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[摘要]
磁悬浮轴承具有无摩擦、无磨损以及无需润滑等诸多优点,在鼓风机、压缩机和暖通领域有广阔的应用前景。针对65 kW、30 000 r/min热泵压缩机,基于最大承载力要求和电机转子轴径限制,设计了一款5自由度(5-DOF)主动磁悬浮轴承。针对压缩机成柜后出现的模态共振问题,通过增加安装机座支撑强度的方法抑制和消除了共振模态。该磁悬浮轴承成功应用于实际热泵压缩机,在全工况运行范围,磁悬浮轴承系统的灵敏度函数小于12 dB,转子振动峰-峰值最大值不超过80 μm,工作转速范围轴振峰-峰值小于20 μm,满足ISO 14839规定的长期稳定运行要求。
[Key word]
[Abstract]
Magnetic bearing has many advantages such as no friction, no wear and no lubrication. It has broad application prospects in the fields of blower, compressor and heating ventilation air conditioning (HVAC). For a 65 kW, 30 000 r/min heat pump compressor, a 5-degree-of-freedom (5-DOF) active magnetic bearing is designed based on the requirements of maximum load capacity and rotor diameter limitation. Aiming at the modal resonance problem of heat pump compressor after cabinet installation, the resonance mode is suppressed and eliminated by increasing the support strength of mounting frame. The magnetic bearing has been successfully applied to the practical heat pump compressor. In all operation conditions, the sensitivity function value of the magnetic bearing system is less than 12 dB, and the maximum peak-to-peak value of the rotor vibration is no more than 80 μm, especially it is less than 20 μm in the working speed range. It means that the heat pump compressor with the magnetic bearing can run stably for a long time, meeting the ISO 14839 requirements.
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