Transient magnetics simulation error

Iñigo Izaguirre

Hello,

 

I am doing a core inductance model in flux (model attached). In this model I have simulate some harmonics in the electrical circuit and I have some problems to make the simulation works there. How should I make the circuit and the current source value definition? Is the first time I am doing a transient magnetics simulation so I dont know very well how to set up an appropiate solving scenario. I will upload the model if you want to take a look. I would be very grateful.

 

Thank you,

 

Iñigo Izaguirre 

Lavanya Vadamodala_20519

Hello Iñigo Izaguirre,

If you know the harmonics that are present in the input current, then you can give it as below in current source value :

V=V1*Sin(wt)+V2*Sin(2wt)+.......

Or if you have a table of input current data, then

- Create a parameter I/o defined as "Parameter defined by table of values"

- Then define the abscissa and ordinates as in below picture.

After creating the parameter, give this parameter as input to current source.

Let me know, if you have any questions.

Thank you,

Lavanya

 

Lavanya Vadamodala_20519

Lavanya Vadamodala_20519 said:

Hello Iñigo Izaguirre,

If you know the harmonics that are present in the input current, then you can give it as below in current source value :

V=V1*Sin(wt)+V2*Sin(2wt)+.......

Or if you have a table of input current data, then

- Create a parameter I/o defined as "Parameter defined by table of values"

- Then define the abscissa and ordinates as in below picture.

After creating the parameter, give this parameter as input to current source.

Let me know, if you have any questions.

Thank you,

Lavanya

 

You can use one current source and define its value as function of harmonics or table of data. No need to use multiple current sources.

Iñigo Izaguirre

Thank you for the tip. I have done one simulation but I dont know how can I compute the losses. I have tried to get them from joule effect but I think that is not correct. Where can I get detailed coil power losses?

Thank you,

 

Iñigo Izaguirre

Lavanya Vadamodala_20519

Iñigo Izaguirre said:

Thank you for the tip. I have done one simulation but I dont know how can I compute the losses. I have tried to get them from joule effect but I think that is not correct. Where can I get detailed coil power losses?

Thank you,

 

Iñigo Izaguirre

Hello Iñigo Izaguirre,

To compute Joule losses with harmonic current input, Flux will compute losses at each time step as (I_currentstep^2)*R.

Here R is resistance of coil conductor.

When you plot the joule losses, you will see the losses plotted along the time as below :

Can you explain why you think that it is not correct?

Thank you,

Lavanya

Iñigo Izaguirre

Hello,

Thank you for the answer. I didnt mean that is not correct. What I mean to say is that I thought that computing joule effect dont take into account additional losses produced by proximity and skin effect. Does joule effect computation consider aditional losses ?

 

Thank you,

Iñigo

Lavanya Vadamodala_20519

Iñigo Izaguirre said:

Hello,

Thank you for the answer. I didnt mean that is not correct. What I mean to say is that I thought that computing joule effect dont take into account additional losses produced by proximity and skin effect. Does joule effect computation consider aditional losses ?

 

Thank you,

Iñigo

Below are the cases in which losses due to skin and proximity effect are considered along with losses due to fundamental current :

1) When you have coil turns are fully described in the geometry and assigned Solid Conductor regions as shown below.

2)When you give a detailed description of the winding while creating the coil conductor region. 

In both cases, Flux applies the homogenization procedure and also accounts for the proximity and skin effects. 

You can find more details in the link below:

file:///C:/Program%20Files/Altair/2021.2/flux/Flux/Help/english/UserGuide/English/topics/CoilsInFluxMeshedCoilRegions.htm?hl=skin%2Cdepth%2Cproximity%2Ceffects

In the model, you have used non-meshed coils. For non-meshed coils, skin and proximity effects are not considered in Flux. You need to have meshed coils.

Thank you,

Lavanya