Axial Force Negative Stiffness in Axial-Flux Electric Machines

Wen Liang Soong; Emad Roshandel; Zhi Cao; Amin Mahmoudi; Solmaz Kahourzade

doi:10.1049/elp2.70095

Axial Force Negative Stiffness in Axial-Flux Electric Machines

Wen Liang Soong, Emad Roshandel, Zhi Cao, Amin Mahmoudi, Solmaz Kahourzade

College of Science and Engineering

Research output: Contribution to journal › Article › peer-review

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Abstract

This paper examines the axial force negative stiffness of the induction and permanent magnet (PM) axial-flux machines. Simplified analytical models are used to identify the key normalised machine parameters which affect the variation of the axial force with the airgap length. The analytical results are validated against finite-element simulation and experimental results from axial force tests comparing the negative stiffness of the induction and PM axial-flux machines. Finally, the effect of load, the use of double-sided machines and tilting torque are examined.

Original language	English
Article number	e70095
Number of pages	14
Journal	IET Electric Power Applications
Volume	19
Issue number	1
DOIs	https://doi.org/10.1049/elp2.70095
Publication status	Published - Jan 2025

Keywords

electric machines
electromagnetic forces
induction motors
permanent magnet machines

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10.1049/elp2.70095Licence: CC BY-NC-ND

Final published versionFinal published version, 2.64 MBLicence: CC BY-NC-ND

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abstract = "This paper examines the axial force negative stiffness of the induction and permanent magnet (PM) axial-flux machines. Simplified analytical models are used to identify the key normalised machine parameters which affect the variation of the axial force with the airgap length. The analytical results are validated against finite-element simulation and experimental results from axial force tests comparing the negative stiffness of the induction and PM axial-flux machines. Finally, the effect of load, the use of double-sided machines and tilting torque are examined.",

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AB - This paper examines the axial force negative stiffness of the induction and permanent magnet (PM) axial-flux machines. Simplified analytical models are used to identify the key normalised machine parameters which affect the variation of the axial force with the airgap length. The analytical results are validated against finite-element simulation and experimental results from axial force tests comparing the negative stiffness of the induction and PM axial-flux machines. Finally, the effect of load, the use of double-sided machines and tilting torque are examined.

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Axial Force Negative Stiffness in Axial-Flux Electric Machines

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