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In terms of its function, it should be a support, which is literally used to support the shaft, but this is only a part of its function. The essence of support is to be able to bear radial loads. It can also be understood as being used to fix the shaft. The selection of bearings for quick and easy automation is included. It is to fix the shaft so that it can only rotate and control its axial and radial movement. If the motor does not have bearings, it cannot work at all. Because the shaft may move in any direction, and the motor requires the shaft to only rotate during operation. In theory, it is impossible to achieve the effect of transmission. Moreover, bearings can also affect the transmission. In order to reduce this impact, good lubrication must be achieved on the bearings of high-speed shafts. Some bearings already have lubrication, called pre lubricated bearings, while most bearings must have lubricating oil. During high-speed operation, friction not only increases energy consumption, but also makes it easy to damage the bearings. It is one-sided to turn Sliding friction into rolling friction, because there is something called sliding bearing.