YD series variable pole multi-speed three-phase asvnchronous motors are one of the main series productsderving from three-phase.This kind of motor can change rotational speed to meet the requirements of loadstate,so that they can property match the demands of power and simplity adjustable speed system,They arewidely used in such industrial and agricultrral departments, as machine tools,mining metallurgy, spinning andweaving, printing adn dyeing, chemical industry and agricultural machinery,etc.For similar correspondent relationship between power rank and insulation dimensions, YD series motors areequivalent to other foreian advanced machines,and therefore thev are matching with sinale-machine or machine tool for export as well as spare motors for similar types imported from abroad.