Work

Optimisation of an Automotive Permanent Magnet Motor with Low Coercivity Recycled Magnets Considering Demagnetisation

Year: 2025

Type: conference-paper

Abstract: Permanent Magnets (PM) containing Rare Earth Elements (REE) are widely used in the automotive industry to achieve power-dense and efficient motor designs. However, their supply chain is highly vulnerable and subject to significant price fluctuations. Consequently, recycling PMs with REEs presents a sustainable alternative to mitigate these issues, but the recycling process can weaken the magnetic properties of these magnets. The higher risk of demagnetisation, lower temperature tolerance, and reduced flux density make it challenging to achieve power-dense and efficient motor designs. Therefore, this article introduces an optimisation methodology for permanent magnet motors accounting for demagnetisation. Optimisations of five rotor topologies were carried out first, and considering magnet mass, power capability, and the resistance to demagnetisation, the V-Blockshaped rotor topology was identified as the best candidate. The selected candidate accomplished all the requirements, with a high power capability and no demagnetisation.

Source: IEEE Workshop on Electrical Machines Design, Control and Diagnosis

DOI: 10.1109/wemdcd61816.2025.11014133

Authors: Beñat Arribas, Gaizka Almandoz, Aritz Egea, Javier Poza, Fernando Garramiola, Gaizka Ugalde

Institution: Mondragon Unibertsitatea

Language: English

Topic: Electric Motor Design and Analysis

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Responsible consumption and production

Open Access status: bronze

Funder: European Commission