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Compressed and Extended Spring detection with LDC

 

Dear Technical Support Team,

 

Following calculation tool shows how to calculate L for Spring.

It doesn't include wire diameter. It doesn't affect L calculation, does it?

http://www.ti.com/jp/lit/zip/slyc137

Best Regards,

y.i

  • Hi Y.I,
    the calculation is an approximated model, but it is typically accurate enough for inductive sensing applications. Note that the purpose of the equation above is to find out if a certain spring can be used, and to approximate the % inductance change. More accurate models to varying degrees of complexity and accuracy are available online.

    There are several terms that the above equation neglects (wire thickness, oscillation frequency, length/diameter ratio), but the effect is typically very small for most springs compared to changes in diameter, number of turns, or length.
  • Hi,

    Thank you for your reply.

    >More accurate models to varying degrees of complexity and accuracy are available online.

    ⇒Does it mean WEBENCH Coil Designer?

        It seems that it doesn't includes spring on Select Coil Type.

        Can I use Circular instead of Spring like following?

        But at first , I'd like to use a spring calculation on excell.

    Best Regards,

    y.i

  • Hi Y.I,
    Webench does not currently support springs.
    Our calculator spreadsheet has a tab on springs with the equation above: www.ti.com/.../slyc137