The inherent disadvantage of the stepper motor is its high vibration and noise when it rotates at low speed.
A. If the stepper motor works in the resonance region, the resonance region can be avoided by changing the reduction ratio and other mechanical transmission.
B. uses a driver with subdivision function, which is the most common and easiest way.
C. is replaced by stepper motor with smaller step angle, such as three-phase or five phase stepper motor.
D. is replaced by AC servo motor, which can almost completely overcome vibration and noise, but the cost is high.
E. has added magnetic dampers on the motor shaft, which has been used in the market, but the mechanical structure has changed greatly.