How to make an electrical motor?
Answer:
If you had open a motor and have a look inside, you will see there's two thin magnet along the shell of the motor. At the centre, there's a huge cylinder of iron which act as electromagnet as electric passed through it (because the iron piece is coiled with copper wire). Stick with the iron cylinder, is a pair of commutator, it cuts off the electrical supply as it rotate, without electrical supply, the iron cylinder is just an iron. With electrical supply, it turn into electromagnet which will repel from the magnet at the wall of the motor shell thus create a circular movement.
Still don't understand? I suggest you have a look at the http://electronics.howstuffworks.com/mot...
There's animation and videos clips which helps you to understand better.
Here's a link to what is claimed to be the simplest electric motor. I just don't see how the circuit breaks to establish rotation.
the bast way is to use two speaker magnets, a hexagonal pencil, some insulated wire, some plastercine, two old cd cases, some tiny screws (preferebly of a soft magnetic material) a rubber band and two straight pins.
you put a line of screws along one of the six sides of the pencil skip one put another set skip one and put the final set (these will be the electromagnetically induced metal cores that make up the armature) and they must be at 60 degree angles from each other..
Cut the wire in three equal pieces. you hold about 2 inces of wire spare and then begin wrapping the wire (wrap usin the same direction for all three screws) around a line of screws along one of the planes until you have approximatly two inches spare again. now you remove the insulatuion from both ends, holding the pencil longways away from you with point facing your eye, the screw that you now wrapped make sure it is facing the top and the other two at the bottom, they shoul look like the three ends of a triangle. now you stick the loose ends of the wire along the side angles of the pencil on the second angle on the left and right from the plane with the screw. you can use a piece of the rubber band to hold it in place. repeat these steps on the other two screws. keep in mind the more coils around the screws the more powerful the motor. this is the armature.
you sharpen the other end of the pencil and make two small grooves in each of the cd cases, face them opposite each other and put the pencil points in them so it should be able to rotate. place each of the magnets within close proximity to the coils makin sure different poles are inside. u put the staright pins perpendicular to the pencil but able to touch the exposed ends of the wire on the armature and use plastercine to hold everything in place. the straight pins act as brushes. connecting a power supply to the pins should cause the pencil to rotate.
http://www.saburchill.com/physics/practi...
http://www.energizer.com/learning/scienc...
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