Maxwell 3D (ANSOFT)

gerbi

Hi

in EC solver only linear permeability is allowed. In Transient solver You can use linear, non-linear, anisotropic (x-y-z) permeabilities.

emredemir

hello everyone ;


i vant to solve that power on coil and with transient or magnetic analyses.
i dont know have i calculate the power or resistance on coil???

please help me;

regards....

gerbi

Hi

What power you want to calculate ? Real power ?

Rethink this: is there really a need to use Maxwell to calculate power or resistance of coil ?
Maybe it's faster to use conventional methods ?

emredemir

There is realy need for calculate power and thats a real power. My teacher said me to solved this coil on maxwell and calculate power. Do you know anything about this topic. Calculate power is exist in maxwell or not? i realy dont find anything.

gerbi

It can be done in transient solver.

Solve it in Maxwell, go to results and plot the current and voltage to see if it works properly. There is also possibility to plot real power losses in transient. As always, it's good to check this values by doing some hand calculations.

emredemir

so you said that i could solve this by transient analyses , isn't it? but i dont know how i pointed the voltage and current on graph? can i find it in solution data link?

Fuxue Jin

There are two types of Copper loss in Maxwell. This is also called ohmic loss.

StrandedLoss: This assumes the conduction path is stranded with multi-wires, so the current density is uniformly distributed. The copper loss is simply I^2 R. This power loss should be the same as you calculated by hand if you can calculate the R for that conduction path. There is no benefit to use Maxwell unless the conduction path is very complicate.

SolidLoss: This assumes the conduction path is solid and with non-uniform current density distribution such as eddy current effect when in high frequency range. This is the case that you want to use Maxwell to obtain the copper loss.

emredemir

Hi Fuxuje;

so you said that stranded , solid and core losses are avaible for me. i want to calculate power loss on coil so stranded loss is the same mean with this loss or isnt it? also i have an error on maxwell '': Unexpected program error:Please contact Ansoft LLC.Code(1000)'' what does it mean fuxuje . do you know?

Fuxue Jin

Power loss is available, however, core loss is far away from accurate. The core loss is not from BH curve, but calculated based on flux density and frequency. You need define the core loss data set in the material property before you can do core loss.

strandedloss may be good enough for most cases, but it is really up to the problem you want to solve. If you want to consider eddy effect in the winding, then you have to use solidloss, which may not be possible in certain cases due to the 3D model may be to complicate.

I don't know the error code. If you don't have any error when do some other simulations, then it may be due to the model you have.

emredemir

but i didnt see where power loss was measure. only i saw stranded ,copper, core,strandedlossR links on Loss part in maxwell. for example can i calculate a power loss on coil or on other material? i want to solve this.

gerbi

What materials do you have in your design ? Coil (copper) and core (iron) ? Any more elements ?

Assume zero conductivity of core material (iron). Only thing left is the copper. All the losses you will observe (stranded, solid) will be in copper.

EDIT:
The other method is using Maxwell calculator. There you can calculate losses in element you desire in whole time spectrum you have solved.

Integrate Ohmic-Loss in desired Volume and Time. The drawback of this method is that, you need to calculate ohmic losses in every time moment and process and plot it manually outside calculator (unless you have written a script to do the job).

Fuxue Jin

For a transformer or inductor, total power loss is the sum of copper loss of the windings and core loss. You need add them together.

Fuxue Jin

Gerbi, question to you. When plot loss vs time, what value should be taken, RMS or AVG? I noticed AVG value of strandedloss is more close to I^2R value calculated by hand.

emredemir

Gerbi;

i use vacuum for region, ferrite and copper. Thats my metarial for use in project.
but u say that maxwell calculator. Where is that. in solution data or results . firstly you say stranded loss is nearly assume power loss,isnt it? am i understand true?
but i want to solve power loss on coil and it made by copper originally. for you tell
when we calculate stranded loss also we measure the power loss on caoil. because you said that conductivity of iron very high.

emredemir

Fuxue;

i know that i saw a table stranden and copper losses on results from create report part. although i saw a graph like stable on 300 W. At 0. second it was 300 W and not
change any time,Fixed value and 300 W. Is it true solution for me?

Fuxue Jin

You need to make it clear. As I mentioned, normally power loss is the sum of copper loss of the windings and core loss. If you only want to know the power loss in copper, then it is either solidloss or strandedloss in Maxwell.

Right click on "Field Overlays", you will see a menu item "Calculator", where you will calculate many parameters, but it is not very intuitive.

For the core, if it is iron/steel, because its high conductivity, so there will be extra coreloss involved. Because you use ferrite, then it is not an issue especially if you don't want to include core loss in your project.

Fuxue Jin

I don't know what is your excitation, an AC current?

Copper loss plotted vs time is normally not linear if your excitation is AC, say sine wave. So you need take average value of that plot over full time range.

If you excitation is DC, then the loss will be a straight line.