Getting Started with Maxwell 3D (ANSOFT)

[Fuxue Jin]

For two objects rotating create two new coordinate system that pass through the C.M. of the rotating bodies and then add motion band for each body.

There is a special function in maxwell called pwl_periodic(ds1,time) that let's you define datasets, it's like a modulation for sine waves but maybe it can be used for rectangular waves.

Use the formula you mentioned above, and define the dataset "ds1". It cannot be a perfect rectangular wave form, you have to define a short period of time for rising and falling, such as 0.01s, depending on your frequency of the wave form. The dataset is more like, (0,0) (0.99,0) (1,1) (1.99,1) (2, 0)

 

[Fuxue Jin]

Hello every buddy.
I've modeled a linear induction motor in Maxwell3D. Selecting the "Translation Motion Type" in "Motion Setup", I face the following set of errors:
Maxwell3DDesign1 (Transient)
[error] Invalid moving objects. All moving objects inside band must form single connected region. (2:36:21 PM Nov 14, 2016)
[error] Motion setup (geometry) is not valid. (2:36:21 PM Nov 14, 2016)

These errors occur only in translation motion.
I'll be grateful if anyone helps me.

I don't have access to Maxwell and couldn't recall any details, but such kind of error sometimes indicates that due to the movement of your object, they are out of defined region. Try animation to see the movement, and see if all objects are still within the region after moving. I could be wrong though.

 

[gatopardos]

Use the formula you mentioned above, and define the dataset "ds1". It cannot be a perfect rectangular wave form, you have to define a short period of time for rising and falling, such as 0.01s, depending on your frequency of the wave form. The dataset is more like, (0,0) (0.99,0) (1,1) (1.99,1) (2, 0)

There isn't a perfect rectangular wave in nature either, the rise/fall time can be 0.00001 s or much less which is how I set it up.

 

[gatopardos]

I don't have access to Maxwell and couldn't recall any details, but such kind of error sometimes indicates that due to the movement of your object, they are out of defined region. Try animation to see the movement, and see if all objects are still within the region after moving. I could be wrong though.

This happens when you set multiple moving objects too.

 

[HamidMazaheri]

This happens when you set multiple moving objects too.

Could you please describe more. I have attached a view of my model to make it more clarified. In this model, for example when I set the motion setup type in "Rotation" around Y-axis, there are no faults. And I don't understand the meaning of the error: "[error] Invalid moving objects. All moving objects inside band must form single connected region". How can the all moving objects inside band form single connected region?

 

[gatopardos]

Could you please describe more. I have attached a view of my model to make it more clarified. In this model, for example when I set the motion setup type in "Rotation" around Y-axis, there are no faults. And I don't understand the meaning of the error: "[error] Invalid moving objects. All moving objects inside band must form single connected region". How can the all moving objects inside band form single connected region?

You have the purple rail inside another object and these are touching never have objects touching unless you define the boundaries , make it bigger so they don't touch. When you have two separate bodies in linear motion it gives the error you say, you must enclose these objects in a band and make a bigger band as moving band that encloses the band and moving objects. Otherwise make the moving region longer or the duration of the simulation shorter so the rail doesn't hit the band border.

 

[HamidMazaheri]

Thanks a lot. Seems that the problem is solved. I made a bigger band that enclosed the former and assigned the bigger one as the moving band.

 

[HamidMazaheri]

Hello again
I just want to calculate the inductance of coils in my model (as I mentioned earlier in this topic, the model is a linear induction motor). I created a rectangular plot in "Maxwell 3D>Results>Create Transient Report>Rectangular Plot" in "Winding" category to calculate the inductance of coils and mutual inductance between them. But the problem is after the simulation is over, there is no data and therefore nothing is plotted. Should I change the solution type in order to let Maxwell to calculate the inductance?

 

[gatopardos]

Yes charge the solution type to magnetostiatic also you must add the coils to the parametric values in order for maxwell to calculate the inductance e.t.c. Go to parameters->assign>matrix to do that.

 

[vishwas grover]

please

based on my knowledge there is another method; that is using calculator but for getting this you go through maxwell guide that has complete how to use calculator explanation

please do help me for this

 

[matija123]

Hi, can anyone tell me how to create hysteressis loop?

 

[Fuxue Jin]

Hi, can anyone tell me how to create hysteressis loop?

In Maxwell, for soft ferrite, you cannot use BH loop in maxwell. You need define the BH curve using the simple relation B = uH, starting from 0,0. The curve (or the date set) only reside at the first quarter, positive X-Y.

 

[kaju]

hello all,
i got error

Maxwell3DDesign1 (Transient)
[error] Illegal external terminal 'CoilTerminal1': An external terminal must border the edge of the problem region and coincides with the surface of a 3D object.
[error] Illegal external terminal 'CoilTerminal2': An external terminal must border the edge of the problem region and coincides with the surface of a 3D object.
please give me solution

 

[gerbi]

Your coil end terminal must be on the border of analyzed region - it must be on the face of your 'region' box.

 

[kaju]

can u please give me a exact solution ?
beacuse i don't get it .

 

[gerbi]

Your object (motor, generator no matter what) must be contained inside of a 'region'. This is usually a box - 3D object with 6 faces. Your coil terminals are assigned do two faces of your coil object - at the both ends. So.. faces, to which you assign coil terminals must be on the faces of your 'region'. Not inside, not outside.. just on them, at the same surface.

In other words: modify your geometry so coil end terminals would be on 'region' surface.

 

[kaju]

this is my object

 

[Fuxue Jin]

this is my object

The surface on your 3D objecct that you apply current must be flush (in another word, must be on the same plane ) with the region boundary surface. The terminal surface cannot be contained inside the region.

In your case, you may have to extrude your terminal surface out to get to the boundary. Many cases, 3D model in Maxwell could not be the exact same as real mechanical model. If you believe making such a change will impact your final result, you have to rearrange your model or your region to fulfill the requirement mentioned above.

Current must be coming from outside the region and then going out the region. You cannot have current source included inside the region.

 

[matija123]

Hi, can someone please show to me, or explain to me how to create excitations for 24 slots stator, 3-phase, 4-pole or 2-pole, which coil to choose, how to set up coil terminals properly for 3-phase windings etc...?

 

[Fuxue Jin]

Hi, can someone please show to me, or explain to me how to create excitations for 24 slots stator, 3-phase, 4-pole or 2-pole, which coil to choose, how to set up coil terminals properly for 3-phase windings etc...?

I am sorry but the question you asked is way beyond the scope of this thread. It will be as long as writing a book.

 

[matija123]

just sitting in front of computer and trying solutions solves all problems, try it, it`s awesome ;)

 

[Izaz Ali Shha]

Royerconverter - inductive coupling of to aircoils

hi guys!

i try to calculate the efficiency of a Royer converter with two air coils (wireless power transfer) and the effects of steal or iron near to the coils. I have got a transmission frequency of 100 khz.

Which solver is the right? Magnetostaic or Eddy Current? (without steal, the coupling coefficient is nearly the same, but with a steal core it is half that.)

are the core losses included in the calculated inductive coupling coefficient?

what is your mean of gotting frequency 100 Khz?

 

[pisoj]

Hi,
I need help with coil simulation in Ansys Maxwell. I posted picture of my coil at the end of post.

• Anyway, i drew a coil as a User defined primitive polygon helix with N turns and added straight coil part after that.
• I assigned current to ends of my coil, and made current as stranded. One current goes in, other goes out.
• Drew a box around my coil, so my coil ends are on a surface of a box.
• assigned materials to coil (copper) and box (vacuum)
• clicked on Analysis and selected Add Solution Setup and clicked ok ( didnt changed anything in there)
• i validated coil and it all went ok
• after analyzing all, i think my simulation results are wrong

I tried to plot H and B as vectors, but i only got few arrows pointing from the coil on top(and they are on a coil surface only. il post it if you want or need to see what's wrong.
Any help would be appreciated as i don't know what am i doing wrong, and i don't have much experience with Maxwell, but i am eager to learn.
http://imgur.com/a/1L2si
http://imgur.com/a/6rQkH

 

[Izaz Ali Shha]

i think your every thing is ok you can increase or decrease the number of arrows...click on the field go to modified attribute where you can change thus check there every thing and see your H and B field vectors...

 

[pisoj]

Hello, thanks for answering so quickly. I tried to increase number of vectors earlier. ' d like to get full path of vectors around the coil, if you know what i mean.

I can try to post picture of what i would like to get with simulation when i get on my pc.
I could send you my model if you have time and will to spare to check it.

i think your every thing is ok you can increase or decrease the number of arrows...click on the field go to modified attribute where you can change thus check there every thing and see your H and B field vectors...

 

[Izaz Ali Shha]

ya i will try but now i am busy in making some presentation after that i will contact you.thanks

 

[pisoj]

ya i will try but now i am busy in making some presentation after that i will contact you.thanks

Thanks a lot for your effort.
I'l try to simulate it further and look for help and clues around.

Also i will post updates on simulation status, and once it is completed i will post whole procces if someon is intetested in it.

 

[pisoj]

I am finished with my magnetostatic coil simulation. I'll post it if anyone is interested, along with whole procedure.

 

[Izaz Ali Shha]

Have you solved that problem?? if not, then message me i will help you..sorry for being late

 

[pisoj]

Have you solved that problem?? if not, then message me i will help you..sorry for being late

I solved it. As i am new in Maxwell, i selected only my coil for plotting field, so naturally vectors in region around it were not visible.

But i have few questions i'd like to ask you.

1. What is the difference between Solid or Stranded option for current in Maxwell ? I assumen the difference would be visible only if working in AC field with high enough frequency.

2. I tried assigning current as a matrix in Parameters section. And if i am remembering correctly, results were the same as without assigning it in parameters section. What is the use of this assigning it through matrix?

3. If i want to do same experiment with AC current(to be more precise, i want to simulate non hompgenic fields) which solver is the best to choose from? Eddy current or?

Thanks in advance.