JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2012, Vol. 42 ›› Issue (3): 133-137.

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Analysis of beat vibration phenomenon in the AMB spindle

BIAN Bin1, LIU Shu-qin1, HE Si-yan2, LI De-guang1   

  1. 1. School of Electrical Engineering, Shandong University, Jinan 250061, China;
    2. Department of Automation Engineering, Shandong College of Electronic Techndogy, Jinan 250200, China
  • Received:2011-12-30 Online:2012-06-20 Published:2011-12-30

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Abstract:

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.

Key words: beat vibration, magnetic bearing, spindle, wavelet analysis, active control

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