Research On The Control Technology Of Variable Frequency Speed Regulation System Of TC5613A Rotary Tower Crane

Tower cranes are essential component of modern construction,they are characterized by intermittent operation, frequent start-stop activity, and noticeable vibration and shock during operation. Tower cranes also feature a wide range of lighting height and rotation rates. Because there is a growing demand for safer, more efficient and more stable tower cranes, traditional methods of crane control are no longer ideal to achieve desired results.This study is part of the "small and medium tonnage luffing and slewing tower crane frequency control technology research" project by large state-owned enterprises. In order to meet the performance requirement of a tower crane during the actual manufacture,we performed the following studies on the rotary frequency control system of a TC5613 A tower crane to improve the stability of the slewing mechanism of tower crane.(1) Applied relation of asynchronous motor vector control to establish the rotation drive model of TC5613 A. Emulate the speed sensorless vector control system of rotation drive in the tower crane using MRAS-based speed identification module and we also analyze the simulation results.(2) To solve issues like large overshoots, slow responses, and poor dynamic and static properties that occur in the emulation of MRAS-based speed sensorless vector control system, we introduced fuzzy PID control into the speed identification module and rotating speed adjustment module, and set up an emulation module of MRFAS based on speed sensorless vector control system. By comparing the emulation module with or without fuzzy control, we showed that fuzzy PID control is an effective method to improve the variable speed performance of the slewing mechanism which gives much less overshoot, faster dynamic response and less state error.(3) Based on both the parameters and results of the simulation model, we performed a test on the rotary vector control system of a TC5613 A tower crane. We applied the speed sensorless vector control system of MRAS-based and MRFAS-based speed identification module into the slewing mechanism of the tower crane, and tested the reliability of the emulation results. After a second comparison of the slewing mechanism of the tower crane, we developed a deceleration control curve that provided more flexible rotatory boom for the tower crane,namely the large inertia of the drive based on flexible boom swing control technology. We also applied the improved rotatory control system to improve the efficiency of operating the primary rotatory control system. Finally, we tested the overall performance of the tower crane slewing mechanism by applying the flexible rotatory boom-control system to compare these two speed sensorless vector control systems and concluded that fuzzy control can improve the frequency control enabling better system performance.This paper mainly for stability of tower crane slewing process. First of all, we established rotary tower crane control model, carried on the simulation analysis, then, through the introduction of the fuzzy control, the comparative analysis of both control effect is that the speed sensorless vector control system with MRFAS has good dynamic performance. Finally, the result has verified in TC5613 A tower crane.