A good design must also be guaranteed by a well-organized production. Later installation and use also directly affect the service life of the motor shaft. The accuracy of motor production and processing parts and components directly affects the quality of the motor, especially in the links related to bearings, and it is even more cautious. Countermeasures during production and processing ●The motor assembly site should be kept clean. After the motor bearings are coated with grease, no dust is allowed to fly on the site. The components matched with the motor bearings must be strictly inspected before they can be assembled, and no small link can be ignored. For example, if the shaft shoulder where the rotating shaft and the bearing cooperate, if there is no rounded corner, stress concentration will easily occur during operation, and the shaft will be twisted here; The interference of the inner ring will be out of tolerance, or the bearing will not be in place, which are the bane of premature bearing damage. ●Dynamic balance quality is a crucial factor affecting bearing life. The larger the motor, the higher the speed, and the higher the quality requirements for dynamic balance. ●Parts related to the bearing - the coaxiality of the frame, end cover, rotor, inner and outer cover of the bearing should be good, and ensure that the motor will not be damaged due to the deformation of the components during the operation of the motor. Parts with larger sizes, such as machine bases and end caps, must be aged. ●The machining accuracy of components related to bearings should be improved. Because the machining accuracy of the bearing itself is very high, and when the bearing is matched with the relevant parts, a very small amount of interference will cause damage to the bearing. Practice has verified that the tolerance zone can be controlled within the range of about 0.02mm by using CNC machine tools with 'fixed-size tools' to process the bearing chamber. The roughness of the mating part with the inner and outer rings of the bearing should also be improved as much as possible, otherwise, after the 'knife peak' of gold processing is ground off after repeated disassembly and assembly, the matching tolerance of the original design will also change. ●Appropriate amount of grease should be used, otherwise the bearing will heat up. If the ambient temperature is higher than 40 ℃, the grease with higher penetration should be used. Instead, use a lower penetration or special grease. Bearing storage precautions Bearings should be stored in a dry warehouse with a relative humidity of not more than 60% and a temperature of 8~30℃. It can be stored for 6 to 8 months under such temperature and humidity. If the warehouse conditions are very standard, it can be stored for one year without rusting. Otherwise, the anti-rust oil should be reapplied every 6 months or so. The temperature of the warehouse should be low to prevent the loss of bearing oil film and rust. Installation and debugging of the motor ●For the cement foundation, the iron ground and the cement foundation are integrated, only fine-tuning gaskets can be placed between the motor and the iron ground, and no spacers such as channel steel should be placed due to the height of the motor center. Too many layers here will easily destroy the coaxiality between the motor and the driven equipment, and the motor itself is also prone to vibration. If the motor and the dragged equipment are installed and started in the hot state, if it is found that the sound and vibration values ​​are quite different from those in the cold state, after the heating of the motor tends to be stable, a secondary correction should be performed in the hot state. Spend. Fault diagnosis and repair and prevention Before the bearing part fails, there are generally two symptoms: abnormal noise; sudden heat. If the bearing is damaged, it is easier to replace the bearing on site; if the bearing inner cover is ground with the shaft, it is more difficult to repair the explosion-proof motor, especially the explosion-proof motor, because of the damage to the explosion-proof surface. Therefore, for explosion-proof motors with larger capacity, temperature monitoring devices are added to the bearing parts.
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