可控硅传动Ⅱ系列产品(双环模拟量反馈系统)已基本定型,精度约为1～2%。但为适应四个现代化的需要,有关部门目前又进一步研究拟定Ⅳ系列产品——高精度调速系统。我们认为,这里有两个问题需要解决:首先是如何采用先进技术,在简单可靠的前提下达到高的精度;其次,也是一个非常重要的问题,就是在拟定系列产品时,应当参照单元组合仪 SCR drive Ⅱ series (double loop analog feedback system) has been the basic shape, the accuracy of about 1 to 2%. However, in order to meet the needs of the four modernizations, relevant departments are currently studying and formulating IV series products - high-precision speed control systems. In our opinion, there are two problems that need to be solved: firstly, how to adopt advanced technology to achieve high precision under the premise of simple and reliable; secondly, it is also a very important issue that we should refer to the unit combination