本系列電動(dòng)機(jī)外形及安裝尺寸、絕緣等級(jí)、防護(hù)等級(jí)、冷卻方法、結(jié)構(gòu)及安裝型式、使用條件、額定電壓、額定頻率等與 Y 系列（ IP44 ）電動(dòng)機(jī)相同，適用于需要逐級(jí)調(diào)速的各種傳動(dòng)機(jī)構(gòu)。

YD series change-pole multi-speed three-phase induction motor's, the dimensions of mounting and contour, insulation class, protection grade, cooling form, structure and mounting type, condition for use, rated voltage, and rated frequency of this series motors are all the same as those of Y series(IP44) motors, They can apply to various transmission mechanism, the speed of which needs