it is obviously unscientific to talk about bearings individually, especially the planning, processing, installation and later use of the bearing room are very important elements. Selection and requirements for bearing room planning . The cooperation between the bearing jacket and the bearing inner diameter should not cause interference, but the gap should not be large. Regarding the basic series of motors, the specifications selected by many motor manufacturers and the official service of the bearing inner diameter recommended in this article are shown in the table below. The working clearance of the bearing after heating is smaller than that before use. The degree of reduction under different temperature conditions is not consistent, and different raw materials will correspond to different reductions. In order to prevent the bearing outer ring from rotating in the bearing chamber (that is, the running ring), the integrated stove motor accumulated axial clearance of the components in the bearing chamber should be moved from the bearing outer ring to the end cover or bearing sleeve, that is, the bearing outer ring should be The cover is stuck. For flameproof motors, the gap should be less than 0.2mm.
The bearing room should be as far away from the stator and rotor windings as possible, and the ventilation and heat dissipation should be good. For the motor with internal circulation ventilation, if the temperature of the bearing at one end is too high, the cooled air should be blown to the bearing as much as possible. In order to dissipate heat, when choosing a grease smooth bearing, you should not choose two bearings at the same end. The parts related to smoothness at the smooth bearing should be planned to not only contain a sufficient amount of smooth grease, but also to drain excess smooth grease. For example, the 'slick oil pan' with a slanted surface can throw the waste fat from the bearing out of the bearing chamber into the oil storage chamber of the outer cover. Regarding high-speed, high-power motors, thin oil can be used for bearing heating SmoothEasy to disassemble and disassemble. When planning the related parts of the motor, try to make the bearing be introduced into the bearing room when the device is installed, and then the rear cover into the man-machine base stop to avoid damage to the bearing when the device is disassembled. There should be room for dismantling tools at the bearing inner cover.
Add temperature monitoring equipment, but the alarm temperature should be selected according to the buried position of the temperature measuring element. Do not approach the bearing's maximum allowable temperature regardless of the buried position, such as Ordinary bearings are 95 ° C. 的 Other countermeasures to reduce the bearing system problems. The bearing distance should not be too large. If the shaft deflection is added, the bearing damage will be accelerated.The center of the motor should be as low as possible. First, the center of gravity is low and the work is stable. Second, the device is working. After that, the change in center height caused by thermal expansion is small. Motors with center height greater than 400 are installed and commissioned at room temperature and qualified for loading. After heating, the center height should be raised by 0.1-0.3mm. If the equipment being dragged cannot be raised with it, or the height is less than this value, the bearing must bear additional force, which will inevitably lead to accelerated damage. The motor itself The rigidity should be good, and no resonance should occur during the work process. The bearing parts should be well sealed. The protection level of the inner and outer covers of the motor bearings should meet the requirements of the actual operating environment. For larger motors, there should be a way to prevent shaft current To avoid accelerated bearing damage due to its electrical corrosion.