1·This article is about the research of space control in the variable speed constant frequency wind energy conversion system.
本文主要研究了变速恒频双馈风力发电系统中的矢量控制。
2·Tension system of gravure printing machine is a nonlinear system with variable parameters, the change of this system is very wide, so the author USES frequency conversion motor as its executive body.
印刷机张力系统是个变参数的非线性系统，它变速范围大，所以采用的是变频器驱动交流电机作为执行机构。
3·Strong Russia promote system equipped with infinitely variable speeds, by gear wheel motor that controlled by frequency conversion.
强俄提升系统配备无级变速，由变频控制的减速齿轮马达驱动。