紀要論文

エプスタイン試験器による磁気特性測定装置の開発 : 単板磁気試験器との性能比較

DEVELOPMENT OF MAGNETIC PROPERTY MEASUREMENT EQUIPMENT USING EPSTEIN FRAME : PERFORMANCE COMPARISON WITH SINGLE SHEET TESTER

jpn

24368083

https://doi.org/10.15002/00025322

法政大学大学院理工学研究科

法政大学大学院紀要. 理工学研究科編

63

1

6

2022-03-24

Version of Record

ヘッダー部分に誤記 ; (誤) 法政大学大学院紀要理工学・工学研究科編 (正) 法政大学大学院紀要理工学研究科編

The Epstein frame is one of the very effective magnetic testers for measuring the magnetic properties of electromagnetic steel sheets used as the main iron core material of motors. There is no need to use yokes to measure magnetic properties with the Epstein tester. Therefore, it is possible to measure in the state of a single magnetic material. In addition, the method for measuring magnetism in the audible frequency range has been standardized by JIS. However, in Japan, single sheet tester, which are easy to automate, simple in structure, and inexpensive, are more commonly used. In this paper, we compared the measurement performance of Epstein frame with that of single sheet tester. The excitation current method was adopted as the calculation of the magnetic field in each magnetic tester. In addition, distortion of the magnetic flux density waveform occurs in the high magnetic flux density region. Therefore, in order to unify the measurement conditions, waveform control was performed so that the magnetic flux density waveform would be sinusoidal. In order to compare the performance of the magnetic measurements of the Epstein frame and single sheet tester at varying frequencies, the DC hysteresis characteristics were derived using the dual frequency method. As a result, it was confirmed that the measurement results of the Epstein frame were more consistent and less affected by the frequency change than those of the single sheet tester.

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