Re: Ground wire from motor case to PS ground?

Noise. The motor winding forms one plate of a capacitor, the bobbin
forms the di-electric and the motor case forms the other plate. The
stuff that's on the winding is a high frequency signal; you want to
ground the other plate of the capacitor to shunt the noise harmlessly
to ground.

Mariss

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Michael Gamber"
<mgamber@c...> wrote:

> OK, but what about the second part of the question... What happens
> if I don't do this? Is this a noise issue? or a safety?
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, Tony Jeffree <tony@j...>
> wrote:
> > At 15:40 12/03/2004, you wrote:
> > >A while ago, Mariss suggested to "Remember to run a ground wire
> from
> > >motor case back to power supply ground." referring to wiring
> servos.
> > >
> > >How do you accomplish this? There is nothing on the motor case to
> > >attach to...
> >
> > What about the motor mounting bolts? I believe you will find that
> they are
> > electrically in contact with the case.
> >
> >
> > Regards,
> > Tony