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

Imanol
Imanol Altair Community Member
edited June 2021 in Community Q&A

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?

image

Thanks in advance,

 

Imanol

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Answers

  • Mohammed Elamin_22169
    Mohammed Elamin_22169 New Altair Community Member
    edited June 2021

    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
    SimonGuicheteau
    Altair Employee
    edited June 2021

    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.

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