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.
73!
Dave KB5WIA
On Fri, Feb 24, 2012 at 4:26 PM, Phil Karn karn@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.