As the motor Taizhou NSK bearing * * initial use of NU deep groove bearing, the motor allows axial movement. Bearing inner rings keep edges on both sides and outer rings do not keep edges, so the relative bearing displacement of the shaft is allowed to withstand the elongation caused by the thermal expansion of the shaft. At the same time, the bearing clearance is larger than the deep groove ball bearing, but the force of the bearing is linear, better than the bearing point.
1。电机轴承异常噪声
1. Abnormal noise of motor bearing
给水泵高压（6kV）电机YKK400-2，功率450kW，转速2975r/min。轴伸长部为深槽柱NU3E222轴承，无负泰州NSK轴承荷端采用深槽6222轴承。轴的间距为28m／s，电流波动较大。
Feed water pump high voltage (6kV) motor YKK400-2, power 450kW, speed 2975r/min. Shaft extension part is deep groove column NU3E222 bearing, no negative Taizhou NSK bearing bearing end uses deep groove 6222 bearings. The distance between the axes is 28m / s, and the current fluctuates greatly.
由于轴延伸端不能调整轴的轴向尺寸，因此泰州NSK轴承的允许间隙计算为0.7mm。当电机轴承温度达到100时，轴承值。9mm不能满足电机正常运行的要求。反复更换深槽轴承后，电机噪声没有消失，异常声循环变为4分钟。
The allowable clearance of Taizhou NSK bearing is calculated to be 0.7mm because the axle extension end can not adjust the axle size. When the motor bearing temperature reaches 100, the bearing value. 9mm can not meet the requirements of normal motor operation. After repeated replacement of deep groove bearings, the motor noise did not disappear, and the abnormal sound cycle changed to 4 minutes.
2。失效分析与处理
2. Failure analysis and treatment
根据泰州NSK轴承的特点，电机采用NU型深沟轴承，使金属电机能够轴向移动。轴承内圈具有两侧保持边缘，外圈不保持边缘，因此轴可以允许相对于轴承在两个方向上位移，并且可以承受轴的热膨胀引起的伸长。同时，轴承间隙比深沟球轴承大（或深），并有滚道间隙。施加在轴承上的不同力使路径椭圆。支护力偏大。对于深沟轴承来说，力点是一条直线。在高速运行中，由于轴承的间隙，力点发生变化，力轨迹成为抛物线。
According to the characteristics of NSK bearings in Taizhou, NU type deep groove bearings are used in the motor to make the metal motor move axially. Bearing inner ring has two sides to maintain edges, the outer ring does not maintain edges, so the shaft can allow displacement in two directions relative to the bearing, and can withstand the extension caused by the thermal expansion of the shaft. At the same time, the bearing clearance is larger (or deeper) than the deep groove ball bearing and has raceway clearance. The force exerted on the bearing makes the path ellipse. The supporting force is too large. For deep groove bearing, the force point is a straight line. In high speed operation, due to the clearance of the bearing, the force point changes, and the force trajectory becomes parabola.
进给泵电机在运行过程中主要受轴向力的影响，驱动负载稳定。深沟柱轴承径向运动减小。因此，前泰州NSK轴承的轴承间隙仍为C3，约为0.04毫米，能够满足运行要求。考虑到轴承的膨胀，深沟球轴承与滚道的接触更加不均匀，高频冲击也更大。深沟球轴承与滚道的接触点为点，高频冲击较小。因此，在这种情况下，深沟球轴承可以代替深沟球轴承。解决异常声音。
The feed pump motor is mainly affected by axial force during operation, and the driving load is stable. Radial movement of deep groove column bearing decreases. Therefore, the bearing clearance of the former Taizhou NSK bearing is still C3, about 0.04 millimeters, which can meet the operation requirements. Considering the expansion of the bearing, the contact between the deep groove ball bearing and the raceway is more uneven, and the high frequency impact is greater. The contact point between deep groove ball bearing and raceway is point, and high frequency impact is small. Therefore, in this case, deep groove ball bearings can replace deep groove ball bearings. Resolve abnormal sounds.
在槽柱轴承变为深沟球轴承后，轴承的异响消动幅值为0.013 mm，转速为2.8/s2。电机的负载性能稳定，电流波动不大。
When grooved column bearing is changed into deep groove ball bearing, the abnormal noise attenuation amplitude of the bearing is 0.013 mm and the speed is 2.8/s2. The load performance of the motor is stable and the current fluctuation is not large.
文章来自：泰州SKF轴承 www.wh-skf.com
The article is from: Taizhou SKF bearing www.wh-skf.com
文章来自：泰州INA轴承 www.ina-china.cn
The article is from: Taizhou INA bearing www.ina-china.cn
文章来自：泰州NSK轴承 www.klbbearings.com
The article is from: Taizhou NSK bearing www.klbbearings.com
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