The key to the structure of an electric glass lifter is the electric motor and reducer, which are assembled together. The electric motor adopts a reversible permanent magnet DC motor, which has two sets of magnetic field coils wound in different directions. It can be controlled to rotate forward and backward through a switch, that is to say, it can control the rise or fall of door and window glass. The electric motor is controlled by a dual switch button and has three working states: up, down, and off. When the switch is not operated, it automatically stops at the off position. The control circuit is equipped with a main switch (central control) and a branch switch, both of which are connected in parallel.