Abstract: Based on the magnetic circuit analysis of the traditional single-layer disc permanent magnet eddy current coupling, an integral double-layer disc permanent magnet eddy current coupling was designed. The coupling installed the permanent magnets of two single-layer disc permanent magnet eddy current couplings on the front and back of a piece of back iron in a N-S corresponding manner, thus, reducing the loss caused by the back iron reluctance in the magnetic circuit, improving the magnetic energy utilization rate of the permanent magnet and increasing the torque. Through the equivalent magnetic circuit method, a mathematical model of the structure was established, and combined with the finite element method simulation model, the torque characteristics were comprehensively analyzed. A prototype of the permanent magnet eddy current coupling was built, and the reliability of the above analysis was verified through experiments. The results show that the mathematical model built is accurate; and the torque of the coupling is greatly improved compared to the torque of the traditional permanent magnet eddy current coupling.

Key words: eddy-current coupling, double-layer permanent magnet, equivalent magnetic circuit, simulation analysis, experimental verification, torque performance

摘要： 基于对传统单层盘式永磁体涡流联轴器的磁路分析，设计了一种整体双层盘式永磁体涡流联轴器。该联轴器将两个单层盘式永磁涡流联轴器的永磁体以N-S对应的方式安装到一块背铁的正反面上，减小了背铁磁阻在磁路中带来的损耗,提高了永磁体的磁能利用率，增大了转矩。通过等效磁路法建立该结构的数学模型，并与有限元法仿真模型相结合，综合分析了其转矩特性。搭建了该永磁涡流联轴器的样机，通过实验验证了上述分析的可靠性。结果表明：所建数学模型准确，并且该联轴器的转矩相对于传统永磁涡流联轴器转矩有较大提高。

关键词: 涡流联轴器, 双层永磁体, 等效磁路, 仿真分析, 实验验证, 转矩性能