Application of high-precision vector control in ethyl acetate production

Raw material conveying and proportioning are important link in ethyl acetate production. In these parts, high-performance motor drive mechanisms are needed which are used to provide high-precise speed and stable toque output, especially in the low frequency situation. Meanwhile it is required that the drive mechanisms should also provide parameters like current, torque and other analog as well as digital signal to distributed control system(DCS) or other production control systems. It is hard to meet the requirements by using common inverter. Accordingly, a new motor diver system was designed. The nonlinear, strong coupling characteristics were founded by analyzing the math model of AC induction motor. Because it was difficult to control well by using common method, Clarke's and Park's transform was used for decoupling, a field oriented control algorithm was introduced, a current-speed double closed-loop scheme was proposed, and software was written based on digital signal processor(DSP), and finally the inverter was developed. The device was used in the ethyl acetate production process. From the results of the present production, it is shown that the device has high control accuracy, dynamic response over wide frequency and stable operation. The general performance of that is better than normal V/F, and it has a certain value for popularization. © All Rights Reserved.