The servo motor always has a deviation in position

The so-called digital quantity is actually just a digital circuit conversion inside, which is essentially voltage or current. The pulse type is actually a voltage signal, not a current signal. High frequency 1, low frequency 0. The voltage drop or rise in the process of voltage transmission caused by the wire will cause the receiver to be good in the process of converting to digital signal, so it is normal if the position is not reached and the speed is abnormal, This is also the reason why shielded wire is used for signal wire in actual use (excluding external voltage interference)