ELECTRIC MOTORS
Course Code BEE401
CIE Marks 50
Teaching Hours/Week (L:T:P: S) 3:0:0:0
SEE Marks 50
Total Hours of Pedagogy 40
Total Marks 100
Credits 03
Exam Hours 03
Examination nature (SEE) Theory
Module-1
DC Motors: Construction and working principle. Back E.M.F and its significance, Torque
equation, Classification, Characteristics of shunt, series & compound motors, Speed control of
shunt motor, Application of motors.
Losses and Efficiency- Losses in DC motors, power flow diagram, efficiency, condition for
maximum efficiency.
Testing of DC Motors: Direct & indirect methods of testing of DC motors- Swinburne’s test,
Field’s test, merits and demerits of tests. (numerical as applicable)
Module-2
Three Phase Induction Motors: Concept and generation of rotating magnetic field, Principle of
operation, construction, classification and types; squirrel-cage, slip-ring. Slip and its significance,
Torque equation, torque-slip characteristic covering motoring, generating and braking regions
of operation, Maximum torque, (numerical as applicable)
Module-3
Performance of Three-Phase Induction Motor: Phasor diagram of induction motor on no-load
and on load, equivalent circuit, losses, efficiency, No-load and blocked rotor tests. Performance
of the motor from the equivalent circuit. Cogging and crawling. High torque rotors-double cage
and deep rotor bars. Induction motor working as induction generator, construction and working
of doubly fed induction generator. (numerical as applicable)
Module-4
Starting and Speed Control of Three-Phase Induction Motors: Necessity of starter. Direct on
line, Star-Delta, and autotransformer starting. Rotor resistance starting. Speed control by
frequency.
Single-Phase Induction Motor: Double revolving field theory and principle of operation.
Construction and operation of split-phase, capacitor start and capacitor run and shaded pole
motors. Comparison of single phase motors and applications. (numerical as applicable)
Module-5
Synchronous Motor: Principle of operation, phasor diagrams, torque and torque angle, effect of
change in load, effect of change in excitation. V and inverted V curves. Synchronous condenser,
Other Motors: Construction and operation of Universal motor, AC servomotor, Linear induction
motor, PMSM, SRM and BLDC.
Suggested Learning Resources:
Text Books
1. Electric Machines, D. P. Kothari, I. J. Nagrath, McGraw Hill, 4th edition, 2011.
2. Theory of Alternating Current Machines, Alexander Langsdorf, McGraw Hill, 2nd
Edition, 2001.
3. Electric Machines, AshfaqHussain, DhanpatRai& Co, 2nd Edition, 2013.
Reference Books
1. Electrical Machines, Drives and Power systems, Theodore Wildi, Pearson, 6th Edition,
2014
2. Electrical Machines, M.V. Deshpande, PHI Learning, 2013
3. Electric Machinery and Transformers, Bhag S. Guru at el, Oxford University Press, 3rd
Edition, 2012
4. Electric Machinery and Transformers, Irving Kosow, Pearson, 2nd Edition, 2012
5. Principles of Electric Machines and power Electronic, P.C.Sen, Wiley, 2nd Edition, 2013
6. Electrical Machines, R.K. Srivastava, Cengage Learning, 2nd Edition, 2013
Web links and Video Lectures (e-Resources):
https://nptel.ac.in
http:// acl.digimat.in/nptel/courses/video/108105017/108105017.html
0 Comments