Equivalent BH curve with using Steady State AC Magnetics

MBIASION

Dear all,

I'm trying to simulate the no-load test of a three-phase Induction Machine using the Steady State AC Magnetics application.

I'm supplying the machine with sinusoidal voltages on the stator; therefore I'm modeling the equivalent magnetization curve using the "sine wave flux density" option.

Is it possible to get the equivalent magnetization curve internally determined by Flux? I would like to compare that with the "original" curve provided by the manufacturer, that is, the curve I'm inputting in Flux.

Thank you in advance for your help!

asoualmi

Hi,

One you represent your material by “equivalent magnetization curve using the sine wave flux density option”, Flux compute some coefficients (initial relative permeability, saturation magnetization and knee adjustment coefficient). You have the possibility to represent your material using the coefficient computed by Flux. When you create the material use magnetic propriety type “isotropic analytic saturation+ knee adjustment (arctg, 3coef) equivalent model.”

Hope this will help.

Best regards.

MBIASION

What you explained is fine, but there's still something unclear... I can describe you in detail what I did.

- I inputted a BH curve from the manufacturer, represented using "isotropic spline saturation" model.

- Since I'm performing simulations using the "steady state AC magnetic" application provided with FLUX, I have to choose a way to determine an equivalent BH curve (internally computed by FLUX) starting from the one provided by the manufacturer.

- I'm modeling a voltage-driven device, therefore I selected a "sine wave flux density" approximation.

- In the box below “isotropic analytic saturation + knee adjustment (arctg, 3coef) equivalent model” I can find three different parameters:

1) are those parameters representing the equivalent BH curve, computed under "sine wave flux density" approximation?

2) the parameters don't change if I try to model the BH curve using different strategies (sine wave magnetic field, mixed, average value of Nu over a cycle). Can you explain me why?

Thank you in advance for your help!

Best regards

asoualmi

Hi,

Sorry for the delay and for misunderstood your question. I checked, unfortunately there is no easy way to display this curve in Flux. I will create a feature request to take into account of your request.

May be there a workaround to do this. We need to:

• Create a square in Flux 3D (steady state AC application)
• We impose a B as boundary condition
• Use your material (for different cases: sine wave flux density…)
• Create sensors to compute the B and H
• Solve the project
• Display the sensors (B as function of H)

I attached the Flux project. You need to create your material and change the material of the region and do different cases.

Best regards.

Marco Biasion

Hi,

thank you so much for your helpful suggestion!

Happy holidays!

Best regards,

Marco

 

asoualmi

Marco Biasion said:

Hi,

thank you so much for your helpful suggestion!

Happy holidays!

Best regards,

Marco

 

You are welcome.