Basic investigation of deterioration on magnetic properties of laminated iron core after welding process

Issue title: 14th International Workshop on 1&2 Dimensional Magnetic Measurement and Testing (2016)

Guest editors: Zhiguang Cheng, Jianguo Zhu, Yongjian Li and Johannes Sievert

Article type: Research Article

Authors: Kawaguchi, Kohei^a | Takahashi, Yasuhito^{a; *} | Fujiwara, Koji^a | Matsushita, Makoto^b | Takahashi, Norio^b | Tokumasu, Tadashi^b

Affiliations: [a] Doshisha University, Kyoto 610-0321, Japan | [b] Toshiba Corporation, Ltd., Tokyo 183-8511, Japan

Correspondence: [*] Corresponding author: Yasuhito Takahashi, Doshisha University, Kyoto 610-0321, Japan. Tel./Fax: +81 774 65 6266; E-mail: ytakahashi@mail.doshisha.ac.jp.

Abstract: In order to develop a highly efficient motor, it is important to understand the influence of manufacturing processes on the resulting magnetic properties of magnetic materials. The deterioration of magnetic properties of laminated cores due to the welding significantly depends on its process. Therefore, the deterioration of magnetic properties upon the welding process has to be evaluated so as to calculate the iron losses using numerical simulation accurately. First, the iron losses of a single punched steel sheet and stator cores in which some punched steel sheets are stacked and welded are measured. Next, differences of these results are compared to evaluate the influence of welding process. It is confirmed that the lager the number of welding parts is, the larger the deterioration of magnetic properties becomes. Finally, the validity of the measurements is discussed based on iron loss calculations using the finite element method (FEM).

Keywords: Stator core, punched steel sheet, welding, deterioration of magnetic properties

DOI: 10.3233/JAE-172271

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 55, no. S1, pp. 169-176, 2017