• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 30 subscribers
  • Views 412 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Designing my own PCB coil without Webench.

Laurentino Casado
Prodigy 20 points

Hi. I'm trying to design a coil to detect steel from 6 to 10 cm of distance. The webench only allows achieve 7 cm. I have read in other post that the distance is similar to external diam. If I design my own coil, how can I know the measure precision , the diameter of target, and the distance?

To determine the inductance I use this article.

25510a_new_calculation_for_designing_multilayer_planar_spiral_inductors_pdf.pdf

Thanks in advance.

Tino Casado

Oberon Sistemas S.L

  • 0
    TI__Expert 4890 points

    Hi,

    You can refer to:

    Q1: What is the maximum target sensing distance for the LDC1000?

    A1: The rule of thumb is

    • for high sensing resolution, a target with a size comparable to the size of the coil can be sensed at a distance of up to half of the coil diameter
    • for presence detection , a target with a size comparable to the size of the coil can be sensed at a distance of up to the coil diameter

    So we can konw the diameter will relate to sensing distance and precision, can you tell me what kind of accuracy you want to reach? Or you just used for presence detection?

    Regards, Sunny

  • 0 in reply to Sunny Qin
    Prodigy 20 points

    Hi Sunny,

    In this case  the accuracy needed is around 1 mm.

    Another possibility to improve the distance reached is use a ferrite in the spiral's axis?.

    Do you know the range of this improvement? and their accuracy influence?

    Regards, Tino.

  • 0 in reply to Laurentino Casado
    TI__Expert 4890 points

    Hi,

    Yes, LDC1000 can reach your goal, both the range and the accuracy.

    PCB coil and ferrite are OK, ferrite can detect 70% of coil diameter, which is better than PCB coil, we know PCB coil can detect 50% of coil diameter.

    Regards, Sunny.