単板磁気試験器を用いたディジタル磁気特性測定システムにおける波形制御法

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  • Method of Digital Waveform Control for Measuring Magnetic Properties by Means of a Single Sheet Tester
  • タンパン ジキ シケンキ オ モチイタ ディジタル ジキ トクセイ ソクテイ システム ニ オケル ハケイ セイギョホウ

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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 technique 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.

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