Getting Started with Maxwell 3D (ANSOFT)

[gerbi]

You can change Magnitude but X-Y-Z components aswell. Field with orientation (1x,0y,0z) will be perfect opposite to (-1x,0y,0z).

About band.. You need to close moving object inside other object to which You'll asign a band.

Please, read the tutorials (especialy about Toyta Prius motor) - all basics are explained there.

 

[annalisemalta]

"You don't necessarily input extra inductance. The simulation will use the modeled inductance of the coil. Induced current will have 90 degree phase shift from the input voltage."


I know that... my problem is that the shift is a dc shift between the currents of the phases not between the voltage and the current, as in the attached screenshot

 

[annalisemalta]

Hi,

regarding the transient plots in Maxwell... What is the Moving1.Toqrue? and when exciting winding by current what is the voltage that is available for plotting? the induced voltage or the terminal voltage?

Thanks

 

[cimopata]

Hy Everyone!

I would like to ask for your help. There is a transformer transient tests on which I am doing.
I want to calculate or measure the amount of heat loss in [W] occurs in the core.

How do I do this?
Thanks
Bálint

 

[gerbi]

What is the Moving1.Toqrue?

Don't know. There is no info on it in help. Try plotting it and see how it behaves.

when exciting winding by current what is the voltage that is available for plotting?

it's voltage induced by the current, across the considered element

I want to calculate or measure the amount of heat loss in [W] occurs in the core.

In transient solver there is a possibility to define core loss model. Go to material properties, from menu choose "core loss type" -> "electrical steel". Some more coefficients are now avaible in your window. At the bottom from the menu choose "calculate properties for" -> "core loss at one frequency". In new window enter data You have (frequency, thickness etc.), You should have it from core material manufarcturer and transformer design data. If You don't know sheet material conductivity, which is not so easy to obtain, go with ~2 MS/m.

Ok, with material properties setup ready go to Maxwell2D/3D -> Excitations -> Set Core Loss. Pick core element (if material props are fine, there should be check in right column).
Make mesh refinement in core (accuracy of losses calculation depends on calculated flux distribution) and solve model.
For results plot core loss vs time in results -> create transient report-> rectangular plot.

 

[cimopata]

Don't know. There is no info on it in help. Try plotting it and see how it behaves.

it's voltage induced by the current, across the considered element


In transient solver there is a possibility to define core loss model. Go to material properties, from menu choose "core loss type" -> "electrical steel". Some more coefficients are now avaible in your window. At the bottom from the menu choose "calculate properties for" -> "core loss at one frequency". In new window enter data You have (frequency, thickness etc.), You should have it from core material manufarcturer and transformer design data. If You don't know sheet material conductivity, which is not so easy to obtain, go with ~2 MS/m.

Ok, with material properties setup ready go to Maxwell2D/3D -> Excitations -> Set Core Loss. Pick core element (if material props are fine, there should be check in right column).
Make mesh refinement in core (accuracy of losses calculation depends on calculated flux distribution) and solve model.
For results plot core loss vs time in results -> create transient report-> rectangular plot.

Thanks for your help!

Yes, I found this options and I adjusted the core losses in 25°C(by the "power ferrit" core loss type).
Actually I'm using N87 ferrit core. I already can measure the core loss. The results is very nice :)
The next step what I would like to do is the "Thermal modifier".
By the core loss type I have Power ferrite. There is 3 value (Cm, X, Y). Every value have "Edit thermal modifier" option. In this window how can I adjust the loss for example 100°C?

Thanks!
Best Regards!
Bálint

 

[cimopata]

Other quoestion:

The simulation is very slow. 50us transient (0.5us step) takes about 20 hour. I would like to speed up. My toroids dimension is about 50mmx16mm. What is the recomended mesh size (faster simulation/precise caltulation).

My compure:
Intel core i7
6GB 1333mHz RAM

Thanks!

 

[gerbi]

[..] how can I adjust the loss for example 100°C?

I'm sorry, but I have no expierence in this field. It appears that You'll need to read some articles about material properties of power ferrite. Maxwell help contain no detailed information on this one.

The simulation is very slow. 50us transient (0.5us step) takes about 20 hour. I would like to speed up. My toroids dimension is about 50mmx16mm. What is the recomended mesh size (faster simulation/precise caltulation).

It depends. For some crude calculations (to get familiar with model, results etc) mesh shouldn't be very fine.
For this first few simulations and 3D model about few thousand elements ? Thats my guess. For more detailed calculations few times more, but do not create monstrous mesh because it won't help accuracy much.

Some more hints on mesh:
1) Observe calculated energy error in solution data. If it is below 0,5% You can assume it is quite accurate (very accurate below 0,1%).
2) Do some simulations in static solvers (like Eddycurrent). Mesh is done adaptively then. You can observe which areas have increased meshing and do similary in transient solver manually.
3) Observe results (mostly flux distribution). Field details like increased density (if present) should be visible and look natural.
3) Meshing is one of most important things in FEM, it's better to learn how good mesh looks like.

 

[eddyrooney87]

hi gerbi,

i have difficulties on assigning current to my coil as it is wounded on cylinder core. When I want to assign current, this error occur "Excitation 'Current 1':Cannot apply Current Excitation to non planar entity". Any tips and help from you.

Thanks

 

[cimopata]

Some more hints on mesh:
1) Observe calculated energy error in solution data. If it is below 0,5% You can assume it is quite accurate (very accurate below 0,1%).
2) Do some simulations in static solvers (like Eddycurrent). Mesh is done adaptively then. You can observe which areas have increased meshing and do similary in transient solver manually.
3) Observe results (mostly flux distribution). Field details like increased density (if present) should be visible and look natural.
3) Meshing is one of most important things in FEM, it's better to learn how good mesh looks like.

Thanks gerbi!

I am going to try it!

Maybe have you any experience the distributed mode computing between computers?
I tried, but there is something error message:
"Error: Unable to contact AnsoftRSMService, Reason: ANS_CANNOT_CONNECTTO_ANSOFTRSMSERVICE
Testing Completed.
Error: Some tests have failed.

 

[siva0707]

hello frnds..
hoep you all doing good.
i am a mechanical engineer but works in electrical engineering. my work is electromechanical interactions in induction motors. so i started working in ansoft. so kindly anyone help me in the modeling of induction machine in ansoft. i am working with 3 phase 4 pole induction machine and it will me helpful for my work.

thanks
with regards
siva

 

[nautylus]

Hi,
i'm new user and I've studied ansoft maxwell for three months..
i need some help : i want to do calculate second harmonics in a magnetic material (for examp. between 2 magnetic rings center)
how can i calculate that by field calculator ??
thanks with regards

 

[gerbi]

Maybe have you any experience the distributed mode computing between computers?

I have no expierence with this. One is for sure, You'll need more than one Maxwell license to do this

i am a mechanical engineer but works in electrical engineering. my work is electromechanical interactions in induction motors. so i started working in ansoft. so kindly anyone help me in the modeling of induction machine in ansoft

Sorry to say that, but it's not that easy. If You have no expierence in EE or in Maxwell then this is really long way.. You need some professional help, not just question-answer discussion like here.

i want to do calculate second harmonics in a magnetic material (for examp. between 2 magnetic rings center)
how can i calculate that by field calculator ??

Try performing FFT on this signal. If signal is implemented in Maxwell go to Results-> Perform FFT on report.
If signal is not defined:
1) define a line on which You want to observe signal
2) go to results -> create rectangular plot
3) in left window you pick name of solution and geometry (your created line) and number of sampling points on it (pick some reasonable number, depending on mesh)
4) pick quantity to plot (some are ready to use, to have more go and create defined expression in calculator)
5) create new report and do FFT on it (Results-> Perform FFT on report). I have no big expierence with this FFT module.

This can be done in Maxwell v14 3D Transient.

 

[nautylus]

Thanx Gerbi,
i've some experience abut your suggestions (i had created a line and rect. plot etc.) but i want to see some definite equations in the center area if it works, i mean how can i load a spesific formula actually?
thanx again

 

[gerbi]

but i want to see some definite equations in the center area if it works, i mean how can i load a spesific formula actually?

Please be more specific. What equations do you want to see (in caluculator, right?) ?
If you mean FFT equations - this is not possible. To define FFT analysis other that implemented in Maxwell - you need to perform FFT in program outside Maxwell (with data outputed from Maxwell).
If you mean defining in calculator a expression to plot.. You need to work with calculator.
How to define a expression for further use ? Quick example:
Quantity->B
Scalar->ScalarX
Add->(pick a name, like Bx or so)
This viariable (Bx) is visible in calculator now (named expressions window, top of calculator) and you can plot it on defined geometry (rectangular plot, on model etc.).
Is this an answer to your question ?

 

[nautylus]

Thank you very much Gerbi..
it works really (your calc. definitions)... for the other one i guess i need to perform FFT program ouside...
thanx with regards.

 

[siva0707]

RMxprt (ANSOFT)

Hi gerbi..
i have done the modelling of three phase induction machine in RMxprt. i gave data's such as stator information, rotor information, winding information. when i export this to Maxwell 2D, i am not able to get the full model, its coming as only half model. how can i get the full model when exporting into maxwell 2d??

thnks
with regards
siva

 

[gerbi]

I have no expierence in RMxpert, but if You have half of the model and You want full.. how about duplicating it (mirror) and uniting cutted parts in Maxwell?

 

[Fuxue Jin]

For core loss, I have not done much but here is what I believe.

The core loss data set in Maxwell is used to define Cm, X and Y three parameters (after fitting the loss curve). With these three parameters, the core loss is calculated at any give frequency when the simulation runs.

For thermal, basically you need define how these three parameters change with temperature, either by a equation or data set.

Again, I have not done much but that is what I understand. However, simulation results about core loss in Maxwell is not that accurate.

Thanks for your help!

Yes, I found this options and I adjusted the core losses in 25°C(by the "power ferrit" core loss type).
Actually I'm using N87 ferrit core. I already can measure the core loss. The results is very nice :)
The next step what I would like to do is the "Thermal modifier".
By the core loss type I have Power ferrite. There is 3 value (Cm, X, Y). Every value have "Edit thermal modifier" option. In this window how can I adjust the loss for example 100°C?

Thanks!
Best Regards!
Bálint

 

[Fuxue Jin]

When you run transient simulation, the initial setup only use the initial mesh. It doesn't refine the mesh as it does in Magnetostatic.

Other quoestion:

The simulation is very slow. 50us transient (0.5us step) takes about 20 hour. I would like to speed up. My toroids dimension is about 50mmx16mm. What is the recomended mesh size (faster simulation/precise caltulation).

My compure:
Intel core i7
6GB 1333mHz RAM

Thanks!

 

[Fuxue Jin]

I believe distributed mode needs separate license.

Thanks gerbi!

I am going to try it!

Maybe have you any experience the distributed mode computing between computers?
I tried, but there is something error message:
"Error: Unable to contact AnsoftRSMService, Reason: ANS_CANNOT_CONNECTTO_ANSOFTRSMSERVICE
Testing Completed.
Error: Some tests have failed.

 

[klmnopq]

I need to simulate machines in maxwell

any tutorial for begainners like me?

 

[gerbi]

I need to simulate machines in maxwell

any tutorial for begainners like me?

write me your e-mail in private message, i'll send them to you

 

[homer5785]

Hey guys,

im using Maxwell 3D V14 in transient mode to simulate a pulse transformer. So imho it is useful to implement a frequency dependend magnetic permeability given in most datasheets of magnet materials. I found a how-to here:
http://www.psma.com/sites/default/f...ferrite-core-electronic-planar-transforme.pdf

But when I simulate a step response of a pulse transformer in this way the simulation does not converge very well. I think this is because of the fact that I haven't defined the permeability for up to the highest frequencies in the step. But unfortunately I get not more data from the datasheet. What does Maxwell if there are out of range data in a dataset?

Thanks in advance

homer

 

[jynth]

Hi all,

I'm a new user and i need some info on an error message i got while doing a busbar inductance simulation which says " Could not preserve critical nodes " Now where can I see in the software that shows these critical nodes so that I can fix it. Or may be in the meshing is parameters what would be the ideal settings.

I would thank anyone who can help me do a quick fix!
:)

 

[annalisemalta]

Hi,
I am also new to Maxwell and I am trying to simulate my model in 3D. however I am getting this error:

There is an error in executing 'mesh3d'

even though I created a separate mesh for each item

thanks

 

[cimopata]

Hy all!

I continued the torroid transformer simulation, but I discovered some weird things.
I measure:
-input power
-output power
-core loss
-solid loss
-standed loss
-standedR loss
I add these values but there is still have missing power.

To simplify the measurement I creat a simple O ring core and one primer coil.
The imput voltage is +/-100V square. The core is N87 ferrite adjusted B-H curve and core loss.
I attached the maxwell 15.0 file and a Excel file I calculated the power.
The comutate result is:
Pin: 3.483733733W
Pout: 0.002990193W (it is heat actuaally)
So where is my sweet 3.480743539W ? :D

Thanks!
BR.
Balint!

 

[cimopata]

And here is the excel:

 

[sourav kundu]

Hi gerbi..
i have done the modelling of three phase induction machine in RMxprt. i gave data's such as stator information, rotor information, winding information. when i export this to Maxwell 2D, i am not able to get the full model, its coming as only half model. how can i get the full model when exporting into maxwell 2d??

thnks
with regards
siva

Figured it out. Go to Maxwell 2D → Design Properties. Change the value in fractions from 2 (or as in my case 4) to 1. That's all. Good luck.

Regards
Sourav

 

[homer5785]

Has anybody an anwer for me? Ref.

Hey guys,

im using Maxwell 3D V14 in transient mode to simulate a pulse transformer. So imho it is useful to implement a frequency dependend magnetic permeability given in most datasheets of magnet materials. I found a how-to here:
http://www.psma.com/sites/default/fi...transforme.pdf

But when I simulate a step response of a pulse transformer in this way the simulation does not converge very well. I think this is because of the fact that I haven't defined the permeability for up to the highest frequencies in the step. But unfortunately I get not more data from the datasheet. What does Maxwell if there are out of range data in a dataset?

Thanks in advance

homer

I tried exactly the way in the publication (page 11-14) but up to now the simulation does not converge.
My magnet material (Epcos N30) is defined for frequencies up to 4MHz. I now tried with a "slower" step with a rise time of 200ns. This should avoid frequencies above 4MHz but even with this approach the simulation doesn't work.

One problem is that Maxwell is not starting without a setted Core Loss Type ("Nonlinear assignment required...") so I setted this to Power Ferrite but setted the parameters zero. Unfortunately I have no parameters for that but I think the core losses must be included in the Magnetic loss tangent.

Any ideas?

Thanks in advance

homer