Processing measures to reduce motor bearing noise

Processing measures to reduce the noise of deep groove ball bearings With the continuous improvement of people's living standards, motor noise control has become an indispensable and important technology, especially for motors running in residential environments, which have more stringent requirements.
1. Solve the mechanical imbalance of the rotor to effectively control the noise. The imbalance of the rotor should be minimized as much as possible, otherwise the balancing accuracy will be low. The balancing accuracy is related to the specifications, properties and use conditions of the motor. The larger the ratio of the diameter to the length of the rotor core, the greater the centrifugal force and the higher the balancing accuracy. The higher the rotor speed, the higher the balancing accuracy requirement. The basic conditions of the motor during use, such as the poor rigidity of the bearings and the supporting parts, require high balancing accuracy.
2. The methods to reduce bearing noise can mainly start from the following aspects
(1) Pay attention to the selection of bearings. During the operation of most motor bearings, the vibration level of the bearing will increase with the increase of the inner diameter of the bearing. For every 5mm increase in diameter, the vibration increases by about 1 to 2dB.
(2) Pay attention to the size of the radial clearance of the bearing. Excessive radial clearance will cause low-frequency noise to increase, while too small clearance will cause high-frequency noise to increase. In order to reduce the vibration and noise of the bearing during rotation, the radial working clearance of the bearing should be controlled within the range of 1 to 9 μm.
(3) Appropriately pressurize the bearing. The purpose is to eliminate the axial clearance of the rotor. Usually, wave spring washers or three-point elastic washers can be used and placed at the shaft extension end.
(4) For motors with higher noise requirements, silent bearings should be used. When the load is small, oil-containing sliding bearings can be used. Its noise is usually about 10dB lower than that of rolling bearings of the same size.