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Structured magnetic circuit for magnetorheological damper made by selective laser melting technology

机译：通过选择性激光熔化技术制造的磁流变阻尼器的结构化磁路

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摘要

Eddy currents are the main reason causing for the long response time of a magnetorheological (MR) damper. Eddy currents are often unwanted parasitic phenomenon for many electromagnetic machines working with an alternating magnetic field. Their reduction can be secured by the use of material with high electrical resistivity such as ferrites or soft magnetic composites. These materials, however, exhibit bad mechanical properties and cannot be used in mechanically loaded parts. Eddy currents can also be reduced by the appropriate structure which must secure high conductivity for the magnetic flux but low electrical conductivity for the electric current flowing perpendicularly to the magnetic flux. This leads to complex structures which, in most cases, cannot be manufactured by conventional methods. This paper describes the design, manufacturing and verification of simulations of the magnetic circuit for a MR damper. Structured magnetic cores printed by selective laser melting technology connects the benefits of low-carbon steel (good mechanical properties, high magnetic saturation and high relative permeability) with benefits of sintered materials (high electric resistivity). The results proved that using the potential of additive manufacturing can not only reduce the eddy currents (and thus shorten the response time and reduce losses), but significantly reduce the weight as well. This technology enables the combination of performance parameters of electromagnetic machines, which cannot be reached by any other existing method.
机译：涡流是导致磁流变（MR）阻尼器的长响应时间的主要原因。涡流通常是不需要的寄生现象，用于许多使用交替磁场的电磁机。它们的还原可以通过使用具有高电阻率的材料等材料来固定，例如铁氧体或软磁性复合材料。然而，这些材料表现出不良的机械性能，不能用于机械装载的部件。涡流也可以通过适当的结构来减小，该结构必须确保磁通量的高导电性，但是对于垂直于磁通量流动的电流的低电导率。这导致复杂的结构，在大多数情况下，不能通过常规方法制造。本文介绍了MR阻尼器磁路模拟的设计，制造和验证。通过选择性激光熔化技术印刷的结构化磁芯通过烧结材料（高电阻率）的益处连接低碳钢（良好的机械性能，高磁饱和度和高相对渗透率）的益处。结果证明，使用添加剂制造的潜力不仅可以减少涡流（因此缩短响应时间并减少损失），而且显着降低了重量。该技术使电磁机的性能参数的组合能够通过任何其他现有方法到达。

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