Electrically Insulated Bearing is have many kinds of insulated ball and roller bearings design. it has the same dimension and the same design with normal chrome steel bearings. but the most different is this kind of bearing with Aluminium Oxide Coating. the coating can Electrical Resistance Voltages up to 3000 V DC.
deep groove ball bearing with outer ring coating Coated outer ring Bearings with an electrically insulating coating on the external surfaces of the outer ring are the most common INSOCOAT types. They are: • Recommended for medium-sized motors using bearing sizes with a bore diameter < 120 mm • Suitable for all housing types • Can be applied to bearings with an outside diameter > 80 mm • Identified by the sufixes VL0241 and VL0246 |
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cylindrical roller bearing with inner ring coating Coated inner ring Bearings with an electrically insulating coating on the external surfaces of the inner ring provide enhanced protection against electric current damage, as the smaller coated surface area offers higher impedance. They are: • Recommended for larger-sized motors using bearing sizes with a bore diameter > 120 mm • Can be applied to bearings with a bore diameter > 70 mm • Identified by the sufix VL2071 and VL2076 |
Bearings with an electrically insulating coating on the external surfaces of the outer ring are the most common types. They are:
Electrically Insulated Bearing can protect the machine to be exposed to electrical current. In a worst-case scenario, this can damage raceways and rolling elements, which in turn, causes the motor or generator to fail prematurely and without warning. On top of the extra expenses incurred for repairs, this also means additional costs caused by machine downtime and the resulting production losses.
Electrically Insulated Bearing are not only Electrically Insulated deep groove ball Bearing,
but also Electrically Insulated Cylindrical Roller Bearing,
Electrically Insulated Tapered Roller Bearing,
Electrically Insulated Angular contact ball bearing
Electrically Insulated Thrust Roller Bearing
Electrically Insulated four point contact ball bearing,
Electrically Insulated Tapered roller bearing,
Electrically Insulated spherical roller bearings,
Hydrid bearings,
and the other type Normal or Non-Standard Electrically Insulated Rolling Bearings. they are the same dimension, same cage, same elements and the other data with normal chrome steel rolling bearing, just the different coating on the surface of the inner ring or outer ring of the Rolling Bearing.
A much more economical solution is to provide for the use of Electrically Insulated Bearing during the planning stage. This reduces maintenance and repair costs, and increases machine availability – all of which means greater value for the customer.
Application of Current Insulated Bearings
In most cases, it is sufficient to interrupt the electric circuit between the housing and shaft, in order to mount Electrically Insulated Bearing at one or both bearing locations, depending on the application.
Principle bearing types for traction motor applications
• Electrically insulated cylindrical roller bearings
• Electrically insulated deep groove ball bearings
• Hybrid cylindrical roller bearings with ceramic rollers
• Hybrid deep groove ball bearings with ceramic balls
• Traction motor bearing units based on cylindrical roller bearings and
deep groove ball bearings
• Sensorised traction motor bearing unit
• Regreasable traction motor bearing unit
