Influence of distortion factor of induced voltage in B-coil on magnetic property measured with a single sheet tester

Article type: Research Article

Authors: Shibataki, Takuya^a | Takahashi, Yasuhito^a; | Fujiwara, Koji^a

Affiliations: [a] Department of Electrical Engineering, Doshisha University, Kyoto, Japan

Correspondence: [*] Corresponding author: Yasuhito Takahashi, Department of Electrical Engineering, Doshisha University, Kyoto, 610-0321, Japan. E-mail: ytakahashi@mail.doshisha.ac.jp

Abstract: It is desirable that the waveform of induced voltage 𝜐b in the B-coil is substantially sinusoidal when magnetic properties of electrical steel sheets are measured. To realize a sinusoidal 𝜐b, the IEC standards specify that its form factor FF should be controlled within 1.11 ± 0.01. However, the condition is not sufficient because a non-sinusoidal waveform can also give FF = 1.11. Ideally, the distortion factor DF𝜐b of 𝜐b should be equal to 0. Therefore, this paper discusses the influence of the DF𝜐b on magnetic properties of electrical steel sheets measured with a single sheet tester. As a result, it is confirmed that the iron loss is directly proportional to the distortion factor of induced voltage in the B-coil. Therefore, the distortion factor should be specified relating accuracy of the iron loss measurements.

Keywords: Distortion factor, electrical steel sheet, magnetic properties, single sheet tester

DOI: 10.3233/JAE-190924

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 61, no. S1, pp. S39-S48, 2019