磁悬浮轴承磨床电主轴中拍振现象的分析

为减小拍振现象对高速精密磨床电主轴加工精度的影响,利用磁悬浮轴承自身的传感器及数字信号处理部件,在不外加其他设备的情况下对电主轴中的拍振进行了观察实测。通过时域、频域分析以及小波变换,提取振动信号的特征,经分析发现拍振现象是由转子机械不平衡以及转子动态偏心共同引起的。在磁悬浮轴承电主轴拍振机理的分析基础上,通过磁悬浮轴承系统的主动控制调节主轴动态特性,有针对性地对拍振现象进行抑制,可以有效改善高速精密磨床磁悬浮电主轴系统的稳定性和精密度。

Analysis of beat vibration phenomenon in the AMB spindle

In order to reduce the effect of the beat vibration phenomenon on the machining accuracy of the high-speed precision grinder active magnetic bearing spindle,its own sensor and digital signal processing components of the magnetic bearing were used to observe and measure the beat vibration without other equipment being attached.Time domain analysis,frequency domain analysis and wavelet transform were applied to extract the characteristics of the vibration signal.The analysis showed that the beat vibration phenomenon was caused by rotor mechanical imbalance and the rotor dynamic eccentricity.Based on the mechanism analysis of the beat vibration in the magnetic bearing electric spindle,the active control could be used to adjust the spindle dynamic characteristics,and therefore to realize the suppression of beat vibration phenomenon,the stability and precision of the magnetic levitation high-speed precision grinder spindle system could be effectively improved.