Diagnosis of root, the different configuration and application of motor rolling bearing!

Takeaway: today the content of this article is about the different configuration and application of motor rolling bearing, quite applicable experience summary, hope to help you work and study. The bearing of the motor ( The following are the rolling bearing) Is important between stator and rotor support components, to ensure motor air gap and transmit load effect on average, correct selection and application of the bearing is one of the important local motor design. According to the different characteristics of the motor, such as its structure, load types, working speed, bearing life and so on, the bearing of the motor selection is different also, as long as the choice of appropriate bearing, the intrinsic characteristics of talents play a bearing, ensure the reliable operation of motor. A, bearing configuration in order to better choose bearing configuration, must understand the bearing itself, agree. Bearing type many, here only two varieties of commonly used type of bearings, deep groove ball bearings and cylindrical roller bearing stop careful to clarify. If the application needs some special bearing, it is necessary to find relevant material, understand its characteristics. Deep groove ball bearing and roller bearing inner and outer ring is point contact. With quiet operation, low capital and can carry a range of radial load and axial load, the advantages of low friction, low calorific value, high speed turn; Its defect is unacceptable to impact load or radial and axial load. Cylindrical roller bearing and roller bearing inner and outer ring is line contact. Has the advantages of can accept radial heavy load is generally applied to large and medium-sized motor and load for belt conveyor of big small and medium-sized motor; Its defect is compared with the deep groove ball bearings, low rated speed, high noise. 1, a typical bearing configuration of motor bearing configuration is mainly with the device itself way and the size of the load of the motor, here only to horizontal IMB3 stop analysis to clarify some typical bearing configuration. 1) Deep groove ball bearings and deep groove ball bearing configuration: motor drive and the drive end adopt deep groove ball bearings, drive end for locating end, not the drive end bearing elastic preload, as shown in figure 1. Advantage is high speed, low noise, stable operation; Defect is not acceptable heavy load, radial load such as belt conveyor. This configuration is suitable for small and medium-sized motor light load of the load. 2) Deep groove ball bearing + cylindrical roller bearing configuration: motor drive end adopts cylindrical roller bearing, the drive end USES deep groove ball bearing positioning, as shown in figure 2. Advantage is the shaft extension end can accept heavy load, the motor does not demand the axial pre-tightening and reserved rotor axial thermal shrinkage clearance; Defect is the configuration of the two deep groove ball bearing noise slightly tall, allowed speed slightly low, contract must carry axial load. This configuration is suitable for large and medium-sized motor, a heavy load on the drive end. 3) Deep groove ball bearings, cylindrical roller bearings and cylindrical roller bearing configuration: motor driven end use + cylindrical roller bearing, deep groove ball bearing deep groove ball bearing and the bearing chamber radial clearance fit, and o-rings to avoid bearing outer ring rotation, the drive end USES the cylindrical roller bearing, as shown in figure 3. Advantage is the shaft extension end can accept a certain amount of axial load and radial load, axial prestressing, don't need the drive end able to withstand the thermal shrinkage of the motor rotor, defect is the noise of the machine is bigger, the probability of damage is higher ( Compared with the two bearing configuration) 。 This configuration is used for large motors. 2, the current market condition of motor bearing configuration 1) Siemens high fZSi, electric hu bearing configuration: high voltage motor adopts three bearing configuration, Bearing for the light series) , as shown in figure 4. Low voltage motor adopts two bearing configuration, as shown in figure 5. 2) ABB motor bearing configuration: low voltage H355 machine base number one H500 adopts two bearing configuration, 2 series deep groove ball bearing) , as shown in figure 6. High pressure large motor adopts three bearing configuration, as shown in figure 7. 3) Some electric high voltage motor adopts three bearing configuration, the shaft extension end deep groove ball bearings for the light series bearings, same as the Siemens, as shown in figure 8. Second, summarizes what has been discussed above, motor selecting bearing configuration, various load conditions should be allowed in preference deep groove ball bearing + deep groove ball bearing configuration. If driving end there are deep groove ball bearing radial load + deep groove ball bearing configuration can meet, should be the preferred + configuration of cylindrical roller bearing, deep groove ball bearing second choice deep groove ball bearings, cylindrical roller bearings and cylindrical roller bearing configuration or other bearing configuration.