Abstract This paper presents design and comparative study of high torque coaxial permanent magnet couplings (CPMC) for the use in a tidal current generation (TCG) system. Two different models such as a radial flux-CPMC (RF-CPMC) with magnet retaining rings and a flux concentrating-CPMC (FC-CPMC) with inner and outer rotor yoke changed by retaining rings are analyzed to find the best model under certain design constraint conditions to achieve a minimum pull-out torque of 1.0 kNm. Moreover, the effect of the electromechanical characteristics such as the radial force, stress and deformation are analyzed for both models. Based on the analysis it is found that both RF-CPMC and FC-CPMC are capable of producing the pull-out torque higher than 1.0 kNm, however considering the installation environment and the magnet use, RF-CPMC is selected for prototyping, which is tested using a 3 MW induction motor based dynamometer system to compare its torque production capability with respect to the simulated model. The comparison shows that the prototype is capable of producing the required amount of pull-out torque.

中文翻译：

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潮流发电机大扭矩同轴永磁联轴器的设计与对比研究

摘要 本文介绍了用于潮汐流发电 (TCG) 系统的高扭矩同轴永磁联轴器 (CPMC) 的设计和比较研究。分析了两种不同的模型，例如带有磁体挡圈的径向磁通 CPMC (RF-CPMC) 和带有挡圈改变内外转子轭的磁通集中 CPMC (FC-CPMC)，以找到特定设计下的最佳模型实现最小拉出扭矩为 1.0 kNm 的约束条件。此外，还分析了两种模型的机电特性（如径向力、应力和变形）的影响。根据分析发现，RF-CPMC 和 FC-CPMC 都能够产生高于 1.0 kNm 的拔出扭矩，但考虑到安装环境和磁铁的使用，原型设计选择了 RF-CPMC，使用基于 3 MW 感应电机的测功机系统对其进行测试，以将其扭矩产生能力与模拟模型进行比较。比较表明原型能够产生所需的拉出扭矩量。