日本芝浦电气公司研制成机床主传动用的六种交流调速电动机。该机采用封闭式交流电动机和巨脉冲晶体管逆变器,体积小、重量轻、维修方便。功率为3.7～18.5千瓦。其特点是: 1)通过控制差频来扩大速度控制范围(30～3600转/分),用 NC指令可自动调速,省掉了齿轮,故能实现平滑运转;2 Japan Shibaura Electric Company developed into the main drive with six kinds of exchange speed motor. The machine uses a closed AC motor and giant pulse transistor inverter, small size, light weight, easy maintenance. Power is 3.7 ~ 18.5 kilowatts. Its features are: 1) By controlling the frequency difference to expand the speed control range (30 ~ 3600 r / min), with NC instructions can automatically speed, save the gear, it can achieve smooth running;