The traditional DC motor with carbon brushes is still a frequently used motor today, especially in the lower power range. A reason for us to learn the different DC motors types, how they work and how you can control the direction of rotation and speed of this motor.
When the coil is powered, a magnetic field is generated around the armature. The left side of the armature is pushed away from the left magnet and drawn toward the right, causing rotation.The armature continues to rotate.Watch the video from learnchannel for more info:
When the armature becomes horizontally aligned, the torque becomes zero. At this point, the commutator reverses the direction of current through the coil, reversing the magnetic field.The process then repeats.
Brushed DC motors can be varied in speed by changing the operating voltage or the strength of the magnetic field. Depending on the connections of the field to the power supply, the speed and torque characteristics of a brushed motor can be altered to provide steady speed or speed inversely proportional to the mechanical load.