situ pisze: jest 1/2 kroku jak napęd pracuje bardzo powoli to jest straszny rezonans
bardzo typowy rezonans... tak mocno słyszalny bo mały podział kroku (1/2)
polecam kawałek o rezonansach... bardzo dobrze opisujący podstawowe zjawiska... i metody zwalczania...
Resonance
Stepper motors have a natural resonant frequency as a result of the motor being a spring-mass system. When the step rate equals the motor’s natural frequency, there may be an audible change in noise made by the motor, as well as an increase in vibration. The resonant point will vary with the application and load, but typically occurs somewhere between 70 and 120 steps per second. In severe cases the motor may lose steps at the resonant frequency. Changing the step rate is the simplest means of avoiding many problems related to resonance in a system. Also, half stepping or micro stepping usually reduces resonance problems. When accelerating to speed, the resonance zone should be passed through as quickly as possible.
u pana Jonesa jest nawet wyliczenie tej częstotliwości rezonansowej silnika...
http://www.cs.uiowa.edu/~jones/step/physics.html
f = ( k/µ )0.5 / 2π
It is crucial to note that it is the moment of inertia of the rotor plus any coupled load that matters. The moment of the rotor, in isolation, is irrelevant! Some motor data sheets include information on resonance, but if any load is coupled to the rotor, the resonant frequency will change!
In practice, this oscillation can cause significant problems when the stepping rate is anywhere near a resonant frequency of the system; the result frequently appears as random and uncontrollable motion.