Note that the stepper motor is used in low-speed occasions–the speed per minute does not exceed 1000r/min, and the best working range is 150~500r/min, (closed-loop step can reach 1500). The 2-phase stepping motor is prone to low-speed resonance at 60~70r/min, resulting in vibration and noise, which needs to be avoided by changing the reduction ratio, increasing the number of subdivisions, and adding magnetic dampers. Precautions for subdivision accuracy, when the subdivision level is greater than 4, the accuracy of the step angle cannot be guaranteed, and the accuracy requirements are high. It is best to use a stepper motor with more phases (ie, a smaller step angle) or a closed-loop stepping ,servo motor.