... Open loop system. The performance is abosolutelydefferent with normal inverter motor. It is used on numrecalmachine tools. Building material ... machinery, heavy industry, such asmetal, etc. GM7 inverter (spindle) motor , it is compose with stator,rotors,low noise ... density2.Specail design for electronics-magnet vibration, low noise, high rotation resolution, enough constant speed range and constant ...