D.C. MOTOR – MALAYALAM – 30MB.wmv

D.C. MOTOR – MALAYALAM – 30MB.wmv


this is perhaps the simplest motor on earth.
you will require some magnets, a battery, insulated copper wire, some rubber bands.
take 1.5m of insulated copper wire and wind it round and round over the battery. make
10 or 12 turns and then remove it like a spring. take one end and tie a knot and stretch it
out. do the same thing on the other end. both these ends will be in line with the center
of the coil. they will be along the diameter so that there is equal distribution of weight.
with the scissors trim both these ends so that they are just 3cm long. the coil is almost
ready but not quiet. now take a knife and scrape out the insulation on three sides on
one end. one side will still remain insulated. on the other side scrape the insulation on
all four sides and there will be all copper on this side. this is like a brush for the
commutator. now take 1cm broad rubber bands from old bicycle tube. stretch it on the battery,
one across and one along its cylinder. place a ferrite magnet in one of the rubber bands.
take two safety pins and fix them on the two ends so that they touch the plus and minus
of the battery. the motor is ready now. this is the picture which depicts the brushes more
clearly. take the coil and place it in the two holes of the safety pin and give the coil
a little flip. and it would start spinning. it is amazing to see this motor spin. if you
bring another magnet on top, you could see some times the coil spins must faster. if
they are opposite poles it spins much faster. if you reverse the magnets there will be similar
poles, both north or both south, and in this case the coil just slows down. take the coil
and fan it out to make an egg shape. put it again inside the motor and this oval shaped
coil also spins very fast. you can try various shapes and sizes of coils. you can do another
experiments with this motor. on one single battery this motor works for 3 hours. its
perhaps the simplest motor on earth.

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