High precision 6313M/C3VL0271 6313M/C3J20C 65x140x33mm electric insulated bearing for Hydrogenerator

What are insulated bearings?
The so-called insulating bearing refers to the general term for bearings that can block the current passing through the bearing itself and have insulating properties. Its insulation performance is usually ensured by coating a layer of insulating material on the outer or inner ring of the bearing using a special process, or the rolling elements are made of ceramics.
Under what circumstances should insulated bearings be used?
Even if the production of the motor is strictly controlled during the manufacturing process, it is difficult to completely avoid the magnetic asymmetry of the armature and the rotor. This asymmetry will generate a voltage between the stator, which will generate a current passing through the bearings, especially in AC motors. In severe cases, this current will cause corrosion pits, melt marks, electric corrosion filings, discoloration, damage and other damage on the surface of the bearing raceway and rolling elements. Of course, motors using inverter and frequency conversion technology will also produce this phenomenon. In order to block this current from flowing through the bearing, it is necessary to cut off its circuit, so insulated bearings and insulated bearing chambers came into being. The insulated bearing chamber is made of insulating material with a certain hardness in the bore and end face of the bearing chamber.