Re: Gecko White Paper Question

Midband resonance in a step motor is caused by a 180 degree system
phase lag. A phase lead (derivate) component must be added to the
system to bring the total phase lag into an acceptable range (90 to
120 degrees). This is done by sensing the rate of motor load change
and using that signal to phase modulate the incoming step pulses. It
is the phase modulator that adds a variable delay (15 to 60uS) to the
step pulses.

Mariss

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Les Newell <lesnewell@...>
wrote:

>
> This is a combination of the time it takes for the signal to filter
> through the electronics and the mid band resonance damping. In

practise

> it makes no measurable difference.
>
> Les
>
> Aaron wrote:
> > I have a question about the following phrase in the Gecko Drive

white paper, "Microstepping occurs on the falling edge ("1" to "0"
transition) of the "Step" input, and is delayed from 4 to 60 uS
depending on the motor's speed."

> >
> > Can anybody expain the purpose of this delay?
> >
> > Aaron
> >
> > [Non-text portions of this message have been removed]
> >
>
>
>
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>