Conductivity and AC magnetic loss of Nd–Fe–B sintered magnet

Article type: Research Article

Authors: Shutta, Yusaku^a | Ako, Yuya^a | Takahashi, Yasuhito^a; | Fujiwara, Koji^a | Kitao, Junji^b | Yamada, Masaki^b

Affiliations: [a] Department of Electrical Engineering, Doshisha University, Kyoto, Japan | [b] Mitsubishi Electric Corporation, Hyogo, Japan

Correspondence: [*] Corresponding author: Yasuhito Takahashi, Department of Electrical Engineering, Doshisha University, Kyoto, 610-0394, Japan. Tel.: +81 774 65 6266; Fax: +81 774 65 6266; E-mail: [email protected]

Abstract: This paper investigates the influences of the grade, the alignment direction and magnetization ratio of Nd–Fe–B sintered magnet on its conductivity and AC loss to achieve further high-efficiency of permanent magnet synchronous motors. As a result, it is confirmed that the difference in grade had little effect on the conductivity and AC loss. The difference in conductivity is not caused by the magnetization ratio. Furthermore, the influence of hysteresis loss and skin effect varies depending on the magnetization ratio.

Keywords: Nd–Fe–B sintered magnet, conductivity, anisotropy, AC magnetic loss, motor

DOI: 10.3233/JAE-190821

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 61, no. S1, pp. S3-S12, 2019