Tip:
Highlight text to annotate it
X
you can make this amazingly simple model with just an old choke, bulb, copper wire and permanent
magnets. first take the copper wire and roll it to make a coil with about 1200 turns separated
in 3 layers by a paper. now take an old choke and open it after removing epoxy and the copper
winding take out the iron core, the U shape iron core. an old choke is just a transformer.
once you remove these wires you can take out the iron core and tape it to make two U shape
iron cores. motors work on the basic principle of magnetic induction. it says that whenever
you pass a current through a conductor it produces magnetic field and when we pass alternating
current through the conductor it will produce alternating magnetic field or spinning magnetic
field and when it interacts with permanent magnet it will try to repel the magnet. and
since the magnet is free to move it will rotate and this is the basic principle of AC motor.
now you can fix this U shaped iron core on the wooden board using the screws. put another
support where you can put the rotating magnets. you need to connect a 60V bulb to the coil
in series. this is because the copper wire in our coil has very little resistance and
if we do not connect it to a load it will short our power supply and the coil will burn.
after inserting the coil in one of the iron core insert the other iron core on top. take
these two magnets and attach it to the cycle spoke. this is our rotor. now if you put this
rotor in the space between the two iron cores, you can see it does not rotate. the moment
we switch on the current, magnetic field passes very strongly in the space between the iron
cores. it interacts with the permanent magnet and attracts because it is a rotating magnetic
field and this is what spins our motor. see how it rotates beautifully. we need the core
to make the EMF concentrated between the space in the two iron cores. see how children are
having fun. you have to be careful making this model and make sure that you have connected
the bulb in series.