A bearing is a part that supports a shaft, guides its rotation, and also withstands the empty rotation of the shaft. There are four types of bearings commonly used in electric motors, rolling bearings, plain bearings, spherical bearings, and oiled bearings. The most common type of motor bearing is a rolling bearing, also known as a deep groove ball bearing. The selection of deep groove ball bearings can be further categorized into: miniature deep groove ball bearings (ID 1~9mm), deep groove ball bearings (ID 10~160mm), and thin-walled deep groove ball bearings (67/68/69/ET/ER series). Regardless of the size of the motor bearings used, the requirements for the bearings are low friction, long life and high speed. The basic factors that affect the bearing noise rotation flexibility are mainly the precision of the bearing, the clearance of the bearing, the grease of the bearing and other factors. Bearing precision refers to the tolerance range of the bearing, the higher the precision, the smaller the tolerance range. Bearing precision is divided into P0/P6/P5/P4/P2, of which P0 precision is the conventional precision level, the general model is not shown behind the rest of the precision P letters behind the smaller the number, the higher the precision level, the smaller the tolerance value. Conventional motor bearings selected precision grade P5, P4 grade. Bearing clearance is divided into radial clearance and axial clearance. When the deep groove ball bearing has a large radial clearance, has the performance of angular contact bearing, can withstand a certain axial load. Clearance value: the conventional clearance value is C0, the larger the clearance, the bearing shaking is big, in the operation process of the noise generated by the conventional standard clearance will be relatively large. Conventional motor bearings selected for the clearance value of C0 clearance.

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