Application of Senlan inverter in gantry milling machine: Gantry milling machine is a machining equipment for processing larger workpieces. Its electrical control system includes two parts: the main drive of the worktable and the logic control of the feed mechanism. Henan Jiaozuo Maike Company has a gantry milling machine that has been used for many years since the 1970s. The main drive of the worktable of the gantry milling machine adopts a DC reversible speed regulation drag mode. The early DC speed control system was composed of discrete components. After several years of use, the failure rate increased significantly, the maintenance workload continued to increase, and the downtime hours due to failures increased sharply, which seriously affected the normal production. The original DC speed control system has been eliminated, and it is impossible to replace the DC speed control system. Technical transformation is an inevitable choice. 2. Transformation plan For the transformation of the DC speed control system, if the DC motor is retained, the speed control system can use a digital thyristor DC speed control system, such as Eurotherm 590A, Siemens 6RA70, ABB DCS400, etc. The advantage of this solution is that it uses the original DC motor, which is economical, but the disadvantage is also obvious. The disadvantage is that the maintenance workload of the DC motor is greater than that of the AC asynchronous squirrel cage motor, especially the DC motor that has been used for many years, the commutator is seriously worn, and the maintenance cost is higher. Another solution is to use an AC speed control system, replace the main drive DC motor with an AC asynchronous squirrel cage motor, and use a frequency converter for the speed control system. The disadvantage of this solution is that in addition to the frequency converter, the DC motor needs to be replaced with an AC motor, and the cost of the transformation is relatively high. However, the AC motor has a simple structure, low maintenance, and excellent performance of the frequency converter, which is easy to achieve optimal control. After comparing the advantages and disadvantages of the two solutions, the transformation solution using AC speed control was selected.
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