The safety and reliability of the door opener largely d […]
The safety and reliability of the door opener largely depends on the reliability and safety of the door opening system; the traditional door opening system mostly uses a crank slider mechanism or a crank rocker mechanism as the driving mechanism, and the drag system mainly uses a DC motor to pass through it. Armature series and parallel resistors are used for step-down and speed regulation. In the previous period, there was also a voltage and speed regulation method using PWM pulse width modulation technology.
The speed reduction mechanism of the door opener mainly includes chain drive, belt drive and gear drive. The above-mentioned door opener system is complex in structure, low in efficiency, and poor in speed regulation performance. Especially when running at low speeds, due to the use of series and parallel resistors to achieve speed regulation, the mechanical characteristics of the motor are very soft, and the speed is often adjusted properly, and the torque is Insufficient, resulting in the door opener often cannot be reliably in place. After showing the operation, the door opener does not run, or the door crashes after the speed is high.
With the increasing maturity of AC frequency conversion speed control technology, the cost of its products has dropped significantly. The use of VVVF technology to directly drive the door opener through the synchronous toothed belt (ie horizontal drive mode), not only can make the mechanical structure of the door opener device Simplification, reduced manufacturing cost, convenient installation and debugging, reduced failure rate, no impact during the closing of the door opener (zero-speed shutdown), low noise, and reliable closing in place, thus ensuring the reliable operation of the door opener. Sex. The realization of this is completely dependent on the automatic torque boost, slip compensation and high output torque of the VVVF gate control machine at low frequencies.