Finite element analysis and experimental verifications of low-speed rotor torque of magnetic-geared motor with permanent magnets only in stator

Issue title: Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering

Guest editors: P. Di Barba, Roberto Galdi, M.E. Mognaschi and S. Wiak

Article type: Review Article

Authors: Okamoto, Junka^{a; b;} | Niguchi, Noboru^a | Hirata, Katsuhiro^a

Affiliations: [a] Osaka University, Japan | [b] Mitsubishi Electric Corporation, Japan

Correspondence: [*] Corresponding author: Junka Okamoto, Osaka University, Japan. E-mail: junka.o@mapse.eng.osaka-u.ac.jp. ORCID: https://orcid.org/0009-0008-5213-8577

Abstract: We propose a magnetic-geared motor with controllable step-out torque. The operational principle which controls the step-out torque using DC currents is described. The controllable step-out torque characteristics are computed using finite element method. In addition, the load characteristics under vector control are also computed using finite element method. Two inherent characteristics are observed in this analysis result. One is that this magnetic-geared motor can generate the torque more than the step-out torque. The other is that the phase angle difference between the rotors when both rotors step out is around 30 deg. In this paper, the mechanism of these inherent characteristics is investigated by finite element method, and these inherent characteristics are verified by carrying out measurements on a prototype.

Keywords: Magnetic-geared motor, controllable step-out torque, phase angle difference

DOI: 10.3233/JAE-230240

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 76, no. 1-2, pp. 91-100, 2024