稀土超磁致伸缩换能器磁路设计与仿真

摘要

The main role of rare earth giant magnetoresistive transducer is electrically-magnetic-machine three kinds of energy conversion,namely under the alternating excitation curren in the coil the magnetic field is produced,making the rare earth giant magnetoresistive telescopic rod,which located in the magnetic field and the bias magnetic field,produces telescopic movement, output mechanical power and displacement in the superimposed magnetic field,in the process the magnetic energy played a pivotal role.It designed a straight moving type bi-directional output transducer based on a kind of giant magnetostrictive material which can be used in ultrasonic extrusion processing field. And the magnetic circuit of the device were simulation and optimization by the finite element analysis software ANSYS. The results showed that:the closed magnetic circuit system supplemented with bias magnetic field in favor of regional magnetic field intensity distribution of rare earth giant magnetostrictive rod, to solve the frequency doubling phenomenon. Also obtained the optimal drive current density of rare earth giant magnetostrictive transducer,which is important for the transducer design and optimization of the magnetic circuit.%稀土超磁致换能器的主要作用是实现电—磁—机三种能量的转化,即交变电流作用下在线圈中激发磁场,使位于偏置磁场和线圈激发磁场中的稀土超磁致伸缩棒,在叠加磁场的激励下产生伸缩运动,输出机械力和位移,该过程中磁能起到了举足轻重的重要作用.基于稀土超磁致材料设计了一种可以应用于超声挤压强化加工领域的直动型双向输出换能器,并采用了有限元软件ANSYS对其进行了磁路的优化和仿真.结果表明:闭磁路系统辅以偏置磁场有利于稀土超磁致棒区域磁场强度的均匀分布,解决倍频现象,同时也得出了稀土超磁致换能器的最佳电流驱动密度,这对换能器的结构设计和磁路优化具有重要意义.