Bearings should be supported in terms of their function, that is, literal interpretation is used to support the shaft, but this is only part of its function. The essence of support is to be able to bear radial loads. It can also be understood that it is used to fix the shaft. It is the fixed shaft that allows it to only rotate and control its axial and radial movement. The consequence of the motor without bearings is that it does not work at all. Because the shaft can move in any direction, and the motor requires the shaft to rotate only when it is working. In theory, it is impossible to realize the function of the transmission. In addition, the bearing will also affect the transmission. In order to reduce this effect, good lubrication must be achieved on the bearings of the high-speed shaft. Some bearings have been lubricated, called pre-lubricated bearings. Most bearings must have lubricating oil. When the load is running at high speed, the friction will not only increase the energy consumption, but also the terrible is that it is easy to damage the bearing. The idea of turning sliding friction into rolling friction is one-sided because there is something called a sliding bearing.