775 Motor based Dynamo ?

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775 Motor based Dynamo ?

This topic has 46 replies, 6 voices, and was last updated 21 December 2024 at 18:48 by JasonB.

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8 December 2024 at 22:32 #769493
noel shelley
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@noelshelley55608
Food for thought ! I like the drive. Noel.
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8 December 2024 at 23:19 #769509
Michael Gilligan
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@michaelgilligan61133
Potentially useful video by Big Clive

https://youtu.be/jSEKMeAv4ps?feature=shared

MichaelG.

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9 December 2024 at 03:54 #769511
Michael Gilligan
Participant
@michaelgilligan61133
They’re very modestly priced too

https://www.ebay.co.uk/itm/162870032227

MichaelG.
9 December 2024 at 10:02 #769520
noel shelley
Participant
@noelshelley55608
It gives you the coil, laminations and magnet. Before dismantling fit small pulley and run up to see what output you get – the windings are very fine wire. Coil may need rewinding. If using on leds remember to use a rectifier . Noel.
9 December 2024 at 11:31 #769544
Michael Gilligan
Participant
@michaelgilligan61133
On 9 December 2024 at 10:02 noel shelley Said:

It gives you the coil, laminations and magnet. […]

All for roughly half the cost of getting a bar-magnet from Stuart

Thus demonstrating the power of mass-production.

MichaelG.
9 December 2024 at 11:39 #769545
duncan webster 1
Participant
@duncanwebster1
Depending on what output it gives it might not need rectifying diodes, LEDs are themselves diodes (the clue is in the name). Put 2 in reverse parallel and one will be on all the time.
9 December 2024 at 11:55 #769551
JasonB
Moderator
@jasonb
On 9 December 2024 at 11:31 Michael Gilligan Said:

On 9 December 2024 at 10:02 noel shelley Said:

It gives you the coil, laminations and magnet. […]

All for roughly half the cost of getting a bar-magnet from Stuart

Thus demonstrating the power of mass-production.

MichaelG.

Or 1/10th the cost of the Stuart kit to make the whole 775 Dynamo

The one I posted just connected straight to the W/M motor, no other electronics required.
9 December 2024 at 13:19 #769562
Michael Gilligan
Participant
@michaelgilligan61133
I don’t disagree, Jason

… but in light of some concurrent discussions about the future of ‘Model Engineering’ we might need to contemplate the relative merits of making a thing for the pleasure of making it vs making a thing to serve a novel purpose.

Personally … I am more interested in the Washing Machine Pump as a source of ‘make-from’ components for some [as yet undefined] experimental project than I am in saving cost and effort in producing a generator to accompany a model steam engine.

Sorry, that’s all rather clumsily worded … I look forward to S.O.D. elaborating on my behalf.

MichaelG.
10 December 2024 at 16:37 #769731
JasonB
Moderator
@jasonb
The Washing Machine Dynamo running off a fairly slow running Aveling DX engine.

More fun than a backup battery next time there is a power cut. I have seen the PM Research Dynamos linked to model steam engines being used to charge a phone

There is a Youtube video of one of the Washingmachine engines being driven and lighting 30 household LED lamps though it was being spun rather fast.

Now I just need to remodel the external shape and then I’ll have a replica of this old Bi-polar motor
10 December 2024 at 18:15 #769749
duncan webster 1
Participant
@duncanwebster1
That link requires me to log in to Facebook. That might happen shortly after hell freezes over.
11 December 2024 at 17:10 #769861
JasonB
Moderator
@jasonb
Well I don’t suppose thinking like that is going to find and encourage new blood into the hobby as that is where they hang out.

In the mean time the body of mine now has a barrel shape and feet.
11 December 2024 at 17:33 #769862
Michael Gilligan
Participant
@michaelgilligan61133
Looks good, Jason

MichaelG.
11 December 2024 at 17:40 #769863
Engine Builder
Participant
@enginebuilder
A stepper motor makes a good generator.

Good output at very low revs.
11 December 2024 at 19:22 #769885
Michael Gilligan
Participant
@michaelgilligan61133
On 10 December 2024 at 16:37 JasonB Said:

[…] There is a Youtube video of one of the Washingmachine engines being driven and lighting 30 household LED lamps though it was being spun rather fast.

[…]

Simple logic seems to suggest that if run at 3,000 rpm it should output 0.2A at mains voltage [but there may be more to it than that]

MichaelG.

.

Ref. __ https://www.askoll.com/en/about.aspx

See 1986 on the timeline

.
11 December 2024 at 21:00 #769898
Michael Gilligan
Participant
@michaelgilligan61133
In case you were wondering [which I was] … Google’s AI overview tells us:

CI.155 on a pump motor refers to the insulation class of the motor, which indicates that the motor can withstand a temperature of 155°C continuously without reducing its life or degrading. This is the maximum temperature rating for Class F insulation.

MichaelG.
13 December 2024 at 09:40 #770075
Michael Gilligan
Participant
@michaelgilligan61133
Having browsed Justia for a while … It appears that this is the patent that best covers the ubiquitous RS0602 Askoll pump:

https://worldwide.espacenet.com/patent/search?q=pn%3DUS2009039723A1

[ click the three-dot menu to access download ]

… it’s well illustrated, so may be of interest

MichaelG.

.

Edit: __ if you find anything better, please correct me
15 December 2024 at 18:44 #770452
JasonB
Moderator
@jasonb
Thank’s Michael, good to see the general arrangement.

Well I got enough work done on the business end over the last couple of days to give things a try this afternoon. Still needs a few finishing touches and some brass nuts and thumb nuts for the connections but it works. The ratio is about 4.4 :1 so dyno is going at 2500-3000 rpm which is just what I wanted as it will be similar to a Stuart so you could run it direct off a high speed engine like a BB or belt it to a slower 10V or H.

I was able to use the existing spherical or is it just self aligning bearing as well as the brushes from the motor which just needed the wire tabs cutting off.
15 December 2024 at 20:02 #770458
Michael Gilligan
Participant
@michaelgilligan61133
Nice !

MichaelG.
16 December 2024 at 09:17 #770485
duncan webster 1
Participant
@duncanwebster1
That’s excellent, looking forward to the ME article.
16 December 2024 at 09:41 #770489
noel shelley
Participant
@noelshelley55608
The addaptation of the brush assembly is neat and it seems to work well. 10/10 and a gold star ! Noel.

PS as Duncan says – it would make a good write up.
19 December 2024 at 13:16 #771014
JasonB
Moderator
@jasonb
While the paint is drying this woud make an interesting version. Not sure what use it would be but a timely one than could be hung on the tree!
21 December 2024 at 18:48 #771706
JasonB
Moderator
@jasonb
Well the paint is dry, the dynamo put back together and I’ve been ~~having a play~~ seriously testing things.

The old Stuart 10V was used as most people can relate to that. Air at around 30psi. I used the same old bit of scrap with a couple of O rings stretched over it as the pulley and ran that against the 10V’s flywheel and a couple of calculations show the dynamo is running around the 3000rpm mark for the light, probably a bit less on the other items and you can certainly hear the engine working under load when it is driving the smaller DC motor. It would be better set up with a belt at say 1:5 reduction then the 10V could be run a bit slower.

It will still run as a DC motor so could be used to drive other period accessorioes and would not look bad driving the Stuart or PMR model machinery.
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