faster steppers was Re: Going home

Ian,

RE: top speed with low current
It will depend on the smoothness of the goodies(hardware/software)
spitting out the step pulses. If they are VERY smoothly increasing,
and increasing at a rate the motor/drive combo can achieve... Then
no, it/they won't affect top speed. However,...

If the current (and therefore the torque) is too low, then the motor
WILL lose synchronicity with the pulse train sooner than it otherwise
would... What happens is the pulse IS NOT even enough, or comes too
quickly (same thing, really) and since the motor can't get "there"
soon enough (before the next pulse), it may stall. Since the motor
produces back EMF, it will happen sooner with a lower current setting
(than a higher current) as speeds go up.

So, get the current set up where it needs to be. BTW, don't take this
TOO far. It IS ALSO true that you will want to run at the lowest
current which will achieve PROPER operation of the machine. Resonance
and other bad things happen if the current is too high...

Hope this helps.

Ballendo

--- In CAD_CAM_EDM_DRO@y..., "Ian Wright" <Ian@i...> wrote:
>I may have the motors running a bit lean on current at the moment
>(they only just get warm) but I don't think this would affect their
>top speed would it?
<snip>
> Ian