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Journal of Tsinghua University(Science and Technology)    2019, Vol. 59 Issue (8) : 683-688     DOI: 10.16511/j.cnki.qhdxxb.2018.25.059
MECHANICAL ENGINEERING |
Suppression of imbalance vibrations in magnetically suspended spindles based on zero-bias current control
RONG Hai, ZHOU Kai, MAO Feilong
Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
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Abstract  Biased current control consumes large amounts of power which increases system temperatures and causes temperature drift in sensors which then affects the levitation accuracy. The rotor suspension is also affected by unbalanced forces, sensor runout and other effects which lead to vibrations. This paper presents a zero-bias current strategy based on a multiple frequency notch filter. The zero-bias current control algorithm reduces the power consumption, handles the nonlinearities in the zero-bias current strategy, and translates the nonlinear relationship between the current and the displacement into a linear relationship between the magnetic force and the displacement so that a linear control strategy can be used. The multiple frequency notch filter then suppresses the vibrations. Three controllers are analyzed in tests with no unbalanced control, only single frequency notch filter control and multiple frequency notch filter control to verify the system effectiveness. The method not only suppresses the vibrations, but also significantly reduces the power consumption.
Keywords magnetically suspended spindle      zero-bias current      multiple frequencies notch filter      imbalance vibration suppression     
Issue Date: 05 August 2019
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RONG Hai
ZHOU Kai
MAO Feilong
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RONG Hai,ZHOU Kai,MAO Feilong. Suppression of imbalance vibrations in magnetically suspended spindles based on zero-bias current control[J]. Journal of Tsinghua University(Science and Technology), 2019, 59(8): 683-688.
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http://jst.tsinghuajournals.com/EN/10.16511/j.cnki.qhdxxb.2018.25.059     OR     http://jst.tsinghuajournals.com/EN/Y2019/V59/I8/683
  
  
  
  
  
  
  
  
  
  
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