超磁致伸缩换能器涡流损耗及温升抑制研究

When giant magnetostrictive materials are used in transducers, ultrasonic processing with large amplitudes can be achieved. When a giant magnetostrictive transducer is in use, a high-frequency current is applied, and a relatively large eddy current loss is generated inside, causing a temperature rise in the internal system of the transducer and resulting in unnecessary energy loss. Therefore, optimizing the design of the interior of the transducer to reduce the eddy current loss inside can effectively improve energy utilization, reduce the temperature rise of the system, and improve the amplitude stability of the transducer. A theoretical model of the eddy current loss inside the giant magnetostrictive transducer has been established, and the influence of giant magnetostrictive materials and permanent magnet slices on the eddy current loss has been specifically analyzed. At the same time, with the help of ANSYS Workbench software, a finite element simulation analysis has been carried out on the eddy current loss generated during the operation of the giant magnetostrictive transducer and the overall temperature rise of the transducer caused by it, and the law of the eddy current loss inside the transducer has been obtained at the theoretical level. Finally, an optimization scheme for the permanent magnet slices of the giant magnetostrictive transducer has been proposed. The results show that the eddy current loss of the transducer after slice optimization is significantly reduced, and the temperature rise during operation is significantly suppressed.

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。