SRD, as a kind of new adjusting speed system with the merit of fixation, durable, high efficiency, application to variety fields, has emerged and is different from the tradition. It maybe makes great effect in electric drive market in the future ten years.
　　---Abstract from assess of American GE company to SRD.
　　SRD, originated in early 1980’s in the world, is a new stepless variable speed system. It is mainly made up of motor and controller and has the merit of simple fixation possessed by AC motor and good performance of adjusting speed possessed by DC motor, also has higher ratio of performance and price. Since our company developed the first sample machine in 1987, we have formed four series products more than 20 specifications, which have extensive application in many fields such as machine tool, petroleum, electric vehicle, textile. The technology is up to advanced level in the world.
　　Research Institute Textile Machinery is the first organization to engage in the development and study of SRD and has created many “ the firsts” in this field in the recent ten years:
　　● In China the first unit developed industry machine and used in industry field , 1987
　　● In technology and science field of China the first unit transferred the technique to produce enterprise, 1987
　　● The first unit had its product passed appraisal in China, 1988
　　● The first unit had its product with the largest capacity –30KW in 1990,55kw in 1996, 180kw in 2000，280kw in 2003，400kw in 2004 respectively
　　● The first unit had its product series---KC series SRD , 1993
　　● Have successfully used SRD to more than 20 kinds of produce machines such as new oil pumping unit，electric vehicle, portal planer, gantry lathe, coal mine machine, reversible rolling mill etc. from 1987 to 2004