DC motor
Designed to run on DC
power these motors are synchronous types, like the brushless DC motor
and the stepper motor will lock up on DC power, and require external
commutation to generate torque. Other types are purely DC and require
no commutation are the homo-polar motor or the ball bearing motor
The brushed DC motor will generate torque directly from DC power
applied to the motor leads, due to its internal commutation. A DC
electric motor is all about magnets and magnetism:
A motor uses
magnets 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.
|
