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Lamination Punching Edges & Packaging: Investigation / Consideration

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Hello!

In the sake of simulation accuracy, we want to consider effects for lamination materials originating from punching edges and stacking / packaging / bundling within our simulation models. As Veigel has shown in https://publikationen.bibliothek.kit.edu/1000084543/15671960, packaging has significant influences on iron losses (up to 60 % more losses from packaging and punching edges than reference values from manufacturers). Bauer mentioned in https://www.springer.com/de/book/9783658242718, that one way to consider influences from punching edges is to use parameters for impacted regions from lamination materials, that were not finally heat treated and annealed, respectively, resulting in higher losses and differing magnetization behavior. One question, that still remains, is, how to model influences from packaging in FLUX? However, I wanted to ask, if there are any lamination materials within the FLUX material explorer, which may behave like non-finally annealed laminations regarding losses and magnetization curves? Thanks in advance for any response!

 

Best regards, Michael

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Hello Michael,

 

Thank you for your post, you are really talking about an interesting subject. I know well that a fully characterization of BH curves and losses of ferromagnetic materials is not an easy task. Even when we have estimations from manufacturers, the difference between simulations and measures may be high.

Unfortunately, Flux material database does not have materials representing non-finally annealed laminations. Anyway, there are several ways to represent this behaviour un Flux, taking advantage of region type “Laminated magnetic non conducting region”.

In these regions, you can provide Bertotti’s coefficient in material description or after, in postprocessing. If you know what areas of your machine will be affected by edges and packaging effects, you can define a specific region for them and assign particular Bertotti’s coefficients or BH curves, which may differ from the values uses to describe the rest of your ferromagnetic material.

Hope this helps.

Best regards,

Alejandro Rodríguez

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Hello Alejandro,

thanks for your response. I agree with you, that adjusting loss parameters may correct the material behavior. Unfortunately, even lamination manufacturer cannot support us with data from non-finally annealed laminations. Maybe, a nice feature in future FLUX releases could be, when assigning material for a region, that the material behavior can be adjusted via a parameter representing the punching edge width. For the affected regions from punching edges, a lower stacking factor can be used in loss calculation (resulting in higher flux density amplitudes). But still, the B(H) magnetization behavior of the material needs to be adjusted and that's actually the crux. I hope you can regard this issue in future releases...

 

Best regards,

Michael

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