Re: Stepper Motor Resonance ?

[John Sheahan <jrsheahan-at-optushome.com.au>]

On Sat, Nov 23, 2002 at 04:45:47AM -0500, Tim & Heather Smith wrote:
> 
> Has anyone out there had any problems with resonance when driving stepper
> motors?
> 
> In an effort to figure out what was going on, I used a function generator to
> directly pulse the stepper drivers (Superior Electric STM103's) with the
> motors disconnected from the lead screws.
> 
> I found the motors were stalling at around the same frequency, but if I
> accelerated them quickly past this frequency they would run happily up to
> over 3000Hz (or 900rpm) which would give me 930 mm per min. While I don't
> need to travel this fast it would be good be able to get back to around
> 600mm/min again.
> 
> Is there a simple fix for this that I could try? or is there some thing I
> could do to move the resonance frequency higher?

Hi Tim
Is this a mechanical or electrical resonance?

I can think of methods of overcoming either - but they are pretty 
different.

If you are seeing this on a signal generator its obviously not emc
specific.
regards, john