High-resolution measurement method for magnetostriction of electrical steel sheets using an open-type single sheet tester

Article type: Research Article

Authors: Matsubara, Ryo^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: One of the main cause of acoustic noise from iron core in electrical machines is magnetostriction. However, good reproducibility of magnetostriction measurement cannot be expected due to its ppm-order value. To measure the magnetostriction accurately, it is required to clarify principal factors affecting the measurement accuracy. In this paper, a high-resolution method of measuring magnetostriction by means of an open-type single sheet tester equipped with double laser Doppler vibrometers is investigated. It is revealed that the odd components of a magnetostriction waveform should be removed as noises because the reproducibility of odd harmonic components is low. To improve the reproducibility, the friction between a test specimen and a support plate installed under the specimen should be reduced. Furthermore, it is demonstrated that the developed measuring system can be also applied to magnetostriction measurement of Fe-based amorphous sheets.

Keywords: Magnetostriction, electrical steel sheet, Fe-based amorphous sheet, laser Doppler vibrometer, single sheet tester

DOI: 10.3233/JAE-191148

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 61, no. S1, pp. S115-S122, 2019