How to calculate the friction torque of the bearing?

One method of calculating the friction torque of rolling bearings is to divide the friction torque into independent parts, including the torque M0 which is not affected by the load and the torque M1 which depends on the load, and then add the two together to obtain: m=m0+m1 this method is still used today. However, if we not only consider the factors of load, but also analyze the root causes of friction in detail, we can give a more accurate calculation method. In fact, M0 represents friction other than coincidence. If the hydrodynamic component of rolling friction is added, it will also become a load related part. To calculate the friction torque of rolling bearings more accurately, four different causes of friction must be considered, m=mrr+msl+mseal+mdrag, where m= total friction torque, NMM mrr= rolling friction torque, NMM msl= sliding friction torque, NMM mseal= friction torque of seals, NMM mdrag= friction torque caused by drag damage, eddy current and splash, NMM this new method identifies each cause of friction that occurs in bearings and combines these factors. In addition, the total friction torque can be calculated by adding the friction caused by seals and other additional reasons as needed. Because this model considers each contact part (raceway and flange) separately, it is convenient to change the design and improve the surface quality, and can better reflect the improvement in the design of SKF bearings. This model is also easier to update.