Y series three-phase asynchronies electromotor Y2 series three-phase asynchronies electromotor         YD series grade-change multi-velocity three-phase asynchronies electromotor YCT series electric magnet velocity-adjusting electromotor     YEJ series electric magnet trig three-phase asynchronies electromotor TYNC series oil-drawing machine three-phase permanent magnet synchronization electromotor     YVF series frequency-changing velocity-adjusting three-phase asynchronies electromotor