MMF Harmonic Analysis

Unknown
Unknown
edited November 2022 in Community Q&A

image

image

Hello,
here i have made a reluctance motor on Fluxmotor then i exported it to Flux 2d to check the harmonics again but the results from Fluxmotor were different compared to Flux 2d . 
Why is that? which one should i take into concideration?

kind regards 

Ali

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Best Answer

  • Unknown
    Unknown
    edited November 2022 Answer ✓
    Abdessamed said:

    Hi,

    In the case of FLux when you do the FFT you do for the whole motor? or for one part (for example you represent one pole). if it is the case can you try to do it for the whole motor.

    Keep us informed.

    Thanks.

    I have done it for the whole motor .

Answers

  • asoualmi
    asoualmi
    Altair Employee
    edited November 2022

    Hi,

    In the case of FLux when you do the FFT you do for the whole motor? or for one part (for example you represent one pole). if it is the case can you try to do it for the whole motor.

    Keep us informed.

    Thanks.

  • Unknown
    Unknown
    edited November 2022 Answer ✓
    Abdessamed said:

    Hi,

    In the case of FLux when you do the FFT you do for the whole motor? or for one part (for example you represent one pole). if it is the case can you try to do it for the whole motor.

    Keep us informed.

    Thanks.

    I have done it for the whole motor .

  • asoualmi
    asoualmi
    Altair Employee
    edited November 2022

    From the sahred picture, in FluxMtor you dispaly the MMF and in Flux you display the radial component of the flux density? is right.

  • Unknown
    Unknown
    edited November 2022
    Abdessamed said:

    From the sahred picture, in FluxMtor you dispaly the MMF and in Flux you display the radial component of the flux density? is right.

    yes exactly.
    doesnt that mean that it should have the same shape at least . 
    we can see big difference between the two pics

  • Unknown
    Unknown
    edited November 2022
    Ali_20269 said:

    yes exactly.
    doesnt that mean that it should have the same shape at least . 
    we can see big difference between the two pics

    We calculated the radial component of the flux density because there is no other option to display the MMF in Flux 2D, as we were told since a colleague from Altair suggested us this solution to compute the MMF.

    We want to know the influence of our rotor geometry changes into the MMF in order to improve our performance regarding the torque ripple. As far as we are concerned, the MMF has the most influence on the torque ripple.

    Unfortunately we cannot display the MMF in Flux Motor when we modify the rotor geometry, since Flux Motor works only with the predefined geometries. That is the background of why we want to compute the MMF in Flux 2D.

     

    Could you help us finding the best way to do it?

  • asoualmi
    asoualmi
    Altair Employee
    edited November 2022
    Ali_20269 said:

    We calculated the radial component of the flux density because there is no other option to display the MMF in Flux 2D, as we were told since a colleague from Altair suggested us this solution to compute the MMF.

    We want to know the influence of our rotor geometry changes into the MMF in order to improve our performance regarding the torque ripple. As far as we are concerned, the MMF has the most influence on the torque ripple.

    Unfortunately we cannot display the MMF in Flux Motor when we modify the rotor geometry, since Flux Motor works only with the predefined geometries. That is the background of why we want to compute the MMF in Flux 2D.

     

    Could you help us finding the best way to do it?

    Hi,

    Sorry for the delay. You are right there no function allows to compute the MMF in Flux, but you can do it by computing the magnetic field (H) in the air gap using a path. The MMF is the product between the current and the number of turns and  this equal to the integral of the  magnetic field along a  path.

    Thanks.

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