DC motor - DC motor with rotation of the motor to the DC current is called. Magnetic circuit and armature circuit linked in different ways, can be divided into the series motor, separately excited motor, compound motor, DC motor, is not only a coil, but there are many coil firmly embedded slot in the rotor core, through the current conductor in a magnetic field due to the force of rotation, bring the whole rotor. This is the basic working principle of DC motors.

DC motor from a DC power supply, the input electrical energy and output mechanical energy.

DC motors and generators, the same structure. When the rotation plus has been a DC voltage to the brush AB conductor 12 there is current flowing through the electromagnetic force law shows that the conductor by the electromagnetic force. Conductor in the N pole under brush A contact current to flow, resulting in the electromagnetic torque is counterclockwise; conductor in the S pole under brush B contact current to the outflow of electromagnetic torque is still counterclockwise. The rotor begins to rotate outward under the action of the electromagnetic torque output mechanical power.