Full rotation sensing with z-axis insensitivity

Thomas M.R.

In your LDC1000 application examples you show a full rotation sensor with z-axis insensitivity using 3 coils. Can you please explain how the z-axis compensation is done using the shown target geometry (I assume all 3 coils are on the same side of the target)

Regards

over 10 years ago

0 Natallia Holubeva1 over 10 years ago

TI__Expert 6550 points

Hello Thomas,

I apologize for the delay. From the target design below (orange == cupper), coils I and Q are meant for In Phase and Quadrature and are 90 degrees apart. Coil Z can be used for improved Z- Axis Correction (if you need to compensate for the hight variation).

Best Regards,

Natallia Holubeva

0 Thomas M.R. over 10 years ago in reply to Natallia Holubeva1

Prodigy 20 points

Hello Natallia,

thanks for the explanation. The usage of coil I and Q is clear for me. For coil Z I would expect a constant target. In your drawing it looks like the target for coil Z is wider on the right side than on the left side.

0 Natallia Holubeva1 over 10 years ago in reply to Thomas M.R.

TI__Expert 6550 points

Hello Thomas,

You are right indeed - Z coil is for constant target. I apologize for the mismatch in the drawing.

Best Regards,

Natallia Holubeva

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Full rotation sensing with z-axis insensitivity