gweice 发表于 2009-12-19 21:36

请教：滑动轴承电机径向水平振动大

单开一台滑动轴承电机，3000RPM，电机四个底角支撑在2根槽钢上，现在测得垂直方向振动较小，水平径向振动很大，具体数据如下

速度mm/s
轴向
径向
垂向
电机前轴承
7.5
5
2.5
电机后轴承
4.9
10.3
3.2
电机前左脚
2.3
6.3
2.5
电机前右脚
3.2
6.3
2.4
电机后左脚
2.3
10.8
3.7
电机后右脚
3.2
9.4
3





请教这是由于电机本身故障引起的振动过大还是机组水平支撑刚度不够？
2、测得槽钢上的振动情况和四个底角的振动速度基本一致
3、奉上BK测的振动频谱，请后缀名为.doc改为.rar, 然后解压缩即可

四十不惑 发表于 2009-12-20 08:22

支撑刚性差！

gweice 发表于 2009-12-20 11:08

另外电机运行100多小时，但是4个底角螺栓已经振松了，电机的后轴承有漏油的现象
以上数据是在紧固底角螺栓之后测得的数据

hanhuang 发表于 2009-12-20 13:10

电机地脚没垫实，地脚螺栓不紧

huang9057 发表于 2009-12-21 10:22

重新安装电机，检查槽钢支架及基础，先把电机地脚振动降到1mm/s以下，一般越是高转速电机，安装不良对其影响越大。

黑云 发表于 2009-12-21 11:52

回复 楼主 gweice 的帖子

很有可能是基础松动，换个位置重新装置，检测一下，看有什么变化！

houngcc 发表于 2009-12-21 13:51

from:An Analytical Approach to Solving Motor Vibration Problems
page8:
Forcing Frequency Response Vibration
Weak Motor Base:
If the motor is sitting on a fabricated steel base, such as a slide base, then the possibility exists that the vibration which is measured at the motor is greatly influenced by a base which itself is vibrating. Ideally the base should be stiff enough to meet the “Massive Foundation” criteria defined by API 541 . Essentially, this requires that support vibration near the motor feet to be less than 30% of the vibration measured at the motor bearing. To test for a weak base, measure and plot horizontal vibration at ground level, at bottom, middle, and top of the base, and at the motor bearing. Plotted, this information would look like Fig. 11, for a motor sitting on a weak base. In this particular example, had the motor been on a rigid base, the vibration at the bearing would have been closer to .25 mils rather than the measured 2.50 mils.

半只青蛙 发表于 2009-12-23 10:06

后脚振动较明显高于前脚
首先检查安装，是软脚还是螺栓、之后再怀疑刚性

cxljiayou 发表于 2010-4-22 12:41

看看频谱是不是一倍频、二倍频 、三倍频等都有，那地脚没有垫实基本能确定。

hjj73 发表于 2010-4-22 13:07

回复 楼主 gweice 的帖子

基础刚性差，把安装简图和频谱发来，这类问题好解决。下面没垫平。

motuo1200 发表于 2010-5-13 10:25

很有可能是基础松动，换个位置重新装置，检测一下，看有什么变化！

honeybay 发表于 2018-8-18 13:58

如果基础松动，肉眼应该可以看出来或者简单测试即可判断是否基础松动
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