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Original question:

DRV5056-Q1: Head on linear measurement

DRV5056-Q1: Unipolar sensor constraints/errors?

Prathmesh Kulkarni
Prodigy 160 points
Part Number: DRV5056-Q1
Other Parts Discussed in Thread: DRV5056

Hi,

I would like to know will the sensor transmit constant output while the magnet is rotating at d1 and d2 distance? (as shown in below figure)
Will there be any added error in output voltage? Are there any constraints during magnet rotation for the sensor IC?

  • 0
    TI__Genius 16640 points

    Prathmesh,

    Thanks for reaching out.  In the ideal case for this scenario, the field strength will remain constant during rotation due to radial symmetry.  You may find that due to mechanical tolerances that there could be some run-out where the magnet is not perfectly centered with the rotating shaft or tilt.  These errors could cause the z-component of the field to vary slightly as the magnet rotates and result with minor fluctuations in output.

    As long as as your magnet does not saturate the input of DRV5056 and there is a strong enough field to measure, this configuration should be fine.  It is noteworthy that the field from the magnet is inversely proportional to the square of the distance, so there will be exponential decay in field strength as the magnet moves further from the sensor.  

    Thanks,

    Scott