Why does the stepper motor operate normally at low speeds, but if it is higher than a certain speed, it cannot start and is accompanied by a howling noise?
The starting frequency should be lower. If the motor is to rotate at high speed, the pulse frequency should have an acceleration process, that is, the starting frequency is low, and then a certain acceleration to the desired high frequency (motor speed from low speed to high speed).
If the pulse frequency is higher than this value, the motor will not start properly and may lose step or block. In case of load
Stepper motor has a technical parameter: no-load start frequency, that is, step motor in the no-load case can start normal pulse frequency
