考虑漏磁因素的盘式永磁涡流联轴器传动特性分析

Analyzing Transmission Characteristics of Disc Type Permanent Magnet Eddy Current Coupling with Magnetic Flux Leakage Considered

针对流体机械传统节流调节易造成大量电能浪费的问题,设计了一种具有传递动力和调速功能的盘式永磁涡流联轴器。建立了永磁涡流联轴器的等效磁路,构建了永磁涡流联轴器传递转矩和涡流损耗的计算模型,分析了漏磁因素对磁感应强度的影响,进一步探讨了转差、气隙大小、永磁体厚度等因素对传动特性的影响。结果表明:考虑漏磁后,气隙磁场的磁感应强度计算结果小于忽略该因素的结果,且两者之间的偏差随着气隙大小的增加而增加;永磁涡流联轴器传动转矩随着转差的增加先快速增加,然后缓慢下降,随着永磁体厚度的增加而增加,随着气隙大小的增加而减小。研究结果对盘式永磁涡流联轴器的设计具有指导意义。

To solve the problem that the traditional throttling regulation of fluid machinery is easy to waste a lot of electric energy, a disc type permanent magnet eddy current coupling with the function of power transmission and speed regulation is designed. The equivalent magnetic circuit of the coupling is established, the calculation model of torque and eddy current loss of the coupling is constructed, the influence of magnetic flux leakage on magnetic induction is analyzed. Furthermore, the influence of slip, air gap and thickness of permanent magnet on transmission characteristics is discussed. The results show that, after considering magnetic flux leakage, the calculation result on the magnetic induction intensity of air gap magnetic field is smaller than that of neglecting this factor and that the deviation between them increases with the increase of air gap. With the increase of slip, the transmission torque of the coupling first increases rapidly and then decreases slowly. The transmission torque increases with the increase of permanent magnet thickness and decreases with the increase of air gap size, thus guiding the design of disc permanent magnet eddy current coupling.