[amsat-bb] Re: Motor for Yaesu G5500 Azimuth Rotator?

[Tim Cunningham]

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.

Tim - N8DEU

----- Original Message ----- 
From: "Nick Pugh" <quadpugh at bellsouth.net>
To: "'David Palmer KB5WIA'" <kb5wia at amsat.org>; "'AMSAT BB'" 
<amsat-bb at amsat.org>
Sent: Thursday, February 23, 2012 4:09 PM
Subject: [amsat-bb] Re: Motor for Yaesu G5500 Azimuth Rotator?


> Hi Dave
> I have rewound the motors. It take a couple of hours but is doable. I went
> to Radio shack and bought I think # 24 or 26 gale wire.
>
> nick
>
> -----Original Message-----
> From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
> Behalf Of David Palmer KB5WIA
> Sent: Thursday, February 23, 2012 8:32 AM
> To: AMSAT BB
> Subject: [amsat-bb] Motor for Yaesu G5500 Azimuth Rotator?
>
> Hi Everyone,
>
> Well I'll be QRT from the sats for a little while!!  After replacing
> my UHF antenna on the backyard satellite array, I managed to catch the
> (slightly longer) new antenna on the house roof and jammed the Yaesu
> G-5500 rotator, ugh!   Even though I had replaced the normal 2-amp
> fuses in the controller with 1-amp fuses, the azimuth motor still
> managed to overheat and burn out.
>
> I disassembled the azimuth rotator, and although the gears, bearings,
> switches, and capacitor are all OK, the motor has quite a burnt smell.
> Bench-testing the unit with motor removed from the assembly shows the
> motor doesn't spin at all in one direction, and spins slowly but draws
> high current in the other.  Coil windings are in series for
> left/right, should be 3.5 + 3.5 = 7.0 ohms, and the right coil is
> showing only 1.0 ohms resistance.  The azimuth motor is definitely
> toast.    Fortunately, the controller is OK (both the Az and El sides
> of the controller successfully control the elevation rotator).
>
> I just got off the phone with Yaesu parts, and unfortunately the
> replacement motor has been backordered from Japan since December.  No
> estimate yet of when more might come in.
>
> Question to the list:  does anyone have a G5500 azimuth rotator with a
> working motor available for parts?  Or any other ideas for
> replacement?
>
> 73!  Dave KB5WIA
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