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Post by Toofaruphill on Sun May 12 2019, 17:56

Wonder if anyone has experience of using a dynamo for 12v battery charging please.
I had thought of an alternator but as I want to double its use from Lister d ,- 750 rpm to a large model steam engine to use on the road it will have to charge at even less than 750rpm
I m sure I have pulleys near enough to do it.I have no idea though exactly what to look for ,never got to grips with electrics!
If I buy a dud is there someone reliable who might be able to put it right at a reasonable price.Thank you very much
Jonathon

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Post by Robotstar5 on Sun May 12 2019, 18:13

Are you looking for a commercial or automotive type dynamo?

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Post by Toofaruphill on Sun May 12 2019, 18:33

Umm!
Automotive as its only for battery charging

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Post by nickh on Sun May 12 2019, 19:31

Car alternators generally start charging at a lower speed than dynamos.

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Post by Toofaruphill on Sun May 12 2019, 19:38

Well I got that backwards!
Thanks nick

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Post by Robotstar5 on Sun May 12 2019, 22:05

Toofaruphill wrote:Umm!
Automotive  as its only for battery charging

Probably the most common "vintage" dynamos would be the Lucas C39/C40 range and they have to be driven at 1100 -1500 rpm to achieve what known as "cut in" speed (starts to charge) and faster 3000+rpm to get useful current out of them so you will need to calculate pulley sizes around those speeds.

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Post by Toofaruphill on Mon May 13 2019, 07:30

Thanks Stuart.. I think I need something a bit slower then

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Post by Robotstar5 on Mon May 13 2019, 08:35

Toofaruphill wrote:Thanks Stuart.. I think I need something a bit slower then

Handy pulley calculator - https://www.blocklayer.com/pulley-belt.aspx

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Post by Toofaruphill on Mon May 13 2019, 09:18

Thats very usefull Stuart.

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Post by woody on Mon May 13 2019, 11:35

I would expect that if you run the dynamo / alternator using a belt round the flywheel you'd get plenty of speed. I've seen it done many times.

You'll need a control box if you have a dynamo. Talk the Morris Miinor or BMC boys at the next rally.

Dynamos tend to have slightly larger pulleys than alt's so will run slower.

Alternators can run faster than dynamos because they have proper ball/roller bearings, rather than plain bearings.

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Post by Toofaruphill on Mon May 13 2019, 12:30

I always thought alternators ran faster because they had to!
Good place to learn here!
Pulleys are no problem and the Lister d at 750 rpm should be ok but the steam engine is,I think,max 500 , and only a 12 onch flywheel. Not any space to fit anything else bigger.
Thats why I need the one which works at lowest rpm.

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Post by Keith-PU8 on Mon May 13 2019, 20:30

Try this. https://digitalcommons.calpoly.edu/cgi/viewcontent.cgi?referer=https://www.google.co.uk/&httpsredir=1&article=1212&context=eesp
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Post by chiefy on Tue May 14 2019, 09:25

Very interesting i was thinking of using a MK 25 Villiers for charging 12 volt batteries and am not into electrics am i right in thinking that it is easier to use a alternator which i have somewhere in my workshop.
Regards.
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Post by Robotstar5 on Tue May 14 2019, 15:21

chiefy wrote:Very interesting i was thinking of using a MK 25 Villiers for charging 12 volt batteries and am not into electrics am i right in thinking that it is easier to use a alternator which i have somewhere in my workshop.
Regards.
Ghiefy.

A dynamo needs an external charging regulator etc. whereas an alternator will usually have "everything in one box" where so less wiring involved.

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Post by chrismac on Wed May 15 2019, 16:01

I have a lucas dynamo with the regulator running of a lister D, belt round the flywheel and onto the dynamo pulley works fine, a dynamo looks more authentic if your bothered about that, just make sure you get one that spins in the rotation you want for your set up to save you twisting the belt,

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Post by chiefy on Thu May 16 2019, 13:03

Yes i do agree that a dynamo looks more in keeping with our old engines,i do have a alternator in my workshop i have just dug it out,is the regulator inbuilt into the alternator?.
Regards,
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Post by Robotstar5 on Thu May 16 2019, 14:22

chiefy wrote:Yes i do agree that a dynamo looks more in keeping with our old engines,i do have a alternator in my workshop i have just dug it out,is the regulator inbuilt into the alternator?.
Regards,
Chiefy.

It's normally a module on the end casing, if you post a pic it may help.

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Post by chiefy on Fri May 17 2019, 08:48

Ok Stuart first off i don't do pictures i do not have a camera and even if i did i doubt i would be able to get them on the forum,thanks for the info i will have a look at the alternator and see if there is owt on the end as you described it.
Regards,
Chiefy.

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Post by Robotstar5 on Fri May 17 2019, 13:55

chiefy wrote:Ok Stuart first off i don't do pictures i do not have a camera and even if i did i doubt i would be able to get them on the forum,thanks for the info i will have a look at the alternator and see if there is owt on the end as you described it.
Regards,
Chiefy.

There's another thread running on using an alternator which may be of interest? - Link

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This is a rear view of a typical Lucas alternator, you can see the regulator module embedded in the casing

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