LINEAR CONVEYER SYSTEM USING SELF-SENSING ACTIVE MAGNETIC BEARINGS

(1)采用几何方法研究了自感知磁轴承的扰动消除问题。两种类型的干扰，静态负载和正弦干扰（转子不平衡）。结果表明，该系统在静态负载下实现了虚拟零功率运行，同时可以补偿周期性扰动。(2)为了降低成本，提出将自感知主动磁轴承应用于直线轴承系统。该系统的配置进行了演示。(3)由于实芯电磁铁的低成本优势，本文对实芯电磁铁自感知磁悬浮进行了理论和实验研究。(4)当使用实心铁芯时，在设计控制器时必须考虑铁芯中流动的涡电流的影响，因为它们导致磁体中的磁通量的相当大的时间滞后。引入了一个新的变量来代替线圈电流来表征实心磁轴承的动态特性。分析表明，新的状态变量的系统是可控的和可观的，即使只有线圈的电压和电流检测。这意味着，自检测悬浮方法中使用的叠层铁芯的电磁轴承可以应用。(5)建立了实芯电磁铁主动磁轴承自感知悬浮的实验装置。(6)观察到磁通量到线圈电流的大的时间滞后。(7)测量了设计控制器所需的参数。(8)测量结果表明，某些参数依赖于频率。这给实芯电磁铁磁悬浮轴承实现自感知悬浮带来了很大困难。

(1) Distubance cancellation for the self-sensing magnetic bearings was investigated by using the geometric approach. Two types of disturbances were treated, static load and sinusoidal disturbance (rotor unbalance) . It was shown that virtual zero power operation was achieved under static load while periodic disturbances could be compensated.(2) The application of self-sensing active magnetic bearing (AMBs) to linear carrier systerns was proposed for cost reduction. The configuration of the proposed system was demonstrated.(3) Since solid-cored electromagnets also lead to low-cost production, the self-sensing magnetic suspension in AMBs with solid-cored electromagnets was studied both theoretically and experimentally.(4) When solid cored are used, the effects of the eddy currents flowing in the cores must be taken into account in designing the controller because they cause a considerable time lag of the flux in the magnet. A new variable was introduced instead of the coil current to represent the dynamics of the AMB with solid cores. The analysis showed that the system with the new state variables was controllable and observable even if only the coil voltage and current were detected. This means that the self-sensing suspension method used in an AMB with laminated cores can be applied. (5) An experimental setup was built for studying the self-sensing suspension in the active magnetic bearings with solid-cored electromagnets.(6) A large time lag of the flux to the coil current was observed.(7) The parameters necessary for designing the controller were measured.(8) The measurements results showed that some of the parameters depended frequency. It lead to great difficulty in realizing self-sensing suspension in AMBs with solid-cored electromagnets.