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LDC0851: How to design sensor to detect the rotation of a metal plate with small hole?

John11513
Expert 5720 points
Part Number: LDC0851
Other Parts Discussed in Thread: LDC1312

Hi,

My customer want to use LDC0851 to detect the rotation of a round stainless steel plate, there is a lot of small hole on it (diameter of the hole is 3mm). See attached for its detailed mechanical diagram

As my understanding, to make the device to respond to the small hole, the sensor's diameter should not larger than the hole. However, I found it is basically impossible to design such small coil with Webench to work with LDC0851. Do you have any idea to design sensor for this application?

Thank you!

制动盘.pdf

  • 0
    TI__Genius 17440 points

    Hi John,

    I believe the 3mm outer diameter is too restrictive to meet the minimum sensor inductance requirement for the LDC0851. Does your customer need to detect partial rotations or full rotations? If they do not need to detect small fractions of a full rotation, it looks like there are larger holes in the central area of the plate that would allow them to use larger sensors. If this is not possible, you should try the LDC1312, which can drive lower inductances than the LDC0851.

    I also recommend using the Inductive Sensing Design Calculator Tool, which can be found at the bottom of the Tools & Software tab of any LDC device product page.

    Regards,