Shunt wound motor is a kind of DC motor designed based on the principle of parallel coils. It consists of a stator and a rotor, and there are two coils around the stator, namely the main coil and the field coil. The cover pole motor can control the speed of the motor by adjusting the resistance ratio between the main coil and the field coil. In a cover pole motor, the rotor is enclosed in a metal frame, which is called the cover pole.