Abstract
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.
Highlights
Increasing the power density of highly utilized traction drives is a frequently discussed research topic
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
An analytical as well as an experimental approach are performed to study the influence of the silicon and aluminum content of soft magnetic materials on their thermal conductivity
Summary
Ρel with the Lorenz number L0 and the temperature θ. Correlations or validated data for the thermal conductivity of soft magnetic material are not frequently studied. Exact knowledge about the thermal conductivity of soft magnetic materials is crucial for its selection. An analytical as well as an experimental approach is introduced to obtain data for the thermal conductivity of soft magnetic materials. Measurements of the electric resistivity ρel in dependency of the temperature θ are performed to have sufficient data input for the analytical approach. The results of the thermal conductivity in dependency of the temperature k(θ) are compared between the indirect measurement and the analytical approach. In order to analyze the accuracy, an estimation of a possible measurement error is performed. This error estimation is aimed to represent the worst possible measurement error. The cv is calculated by a division of the standard deviation of a measurement sequence and the gained average value
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