高频涡流损耗限制了磁致伸缩致动器的输出速度。该文提出了一种采用硅钢片导磁框的高速磁致伸缩致动器。与整块硅钢结构的导磁框相比, 分区绝缘的硅钢片可降低等效电导率, 减小导磁元件中的涡流。该设计提高了磁致伸缩棒中的磁场强度, 使致动器在高频磁场激励下也能输出较大振幅。在有效值为35 A@2 kHz的正弦波励磁电流下, 采用叠片结构导磁框的磁致伸缩致动器输出振幅11.1 μm@4 kHz的振动, 比采用整体结构导磁框的致动器输出速度提升了44.2%。这说明将磁路元件分区绝缘有利于提升磁致伸缩致动器的输出速度。

The high frequency eddy current loss limits the output speed of the magnetostrictive actuator. This paper presents a high speed magnetostrictive actuator with silicon steel sheet magnetic frame. Compared with the magnetic frame of the integral silicon steel structure, the partition insulated silicon steel sheet can reduce the equivalent conductivity and eddy current in the magnetic element. This design increases the magnetic field strength in the magnetostrictive rod, so that the actuator can output large amplitude under high frequency magnetic field. At the sinusoidal excitation current of 35 A(rms)@2 kHz, the output amplitude of the magnetostrictive actuator with laminated magnetic frame is 11.1 μm@4 kHz, which is 44.2% higher than that of the actuator with integral magnetic frame. This indicates that the partition insulation of the magnetic circuit element is beneficial to improve the output speed of the magnetostrictive actuator.