摘要
高速电主轴的动态特性受轴承和高频谐波电磁力矩的共同影响,为了将两者的特征频率分离以便采取相应的控制方法,从气隙磁场的波形出发,利用傅里叶变换求出各次谐波磁动势,进而导出稳态谐波电磁转矩和脉动谐波电磁转矩的计算公式,得出稳态谐波转矩只影响主轴的转矩输出能力,脉动谐波转矩会导致系统产生周期性振动,且脉动频率为6的整数倍基波频率的结论。据此不仅可轻易分辨出由轴承运动和谐波电磁转矩所产生的振动频率及各自对系统动态性能的影响程度,而且可以根据系统的动态需求,采取有选择性的控制方法。最后以170MD15Y20型高速电主轴为例,对此结论进行了验证。
The dynamic performance of high speed motorized spindle was governed by both bearing and highfrequency harmonic torque. Aiming at extracting their characteristic frequencies for proper control, the calculationformulae for steady and ripple harmonic electromagnetic torque were derived from different electromagnetic force onthe basis of Fourier Transform of the waveform of the air gap magnetic field. The conclusion was that the steadyharmonic torque only affected the output torque of the spindle when the ripple harmonic torque generated periodicalvibration with frequency of integer multiple of six times fundamental frequency. Based on the above-mentionedresults, it is easy to extinguish the vibration frequency from the bearing and that from the harmonic torque, as wellas their effect on the dynamic performance of the spindle system. In addition, the different control methods can beapplied as the system dynamic requirement. Finally, the conclusion has been validated via an experiment on a170MD15Y20 high speed motorized spindle.
出处
《机械科学与技术》
CSCD
北大核心
2017年第5期729-735,共7页
Mechanical Science and Technology for Aerospace Engineering
基金
湖南省教育厅基金项目(12B042
15A063)
湖南省自然科学基金项目(2017JJ2090)资助
关键词
高速电主轴
谐波
电磁力矩
振动
high-speed motorized spindle
harmonic
electromagnetic torque
vibration
