AU3003 Traction Motors Syllabus:
AU3003 Traction Motors Syllabus – Anna University Regulation 2021
COURSE OBJECTIVES:
The objective of this course is to make the students to understand various systems of track electrification, power supply system and mechanics of electric train, and identify a suitable drive for electric traction.
UNIT I TRACTION SYSTEMS
Electric drives – Advantages & disadvantages – System of track electrification – d.c., 1-Phase low frequency, 3-Phase low frequency and composite systems, Problems of 1-phase traction system – Current unbalance, Voltage unbalance, Production of harmonics, Induction effects, Booster transformer – Rail connected booster transformer. Comparison between ac. and d.c. systems.
UNIT II TRACTION MECHANICS
Types of services, Speed – time curves – Construction of quadrilateral and trapezoidal speed time curves, Average & schedule speeds. Tractive effort – Speed characteristic, Power of traction motor, specific energy consumption – Factors affecting specific energy consumption, Coefficient of adhesion, slip – Factors affecting slip, magnetically suspended trains
UNIT III POWER SUPPLY ARRANGEMENTS
High voltage supply, Constituents of supply system – Substations, Feeding post, Feeding & sectioning arrangements, Remote control center, Design considerations of substations, Over head equipment – principle of design of OHE, Polygonal OHE – Different types of constructions, Basic sag & tension calculations, Dropper design, Current collection gear for OHE.
UNIT IV TRACTION MOTORS
Desirable characteristics, D.C. series motors, A.C. series motors, 3-Phase induction motors, linear induction motors, D.C. motor series & parallel control – Shunt bridge transition – Drum controller, Contact type bridge transition control, Energy saving, Types of braking in a.c. and d.c. drives, Conditions for regenerative braking, Stability of motors under regenerative braking.
UNIT V SEMI CONDUCTOR CONVERTER CONTROLLED DRIVES
Advantages of A.C. Traction – Control of D.C. motors – single and two stage converters, Control of ac. motors – CSl fed squirrel cage induction motor, PWM VSl induction motor drive, D.C. traction — Chopper controlled d.c. motors, composite braking, Diesel electric traction — D.C. generator fed d.c. series motor, Alternator fed d.c. series motor, Alternator fed squirrel cage induction motor, Locomotive and axle codes.
TOTAL: 45 PERIODS
COURSE OUTCOMES:
At the end of this course, students will be able to
1. Understand Traction systems and its mechanics
2. Identify the power supply equipment for traction systems
3. Analyze various types of motors used in traction
4. Differentiate AC and DC traction drives
REFERENCES:
1. Partab.H – Modern Electric Traction, Dhanpat Rai & Sons – 1998.
2. Dubey. G.K. – Fundamentals of Electrical Drives, Narosa Publishing House – 2001.
3. C. L. Wadhwa — Generation, Distribution and Utilization of Electrical Energy, New Age International – 2006.
4. J.B. Gupta – Utilization of Electrical Power and Electric Traction, S. K. Kataria & Sons publications, 9th edition 2004.