"基于PLC和变频器的电梯控制系统设计与研究"。

Abstract With the rapid development of computer technology, automatic control technology, and power electronics technology in modern society and urban life, elevators have become a symbol of urban material civilization. Especially in high-rise buildings, elevators are essential vertical transportation equipment. The traditional relay elevator control system, due to the mechanical and electromagnetic inertia of the relays themselves, greatly reduces the reliability and safety of the elevator system. In order to ensure the efficient, energy-saving, and safe operation of elevators, it is necessary to improve the elevator control method. Developed according to the needs of sequential logic control, the programmable logic controller (PLC) is an electronic device designed specifically for digital operation in industrial environments. PLC has fast processing speed, high reliability, and can ensure the normal, safe, and reliable operation of elevators. At the same time, with the development of AC motor frequency conversion speed regulation technology, the elevator's traction method has gradually transitioned from DC speed regulation to frequency conversion speed regulation. This not only meets passengers' comfort and ensures smooth precision but also reduces energy consumption, saves energy, and reduces operating costs. This article applies the frequency conversion speed control method based on PLC to the elevator system and researches this method. Keywords: Elevator; Programmable Logic Controller; Frequency Converter.