RE: [CAD_CAM_EDM_DRO] Re: DC brush type motor control

There are all sorts available, if you go to a supplier tell them what you
are trying to do which is suppress HF noise NOT mains frequency. I often use
T200-2 which are quite big and common with amateur radio people, actually
most of those used by amateur radio people for suppression would be OK.

For a cheap test, the ones on the back of TV tubes work very well and are
often easier to come by, they are a bit of an odd shape though. Find an old
junk TV, there is a screwed clamp on the back of the tube, release this pull
all the coils off and grab the ferrite core. Stick the two halves together
and wind a few turns of both wires to your motor through the core.



Dr. Mark Vaughan Ph'D. B.Eng. M0VAU

Managing Director

Vaughan Industries Ltd, reg in UK no 2561068

Water Care Technology Ltd, reg in UK no 4129351

Addr Unit3, Sydney House, Blackwater, Truro, Cornwall, TR4 8HH, UK.
Phone/Fax 44 1872 561288

RSGB DRM111(Cornwall)

_____

From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of shadi_salhab_78
Sent: 05 April 2007 21:03
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: DC brush type motor control




Hi Les,

Where can I get those ferrite toroids ?
Thanks,

Shadi

--- In CAD_CAM_EDM_ <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>
DRO@yahoogroups.com, Leslie Newell <lesnewell@...>
wrote:

>
> A common mode choke makes a big difference to noise on Rutex drives. Get
> a chunky ferrite toroid and wind the two output wires around it about 6
> or 7 times. Keep it as close to the drives as possible. I had huge noise
> problems on my lathe until I did that.
>
> I think the Rutex drives switch a bit too fast - great for power
> consumption but very bad for noise.
>
> Les
>
> Mark Vaughan wrote:
> >
> > Many of us have Rutex drives. Some like them, some have endless noise
> > issues. The PID control is good, but transient protection and

noise immunity

> > appears not to be.
> >
> > I have Rutex drives, I have beat the noise issues, but after a recent
> > failure am looking for a more reliable drive.
> >
>

[Non-text portions of this message have been removed]