Yd series electric motor The dimentions of mounting and contour, insulation class, protection grade, cooling form, structure and mounting type, condition for use, rated voltage and rated frequency of YD series chang-pole multi-speed three-phase induction electric motors are all the same as that of Y series (IP44) electric motors. The YD series electric motors can apply to various transmission mechanism, the speed of which needs regulating grade by grade. For our service, please do not hesitate to contact us.