How do I model a Saturable Core Inductor in Multisim?

[ashifulk]

Hello, I am looking to model a saturable core inductor/coil in Multisim. I want to apply a changing voltage which will eventually cause the core to saturate.

I also need to simulate magnetic field lines. Is there a way do that as well?

Thank You.

[Tayyab_R]

Hi,

We have an example in Version 12 in the Samples Folder which shows the operation of a Saturable Transformer. It is in the Power Conversion >> DC-DC folder and is called  "ForwardConverterSaturableTransformer". This example should guide you on how you can accomplish this.

We also have a "NON_IDEAL_INDUCTOR" component in the Basic Group >> NON_IDEAL_RLC Family which can be configured to change based on the current etc through it. 

Hope this helps.

[ashifulk]

I know this does relate to my original question but is there a way I can introduce external magnetic fields in a circuit in Multisim? Also, could you give me a little more information on the magnetic core component works in Multisim? And also how to connect the coreless coil to the magnetic core.

Thank You.

[ashifulk]

I meant to say "I know this doesn't relate...", not "... does relate..." on my last post.

I also want to clarify my question about the magnetic core component. I want to know how are the parameters of the magnetic core used in calculation/analysis, for example how is the "Magnetic field co-ordinate" used? Also, how is the "Flux density co-ordinate" used? Also, what does the different coordinates represent? There are 1-15 fields for the last two fields I mentioned. Also, does the core saturate given enough current?

Thank You.

[Tayyab_R]

Hi,

I have attached a simple example of how you would use the magnetic core with the coreless inductor. In essence, the coreless inductor needs a current source which it then interprets into voltage based on number of turns. The magnetic core then treats this voltage as mmf(magnetomotive force). In the magnetic core, you can configure H (Magnetic Field Intesity) and B (Flux Density). The equations for these are

H = mmf/L where L is Length

B = f(H)

The value of B is based on H and the relationship is linear based on the co-ordinates entered in the value tab of the Magnetic Core.

Hope this helps.

[ashifulk]

Thank you for the reply. How are the values of the co-ordinates entered in the value tab of the Magnetic Core used to calculate B? I can not figure out the relationship; I would like to know this relationship to better understand the component and what the expected output value of the core should be. Also, what does the co-ordinates represent? There are a lot of different values that can be entered and I'm not sure what the different co-ordinates values represent or do.