See how good electric insulation bearing FAG!

See how good electric insulation bearing FAG! 2019 - 09 - 05 over current often occur in the round of bearing and traction motor ( Railway vehicles) , dc and ac motor ( Power transmission system) And the generator ( Wind power) On. CLP flows may cause the damage of the raceway and rolling body and aging of lubricant, thus cause the malfunction of the motor or generator early result in an increase in maintenance costs and bring the loss caused by production downtime, etc. Motor, generator and some other related equipment used in the rolling bearing, in the process of use is likely to be affected by the current through the, this will not only damages to the rolling element and raceway of bearing, but also will affect the performance of the grease. Figure 1 is a FAG from 6319 bearing on a user motor products are electric corrosion products use less than a week. Leakage current bearing damage will affect the motor vibration is unusual, the noise increased. Motor does not work. Figure 1 a current leakage form the inner ring rolling on corrugated grooves and the color darkened ball completely eliminate bearing internal potential difference is generally very difficult, but can prevent or greatly reduced through bearing current, can prevent the corrosion of the bearings. Along the shaft of the induced voltage will produce at the same time, through the bearing, bearing and bearing B current loop, as shown in figure 2. One reason for this kind of shaft voltage generated is due to the uneven distribution of motor internal magnetic flux, especially in some very logarithm less motor. This case, as long as the insulation end bearing can be completely cut off the current loop, usually the drive end bearing insulation. If the voltage between the shaft and bearing seat, the current through each bearing will be in the same direction, in this case, the motor at the ends of the bearing should be insulated. As shown in figure 3. Figure 3, figure 2 along the shaft of the induced voltage of between shaft and bearing voltage selection decision factor is the current time characteristic of the insulation. If it is a dc voltage or low frequency ac voltage, the insulation material of the effect depends on pure resistance; If it is the high frequency ac voltage ( The common use of frequency converter device) , depends on capacitive reactance value of the insulating layer. Was looking at these too professional, but we just have to deal with their products, that is electrical insulation bearing. Both inner ring and outer ring bearing are called insulation bearing with ceramic coating. Ceramic coating can prevent current through, has the ability of insulation. Hybrid bearings made from ceramic roller, the rolling body to prevent an electric current passes through, so also have insulation capability. FAG bearing insulation is outer or inner ring with ceramic coating Insutect standard bearing, as shown in figure 4 and figure 5. And has the following features. Figure 4 with ceramic coating of deep groove ball bearings with ceramic coating figure 5 pieces cylindrical roller bearing good insulation performance: with ceramic oxide coating bearing with suffix ( J20） , this kind of coating by plasma spraying coating on the surface bearing. The ceramic oxide without high hardness, wear resistance and good heat transfer performance. Insulating layer J20AB: outer ring coating can prevent along the shaft of the induced voltage cause bearing corrosion. Due to the use of special sealing process, so even in the humid environment J20AB coating can still have a very good insulation effect. Insulating layer J20AA: is outer coating, coating thickness is 2 times of J20AB thickness. Can therefore be at a higher frequency of the axial flow, it still has very good insulation effect. Insulating layer J20C: with J20AA insulating layer thickness is the same. Just ring inside insulation coating. Because the coating area is small, so to prevent the high frequency of shaft current effect is better. Especially in the occasion of high frequency axis and outer ring spinning current. Insulating layer J20A and J20B: J20A used in the insulation of the large size bearings; J20B for people who need to general situations of the insulation. Mixer FAG coating insulation bearing dimension can be bearing interchange and standards. 62 series of deep groove ball bearings have insulation bearing with coating, can also deal with seals on one or both sides of the insulation bearing order. FAG bearing of insulation coating by plasma spraying technology, can make a very solid oxide coating adhesion on the substrate material. Base material need polished rough ahead of time. The final coating through a sealing process is needed. Type of coating product as shown in figure 6. Figure 6 coating type (1) outer insulation J20A, J20B, J20AB, J20AA; (2) inner ring J20C insulation insulation performance of different types of coating bearing parameters see table: note that you need to do to coating the surface of the insulation bearing ring must be cylindrical, and there can be no oil groove and oil hole. FAG company with a coating of insulation bearing performance is superior, the use of different environment and require more segmentation, as long as there is need to equipment, there is always a kind of product can meet your requirements, prevent the corrosion current. Hk united bearing focus bearing industry informationization service nearly 20 years, with many excellent bearing enterprise grows together, also witnessed China's bearing production technology from low to high development process. We will adhere to continue, the steadfast work, don't, don't give up, for the benign development of Chinese bearing industry do render some. Hk united bearing network bearing engineers, 2019. 03. 01