A rotor retaining sleeve is mechanically necessary in the structure of high-speed SPM machines to prevent structural failure. However, the significant eddy current loss within metal sleeves leads to a reduction in electromagnetic efficiency and serious thermal and mechanical issues. Therefore, several techniques and methods have been proposed and developed to reduce such losses. In this paper, a helical retaining sleeve is proposed to reduce losses by cutting the flow path of the eddy currents. Using FEA, a comparison is made of the electromagnetic and mechanical performance of the proposed sleeve against a conventional sleeve having the same material and dimensions. It is concluded that the eddy current loss reduces significantly when the helical sleeve is used, whereas the mechanical stress is broadly unchanged in the central region of the rotor with only a small increase around the ends when compared with the conventional sleeve.

高速SPM机器的结构在机械上需要转子固定套，以防止结构故障。但是，金属套管内的涡流损耗很大，导致电磁效率降低，并严重影响热和机械问题。因此，已经提出并开发了几种技术和方法来减少这种损失。在本文中，提出了一种螺旋形的保持套筒，以通过减少涡流的流动路径来减少损耗。使用FEA，将提出的套筒的电磁和机械性能与具有相同材料和尺寸的常规套筒进行了比较。结论是：使用螺旋套管时，涡流损耗显着降低，