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中小型水轮发电机组运行中引起动不平衡力有多种原因,如转动件质心与轴线不相重合;安装时转子气隙偏差太大,盘车和调摆不合格;运行中磁极线圈局部短路产生不均匀磁拉力等等。当发现机组有强振时,首先要分析并判定引起振动的原因。属可补救和重新调整的,则必须及时纠正;若动不平衡是因机组本身偏心造成,则应进行机组动平衡予以消除。 机组发生强振,其危害极大。它将导致轴承油膜破坏,瓦温升高甚至烧瓦;又可造成噪声,使设备和厂房遭受损坏。因此,机组安装验收标准规定,对于额定转速小于250转/分的机组,其水平振动值应小于0.06～0.12毫米。
There are many reasons for the unbalanced force caused by the running of small and medium-sized hydro-generating units. For example, the center of mass of the rotating part does not coincide with the axis; when the rotor is installed, the deviation of the air-gap is too large and the turning and turning are unqualified; Short circuit produces uneven magnetic pull and so on. When the unit is found to have strong vibration, we must first analyze and determine the cause of vibration. It is remedial and readjustable, it must be promptly corrected; if the dynamic imbalance is caused by the unit itself eccentric, should be carried out to eliminate the dynamic balance of the unit. Strong vibration occurred unit, its great harm. It will cause the bearing oil film damage, the tile temperature rise or even burning tile; But also can cause the noise, causes the equipment and the factory house to suffer the damage. Therefore, the unit acceptance criteria for installation, the rated speed of less than 250 rev / min of the unit, the horizontal vibration value should be less than 0.06 ~ 0.12 mm.