... YRKS Series High/Low Voltage Motor, Slip ring AC Motor,Metallurgy,Cement making,Plastic extruder,Industrial ... 500-10000kWProtection Class: IP21IP23IP44IP54Bearing Structure Type: Rolling Bearing or End-shield Type Sliding BearingCooling Type: Natural Ventilated, Air to ... Air Cooling, Air to Water CoolingFrequency: 50HZ,60HZ YR YRKK YRKS Series High/Low Voltage Slip ring ...