ewb inductor

[adriangeana]

how design the inductor T1A,T2B,T3C (in EWB) from attach design ?

[lacy]

Before an answer can be given, I need to know which version you have. I have an idea that may or may not help, but it can only be done in Version 10.0.1.

[adriangeana]

How cupled multiple inductors ?

[adriangeana]

How cupled multiple inductors (in EWB) ?

Nobody know this problem ?

[lacy]

I am sorry no one has replied to your inquiry. It is not an easy thing to couple inductors in Multsim without creating a new part (at least I haven't found an easy way to do it). This part would be a Multi-winding transformer and can be done with the models makers in Version 10. If you are using an older version then I would not know how to do this.

What I can do is to try and create a part for you and post it to the forum for you to try. This may take a little time to do but I will give it a try.

Message Edited by lacy on 02-29-2008 08:01 PM

[adriangeana]

Yes. If you can do this it where great.

Thanks a lot. I will wait than.

[lacy]

I was unable to use my first idea about the models makers. Without the specifications of that transformer (primary voltages and secondary voltages) I could not do it the way I planned. What I did do was to create a generic transformer with a model I created that will be easy for you to edit to your particular transformer.

I have included instructions on the schematic on how to edit it. You will need to find the information on the transformer you are trying to model in order to edit this one to match it.

I hope this helps some as this is all I could come up with. The only other option is to goto the manuafacturer's website and see if they have a pre-made model for it that you can use to create a more accurate representationl of it.

[OStep]

Inductors are coupled using the "k" element. For example...

L1 1 0 1m
L2 2 0 2m
K1 L1 L2 0.99

You have two choices depending on which version of Multisim you have. Here are my recommendations:

If using V10.0.1, choose "Arbitrary SPICE Block" component from Basic->Basic_Virtual. Assuming the schematic references designators of the two inductors you are trying to couple are L1A and L1B (as per your attached picture) place the following lines into it the Arbitrary SPICE Block

K1 LL1A LL1B 0.99

where 0.99 is the coupling coefficient. Also notice the appending of the letter "L". The dot designator is located on pin1 of each inductor


If using an earlier version, as there's no Arbitrary SPICE Block component, you will have to make a subcircuit with the inductors and the coupling coefficient all inside. Use the component wizard to make a component using a model that looks something like:

.subckt myInductors in1 in2 out1 out2 
L1 in1 in2 1m
L2 out1 out2 4m
K1 L1 L2 0.8
.ends


The product will address the issue of coupling inductors on the schematic in the future.

[lacy]

Thanks Max, I forgot about the Spice Block (I haven't used it very much, if at all). That was some good information and very cool when I tired it. This would make it easier for the user to couple these coils and still be able to place them anywhere on the schematic instead of having them tied to a stationary transformer type symbol symbol.

Very nice. Thanks very much for your input on this it is greatly appreciated.

[adriangeana]

Iacy, thanks for the inductance !!

but i hawe yet two  question :

- where is the L1,L1,L3 in the diagram ?

- in EWB 5 it is possible to create the form from inductance (L1,L2,L3) ?

Adi