Analysis of impulse-magnetization in rare-earth permanent magnets

Issue title: Special Issue on the 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering

Subtitle: Considering virgin magnetization curve and demagnetization resistance

Guest editors: Sławomir Wiak, Paolo Di Barba and Krzysztof Komeza

Article type: Research Article

Authors: Bavendiek, G.^{a; *} | Hameyer, K.^a | Filippini, M.^b | Alotto, P.^b

Affiliations: [a] Institute of Electrical Machines, RWTH Aachen University, Aachen, Germany | [b] Department of Industrial Engineering, University of Padova, Padova, Veneto, Italy

Correspondence: [*] Corresponding author: G. Bavendiek, Institute of Electrical Machines, RWTH Aachen University, Aachen, Germany. E-mail: [email protected].

Abstract: Permanent magnets need to be magnetized with a high magnetic field for retaining their maximum polarization. If the magnetizing field is not sufficiently high, the permanent magnet will not reach its maximum energy product. Additionally, the magnet easily suffers demagnetization because the remanence and coercive field will drop in highly non-linear characteristic. This paper presents an approach which models the local magnetization of permanent magnets during and after impulse magnetization. Common hysteresis models are not capable of modelling the impact of virgin magnetization on demagnetization behavior of permanent magnets. Therefore, measurements suit as interpolation basis for the finite element method.

Keywords: Pulse magnetization, permanent magnets, virgin magnetization, demagnetization curves

DOI: 10.3233/JAE-182301

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 57, no. S1, pp. 23-31, 2018