超磁致伸缩换能器涡流损耗及温升抑制研究

超磁致伸缩材料用于换能器后可实现大振幅的超声加工。超磁致伸缩换能器使用时会施加高频电流，内部会产生较大的涡流损耗，引起换能器内部系统的温升，造成不必要的能量损耗，因此对换能器内部进行优化设计，降低换能器内部的涡流损耗，可有效提高能量利用率，减小系统温升，提高换能器的振幅稳定性。建立了超磁致伸缩换能器内部涡流损耗的理论模型，特别分析了超磁致伸缩材料和永磁体切片对涡流损耗的影响。同时借助ANSYS Workbench软件对超磁致伸缩换能器工作时产生的涡流损耗及其引起的换能器整体的温升情况进行了有限元仿真分析，在理论层面得到了换能器内部的涡流损耗规律。最终提出了超磁致伸缩换能器的永磁体切片优化方案，结果表明，切片优化后的换能器涡流损耗明显降低，工作时温升情况得到明显抑制。

Eddy Current Loss and Thermal Control of Giant Magnetostrictive Transducer

Giant magnetostrictive material can realize large-amplitude ultrasonic processing when it is used in a transducer. When the giant magnetostrictive transducer is used, it will generated a large eddy current loss, which will cause the temperature rise of the internal system of the transducer, and cause the unnecessary power loss. Thus, optimizing the design of the interior of the transducer to reduce the eddy current loss inside the transducer can effectively improve the energy utilization rate, reduce the temperature rise of the system, and improve the amplitude stability of the transducer. The theoretical model of the eddy current loss inside the giant magnetostrictive transducer is established, and the influence of the giant magnetostrictive material and permanent magnet slices on the eddy current loss is especially analyzed. The finite element simulation analysis of the eddy current loss and the overall temperature rise of the transducer caused by the giant magnetostrictive transducer is carried out with the help of ANSYS Workbench, and the eddy current loss law inside the transducer is obtained at theoretical level. Finally, a permanent magnet slice optimization scheme for giant magnetostrictive transducer is proposed. The results show that the eddy current loss of the transducer after slice optimization is significantly reduced, and the temperature rise during operation was significantly suppressed.