自1968年以来,国内25吨以下中小型造纸机采用可控硅分部传动装置的数量在百台以上,各地自己搞的系统方案很多,但由于缺乏相互交流和学习,可控硅应用技术的水平发展缓慢。自七十年代双闭环调节理论在我国电气传动方面开始应用以来,它为提高系统精度和运行的稳定性、可靠性等方面带来了很大的好处。但是,由于可控硅控制系 Since 1968, the domestic 25 tons of small and medium-sized paper machines using SCR sub-transmission in the number of more than 100 units around the system to engage in their own many, but due to the lack of mutual exchange and learning, SCR application technology The level of slow development. Since the application of double closed-loop regulation theory in the seventies in the field of electric transmission in our country, it has brought great benefits in terms of improving system accuracy, stability and reliability of operation. However, due to SCR control system