A4 Conference proceedings

Linear Recoil Curve Demagnetization Models for Rare-Earth Magnets in Electrical Machines

Publication Details
Authors: Egorov Dmitry, Petrov Ilya, Link Joosep, Kankaanpää Harri, Stern Raivo, Pyrhönen Juha
Publication year: 2019
Language: English
Title of parent publication: 45th Annual Conference of the IEEE Industrial Electronics Society IECON 2019
Start page: 1157
End page: 1164
Number of pages: 8
ISBN: 978-1-7281-4879-3
eISBN: 978-1-7281-4878-6
ISSN: 1553-572X
eISSN: 2577-1647
JUFO-Level of this publication: 1
Open Access: Not an Open Access publication


Rare-earth-permanent-magnet excitation can provide considerable
improvement in the energy efficiency of electrical machines. Tolerating
motor terminal short circuit and avoiding magnet irreversible
demagnetization must be studied during the design and prototyping stage
of a permanent-magnet motor. Electrical machinery design increasingly
relies on the finite element analysis (FEA), where the various
interpretations of the linear recoil curve concept are the prevalent
tools to assess magnet's demagnetization. This study uses vibrating
sample magnetometer to observe the hysteresis behavior of two distinct
commercially available NdFeB magnet grades. The measured data are used
to study the forecasting ability of the
linear-recoil-curve-concept-based models: linear sloped, exponential,
hyperbolic tangent function, and two spline models with fixed and
changing permeability. The results indicate that none of the considered
approaches is universal. Nevertheless, the appropriately chosen
interpretation of the linear recoil curve concept may offer a relatively
accurate tool for the simulation of a rare-earth permanent magnet in an
electrical machine.

Last updated on 2020-20-03 at 10:03