Hello Mr. Mohit Gupta,

Dynamic braking appears to be your best bet on stopping a DC motor. Searching www.google.com yielded the following results. There was an inordinate amount of information about dynamic resistors and availability.

Enjoy.

Dynamic Braking search REPORT using www.google.com
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http://www.google.com/search?nu...22&spell=1
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Searched English pages for "dynamic braking".
Results 1 - 100 of about 6,710
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http://www.msha.gov/S&HINFO/T...PAPER3.HTM
APPLICATION OF DYNAMIC BRAKING
TO MINE HOISTING SYSTEMS
Thomas D. Barkand and William J. Helfrich
U.S. Department of Labor
Mine Safety and Health Administration
Cochrans Mill Road, P.O. Box 18233
Pittsburgh, Pennsylvania 15236
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http://www.wheelchairjunkie.com/braking.html
Published 12/00, Copyright 2000 , WheelchairJunkie.com
POWERCHAIR Braking!!!
By Mark E. Smith
=======Includes Schmatic====================
http://www.homemetalshopclub.org/news/sep0...sep01.html
Reversing and Dynamic Braking of Single-Phase Induction

Motors
By Dick Kostelnicek
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Regards,

Charles Bannister