Door Controller

Door Controller can be roughly divided into two methods - open loop and closed loop control methods, which are used with different door opener structures.
Open Loop Control
The so-called open loop control means that the motor is not equipped with a speed feedback device (Feed Back Device). The controller is only responsible for providing a fixed voltage to the motor without any speed compensation. In the past, when control electronic technology was less developed, it was more difficult to control the acceleration and deceleration of the motor. In order to achieve rapid and smooth acceleration and deceleration when opening and closing the door, a linkage group mechanical structure was used to generate a similar sine wave acceleration and deceleration to achieve a comfortable door opening and closing action.

There are roughly two types of motor control technologies currently in use:

1) DC motor

2) Three-phase AC induction motor

Comparison table of various features:
Motor cost Controller cost Motor efficiency Operating characteristics
DC motor High Low 70~80% better
Three-phase AC induction motor Low High 60~70% Poor

Type

TDM

tdm