Liu Pengfei, Kong Mengmeng, Diao Weidong, Feng Zhihua
Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, HeFei 230026, China.
Rev Sci Instrum. 2021 May 1;92(5):055004. doi: 10.1063/5.0044522.
The high-frequency eddy current loss limits the output speed of the giant magnetostrictive actuator (GMA). This paper investigates a GMA using a laminated silicon steel core. Compared with the integral silicon steel core, the laminated silicon steel core can reduce the equivalent conductivity and eddy currents. The laminated structure reduces the magnetic reluctance of the core and increases the magnetic field intensity in the giant magnetostrictive material rod. Therefore, the actuator can output large vibration amplitude under high-frequency magnetic field. At the sinusoidal excitation current of 35 A (rms) @ 2 kHz, the output vibration amplitude of the actuator using the laminated silicon steel core is 11.1 µm @ 4 kHz, which is 44.2% higher than that of the actuator with the integral silicon steel core. This indicates that the laminated structure of the magnetic core is beneficial to improve the output speed of GMA.
高频涡流损耗限制了超磁致伸缩驱动器（GMA）的输出速度。本文研究了一种采用叠片硅钢芯的GMA。与整体硅钢芯相比，叠片硅钢芯可以降低等效电导率和涡流。叠片结构降低了磁芯的磁阻，并增加了超磁致伸缩材料棒中的磁场强度。因此，该驱动器在高频磁场下能够输出较大的振动幅度。在2 kHz的35 A（均方根值）正弦激励电流下，采用叠片硅钢芯的驱动器在4 kHz时的输出振动幅度为11.1 µm，比采用整体硅钢芯的驱动器高出44.2%。这表明磁芯的叠片结构有利于提高GMA的输出速度。
