摘要
电磁振动是电磁直驱型机床电主轴不可回避的振动来源,为了抑制电磁振动需要探讨其电磁力的频谱特征。推导了三相异步电主轴的电磁力波计算公式,重点分析了转子偏心状态下的电磁力波特点。基于Ansoft电磁场计算软件,建立了某国产电主轴的电磁场有限元分析模型,获得了电主轴的运行特性曲线。研究了转子在不偏心和偏心状态下的电磁力频谱变化规律,结果表明,静偏心会使电磁力力波成分更为丰富;偏心的增加不会影响电磁力的阶次和频率分布,但与不平衡磁拉力的幅值和低阶力波幅值成正相关关系,将加剧电主轴的振动。
Electromagnetic vibration is an inevi- table vibration source for an electric spindle therefore, it is necessary to study the frequency spectrum of electromagnetic force in order to sup- press electromagnetic vibration. The calculation formula about electromagnetic force of three - phase asynchronous electric spindle was derived and the characteristics of electromagnetic force with rotor eccentricity was analyzed. An electro- magnetic field finite element analysis model was built for a domestically produced electric spindlers based on Ansoft software, and a main performance curve of electric spindle was obtained. The variation of electromagnetic force^s frequency spectrum with eccentricity and without eccentricity was re- searched and the results show that the electric spindle with eccentricity produces additional com- ponents of electromagnetic force. Increased eccen- tricity does not influence the order or frequency distribution of the electromagnetic forcebut the in- crease of eccentricity positively relates to the am- plitude of electromagnetic force and low - order force. For this reason, the vibration of electric spindle will be exacerbated.
出处
《机械与电子》
2015年第8期33-37,共5页
Machinery & Electronics
基金
国家重大专项(2012ZX04001-012-04)
关键词
机床电主轴
电磁力
转子偏心
有限元分析
频谱分析
machine tool spindle
electromag-netic force
rotor eccentricity
finite element analysis
frequency spectrum analysis
