(DIR) Return Create A Forum - Home
---------------------------------------------------------
Office of Steam Forum for Model &amp
;amp;amp;amp;amp;amp; Toy Steam Gas &amp
;amp;amp;amp;amp;amp;amp; Hot Air Engines
(HTM) https://officeofsteamforum.createaforum.com
---------------------------------------------------------
*****************************************************
(DIR) Return to: General Discussion - Dynamos, Generators, Alternato...
*****************************************************
#Post#: 28011--------------------------------------------------
Stuart Dynamo
By: Steam Technology Date: August 4, 2020, 6:28 pm
---------------------------------------------------------
I have acquired a smaller Stuart dynamo thanks to the generosity
of Ade (Yozhek) which I have a project in mind for, but more on
that at a later date.
The dynamo looks good on the outside but unfortunately has some
issues.
[attachimg=1]
First run showed no output but I did get the occasional 'blip'
of voltage. On closer inspection. one of the posts that hold the
brush springs is missing which means the spring can dislodge
from the brush.
[attachimg=2]
The spring can be put back on the brush and the dynamo will work
but there is very little tension, it dislodges easily with
vibration and under load the voltage decreases as the brush
bounces.
I am going to think on it for a while.
Also whoever did the last soldering must have used a blow
torch!!
#Post#: 28017--------------------------------------------------
Re: Stuart Dynamo
By: Scorpion2nz Date: August 4, 2020, 10:12 pm
---------------------------------------------------------
I might be repeating myself
How thick is the plastic where the post fits?
Drill and tap and thread a brass rod ? Or drill and push fit a
rod
If you are really good maybe thread a nylon/delrin or something
similar rod
#Post#: 28020--------------------------------------------------
Re: Stuart Dynamo
By: yozhek Date: August 5, 2020, 4:18 am
---------------------------------------------------------
Hi Dave,
I didn't see the post was broken, the awful soldering caught my
eye but i was more focussed on the awful Stuart Victoria engine
sitting next to the dynamo. As usual Dennis is on the right
track, depending how thick the plastic is right there. Maybe
press the motor out of the Stuart housing and replace it with a
DC motor of similar dimensions?
Cheers
Ade
#Post#: 28024--------------------------------------------------
Re: Stuart Dynamo
By: Steam Technology Date: August 5, 2020, 6:32 am
---------------------------------------------------------
[quote author=Scorpion2nz link=topic=2901.msg28017#msg28017
date=1596597169]
I might be repeating myself
How thick is the plastic where the post fits?
Drill and tap and thread a brass rod ? Or drill and push fit a
rod
If you are really good maybe thread a nylon/delrin or something
similar rod
[/quote]
Ha Ha. I thought it was an echo off the Kaweka Ranges.
#Post#: 28025--------------------------------------------------
Re: Stuart Dynamo
By: Steam Technology Date: August 5, 2020, 6:35 am
---------------------------------------------------------
[quote author=yozhek link=topic=2901.msg28020#msg28020
date=1596619110]
Hi Dave,
I didn't see the post was broken, the awful soldering caught my
eye but i was more focussed on the awful Stuart Victoria engine
sitting next to the dynamo. As usual Dennis is on the right
track, depending how thick the plastic is right there. Maybe
press the motor out of the Stuart housing and replace it with a
DC motor of similar dimensions?
Cheers
Ade
[/quote]
Spot on Ade.
All good ideas, I have pondered all of them as well as various
glue methods. However this version of the dynamo is actually a
commercial PM motor in a case.
[attachimg=1]
So I have more options, maybe a different motor which would also
allow me to increase the power uotput
#Post#: 28026--------------------------------------------------
Re: Stuart Dynamo
By: yozhek Date: August 5, 2020, 6:50 am
---------------------------------------------------------
Hey, good work Dave, didn't take you long to get that apart, now
you can get to the tabs and remove the end cap to see what you
are dealing with ;D
Would be good to find a better motor to give higher output, no
idea how old that thing is but technology is always improving,
stronger magnets etc.
Best wishes
Ade
#Post#: 28037--------------------------------------------------
Re: Stuart Dynamo
By: Steam Technology Date: August 5, 2020, 4:33 pm
---------------------------------------------------------
I have a motor which would suit perfectly but I will need to
bore the case out 2 or 3 mm to fit it.
I am still deciding which way to go.
#Post#: 28056--------------------------------------------------
Re: Stuart Dynamo
By: Steam Technology Date: August 6, 2020, 4:40 am
---------------------------------------------------------
Have repaired the post, I can remove it if I find a better piece
of nylon et al.
[attachimg=1]
[attachimg=2]
I also knocked up a housing etc for another PM Motor
[attachimg=3]
The two actual motors are very similar in dimensions but poles
apart in performance.
The Stuart is listed as 4v 1A at 8000rpm
The other I have tested 12v 1.5A at 3000rpm and will light a 20
watt 12v globe.
I have a few of the second PM motors and I hqve used them in
variuos guises.
#Post#: 28081--------------------------------------------------
Re: Stuart Dynamo
By: yozhek Date: August 7, 2020, 4:22 am
---------------------------------------------------------
Spot on Dave! glad you got it fixed, although it sounds like
the other motor would do a better job...
Best wishes
Ade
#Post#: 28093--------------------------------------------------
Re: Stuart Dynamo
By: Steam Technology Date: August 7, 2020, 5:43 pm
---------------------------------------------------------
[quote author=yozhek link=topic=2901.msg28081#msg28081
date=1596792120]
Spot on Dave! glad you got it fixed, although it sounds like
the other motor would do a better job...
Best wishes
Ade
[/quote]
Thanks Ade, it works well on load now.
*****************************************************
(DIR) Next Page