磁悬浮轴承系统的试验研究

Experimental research of magnetic bearings system

对数字控制五自由度磁轴承系统的结构、硬件电路的组成进行了研究,实现了数字控制五自由度磁轴承全悬浮.综合分析了磁轴承系统的特性,作为磨削电主轴的磁轴承,其静态轴向最大承载力为1 160 N,径向前后端磁轴承最大承载力分别为798 N和428 N,轴向最小静刚度为1 412 N/μm,径向为535 N/μm.所设计的磁轴承满足磨削电主轴的承载力要求,实测静刚度在承载能力范围内达到应用要求.转子位移数据及轨迹的记录反映了磁轴承的精度,冲击试验说明系统基本上具备了大范围一致稳定性.

The structure and hardware circuits of 5-degree-freedom magnetic bearing system controlled by digits were described. Experimental platform of magnetic bearing system was built to carry out experiments. The digit-controlled 5-degree-freedom MB was suspended. The characteristics of the magnetic bearing system were analyzed theoretically and practically. The maximum carrying force of magnetic bearing, on which the grinder-polisher electric spindle was supported, along static axial direction was 1 160 Nμ radial former and back end maximum carrying forces range from 798 N to 428 N. Axial minimum static stiffness equals to 1 412 N/μm, radial 535 N/μm. Each parameter achieves the specification. The accuracy of magnetic bearings was reflected by the tested rotor displacement and tracks. Strike test show the system possesses broad bound uniform stability.