Method of Digital Waveform Control for Measuring Magnetic Properties by Means of a Single Sheet Tester
Method of Digital Waveform Control for Measuring Magnetic Properties by Means of a Single Sheet Tester
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单片测试仪测量磁性能的数字波形控制方法
DOI：
10.1541/ieejfms1990.119.7_1019
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发表时间：
1999
影响因子：
--
通讯作者：
N. Takahashi
中科院分区：
文献类型：
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作者：
T. Nakase;M. Nakano;K. Fujiwara;N. Takahashi
通过单片测试仪测量磁性能的数字波形控制方法 Tomoya Nakase（学生会员）、Masanori Nakano（会员）、Koji Fujiwara（会员）和 Norio Takahashi（会员）（冈山大学） 与模拟技术相比，数字反馈技术具有波形再现性好的优点，因为没有人为错误，并且控制过程中没有振荡。然而，它可能需要多次反馈迭代，特别是在较高的磁通密度下，因为应该生成相当扭曲的电压波形以保持样本的磁通波形为正弦波。本文提出了一种通过单片测试仪测量磁性能的鲁棒波形控制方法。利用测量系统的等效电路来估计由D/A转换器产生的初始电压波形，并且在估计初始电压波形之后应用调整最大磁通密度的有效技术。还讨论了空气通量补偿和磁轭结构对测量精度的影响。结果表明，即使在接近 2T 的高磁通密度下，波形控制也可以在几次反馈迭代内收敛。
Method of Digital Waveform Control for Measuring Magnetic Properties by Means of a Single Sheet Tester Tomoya Nakase, Student Member, Masanori Nakano, Member, Koji Fujiwara, Member and Norio Takahashi, Member (Okayama University) Digital feedback technique has advantages of good reproducibility of waveform due to no human error and of no oscillation in control process compared with analog technique. However, it may require many iterations of feedback, especially at higher flux densities, because a considerably distorted voltage waveform should be generated to keep the flux waveform of specimen sinusoidal. In this paper, a robust method of waveform control for measuring magnetic properties by means of a single sheet tester is proposed. An initial voltage waveform generated by a D/A converter is estimated by using the equivalent circuit of measuring system, and an efficient echnique for adjusting the maximum flux density is applied after the estimation of initial voltage waveform. The effects of air flux compensation and yoke construction on the measurement accuracy are also discussed. It is demonstrated that the waveform control can be converged within a few feedback iterations even at high flux density of nearly 2T.