[amsat-bb] Re: Motor for Yaesu G5500 Azimuth Rotator?
David Palmer KB5WIA
kb5wia at amsat.org
Fri Feb 24 16:38:18 PST 2012
Just a quick update -- Yaesu Parts just emailed me and advised that
they don't think any of the motors from other rotators are directly
compatible with the G5500 azimuth motor -- the estimate on arrival
time of more stock is uncertain, possibly 4-6 weeks or longer.
I haven't sourced a direct replacement motor yet; the original motor
was sent down to Eurton Electric yesterday for rewinding, hopefully
I'll have a quote and time estimate for that soon.
On Fri, Feb 24, 2012 at 4:26 PM, Phil Karn <karn at ka9q.net> wrote:
> On 2/23/12 2:51 PM, Tim Cunningham wrote:
>> I have rewound a few of these motor coils and a #24 to #26 gauge enamel
>> wire should work. A #22 gauge enamel wire would be too large and you
>> would not be able to wind the same number of turns.
>> It is the breakdown of the enamel due to wire heating that makes them
>> fail by creating a short circuit in the windings.
> I don't remember the wire size I used (it's been over 20 years) but
> you're right about the short circuit. Just one shorted turn will form
> the shorted secondary of a transformer, and the I^2R losses in that turn
> will create quite a bit of heat that will further damage the insulation
> on the nearby windings until the whole thing is toast.
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