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Mostafa Ahmadi

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  1. Hi, I have done what you said but I still have the problem. I was wondering if you could kindly check this situation. Thank you in advance,
  2. Hi I have faced this error while I was trying to use Flux e-Machine toolbox. Would you please how to solve this
  3. Hi Mr. Abdessamed, Thank you for your reply and checking the model I sent you. I was wondering if you could help me to use my material properties. I have used the material properties reported in the tutorial Mr. Zidat sent me. The B(H) was okay and also there was no error. I tried to use the same procedure for the new PM materials which I shared the BH curves. For PM_1 there was an error which said "The computation of Js is not possible with these input values. Please check the values that define the B(H) model". For the PM_2, there was no error but when I tried to get the B(H) using your model, I got the wrong B(H). I would be really thankful if you could give me any suggestion to overcome these problems. Kind regards, Mostafa
  4. Hi I provided the characteristics of the materials. Would you please check it and explain why the material is not correct? thank you in advance
  5. Is there a way to check the input using analytical calculation?
  6. Hi, Yes, I have the material characteristics. I put the ... of both PM_1 and PM_2. I have tried to plot the characteristics of PM_2 using the flux file you sent me, the obtained result was not correct. I think there is problem in the parameters I considered for the materials.
  7. Hello Mr. Abdessamed, Thank you so much for your explanation. I have faced a warning which does not allow me to solve the scenario. checkPhysic executed The computation of Js is not possible with these input values. Please check the values that define the B(H) model. The magnet properties were inserted in FluxMotor>materials part as I attached the screen of magnetic properties tab. I also attached the simulation file too. Would you please explain how to cope with this condition. Thank you so much in advance. Model.zip
  8. Dear Mr. Zidat, Thank you so much for the shared document, it was really useful. Is it possible to plot the demagnetization cure of the defined material as shown in the help file? Demagnetization model plotted in the help file Demagnetization model plotted in the software environment
  9. Hi, I have a question on evaluation demagnetization using Altair Flux. There are some guide in the software and I have read all of them including: 1- software help part entitled "How to use “Evaluation of the demagnetization” in Flux?" 2- in "Altair\2019\flux\Extensions\Macros\Macros_Flux2D_Physics\RunDemagnetization2D.PFM" 3- a video on YouTube "https://www.youtube.com/watch?v=D_wk_Mvpa5U " different methods have been explained in these references, and they are not clear at least for me. In the first method, it is mentioned that the nonlinear properties of the magnet should be inserted, the second one, both linear and nonlinear can be considered, and in the third way, there is another denitrification. What are the differences between these methods (1 and 2)? First of all, I would like to know which graph you mean by nonlinear (the red one as shown in the following picture), if yes can you explain why and how flux calculate the working points? and if the green one is the correct, a the (Bi, Hi) of this line should be considered as a nonlinear? How can see the effect of demagnetization on the machine performance (torque, magnet loss, ...)? Does the flux use the nonlinear model for PM loss calculation or the PM loss should be calculated by inserting resistivity of the PM? Would you please explain about this more or provide any help which I can use for my work. How can I used the third approach? When I use the PM properties, I have faced error related to the value of "transversal relative permeability". As I asked before, Mr. Abdessamed said that it was like air and I could use "1", but I couldn't use this number in my model. I would be really thankful if you could explain more about this. Thank you so much in advance for time and consideration. Kindest regards, RunDemagnetisation2D.pdf
  10. Hi, Thank you so much for your explanations. Kind regards,
  11. Hi Thank you for you guidance. I have done the same but there is a problem related to the time of simulation. I think there is a problem in the model because without considering the "PM loss using solid conductors" the simulation time was around 2 hours (102 steps) but considering the "PM loss using solid conductors" has been taken around 5 days just for 5 steps. Is the problem related to mesh? Can you guide me to solve the problem and speed up the simulation time? Yours faithfully,
  12. Hi This is a very good presentation on meshing. I have a question on meshing axial flux machines. How to used layered meshed in this case properly to get the correct value for the cogging torque? A short explanation on the model: for modeling the airgap, I divided the airgap into two, rotating and static. I have drawn the geometry as follow, the dynamic airgap is connected to the PMs (the white volume), and the static airgap hasn't drawn specifically, and it is considered as the rest of air (the volume inside the infinite box). I think this the same has been considered in the example of the software too.
  13. Hi I was wondering to know how to calculate the PM loss in 3D. I use solid coil in 2D but this approach is not possible in 3D. Can you guide me how to do it. Thank you in advance. Best regards,
  14. Dear Sir/madam, I have simulated a machine and used Bertotti and LS model for calculating the losses. I can not understand why the waveform of the loss is like that, specially the negative values. I would be really thankful if you could explain the reason of this. Best regards,
  15. Hi I have done what you explained but I still have the problem. Is it related to the version of MATLAB?
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