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Author Topic: Stuart Dynamo  (Read 201 times)

Steam Technology

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Stuart Dynamo
« on: August 04, 2020, 06:28:05 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.

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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.


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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!!


ALWAYS WORKING TO FIND A CURE FOR CENOSILLICAPHOBIA
Cheers. Dave.

Scorpion2nz

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Re: Stuart Dynamo
« Reply #1 on: August 04, 2020, 10:12:49 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

yozhek

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Re: Stuart Dynamo
« Reply #2 on: August 05, 2020, 04:18:30 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

Steam Technology

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Re: Stuart Dynamo
« Reply #3 on: August 05, 2020, 06:32:18 am »
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.
ALWAYS WORKING TO FIND A CURE FOR CENOSILLICAPHOBIA
Cheers. Dave.

Steam Technology

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Re: Stuart Dynamo
« Reply #4 on: August 05, 2020, 06:35:50 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

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.

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So I have more options, maybe a different motor which would also allow me to increase the power uotput
ALWAYS WORKING TO FIND A CURE FOR CENOSILLICAPHOBIA
Cheers. Dave.

yozhek

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Re: Stuart Dynamo
« Reply #5 on: August 05, 2020, 06:50:34 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

Steam Technology

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Re: Stuart Dynamo
« Reply #6 on: August 05, 2020, 04:33:17 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.
ALWAYS WORKING TO FIND A CURE FOR CENOSILLICAPHOBIA
Cheers. Dave.

Steam Technology

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Re: Stuart Dynamo
« Reply #7 on: August 06, 2020, 04:40:28 am »
Have repaired the post, I can remove it if I find a better piece of nylon et al.

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I also knocked up a housing etc for another PM Motor

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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.
ALWAYS WORKING TO FIND A CURE FOR CENOSILLICAPHOBIA
Cheers. Dave.

yozhek

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Re: Stuart Dynamo
« Reply #8 on: August 07, 2020, 04:22:00 am »
Spot on Dave!  glad you got it fixed, although it sounds like the other motor would do a better job...
Best wishes
Ade

Steam Technology

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Re: Stuart Dynamo
« Reply #9 on: August 07, 2020, 05:43:41 pm »
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.
ALWAYS WORKING TO FIND A CURE FOR CENOSILLICAPHOBIA
Cheers. Dave.

 

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