Simulating a physical inductor by LTspice

[@Chris_Grossman]

I have to run a simulation soon with a saturated inductor and I was wondering how to do it. You answered that for me. Thank you.

[@sambenyaakov]

😊

[@joenova7945]

I didn't know how to do it either, thanks

[@vicentematricardi3596]

Mis Saludos y como siempre , agradecido por sus excelentes enseñanzas !!!!

[@sambenyaakov]

Gracias

[@byronwatkins2565]

A very clever strategy!

[@sambenyaakov]

Thanks

[@Chupacabras222]

Fascinating!

[@sambenyaakov]

Thanks. Feedback like yours keep me going.

[@idk2412]

Nicely presented, you make this very accessible! Though, I'm curious what are some drawbacks or assumption that are inherent using this method?

[@sambenyaakov]

Thanks. Deficiencies: no hysteresis, and hence losses effects, the approximate nature of the fitting, not taking into account secondary effects (fringing, copper losses etc.)

[@tseckwr3783]

thanks again for another very helpful video

[@sambenyaakov]

Thanks

[@wickedprotos1937]

Thank you!!!!

[@sambenyaakov]

Thanks.

[@billimew7496]

Another spectacular video from Prof Sam. I wish you a good health and blessing.
I have one question. lets say the current through inductor is ac. sufficiently high to reduce the permeability. does the inductance of an inductor changes with current.
just for simplicity i assume the relation of L=(100-I) uH. I provide a sine current of peak current of 50 A to this inductor. Will i get 100-mod(50A sin(omega*t)) uH inductance.

[@sambenyaakov]

Hi, indeed the inductance will change but you need to sort out to which inductance you are referring. See: Ben-Yaakov, Sam; Semidotskih, Yivgeni; Rozanov, Evgeny; Haag, Hemann; Hämmerle, Florian (2021). ‘Inductance’ definitions, modeling, and simulation. TechRxiv. Preprint. doi.org/10.36227/techrxiv.14975082.v1

[@power-max]

I've been wondering exactly about this for some time! Since I wanted to simulate circuits like Royer oscillator and joule thief's and such circuits myself for some time! Thank you!
Question: throughout your video, is 'n' the number of turns on the primary? A is the cross-sectional area of a core? I is the current? l is the length of the core? (damn why upper case I and lower case l must look the same smh) Is the assumption that the majority of the flux is constrained within the core? I have a hard time learning about magnetics because of all the different variables involved and keeping track of what is what.

[@sambenyaakov]

Thanks. You got all the definitions and these assumptions correct. Also, no core or copper losses and some other simplifying assumption. The model is meant for seeing first order effects. If you run a Royer oscillator, show us the details. Great nonlinear circuit.

[@wickedprotos1937]

lol on the i and l issue, in my first transforms class: I'm a very sloppy left hander, so my 5 and s(s output variable from a Laplace transform) look the same especially when I get tired. So my professors were cool and let me just underline my 's' and they knew this for me.

[@sambenyaakov]

@@wickedprotos1937 👍

[@RogueTuning]

In your video 'answer to inductor saturation riddle', the derivative of the inductance in saturation is >0.
Would the arctangent function better approximate this behavior instead of hyperbolic tangent?

[@sambenyaakov]

They are both approximate, about the same. For better fitting use Table

[@h7qvi]

Modelling hysteresis would be interesting

[@sambenyaakov]

In the making

[@justpaulo]

Great content as usual.
It would have been interesting to plot the voltage across L1. Presumably, if spice works well, it should match perfectly V(Ld) since i(t) = t and therefore di/dt=1 => V(L1) = L1*di/dt = L1 .
I guess I'll have to get my hands "dirty" and build such a simulation.... 😉

[@sambenyaakov]

If you do, please share.

[@justpaulo]

@@sambenyaakov Just did it, and V(L1) exactly matches V(Ld) as expected.

[@sambenyaakov]

@@justpaulo Great

[@avin6602]

Thanks! What about hysteresis, can it be introduced into the simulation?

[@sambenyaakov]

Thanks. Lt spice inductor model has a variant which include the hysteresis.

[@paulpaulzadeh6172]

Cloud you please make LT spice modell for Helmholtz Coils too, I use it as notch filter

[@sambenyaakov]

do you mean an electrical model of the impedance ? Is this for audio applications?

[@paulpaulzadeh6172]

​@@sambenyaakovyes , I use as filter for negative rail and positive rail voltage that it connected to the same transformer with two separate secondary output and separate rectifier for each and a coupled + /- on each rectifier to make zero reference for push pull output stage. Each coil then will be placed together to make notch filter , we can get very good ripple steering which I saw on one your video. In practice works well about 30dB attenuation by tuning in these two coils. I got the idea from ripple steering and this Helmholtz coil applications. But still now I can't make LTspice modell for it. Maybe you can help me Thanks a lot .

[@sambenyaakov]

@@paulpaulzadeh6172 Hi, as I know Helmholtz Coils are two circular coils put a part to generate a controlled magnetic flux. Is this what you are using???

[@paulpaulzadeh6172]

​@@sambenyaakovyes , the ripple for positive and negative, cancel each other , As two coil tune in each other

[@sambenyaakov]

@@paulpaulzadeh6172 Is there any published reference on that?

[@isacdaimary9908]

Sir what is the use of "Group delay" parameter in Bode plot in LTspice. Can I use it to find phase margin?

[@sambenyaakov]

Phase delay is a time domain parameter. Nothing to do with phase margin which is a frequency domain parameter.

[@tamaseduard5145]

👍🙏❤

[@sambenyaakov]

🙏😊👍

[@PavolFilek]

Hi prof. S: Ben-Yaakov, tell me, how to transfer all your knowledge to my brain ?

[@sambenyaakov]

Thanks. How about transferring some?😊Keep watching the videos. More to come .