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<p>Magneto-mechanical effects significantly influence the magnetic behavior of ferromagnetic materials in rotating electrical machines, particularly at high rotational speeds. Mechanical stress arising from manufacturing processes or centrifugal loading can substantially alter magnetic properties such as magnetization and permeability, thereby degrading electromagnetic performance and efficiency. In practice, these effects are often neglected or oversimplified in conventional machine modeling and finite element (FE) simulations. This work presents an integrated approach to investigating magneto-mechanical coupling in permanent magnet synchronous machines (PMSMs). Stress-dependent magnetization curves are experimentally characterized using a&#xa0;universal single sheet tester and incorporated into a&#xa0;physically motivated, stress- and orientation-dependent material model. The implementation of this model into a&#xa0;finite element framework enables a&#xa0;coupled magneto-mechanical analysis of the machine. Mechanical stress distributions are first determined via structural FE analysis and subsequently used as local input parameters for the magnetic field simulation. The results demonstrate that magneto-mechanical effects can cause significant local reductions in magnetic flux density and distortions of the flux paths, especially in highly stressed rotor regions at elevated speeds. Furthermore, it is shown that rotor design modifications such as targeted cut-outs can reduce stress concentrations and mitigate magneto-mechanically induced degradation of the magnetic properties.</p>

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Integrierte Betrachtung magneto-mechanischer Effekte in der Entwicklung energieeffizienter rotierender Maschinen

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月23日

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  • Achref Douiri,
  • Danilo Aurich,
  • Simon Steentjes,
  • Nora Leuning

摘要

Magneto-mechanical effects significantly influence the magnetic behavior of ferromagnetic materials in rotating electrical machines, particularly at high rotational speeds. Mechanical stress arising from manufacturing processes or centrifugal loading can substantially alter magnetic properties such as magnetization and permeability, thereby degrading electromagnetic performance and efficiency. In practice, these effects are often neglected or oversimplified in conventional machine modeling and finite element (FE) simulations. This work presents an integrated approach to investigating magneto-mechanical coupling in permanent magnet synchronous machines (PMSMs). Stress-dependent magnetization curves are experimentally characterized using a universal single sheet tester and incorporated into a physically motivated, stress- and orientation-dependent material model. The implementation of this model into a finite element framework enables a coupled magneto-mechanical analysis of the machine. Mechanical stress distributions are first determined via structural FE analysis and subsequently used as local input parameters for the magnetic field simulation. The results demonstrate that magneto-mechanical effects can cause significant local reductions in magnetic flux density and distortions of the flux paths, especially in highly stressed rotor regions at elevated speeds. Furthermore, it is shown that rotor design modifications such as targeted cut-outs can reduce stress concentrations and mitigate magneto-mechanically induced degradation of the magnetic properties.