The term imbalance refers to rotating bodies with a mass that is not rotationally symmetrical. In other words, the center of mass is not on the axis of rotation
术语:不平衡是指质量不旋转对称的旋转体。换句话说，质心不在旋转轴上
Fig.: Representative sketch of an imbalance
图: 不平衡的代表性示意图
Imbalance leads to vibrations and increased wear, particularly at high speeds, which is why counterweights are applied to compensate for this as counterbalance. In practice, it is very rarely possible to fully compensate for this, meaning every rotating body has some residual imbalance.
The centrifugal force caused by imbalance is dependent on the square speed and thus has a more significant effect at higher speeds (higher speed frequency). On a spectrum, therefore, the frequency line denoting speed is significantly higher.
不平衡会导致振动和增加磨损，特别是在高速情况下，这就是为什么使用配重来作为平衡来补偿的原因。在实际中，很少能完全补偿，这意味着每个旋转体都有一些残余的不平衡。
由不平衡引起的离心力取决于速度的平方，因此在更高的速度下有更大的影响（更高的速度频率）。因此，在频谱上，表示速度的频率线明显更高。
Failure mode 故障类型 |
Frequency in raw signal spectrum 原始信号频谱中的频率 |
Frequency in envelope spectrum 包络谱中的频率 |
Comment 解释 |
|---|---|---|---|
Imbalance 不平衡 |
1 x fn |
- |
Only severe imbalance causes peaks in the speed that show up in the envelope spectrum. 只有严重的不平衡才会导致出现在包络频谱中的速度的尖峰。 |
fn |
... Nominal speed ... 标称转速 |
Information: 注意: The module can only measure the intensity of the imbalance, not its position on the shaft. For this reason, it cannot be used for balancing. 该模块只能测量不平衡的强度，而不是它在轴上的位置。由于这个原因，它不能用于平衡整定。 |
Fig.: Failure causes and effects of imbalance
图: 不平衡的故障原因和影响
For the meaning of individual characteristic values, see Characteristic values and Configuration.
各个特征值的含义，见 Characteristic values 和 Configuration.