitz Criterion and its application for determination of
stability, Limitations (simple numerical only); Only conceptual treatment of Polar plot, Nyquist stability
criterion and assessment of stability.
UNIT V
Root Locus Techniques: Concept of root locus, construction of root loci. Bode plot, Gain margin and
Phase margin and their determination.
Process control: Introduction to P, PI and PID controllers their characteristics, representation and
applications.

Books and References:
1. I. J. Nagrath & D. P. Kothari, “Electrical machines”, Tata McGraw Hill.
2. P.S.Bimbhra, “Electrical Machinery”, Khanna Publishers
3. K. Ogata, “Modern Control Engineering”, Prentice Hall of India.
4. Ghosh, “Control Systems: Theory and Applications”, Pearson
5. B.C. Kuo, “Automatic Control systems”, Wiley India Ltd.
6. D. Roy Choudhary, “Modern Control Engineering” Prentice Hall of India.
7. M. Gopal, “Control Systems: Principles and Design” Tata McGraw Hill.

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