how much motor cogging is OK?

To use a motor for a servo, how much cogging is OK? My motor definitely has
some cogging, it can be felt while rotating the shaft by hand. It hasn't
been driven slow enough to see if this affects its rotation.

As a figure of merit, is something like the cogging torque/moment of
intertia reasonable?

thanks for any help here, I'll be sure to share what is learned.

regards-
Elliot



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