An electric motor is all about magnets and magnetism: A
motor usesmagnets to create motion. If you have ever played with magnets
you know about the fundamental law of all magnets: Opposites attract and likes
repel. So if you have two bar magnets with their ends marked "north"
and "south," then the north end of one magnet will attract the south
end of the other. On the other hand, the north end of one magnet will repel the
north end of the other (and similarly, south will repel south). Inside an
electric motor, these attracting and repelling forces create rotational
motion.
In the above diagram, you can see two magnets in the motor:
The armature (or rotor) is an electromagnet, while the field magnet is a
permanent magnet (the field magnet could be an electromagnet as
well, but in most small motors it isn't in order to save power).
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