Maxwell 3D (ANSOFT)

homer5785

Has anybody an anwer for me? Ref. 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

siva0707

hi guys..
i am doing analysis on 4-pole induction machines. i want to couple an electrical circuit with magnetic circuit in ansys. anybody having tutorials for that...basically am from mechanical background. i am struggling a little bit. so kindly help me for the same.

is it possible to do couple field analysis in ansoft maxwell ???

thanks
with regards
Siva

siva0707

Hi ..

hope you are all doing good..

i need a help...

currently am working in Ansoft Maxwell,s 2D.

I created a RMXPRT model for 3 phase induction machine. then i exported to MAXWELL2D design.

its a 4-pole 3 phase induction machine. the machine has 60 slots.
it has double layered winding.
the results of the winding currents looks like non-uniform. Phase A, Phase B and Phase C currents are not unique.

kindly give me some suggestions to get uniform winding currents.

Thanks
with Regards
SIVA

Attached Thumbnails

 

sophie ing

Hi guys,
I'm working in Ansoft Maxwell 3D, Transient.
I want to simulate a sort of brushless motor: it's composed by only two coil, with the same excitation. My coil are 108 turns, with 6 layers (18 turn per layer). I have some questions:
1) Is Coil terminal of each coil set to 108 turn?
2) Are there differences in coil terminal setting between the coil of this example and a coil with the same turns and the different number of layers (obviously in this case the geometry is different)?
3) Do I have to create two winding or I can associate the same at the two coil terminals?
4) In Winding properties, how do I have to set the parameter "number of parallel branches"? What is it?
Thanks in advance

Sophie

SirAskalot

Siva: What excitation do you have? Current or voltage source? External circuit?

Sophie: How are the two coils connected, Series or parallel?
There is a option in the coil terminal dialog asking for the number of turns: 108 turns.
Do this for both coils.
Make a winding and add the two coil terminals to this winding. Then specify the excitation for this winding, e.g 100*cos(2*pi*50*Time).

If the two windings are connected in parallel I think you must write 2 in the winding properties dialog box.

sophie ing

The two coil are connected in series.
Thank you

sophie ing

I have a problem in Maxwell 3D.
I tested a simple situation: I tried to calculated the magnetic field of a current loop.
In the center of the current loop, I expect the direction of the magnetic field parallel to the axis of the current loop, but in the simulation this doesn't happen (see in the picture). Why? What's wrong?

Thanks with regards
Sophie

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Attached Files

Project1.zip (24.6 KB, 8 views)

siva0707

Hi

Greetings to you all!!!

I got the three phase currents as a unique pattern with phase difference.

but i got the peak to peak current value is 9A only.

my configuration of the machine is
rated voltage 415V
rated power 27.75kW
Frequency 50Hz,
Rated Speed - 1470 rpm

i need to get peak to peak current value around 60A....

what should i need to do in the maxwell design?

thanks for your help in advance!!

and one more thing also..

how to calculate the power of an induction machine when the total number of strands are reduced to 3 from 4 strands? The rated output power of an existing machine is 37kW which has 4 strands and 11 turns. now it is reduced to 3 strands and 11 turns. now what will be the output power for the same machine? rated voltage is 410V, 50 Hz freq. machine has 60 slots. (basically i am from mechanical engineering, but i am working in electromechanical interactions in induction machine)

Thanks
Siva

kikicooot

Dear friends
I am student and I have exam about ansoft maxwell 3D.
I should simulate 3 phase asynchronous motor in ansoft maxwell 3D and to make several magnetostatic analysis.
Can someone help me?
I am beginner, so the best help for me is one finished project.
Please someone send me .rar file...

Shantanav

I am designing a 2D model of a three-phase core-type transformer in ANSOFT MAXWELL 14.0. While doing so I have encountered a strange problem.

Start of the problem:-

While designing the transformer, I wanted to incorporate core losses. So, I did the following steps:-

Excitations -> Set Eddy Effects -> checked the various core sections in my model (because eddy current effects occur in the transformer core)

and also

Excitations -> Set Core Loss - > checked the various core sections in my model (because core loss effects occur in the transformer core)

Symptoms :-

Model simulated (using transient solution type) and then gives the following wrong results:

1) Line currents on the primary side (star-connected) are very high (about 10 times)

2) Secondary side (delta connected) phase currents lose their phase dependence, i.e. the phase currents are no more 120 degrees apart, they all are in phase now. However, the secondary line currents are Ok though.

Additional Information :-

If I do not consider eddy current and core loss effects, then the model simulates to give correct results.

Please provide me suggestions/hints/solutions to my problem - how to incorporate core losses correctly in my model.

gerbi

Hi

Turn off eddy effect in core (turn it off in the windings as well), use only core loss calculations (based on core material loss curve P[W/kg] vs B [T] at single frequency). Set core conductivity to 0 (leave core material density, stacking factor, stacking direction unchanged - as for real core material).

Using eddy effect can give unrealistic results when done unwisely. Use eddy effect calculations only when you are considering induced losses in solid elements (tank, tank cover etc).. Applying it to windings or core (full scale model) would need very detailed design.

Shantanav

Thanks Gerbi for your response. Ok, I will shut down the settings for eddy-currents and concentrate only on the core loss settings.

So, I purchased this transformer from the manufacturer and at present I do not have the specified P (W/kg) vrs B (T). What I do have is a curve for Magnetizing inductance (Lm) VRS. Magnetizing current (Im).

Can that be helpful ?

SirAskalot

What is the purposes of your simulation? How accurate loss calculations do you need?
Hysteresis curve don't do you any good in accurate calculation of core losses. But hysteresis losses (part of core losses) are proportional to the area under the hysteresis curve.

P(T) curves at 50/60 Hz you can find at many electrical steel manufacturers. E.g sura.se

Also, since you got the transformer, you can do some measurements and find the core losses.

kovibb

Hi all

Please can you tell me how can I create equivalent circuit in MAXWELL 3D in version 15? Specially,where is "export matrix to look-up table using Equivalent Circuit Extractor" menu?

Thank you for our reply

Shantanav

Hello Gerbi,

Thanks for your suggestion. Yes, I followed your steps. Actually, I created a new material. Firstly, I got a BH curve for hot-rolled low-carbon steel from the Sawhney machine design book and incorporated that into the material (since my transformer's material is hot-rolled low-carbon steel). Next up, I got the P (W/kg) versus B (T) for that material from the same book and incorporated it as well. I set the material density, bulk conductivity etc to optimum values.

The transformer model now simulates and gives correct results.

Thanks,
Shantanav

Shantanav

Hello Sir Askalot,

Purpose of my simulation - Trying to simulate the transformer under healthy condition and get current waveforms as close as possible to my actual lab-transformer. So, I am trying to model the core as similar as possible to the actual specimen I have.

Yes, I incorporated the P versus B curve for my core material and the model simulates now.

Shantanav

firdausa

hello guys,
i want to model a switched reluctance motor in ansoft maxwell with double layered winding, but i am not being able to find the option for layers of winding. please help me with a solution for it if anyone is dealing with switched reluctance motor in ansoft maxwell.


thanks
Firdausa