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Evaluation of Demagnetization - 3rd quadrant of B-H curve

Hello,

I am trying to evaluate the performance of a partially demagnetized machine, which is demagnetized at ambient temperature, in FLUX 2D.

I found a pdf in the forum where the procedure to analyse the performance of a machine, including the demagnetization, is explained. The pdf is attached in this message. However, the procedure does not explain what to do if the demagnetization knee is in the 3rd quadrant of the B-H curve.

As it can be seen in the figure below, the demagnetization knee of my magnets is in the 3rd quadrant at ambient temperature. As far as I can understand, the model that is described in the pdf can estimate the location of the knee if it is in the 2nd quadrant. Is there any way to evaluate the performance of the machine in my scenario?

Thanks in advance,

Imanol

Community-Pasted-Attachment-1623260079795.png

Demagnetization Analysis With Flux 2D.pdf

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Flux

v2021.1

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Mohammed Elamin_22169

Hi Imaonel,

As far as I know all the non-linear models in Flux is able to describe the curve (hence the knee) in the second quadrant only, with the information in the third quadrant described as symmetrical or linear.

Thanks,

SimonGuicheteau

I think the demagnetization works the same if your non linear magnet knee is below 0. The principle remains the same with a recoil curve that gives a different Br locally.