DocID023491 Rev 3

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AN4144

Tuning of the BEMF compensation parameters

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2.3.5

Step 5: final check

When all the values have been tuned and the optimal compensation is obtained, a final

check should be done. Performing a speed sweep the measured current amplitude must be

almost constant. According to the oscilloscope characteristics, some artifacts (Figure 14)

may be displayed when long time acquisitions are performed.

Figure 14. Final check acquisition showing artifacts

In order to avoid mistaking artifacts for real compensation errors, the following suggestions

should be considered:



If present, use the ZOOM function of the oscilloscope to magnify the critical areas

(Figure 15)



Split the acceleration into more parts.

Figure 15. Magnified acquisition verifies the presence of artifacts