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

研究者提出了无铁心直线同步电动机磁悬浮垂直运输系统的新概念。在第一个财政年度，他计算并比较了具有Halbach永磁体阵列组成的动子的垂直直线同步电机的不同替代设计的特性。他选择了具有良好特性的设计以及易于建造的结构，例如，从替代设计中选择合适的磁体形式和所需永磁体的量。在搭建了试验台之后，他设计了悬浮控制器，并对磁悬浮系统进行了测试。他还介绍了基于磁悬浮控制，并通过与经典控制方案的比较，验证了其优越性。然而，在Halbach阵列中也存在相对强的内应力的技术问题，这导致难以选择其机械支撑。无铁心电枢侧电磁辐射严重，对传感器和控制系统的信号传输造成危害。他应用共模滤波器技术来抑制EMI问题，但这一努力并不完全成功。解决这一问题的实质性策略是：（1）采用低噪声的直线同步驱动电源，（2）重新设计具有更高电磁抗扰性的布线结构，并研究了适用于垂直方向的位置检测方法，采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，但通过模拟结果验证了垂直和横向方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.