盘式涡流永磁耦合器磁场分析

Magnetic Field Analysis for Disc and Eddy Current Type of Permanent Magnet Couplers

永磁耦合器气隙磁场大小及分布对其性能影响较大,为了深入研究磁场情况,通过磁路法计算磁势及各部分磁阻,推导静态气隙磁感应强度。在永磁耦合器工作时会产生感应涡流磁场,总磁场为磁体磁场和涡流磁场的叠加,分析运动产生的感应涡流电密度以及叠加磁场在气隙部分的有效磁通。运用Ansoft有限元软件,通过三维瞬态仿真得到静态及一定工况下的涡流电密度、气隙磁感应强度。通过磁场分析了解磁路结构,可为进一步的磁路优化设计、减小漏磁、提高磁能利用率的研究提供一定参考。

The value and distribution of the magnetic field intensity in the air gap have a great influence on the performance of permanent-magnetic couplers,in order to further study the magnetic field,we calculated magnetic potential and reluctance of all parts and deduced the static magnetic induction intensity of the air gap. The permanent-magnetic couplers generates additional magnetic field due to induced eddy-current in working,and the total magnetic intensity is the magnetic field of the magnets with the addition of eddy magnetism,and we analyzed the induced eddy-current density due to motion and useful flux in the gap. Using Ansoft software,we obtained eddy-current density and magnetic induction intensity of the gap in static and under certain condition through three dimensionaltransient simulations. By analyzing magnetic field,we understood the magnetic circuit structure,which provides a reference for optimal design of magnetic circuit,reducing the magnetic flux leakage and improving the utilization of magnetic energy.