Its composition is mainly divided into three parts: frequency conversion portal crane control system, AC asynchronous motor and mechanical system; There are two motion control modes of elevator frequency conversion door machine: "speed switch control mode" and "encoder control mode"; The "speed switch control mode" can't detect the direction, position and speed of the car door, so it can only adopt the open-loop control of position and speed, which leads to relatively poor control accuracy of the door crane and poor ride comfort in the movement process, so the "encoder control mode" is often adopted. At present, there are specific elevator door machine frequency converters on the market.
The elevator door machine is the mechanism responsible for opening and closing the car door of the elevator hall. When receiving the switch signal of the elevator, the elevator door machine controls the door opening motor through its own control system, and converts the torque generated by the motor into a force in a specific direction to close or open the door. When the closing force is greater than 150N, the door crane automatically stops closing the door and opens the door in the opposite direction, which plays a certain role in closing the door.
Elevator door machine is also called "door opener". Switch device for elevator car door.