A study on a vertical transport system consisting of coreless linear synchronous drive and magnetic suspension with novel arrangement of permanent magnets

研究人员提出了无铁心直线同步电机磁悬浮垂直运输系统的新概念。他在第一财年计算和比较了由Halbach永磁体阵列组成的动子垂直直线同步电机的不同备选设计的特点。他选择了一种具有良好特性和易于建造结构的设计，例如，从备选设计中选择合适的磁铁形式和必要的永磁体数量。搭建试验台后，他设计了悬浮控制器，并对磁悬浮系统进行了测试。他还介绍了基于观测器的悬浮控制，并与经典控制方案进行了比较，验证了其优越性。然而，Halbach阵列也存在内应力较大的技术问题，导致其机械支架的选择困难。另外，无铁心电枢侧存在严重的电磁发射问题，不利于传感器及其控制系统的信号传输。他应用共模滤波技术来抑制这个EMI问题，但这一努力并不完全成功。解决这一问题的具体策略是：(1)采用噪声排放更小的直线同步传动电源，(2)重新设计具有更高电磁抗扰度的布线结构，并研究了适用于垂直导数的位置检测方法，并利用双采样率数字观测器简化了位置检测。虽然他已经放弃了横向驱动的实验验证，但通过仿真结果验证了纵向和横向驱动概念的有效性。

The researcher has proposed the new concept of magnetically suspended vertical transport system with a coreless linear synchronous motor. He calculated and compared characteristics of different alternative designs of vertical linear synchronous motors with mover consisting of Halbach permanent magnet array in the first fiscal year. He selected a design of good characteristics as well as easy-to build structure, e.g., appropriate magnet forms and amount of necessary permanent magnet from the alternative designs. After building a test bench, he designed the levitation controller and tested the magnetic levitation system. He also introduced observer-based levitation control and verified its advantageous feature in comparison with classical control schemes. There were, however, also technical problems of relatively strong internal stress in the Halbach array, which results in the difficulty in selection of its mechanical support. Also the coreless armature side had problems of serious electromagnetic emission, which was harmful for sensors and signal transmission of its control system. He applied common-mode filter technique to suppress this EMI-problem, but this effort was not completely successful. The substantial strategies to this problem is :(1)application of power source of the linear synchronous drive with less noise emission, and (2)redesign of cabling configuration with more electromagnetic immunity.He investigated also position detection method suitable for the vertical derive, and simplified position sensing using a dual sample-rate digital observer. Although he has given up the experimental verification of lateral drive, the validity of the drive concept in both vertical and lateral directions has been verified through simulation results.