Getting Started with Maxwell 3D (ANSOFT)

[Fuxue Jin]

The current is correct.

You can plot input current vs time to verify it is sine wave. Loss is not sine wave, you need take average value on the loss vs time curve. Make sure you plot solidloss if your copper is solid.

Fuxue :


i want to insert a variable like that but i don't know Is it true or false?

Current1= 400*sin(2*pi*2000*time)


i inserted this variable in Winding part but when i make analyses i didnt see any sinusoidal figure on the Loss map. So is it a true or false situation for me? I saw just the same things when i inserted the dc current. There was nothing unchanged.

I wonder Current1 variable is true or not inserted.

 

[emredemir]

Fuxue i create coil by polyline is it solid or not? i inserted the solid winding current so that it is true? furthermore i see losses from ''Create Transient REport'' part on Results,arent i? So i want to send some you some picture of my project . may be you can understand easily i hope. but i don't have i send photos you from this forum


İn Addition Do you know What is the ohmic loss and What Do we doo in Field overlays?

 

[Fuxue Jin]

Polyline is a line, not sure how you create a coil with that. Anyway, a coil needs to be a 3D object with volume.

Yes, you will be able to plot a rectangular plot for loss vs time in "Create Transient Report".

Ohmic loss only appears in calculator, I think. That is the I^2R loss in a conductive object.

Field overlay allows you to create B or J filed on certain plane.

You need to be a little patience to learn the basic. Maxwell is not a car you jump into drive, but it's an aircraft.

Fuxue i create coil by polyline is it solid or not? i inserted the solid winding current so that it is true? furthermore i see losses from ''Create Transient REport'' part on Results,arent i? So i want to send some you some picture of my project . may be you can understand easily i hope. but i don't have i send photos you from this forum


İn Addition Do you know What is the ohmic loss and What Do we doo in Field overlays?

 

[emredemir]

hello Fuxue:

i m annoyed to you again so thet i have some problems. firstly i want to calculate a power. this power is on a coil. but there is no excitation. two line is coupled with this coil and so excitations were given by this lines. for example one of these have 540 A AC and the other one is the same which inductively effects coil and make up current and a power on coil. So my teacher wants from me to calculate power and current on this coil. Is it impossible or not?

 

[Fuxue Jin]

In Maxwell, excitation is applied to an area which is a 2D object. Excitation cannot be on a line.

Calculate power is possible depending on how complicate your model will be.

Take a screen shot of your model and post it here. Let's take a look at your model.

hello Fuxue:

i m annoyed to you again so thet i have some problems. firstly i want to calculate a power. this power is on a coil. but there is no excitation. two line is coupled with this coil and so excitations were given by this lines. for example one of these have 540 A AC and the other one is the same which inductively effects coil and make up current and a power on coil. So my teacher wants from me to calculate power and current on this coil. Is it impossible or not?

 

[emredemir]

This is my model and you may not understand there is two line which have current excitations and they are colored grey (iron). also red one is ferrit model and brown one is coil ( copper). my work is give the lines current excitation and calculate the current and power on coil. This is possible?

http://https://www.physicsforums.com/attachment.php?attachmentid=47762&stc=1&d=1338311715

 

[Fuxue Jin]

I am not sure how much you understand about a transformer. Just by looking at the model, a few questions here;

You have an E core, but only half. Normal transformer need two E cores mating together to close the magnetic path without gap. Only half E core means a huge air gap.

You have orange color coil around center core leg, which is good. But that is what we have been talking about so much previously. This coil may represent a multi-winding turns which you cannot use for solid power loss simulation.

Two grey wires in the model are strange, totally wrong to me. You never have a transformer made that way.

There is another mistake. You don't have region defined, so that is the reason you have those error messages.

I am really sorry but I have to say, based on these, you don't have good understanding about transformer and Maxwell. Your assignment may be over your capability and you need much more time to get the basic.

This is my model and you may not understand there is two line which have current excitations and they are colored grey (iron). also red one is ferrit model and brown one is coil ( copper). my work is give the lines current excitation and calculate the current and power on coil. This is possible?

http://https://www.physicsforums.com/attachment.php?attachmentid=47762&stc=1&d=1338311715

 

[emredemir]

Fuxue i erased the region when i attached the photo. i now transformer model but i use different type of this. i want to show you real image of model. may be you can understand simply. but i want to ask you can i draw this iron tracks by cylinder? also how can i calculate power on coil? and how can i see the current and voltaj on this coil? the current which on these tracs coupling with coil and generate current on this coil. are you understand what i say? also you can easily say me what i done wrong . it is not important for me. :)

 

[Fuxue Jin]

In the picture, I don't see coils on the core center leg. Do you have windings on the center leg?

I assume those two black long bars are what you called "iron tracks". If so, yes, you can drawing them by cylinder and assign voltage or current to them. And then obtain power loss in Maxwell.

Fuxue i erased the region when i attached the photo. i now transformer model but i use different type of this. i want to show you real image of model. may be you can understand simply. but i want to ask you can i draw this iron tracks by cylinder? also how can i calculate power on coil? and how can i see the current and voltaj on this coil? the current which on these tracs coupling with coil and generate current on this coil. are you understand what i say? also you can easily say me what i done wrong . it is not important for me. :)

 

[emredemir]

fuxue i draw new things and i send you now. but which analyses type do you suggest me? transient or magnetostatic? in addition iin transient analyses: do i give these tracks coil terminal and define winding on this tracs ? also winding you say on coil is excitation one or mean turn which one i didnt understand. and finaly haw can we calculate power on this coil:)

 

[emredemir]

Fuxue ;

i have already calculated the induced current on coil but i want to calculate power on this coil now. do you know anything else ?*

 

[Fuxue Jin]

You need go to Results, then plot loss vs time.

Fuxue ;

i have already calculated the induced current on coil but i want to calculate power on this coil now. do you know anything else ?*

 

[emredemir]

hi fuxue:

i want to ask you that. how can we solve this error do you know?
error: object 'part 1' and 'box1' intersect.

Do you know anythin about this.? in addition i import the file on this project. may be it caused this error or not?

 

[Fuxue Jin]

As the message says, two objects intersect each other. They cannot overlap.

hi fuxue:

i want to ask you that. how can we solve this error do you know?
error: object 'part 1' and 'box1' intersect.

Do you know anythin about this.? in addition i import the file on this project. may be it caused this error or not?

 

[emredemir]

thanks fuxue;

but i have a new error but this is killl me

ERROR: unable to create simulation working directory within temp dir:...

Do you know anything about thet.??

 

[Petr McDuck]

Hello,

is there anybody who know how to change the default value of stator winding conductivity (resistivity) in RMxprt design in case of 3 phase induction motor...?
As I know the default material of winding is copper...but i need to change it...

Thank you very much for you reply,

Petr

 

[pourmoosa]

Dear all
I am Working with Maxwell 3d, to simulate Linear induction motor,my email is aliasgharpourmoosa@gmail.com
When setting up a transient solver problem in Maxwell 3D, the following error occurred when running the simulation:

"Could not find the face. There might be an isolated hole in the band"

Does anyone know what this means? When I use the magnetostatic solver the simulation runs fine.
sorry for my English
Thank you
Ali

 

[GenB]

Hi, I'm trying to learn the basics of this program (V13) and haven't had luck with the user's guide. Can anyone explain how I might model the magnetic field of a wire with a current of 1 A in Maxwell 3D? It would be greatly appreciated!

 

[msorensen]

hello
I want to simulate an electric motor. I have one broken down and I know what they look like individual parts. It is important to perform simulation of the Maxwell 3D, not the "Rmxprt" because I have a lot of ideas for different rotor designs, and I sketched them in 3D. For three months I look through the documentation and tutorials with ansoft. In no case is similar to the embodiments of my model.
I need your help.
It shows in the Annex, where is my problem:
http://www.scribd.com/doc/102721866/2012-0810-2340

Generally, I know that I need to simulate: magnetic-transient or transient Electric. I suspect that the two simulations to connect in some way. Maybe someone will tell me if I'm wrong?

In the case of transient simulation Electric-like state on the ends of the coil voltage. The input impedance and resistance is needed. Where can I calculate this data? I can generally count on a paper but I doubt that all engineers as the problem in this way.

Does anyone have any suggestions on how to start the simulation?
Regards.
Sorensen

 

[annalisemalta]

Hi,

I am using Maxwell 13 and I am trying to simulating a 3 phase 4 pole permanent magnet machine, so far I have managed to get reasonable results however I am still not sure about certain things.

#1 problem that I have is that I managed to excite the winding with a 3 phase current input however I am getting results that do not make sens when I tried to excite the winding with a 3 phase voltage input.

#2 another question that I have is how to determine weather the machine is extracting or absorbing power? ie what is the software's conventional equivalent circuit of a generator/ motor?

Thanks a lot
Annalise

 

[Fuxue Jin]

For the voltage excitation, you need input the coil resistance. The simulation will not model the resistance if the conductor coil is specified as stranded.

Hi,

I am using Maxwell 13 and I am trying to simulating a 3 phase 4 pole permanent magnet machine, so far I have managed to get reasonable results however I am still not sure about certain things.

#1 problem that I have is that I managed to excite the winding with a 3 phase current input however I am getting results that do not make sens when I tried to excite the winding with a 3 phase voltage input.

#2 another question that I have is how to determine weather the machine is extracting or absorbing power? ie what is the software's conventional equivalent circuit of a generator/ motor?

Thanks a lot
Annalise

 

[annalisemalta]

Hi,

i did fill the coils resistance and inductance, and the voltage as a sin input with each phase shifted by 120 degrees... However the current waveforms include kind of a DC offset and I got two of the phases shifted upward and another one shifted downwards. I tried to invert the excitation of the winding shifted downwards to at least get the same DC shift in all the phases but did not work out as well...

I thought maybe I need to set other parameters that maybe are disabled when the coils are excited with current...

 

[gerbi]

Hello
annalisemalta, this phenomena You are observing is transient state in electromagnetic circuit.
This is pretty similar to inrush current in transformer. Voltage and flux waves in core are shifted by 90 deg. Now imagine what happends when You switch on voltage. If voltage waveform isn't at it's peak (flux is then at zero crossing - current too) current will have some disorder component in it. It will decline in time with some time constant, and only main component of waveform will remain.

You can check if it's true - just set up voltage excitation in one phase to be at it's peak in t=0 (other phases shifted +/- 120deg).

 

[annalisemalta]

Yes there is kind of a transient but even after almost 0.5s the waveforms are very far away from a normal 3 phase without a dc shift. I attached my current results for the time I simulated

 

[gerbi]

Rearrange excitation like I said. See if it helps or not. If not.. maybe try with external circuit from Maxwell Circuit Editor ? There are some more possibilities with it.

 

[eddyrooney87]

Hi everyone,

Need you guys help with Ansoft Maxwell 13. I am currently working on electromagnetic linear actuator as a vehicle suspension system. My design should look like below:
_____
| s |
| h |_____ ____ ______
| a | N | | C | | S |
| f |_____| |___| |_____|
| t |

It will be in cylindrical shape. Hope you understand.
N = north pole (magnet material, Neodymium)
S = south pole
C = coil winding

I already design the geometry in Ansoft. But I do have some question related to Maxwell:

1. How to assign magnetic pole (N/S) to my design.
2. How to assign coil polarity during current excitation.
3. Can we create external force to excite the shaft downward or upward?
4. What type of solver should be used for this kind of design?

Sorry for my english. Appreciate your help.
Eddy

 

[gerbi]

1. How to assign magnetic pole (N/S) to my design.
2. How to assign coil polarity during current excitation.
3. Can we create external force to excite the shaft downward or upward?
4. What type of solver should be used for this kind of design?

Ad. 1: Assign material (permeant magnet) to object. In it's properties You can select how magnetic coercivity vector is oriented
Ad. 2: by altering current direction. Coil polarity depends on direction of current
Ad. 3: Yes, there is such a posibility (assigning a band with mechanical transient)
Ad. 4: Transient (Magnetic)

One more thing, I suggest reading some tutorials and searching Maxwell On-Line Help for vital information about preparing simulation. If You do not have tutorials write me a PM with your e-mail adress and I will send them.

 

[annalisemalta]

gerbi,

is it possible to send me some tutorials on annalisexuereb@gmail.com

Thanks
Annalise

 

[Fuxue Jin]

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.

Hi,

i did fill the coils resistance and inductance, and the voltage as a sin input with each phase shifted by 120 degrees... However the current waveforms include kind of a DC offset and I got two of the phases shifted upward and another one shifted downwards. I tried to invert the excitation of the winding shifted downwards to at least get the same DC shift in all the phases but did not work out as well...

I thought maybe I need to set other parameters that maybe are disabled when the coils are excited with current...

 

[eddyrooney87]

Hi gerbi,

Ad. 1: Assign material (permeant magnet) to object. In it's properties You can select how magnetic coercivity vector is oriented

It is we change the magnitude value to negative(-)/positive(+). Not really understand what you are suggesting.

Ad. 3: Yes, there is such a posibility (assigning a band with mechanical transient)

I did try to assign the shaft as a band but error come out. "Invalid object selected for band. No objects within the band". How could I assign the shaft in mechanical transient?

Appreciate if you could share with me some tutorials for Maxwell 3D for my reference. Please send to dey_ad@yahoo.com.