Re: [CAD_CAM_EDM_DRO] Small DC motor Caps - what size to use?

That's interesting. The motor designers I know tell me that if your
commutator is arcing, then it's not advanced properly. Maybe slip noise...

On 7/20/06, Hugh Prescott <hugh345@...> wrote:
>
>
> The caps are for suppression of electrical noise that is generated by
> arcing between the brushes and the commutator.
>
> Drives the radio receiver crazy causing loss of control of RC vehicle.
> Probably not needed in a servo system but probably will not hurt. May
> reducewear on the commutator.
>
> Normal values are .1 uf, garden grade bypass caps. Normal to use three,
> case to each brush and brush to brush.
>
> Hugh
> Old RC guy
>
>
> lcdpublishing wrote:
>
> >Hi guys,
> >
> >A couple weeks ago I was asking about the small caps on the DC motor I
> >was using (R/C car motor). We covered the whys, but not the values to
> >use.
> >
> >I have another motor I will also be using. This one is from a 6 volt
> >cordless screwdriver that originally was intended to run on 4 AA
> >batteries. This motor does not have any caps on it and from what I
> >learned last time, it would make good sense to solder a couple on
> >while it is still accessible.
> >
> >Only thing is, I don't have a clue what size caps to use. Is there
> >a "rule of thumb" or "this should work fine" range you can give me.
> >
> >Thanks
> >
> >Chris
> >
> >
> >
> >
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