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.
[ Guests cannot view attachments ]
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.
[ Guests cannot view attachments ]
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!!
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
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
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
Ha Ha. I thought it was an echo off the Kaweka Ranges.
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
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.
[ Guests cannot view attachments ]
So I have more options, maybe a different motor which would also allow me to increase the power uotput
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
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
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.
Have repaired the post, I can remove it if I find a better piece of nylon et al.
[ Guests cannot view attachments ]
[ Guests cannot view attachments ]
I also knocked up a housing etc for another PM Motor
[ Guests cannot view attachments ]
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.
Spot on Dave! glad you got it fixed, although it sounds like the other motor would do a better job...
Best wishes
Ade
Spot on Dave! glad you got it fixed, although it sounds like the other motor would do a better job...
Best wishes
Ade
Thanks Ade, it works well on load now.
I decided to keep the Stuart Dynamo original, should keep the purists happy.
Nice job Dave, definitely breathed new life into that one! Are you going to make a more efficient 'Stuart style' out of the better motor and casings you made up?
All the best
Ade
Looking forward to seeing more. Nice work, Dave...!!!
Gil
