1.2.2.3.2.3.3 The magnetic ring is damaged
The two main reasons for damaged magnetic rings are mechanical scratches and demagnetization. Scratches
are typically visible, and minor ones could be tolerated. Their effect on encoder performance can be
observed on the phase error curve. The resulting phase reserve should be more than 25%. On the other
hand, demagnetization can’t be observed visually or with a gaussmeter. Only the calibration procedure can
be used for diagnostics. Note that even a magnetic tip of the screwdriver can disrupt the magnetization
pattern.
Attention
general handling guidelines for magnetic rings
to prevent demagnetization.
In case of a ring damage, the phase error curve would have a unique error peak.
1.2.2.3.2.4 Encoder system diagnostic
This set of features allows to:
Check the distance between the chip and the magnetic ring
Detect axial runout of the encoder ring
Read error states directly from the encoder chip
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