Stop Position Accuracy

It refers to the discrepancy between the theoretical and actual stop position of the motor.
This is the width between the maximum value in the (+) direction and the maximum value in the (-) direction when measuring 360˚ in 1 step at a time, starting from an arbitrary stop position of the rotor.
A stepper motor itself has an angular accuracy of within ±3 minutes (0.05˚) with no load condition. This small error is due to the mechanical accuracy of the stator and rotor, and the small resistance, variation, etc. of the stator winding.
However, in actual applications, there is always a frictional load. So angular accuracy is determined by the angle and torque characteristics, which results in angle variation according to the frictional load.