[ARC5] ART-13 dynamotor woes

[Mike Everette]

Hmm, could be that this dyno was "unused" because it was one which failed final inspection and wound up in a pile of surplus.  There is precedent... I once had a brand new in-the-box SCR-522 (complete with control head, cables and junction boxes) which had a receiver that had never been aligned.  Probably caught on the production line when the plug was pulled on wartime contracts.

I have also seen old surplus ads from the late 40s advertising "incomplete" BC-221s.  In these cases it was fairly clear that they were the remains of canceled contracts.

The DY-17 is a screamin' meanie.  A long time ago, one of my friends ran his ART-13 on one, inside his house... he'd built up a huge power supply for it -- no batteries involved, but some of the biggest stud-mounted diodes I ever remember seeing!  Anyway, when that thing wound up, the noise was like a form of cruel and unusual punishment.

73

Mike
W4DSE

--- On Sun, 2/10/13, Meir WF2U <wf2u at ws19ops.com> wrote:

> From: Meir WF2U <wf2u at ws19ops.com>
> Subject: Re: [ARC5] ART-13 dynamotor woes
> To: "ARC-5" <arc5 at mailman.qth.net>, "Milsurplus" <milsurplus at mailman.qth.net>, "ART-13_transmitters" <art-13_transmitters at yahoogroups.com>
> Date: Sunday, February 10, 2013, 6:49 PM
> Thanks for all the input from those
> who replied.
> 
>  
> 
> In the meantime I dug out the manual with the detailed
> exploded drawing of
> the Eicor dynamotor and as I can see it, I can do the
> disassembly down to
> getting to the field coils out of the dyno body for
> inspection and hopefully
> repair.. It's easier (at least in the drawing) to do than I
> initially
> thought. I made a mistake when I mentioned 2 series
> windings. There are both
> series and shunt coils, and as Robert mentioned, the
> schematic shows 4 shunt
> and 2 series windings.
> 
>  
> 
> Again, the dynamotor in question was most likely never used
> before, there is
> no corrosion of any kind visible, and at least as far as I
> could tap and
> poke around the connections, nothing was loose. 
> 
> I always inspect dynamotors after I get them, before I apply
> power anyway.
> 
>  
> 
> The DY-17A/ART-13 is much nicer to work on than the
> DY-17/ART-13, which has
> a lot of discrete components in the base, with many solder
> joints.  The A
> model has all canned PI or L configuration L/C filters, and
> all relays are
> of the  enclosed type, everything is connected with
> screw  terminals - so
> disassembly is easy and not messy. All the connections
> within the dyno are
> also with screw terminals. 
> 
>  
> 
> To those who don't like dyno noise, I don't mind. The noise
> is really not
> objectionable even from these big dynamotors. I have them on
> the concrete
> floor on a thick rubber mat. A dynamotor with good bearings,
> properly
> lubricated is usually not very loud (T-195/GRC-19 is an
> exception.).
> 
>  
> 
> 73, Meir WF2U
> 
> Landrum, SC
> 
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