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从磁致伸缩效应的基本原理出发,研究磁致伸缩换能效率与偏置磁场的对应关系,得到了换能效率的评价方法和用于评价永久磁铁及直流磁化线圈磁化效果的等效方法.该方法由永久磁化器和直流线圈同时提供方向相反的偏置磁场,通过调节线圈的电流,得到磁致伸缩换能效率与电流之间的关系;再利用换能效率仅与偏置磁场的大小有关而与偏置磁场的方向无关的对称特性,确定叠加偏置磁场的平衡点即叠加磁场强度为零的点,从而得到永久磁化器和直流线圈的等效关系.最后通过实验对等效关系进行了验证.
Based on the basic principle of magnetostrictive effect, the corresponding relationship between the magnetostrictive efficiency and the bias magnetic field is studied. The evaluation method of the transduction efficiency and the equivalent method for evaluating the magnetization of the permanent magnet and the dc magnetizing coil are obtained. In the method, the permanent magnetizer and the direct current coil provide the biasing magnetic field with the opposite direction at the same time, and the relationship between the magnetostrictive efficiency and the current is obtained by adjusting the current of the coil. Reuse of the conversion efficiency is only related to the magnitude of the bias magnetic field The relation between the permanent magnetisers and the DC coils is obtained by the symmetry characteristics independent of the direction of the bias magnetic field and the equilibrium point of the superimposed bias magnetic field, ie, the point at which the magnetic field strength is zero, is obtained. Finally, Verified.