由于電機(jī)泰州NSK軸承**初采用NU型深溝柱軸承,，電機(jī)允許軸向移動(dòng),。軸承內(nèi)圈兩側(cè)保持邊緣，外圈不保持邊緣,，因此允許軸的相對軸承位移承受軸的熱膨脹引起的伸長,。同時(shí)，軸承間隙大于深溝球軸承,，但軸承的力是線性的,，優(yōu)于軸承點(diǎn)。

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,。電機(jī)軸承異常噪聲

1. Abnormal noise of motor bearing

給水泵高壓（6kV）電機(jī)YKK400-2,，功率450kW，轉(zhuǎn)速2975r/min。軸伸長部為深槽柱NU3E222軸承,，無負(fù)泰州NSK軸承荷端采用深槽6222軸承,。軸的間距為28m／s，電流波動(dòng)較大,。

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.

由于軸延伸端不能調(diào)整軸的軸向尺寸,，因此泰州NSK軸承的允許間隙計(jì)算為0.7mm。當(dāng)電機(jī)軸承溫度達(dá)到100時(shí),，軸承值,。9mm不能滿足電機(jī)正常運(yùn)行的要求。反復(fù)更換深槽軸承后,，電機(jī)噪聲沒有消失,，異常聲循環(huán)變?yōu)?/span>4分鐘。

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,。失效分析與處理

2. Failure analysis and treatment

根據(jù)泰州NSK軸承的特點(diǎn),，電機(jī)采用NU型深溝軸承，使金屬電機(jī)能夠軸向移動(dòng),。軸承內(nèi)圈具有兩側(cè)保持邊緣,，外圈不保持邊緣，因此軸可以允許相對于軸承在兩個(gè)方向上位移,，并且可以承受軸的熱膨脹引起的伸長,。同時(shí)，軸承間隙比深溝球軸承大（或深）,，并有滾道間隙,。施加在軸承上的不同力使路徑橢圓。支護(hù)力偏大,。對于深溝軸承來說,，力點(diǎn)是一條直線。在高速運(yùn)行中,，由于軸承的間隙,，力點(diǎn)發(fā)生變化，力軌跡成為拋物線,。

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.

進(jìn)給泵電機(jī)在運(yùn)行過程中主要受軸向力的影響,，驅(qū)動(dòng)負(fù)載穩(wěn)定。深溝柱軸承徑向運(yùn)動(dòng)減小,。因此,，前泰州NSK軸承的軸承間隙仍為C3，約為0.04毫米,，能夠滿足運(yùn)行要求,?？紤]到軸承的膨脹,，深溝球軸承與滾道的接觸更加不均勻,，高頻沖擊也更大。深溝球軸承與滾道的接觸點(diǎn)為點(diǎn),，高頻沖擊較小,。因此，在這種情況下,，深溝球軸承可以代替深溝球軸承,。解決異常聲音。

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.

在槽柱軸承變?yōu)樯顪锨蜉S承后,，軸承的異響消動(dòng)幅值為0.013 mm,，轉(zhuǎn)速為2.8/s2。電機(jī)的負(fù)載性能穩(wěn)定,，電流波動(dòng)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.

文章來自：泰州SKF軸承 www.wh-skf.com

The article is from: Taizhou SKF bearing www.wh-skf.com

文章來自：泰州INA軸承 www.ina-china.cn

The article is from: Taizhou INA bearing www.ina-china.cn

文章來自：泰州NSK軸承 www.klbbearings.com

The article is from: Taizhou NSK bearing www.klbbearings.com

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