What are NKEN Insulated Bearings?
On the basis of maintaining the excellent mechanical properties of traditional bearings, insulated bearings effectively improve the electrical insulation properties of the bearings through the use of special insulating materials and process treatments, thus significantly reducing the risk of galvanic corrosion and extending the service life of the bearings.
How NKEN Insulated Bearings Work
●Insulation coating: NKEN insulated bearings in the bearing inner ring, outer ring, or rolling body surface are coated with a layer of insulating coating, usually ceramic materials (such as aluminum oxide) coating; the thickness is generally between 50 to 200 microns. This layer of coating is responsible for the electrical insulation function and can effectively block the current through the path of the bearing.
●Insulating Properties: The insulating coating has excellent insulating properties and is resistant to electrical jump fires at up to 1000V or even higher voltages. Thicker coatings can provide higher voltage tolerance, further enhancing the insulating effect of the bearings.
Importance of electrical insulation properties
The importance of the electrical insulation properties of NKEN insulated bearings is reflected in a number of ways:
●Prevention of current leakage and electrical accidents
Electrical insulation is the process of separating the conductors of an electrical component or equipment from the rest of it, and it is important to prevent electric current from passing through components or structures that should not be energized, thus preventing electric shocks and other electrical accidents.
●Improving the reliability and durability of motors and electrical equipment
NKEN insulated bearings can effectively avoid the galvanic corrosion effect of shaft current on bearings and prevent damage caused by current to grease and rolling elements and raceways, thus enhancing the reliability and durability of motors and electrical equipment.
●Reduction of electrical noise and electromagnetic interference
NKEN insulated bearings use special insulating materials and coating technology, which not only have good electrical insulation properties but also can effectively reduce electrical noise and electromagnetic interference. This is of great significance for improving the efficiency of motors and electrical equipment and reducing energy loss.
●Adaptation to harsh working environments
NKEN insulated bearings use special insulating materials and coating technology to maintain stable insulating properties in harsh environments such as high temperatures, extreme cold, and corrosion.
●Enhance the overall performance of the equipment
NKEN insulated bearings are used in electric motors and electrical equipment because of the advantages of excellent electrical insulation properties, reliability and durability, which help to improve the overall performance of the equipment and bring greater economic benefits to the enterprise.
Applications for NKEN Insulated Bearings
NKEN-insulated bearings are used in applications such as automobiles, mechanical motors, wind power generation, electronic equipment, etc. They are capable of effectively supporting rotary and reciprocating motions, providing excellent performance and long-lasting durability in a variety of applications.
●Insulated bearings for variable frequency motors
Ceramic-coated insulated bearings for inverter motors are coated with an insulating ceramic material on the outer ring of the bearing so that electric current cannot pass through the bearing and does not cause galvanic corrosion. NKEN insulated bearings have been successfully applied to inverter motors mounted on general industrial machinery such as pumps, compressors, and fans and have demonstrated excellent performance. These products are particularly suitable for industrial applications that require high reliability and long life. NKEN has also developed “low-loss bearings for energy-saving motors” that reduce friction losses within the bearing, thereby improving the motor’s energy-saving effect.
●Insulated bearings for rail transportation
Traction motor bearings in rail transportation must be powerful, environmentally friendly and cost-effective. The weight of the rail vehicles and long maintenance-free operating times must be taken into account to ensure a high degree of reliability and safety. In addition to reducing the weight of the drive train, traction motors in rail transportation are subjected to high radial and axial loads, as well as strong currents and the possibility of high-speed passage. To meet these demanding requirements, NKEN has developed insulated bearings with ceramic coatings and high-strength cages. Traction motor bearings often fail due to damage caused by the passage of electric current (electrical pitting). To prevent electrical pitting, NKEN has developed insulated bearings with ceramic coatings and PPS resin coatings. Both solutions provide high insulation resistance in excess of 100Mohms and a breakdown voltage of 4KV at access.
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