Is rotary encoder also unique mechanically?！

Is rotary encoder also unique mechanically?

Yes, the rotary Electric Encoder high accuracy is exceptionally unaffected by shaft
eccentricity and tilt, as in high accuracy optical encoders, and therefore needs no
bearing of its own for aligning the rotor relative to the stator, as a result it is directly
mountable on the host shaft. The absence of internal bearings not only makes its profilelow, but also obviates the need for a flexible shaft coupler, or flexible stator mounting,
as a result the electric encoder provides both accuracy and compactness

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