[ARC5] BC-454-B Dymamotor Question

[J. Forster]

To me, from the downwards spike in the voltage waveform, indicates a brush
is not making contact during part of the rotation. Tis could be caused by
a stuck brush or some kingf of commutator wear. It is most likely on the
HV side.

FWIW,

-John

===============


> On 17 Jan 2013 at 19:39, Mark K3MSB wrote:
>
>> Is what I'm hearing with the dynamotors normal?
>
> Absolutely not.
>
> Although I am most certainly no expert, it sounds to me as though you
> either
> have a brush not making contact, the commutator insulators are "too high",
> or the filters are bad.
>
> About the worst you should be hearing from a good dynamotor is a very
> pretty "singing" sound. Quite high-pitched and not very loud.
>
> In any case, you should be certain the bearings are good, clean, and
> properly lubricated before you ever run any of those.
>
> Mike Hanz has a web page devoted to restoring dynamotors which is
> absolutely excellent.
>
> If anyone here is an expert on dyamotors, it would be him.
>
> Ken W7EKB
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>