Insulated bearing has NOT stopping in 2018

Electric motors, generators and associated equipment are at risk when an electric current passes through their bearings. This can damage the contact surfaces of rolling elements and raceways in the bearings (electrical erosion) and rapidly degrade the grease. An additional risk in electric motors and generators comes from high frequency currents caused by the inherent stray capacitance. The risk of damage increases where the application uses a frequency converter. Thus here come INSULATED bearings, which usually meanscoated bearings, ceramic hybrid bearings or full ceramic bearings.Worldwide famous insulated bearing producers include SKF (INSOCOAT Bearing), NTN (MEGAOHM Bearing), FAG (J20A/B/C Bearing), NKE (SQ77/E Bearing) & etc.Here we take item 6226M/C3VL0241 for example:

Basic technical data for reference:Coating Layer Thickness: 0.2-0.4mmBreakdown voltage: min 1000VElectrical resistance: min 50MΩInsulated Material: Zirconia/ Alumina/ Titanium oxideTypical applications: Traction motors of railway vehicles/ Electric motors (AC/DC)/ GeneratorsDifferent meanings of suffix in Worldwide brands:

SKF INSOCOAT Bearing VL0241:  >1000V DC,  >50MΩ, outer ring insulatedVL2071:  >1000V DC,  >50MΩ, inner ring insulatedVL0244:  >2000V DC,  >150MΩ, outer ring insulatedVL2074:  >2000V DC,  >150MΩ, inner ring insulatedVL0246:  >3000V DC,  >50MΩ, outer ring insulatedVL2076:  >3000V DC,  >50MΩ, inner ring insulated Know more

FAG Insulated Bearing J20C: insulation on the inner ring  6332-J20C-C3/ 6328-M-J20C-C3/ 6332M.C3.J20CJ20C/ J20A/ J20AA/ J20B: insulation on the outer ring6220-2RSR-J20AA-C3/ NU214-E-M1-F1-J20B-C4  Ceramic Hybrid Bearing: HC6214-M-P6-C3 Know more

NKE Insulated Bearing Insulation on the outer ring: SQ776330M/C3SQ77   6330-M-C3-SQ77Insulation on the inner ring: SQ77E6330M/C3SQ77E   6330-M-C3-SQ77EHybrid Bearing: 6302SQ77BKnow more

Typical items in different applications:Wind turbine generators: 6326C3VL2071，6328C3VL2071，6330MC3VL2071，6332MC3VL2071Electric motors: 6317MC3VL0241，6319MC3VL0241，6322MC3VL0241，NU330ECMC3VL0241Traction motors of railway vehicles: 6016MC4VL0241，NU214MC4VL0241，6311MC4VL0241

Installation Notice:1.     Installation: Insulated bearing is of high precision, wrong installation easily leads to bearing raceway damages. These bearings should be installed with help of special molds carefully.2.     Prevention: Dynamic balance measurement for generators should be done before bearing installation in order to avoid iron fillings occurred during dynamic balance measurement running into the bearings.