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Can anyone explain why slip ring motor use reostat?! in factory there is a big motor 6MW and near has a reostat. why called SLIP RING MOTOR?

thanks for response. the model of stabilizer is SDC 3000VA and it is not function for my inverter but my friend has another stabilizer that is model SDR 3000VA and the inverter work perfectly. I dont know the difference betwen two models, THE BRAND IS KEBO/. guess that initials  SDC and SDR...

https://www.alibaba.com/product-detail/KEBO-AVR-5000VA-AC-Automatic-Voltage_60665078101.html?spm=a2700.7724857.normalList.1.616d748fhMbKos EXAMPLE 

WHAT DOES IT MEAN SDR , SDC AND ACH INITIALS FOR VOLTAGE STABILIZER? THANK YOU!