Fe-Ga磁特性测试装置改进与动态磁致伸缩实验

发布时间：2018-12-31 19:12

【摘要】：利用Fe-Ga磁特性测试装置进行动态磁致伸缩测量时,受激励线圈产生的磁场的影响,测试样品的应变通常偏大,本文对此做了分析并进行验证。通过分析Fe-Ga动态磁致伸缩测量过程,对原测试装置进行了改进。将样品的一端固定在极头上并调节激励磁场使其在样品饱和磁场附近,以消除机械振动对动态磁致伸缩测试产生的影响。采用多参数磁学测试系统和改进前后的Fe-Ga特性测试系统进行Fe-Ga静态和动态磁致伸缩特性测试实验。结果表明:采用改进的Fe-Ga磁特性测试装置可在低饱和场下精确测量动态应变。实验还测试了Fe-Ga在2.7kA/m偏置磁场作用下的动态磁致伸缩特性,结果表明:(1)偏置磁场作用下应变与磁场同频;(2)应变对磁场的滞后随磁场频率的增加而增大;(3)λ~H曲线为椭圆形且椭圆环的面积随频率的增大而增大。上述结果表明,本文提出的改进装置可有效消除振动产生的额外应变。
[Abstract]:When the dynamic magnetostriction measurement is carried out by using the Fe-Ga test device, the strain of the test sample is usually too large, which is influenced by the magnetic field produced by the exciting coil. This paper analyses and verifies this. By analyzing the process of Fe-Ga dynamic magnetostriction measurement, the original testing device is improved. One end of the sample is fixed on the pole and the excitation magnetic field is adjusted to close to the saturation magnetic field of the sample to eliminate the effect of mechanical vibration on the dynamic magnetostriction test. The static and dynamic magnetostrictive properties of Fe-Ga were tested by using the multi-parameter magnetic test system and the improved Fe-Ga characteristic test system. The results show that the dynamic strain can be accurately measured in low saturation field by using the improved Fe-Ga device. The dynamic magnetostriction characteristics of Fe-Ga under the action of 2.7kA/m bias magnetic field are also tested. The results show that: (1) the strain and magnetic field are the same frequency under the bias magnetic field; (2) the hysteresis of the strain to the magnetic field increases with the increase of the frequency of the magnetic field, (3) the 位 ~ H curve is elliptical and the area of the elliptic loop increases with the increase of the frequency. The above results show that the improved device proposed in this paper can effectively eliminate the additional strain caused by vibration.
【作者单位】：河北工业大学电磁场与电器可靠性省部共建重点实验室;
【基金】：国家自然科学基金资助项目(No.51171057) 河北省自然科学基金资助项目(No.E2017202035)
【分类号】：TG115.27

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