Development of an axial-flux self-bearing motor using two permanent magnet attractive type passive magnetic bearings

Issue title: Selected papers from the International Symposium on Applied Electromagnetics and Mechanics - ISEM 2019

Guest editors: Jinhao Qiu, Ke Xiong and Hongli Ji

Article type: Research Article

Authors: Ueno, Satoshi^a; | Tomoda, Masaya^a | Jiang, Changan^a

Affiliations: [a] Department of Mechanical Engineering, College of Science and Engineering, Ritsumeikan University, Kusatsu, Shiga, Japan

Correspondence: [*] Corresponding author: Satoshi Ueno, Department of Mechanical Engineering, College of Science and Engineering, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga, 525-8577, Japan. E-mail: sueno@se.ritsumei.ac.jp

Abstract: This paper introduces an axial-flux self-bearing motor (ASBM) using two permanent magnet attractive type passive magnetic bearings (PMBs). The ASBM provides both functions of a disc motor and thrust magnetic bearing, and controls motor torque and axial force by single rotational magnetic flux. The PMB consists of a cylindrical permanent magnet and an iron shaft with conical edge, and it supports the rotor in radial directions. This motor has a simple structure and control system, and it is possible to reduce the size and cost. In this paper, the structure and control method are introduced, and the results of levitation and rotation tests whose non-contact rotation speed was achieved up to 1,500 rpm are shown.

Keywords: Magnetic bearing, axial-flux self-bearing motor, passive magnetic bearing

DOI: 10.3233/JAE-209395

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 64, no. 1-4, pp. 827-833, 2020