Re: Rotor inertia.

John could you explain, about 2 pole filter.
What is it ? A integrated component (what is the reference) or is an
schematic.
What are the pros in using this filter vs not using ?
Looks like a simple improvement, in geckos.

Thanks in advance

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:
>
>
> kimvellore wrote:
>
> >Mariss,
> > My 2C on this subject. The heat generated in a inductor is due
to
> >the resistance or due to eddie current. For the low-inertia both
> >would be small, hence the heat generated due to the increased
current
> >should in theory be less then in regular motors... what do you
think?
> >
> >
> >
> But, the ripple current goes up as the inductance goes down, as the
Gecko
> drives put a 25 KHz square wave of full DC power supply voltage
across
> the motor. I used a 2-pole filter in my servo amps for a variety
of
> reasons.
> It reduces EMI emissions, it saves the motor from the ripple
current, and
> it allows short circuit currents to rise slowly enough that the
fault logic
> can turn the amp off before anything blows up.
>
> Jon