Create Variable Inductance in SPICE

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SUMMARY

This discussion focuses on creating a variable inductance, specifically a saturable inductor, in NI Multisim. Users can utilize a polynomial voltage-controlled current source in parallel with the inductor (L0) to achieve the desired inductance variation with current. Accurate coefficient settings are crucial for matching real inductors, necessitating measurement and curve fitting. Reference materials, such as the provided PDF, offer additional guidance on this topic.

PREREQUISITES
  • Familiarity with NI Multisim software
  • Understanding of inductance and its behavior under varying current
  • Knowledge of polynomial voltage-controlled current sources
  • Experience with curve fitting techniques for electrical components
NEXT STEPS
  • Research how to implement polynomial voltage-controlled current sources in NI Multisim
  • Study methods for measuring inductance and performing curve fitting
  • Explore the characteristics of saturable inductors and their applications
  • Review the provided PDF for detailed examples and explanations on inductor modeling
USEFUL FOR

Electronics engineers, circuit designers, and students interested in advanced SPICE simulations and inductor modeling techniques.

akhurash
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I'm trying to create a variable inductance in SPICE, specifically in NI Multisim. What I'm trying to do is create a saturable inductor. I need an inductor that changes it's inductance with current. Multisim does have a "virtual" inductor that you can create a inductance function with but I can't really get it to work and I used NI but their help isn't that great either.


Has any created a variable inductor or a saturable inductor in some sort of a SPICE program (or Multisim)?

Any help is greatly appreicated. Thanks!
 
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It's pretty easy. You just put a polynomial voltage controlled current source in parallel with the L0.

The trick is, what do you set the coefficients to. If you're trying to match an actual particular inductor, you're probably going to have to measure and curve fit it.

See page 2 of this PDF.
http://www.intusoft.com/articles/inductor.pdf
 

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