期刊
ENERGIES
卷 14, 期 17, 页码 -出版社
MDPI
DOI: 10.3390/en14175310
关键词
induction machines; electrical machines; thermal modeling; soft magnetic material; thermal conductivity
资金
- German Federal Ministry for Economic Affairs and Enegry (BMWi) [Concept-ELV2(01MY17002B)]
- BMWi
The power density of traction drives can be increased with advanced cooling systems or reduced losses. Studies on soft magnetic material parameters and their influence on magnetization and loss behavior are well-studied, while influencing factors on thermal conductivity are less common. Analysis of eight different soft magnetic materials shows good agreement between analytical and experimental approaches, except for very thin specimens. The study highlights the significant influence of different soft magnetic materials on heat extraction in a given application.
The power density of traction drives can be increased with advanced cooling systems or reduced losses. In induction machines with housing and shaft cooling, the produced heat in the stator and rotor winding system needs to be extracted over the rotor and stator lamination. The influence of soft magnetic material parameters, such as texture, thickness or alloy components on the magnetization and loss behavior, are well studied. Studies about influencing factors on the thermal conductivity are hard to find. Within this study, eight different soft magnetic materials are analyzed. An analytical approach is introduced to calculate the thermal conductivity. Temperature-dependent measurements of the electric resistivity are performed to obtain sufficient data for the analytical approach. An experimental approach is performed. The thermal diffusivity, density, and specific heat capacity are determined. An accuracy study of all measurements is performed. The analytical and the experimental approach show good agreement for all materials, except very thin specimens. The estimated measurement error of those specimens has high values. The simplified case study illustrates the significant influence of the different soft magnetic materials on the capability to extract the heat in the given application.
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