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针对高频大电流驱动下超磁致伸缩执行器发热严重影响其有效位移输出精度的问题,采用管式冷却结构措施以抑制执行器温升.根据欧姆定律建立交流(DC)与直流(AC)电同时作用下执行器电阻损耗理论模型,基于麦克斯韦方程推导出磁致伸缩棒内部磁场方程及涡流损耗模型,从复数磁导率虚部出发得出磁致伸缩棒磁滞损耗模型.求解上述模型可知:当驱动频率达到50Hz时,磁致伸缩棒损耗占执行器总损耗5%.通过搭建执行器热特性测试实验台,实验测得执行器损耗与理论计算结果吻合良好;管式冷却具有较好的冷却效果,可将磁致伸缩棒温度控制在50℃以内,其实验结果与有限元仿真结果最大误差为3℃以内,进一步验证热损耗计算公式有效性并为精密超磁致伸缩执行器的设计和应用提供了理论支持.
Aiming at the problem that the heating of giant magnetostrictive actuator seriously affects the output displacement accuracy of displacement driven by high frequency and large current, tubular cooling structure is adopted to suppress the temperature rise of actuator.According to Ohm’s law, AC and DC are set up, Based on the Maxwell equation, the magnetic field equation and eddy current loss model of the magnetostrictive rod were deduced, and the hysteresis loss model of the magnetostrictive rod was derived from the imaginary part of the complex permeability. The above model It can be seen that when the driving frequency reaches 50Hz, the loss of magnetostrictive rod accounts for 5% of the total loss of the actuator.Through the construction of thermal test bench of the actuator, the experimentally measured actuator loss agrees well with the theoretical calculation results. Good cooling effect, the magnetostrictive rod temperature can be controlled within 50 ℃, the experimental results and finite element simulation results of the maximum error of less than 3 ℃, to further verify the heat loss calculation formula validity and precision Giant Magnetostrictive Actuator The design and application provide theoretical support.