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.
The following video illustrate a simple, two-pole, brushed, DC motor.A simple DC electric 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.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.
When a current passes through the coil wound around a soft iron core situated inside an external magnetic field, the side of the positive pole is acted upon by an upwards force, while the other side is acted upon by a downward force.