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'[EE] Reducing Stepper Motor Resonance'
2006\02\15@224608 by Aaron

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I made a stepper motor driver that takes step and direction signals and generates the neccessary signals to 1/10 microstep a bipolar motor.  Although I am microstepping, I still notice some resonance which is most pronounced around 5 revs/sec.  Any suggestions on things I could do electrically to reduce this resonance?  As a point of reference, my design seems works no better or no worse than a much more expensive product I acquired from Ebay and am attempting to replace.

I've done a bit of researching and found where one manufacturer says their drive won't resonate due to second order dampening.  They also state that they delay the microstep from the receipt of the step input for 4-50 us depending on motor speed, but I'm not sure if they do this by design or accident or if it is even related to reducing resonance.  Any thoughts?  

Comments appeciated. :)

Aaron

2006\02\16@001115 by David VanHorn

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I've not tried this, but you might be able to mix a little digitally
generated noise with the time interval for each step, so that they don't
reinforce so well.

2006\02\17@082735 by Vasile Surducan

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On 2/16/06, Aaron <spam_OUTaaron.piclistTakeThisOuTspamgmail.com> wrote:
> I made a stepper motor driver that takes step and direction signals and generates the neccessary signals to 1/10 microstep a bipolar motor.  Although I am microstepping, I still notice some resonance which is most pronounced around 5 revs/sec.  Any suggestions on things I could do electrically to reduce this resonance?  As a point of reference, my design seems works no better or no worse than a much more expensive product I acquired from Ebay and am attempting to replace.
>
> I've done a bit of researching and found where one manufacturer says their drive won't resonate due to second order dampening.

If you know the unwanted frequency resonance, the coil inductance,
then you may compute a LPF directly on the coils. I don't know what
means "second order dampening" but sounds something like that.

best,
Vasile

They also state that they delay the microstep from the receipt of the
step input for 4-50 us depending on motor speed, but I'm not sure if
they do this by design or accident or if it is even related to
reducing resonance.  Any thoughts?
>
> Comments appeciated. :)
>
> Aaron
> -

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