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Why use Electrically Insualted bearing for electric motors?
Electrical corrosion is a well documented cause of bearing damage, occurring when an electric current passes through a bearing. Increasing power density in electromotors, in combination with thyristor and transistor power control lead to high risk of bearing damage due to the passage of electric current. In motors of substantial power, voltage differentials will almost always occur,even if the winding is nearly perfect. Bearing damage through electrical corrosion occurs frequently in traction motors, powerful electromotors, generators and wheel bearings of motorised railway rolling stock. But also the erroneous placement of an earthing clamp when welding machine parts can lead to this type of damage. Depending on the required level of operational continuity and the cost of repairs, this type of damage could be prevented. A carbon slip ring, deviating current away from the bearing, is a damage could be prevented. A carbon slip ring, deviating current away from the bearing, is a rather common and simple solution. Unfortunately, simple wear will often render this ineffective after some time in operation. firstname.lastname@example.org, skype--lisa.bearings