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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。
In order to reduce the effect of beat-vibration on the machining precision of the high-speed precision grinding machine spindle, the flapping vibration in the spindle was observed and measured by using the sensor of the magnetic suspension bearing and the digital signal processing components without any additional equipment. The characteristics of vibration signal are extracted by time domain, frequency domain analysis and wavelet transform. The analysis shows that the vibration is caused by mechanical unbalance of rotor and dynamic eccentricity of rotor. Based on the analysis of the vibration mechanism of the magnetic spindle bearings, the active control of the magnetic suspension bearing system is used to adjust the dynamic characteristics of the spindle, and to suppress the beat-hunting phenomenon in a targeted manner, which can effectively improve the stability of the magnetic spindle system of high- Precision.