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Phase Correction for High Precision Measurement of Iron Loss Using H‐coil Method
Author(s) -
Kutsukake Akifumi,
Kido Yukihito,
Ikeda Tetsu,
Kanada Tsugunori,
Enokizono Masato
Publication year - 2015
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.22449
Subject(s) - electromagnetic coil , materials science , phase (matter) , magnetic field , voltage , calibration , calibration curve , nuclear magnetic resonance , acoustics , electrical engineering , physics , engineering , chemistry , chromatography , quantum mechanics , detection limit
SUMMARY The accurate magnetic properties of electrical steel sheets are important for the development of high‐efficiency electromagnetic devices. In particular, the H‐coil method is a useful technique for accurately measuring magnetic field strength in a single sheet tester. Therefore, we developed a tester for magnetic field properties using the H‐coil method, referred to as the stress load type single sheet tester (S‐SST), and a problem was found in iron loss measurement at a high flux density of 1.6 T or more. In this paper, it is shown that the cause of this problem is the phase difference between the induced voltage in the H‐coil and the B‐coil. Because the phase difference makes the B–H loop slightly twisted near the tip point, the iron losses are evaluated low. Thus, we propose a method of determining the phase correction values. These values are measured in the absence of a specimen in the S‐SST measurement system, and the phase correction method for induced voltage in a coil is investigated. Finally, ideal results for the correction of iron loss in nonoriented electrical steel sheets are shown. The proposed method is effective for the calibration of a single sheet tester using the H‐coil method.