Investigation of alternative magnet configurations in a biased-flux machine

Afrank, M; Amirkhani, M; Farahani, EF; Mirsalim, M; Baker, NJ

doi:10.1049/icp.2024.2181

Investigation of alternative magnet configurations in a biased-flux machine

Lookup NU author(s): Dr Ehsan Farahani ORCiD, Professor Nick Baker ORCiD

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Abstract

© The Institution of Engineering & Technology 2024. Biased flux motors are a type of electric machine which operate in an unconventional manner but can offer structural and performance advantages over more conventional topologies. Achieving a suitable design in this relatively uncommon topology requires identifying the effect of various factors on their performance. Even small changes in the structure and magnet configuration can have a significant impact on performance. In this paper, the magnet configuration, flux barriers, and bridges are investigated to try and improve the performance of a base-line biased-flux motor. The details of the structure and operating principles are explained and structures are optimized for torque production in a fixed volume. The no-load and full-load operations of alternative variants is studied in terms of cogging torque, flux density, flux line, torque profiles, and over-load capability. Moreover, a complete comparison has been made between split magnet and single magnet topologies in an inter-modular permanent magnet motor. The magnetic stresses on the PMs are studied to assess the demagnetization risks. It is been explained how splitting the magnets and the introduction of flux barriers increases the torque density and flux bridges decrease the demagnetization risk.