The motor part of the DC gear motor is mainly composed of base, main magnetic pole, commutation pole, end cover, bearing and brush device. According to whether it is equipped with a common brush-commutator, the DC motor can be divided into two. The category includes brushed DC motors and brushless DC motors; the motor parts of AC geared motors are not as complex as DC motors, and do not have steering gears and brushes. Therefore, they are simple in structure, easy to manufacture, relatively strong, durable, and low in energy consumption. Low noise, large torque, slow speed, AC motor divided by the main points of the main synchronous motor and asynchronous motor.