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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 13:53 - 29 Jul 2021 Post subject: Single phase alternator winding pattern |
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This is complex. I'm a bit out of my depth with it.
The alternator I have on my Enfield is an aftermarket one. As purchased, it was made with an AC/DC setup. What turns out to be a very small, single DC coil to slowly charge a diddy battery and a much meatier three coil AC output for lighting. It turns out it was setup with an AC regulator and a halfwave rectifier for the DC.
Here's the stator I have:
https://lh3.googleusercontent.com/pw/AM-JKLWCge-Mx9EhF3Nmn3vMO5gIfEoOvnzOp69Lt_3aTPwpq1vUQ0V16rUPyXWB51CK4zdS18qKLudhSJCiT7_b97994Cki5RQVVPV75v6dQxgv7GYMb_ZSc78P5_mK6SZ9i-wg3TelyY2oLYyENYlsAGd6=w1182-h886-no
The top coil, wrapped in black is for the ignition and is totally seperate.
It has a white, yellow and black wire. Black is ground.
The AC comes in on the yellow, takes 20 clockwise turns round the left coil, 100 turns anticlockwise round the bottom coil and 100 turns clockwise round the right coil and terminates to ground.
The DC comes in on the white, takes 80 turns clockwise round the left coil over the top of the AC winding then terminates on the yellow.
I want to convert this to single phase DC. I have a proper, single-phase DC reg/rec now.
The company now sells a DC stator for this exact purpose. Thing it it's a) out of stock and b) £150.
It does however use exactly the same base plate and rotor. Here's the only picture I can find of the DC stator:
https://lh3.googleusercontent.com/pw/AM-JKLWLnA2-pVsDVjtziR0Rtao4SFq7OrYSTSdBWE4l-bAxs1RirhA2tH2E0rs8V0r1j-hkToZFREmpTFcCcemMTl8izaZ1el1cdyExIfccILFWmrwClpkokdAJvPe69jI11KOYStNLm66cYTWPKa6yfPcF=w693-h462-no
I think it's a fair assumption each coil still holds 100 turns and is using the same gauge wire. My question is, how should I wind it? I see two options (but there may be more);
Option 1:
Wap 100 turns round each in turn. Then take the end back to the other output.
Option 2:
Wrap 50 turns round the bottom and left coils, `100 round the right then come back with another 50 turns on the bottom and left coils.
I have a feeling it actually makes no difference?
Then direction? Looking at the picture, it seems as if the left and right are wound anticlockwise and the bottom is wound clockwise but it's not easy to see. This roughly fits with how they did the AC output on the original (bottom wound the opposite direction to the left and right).
Or am I going to set fire to my bike? ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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steve the grease |
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steve the grease Crazy Courier
Joined: 26 Jan 2018 Karma :
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 15:24 - 29 Jul 2021 Post subject: |
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 15:38 - 29 Jul 2021 Post subject: |
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Aha.
A mate just came up with this from an electonics textbook which seems to fit the ticket. Effectively 100 round each and back to the start with the "bottom" coil wound in the opposite direction to the two side ones. ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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WD Forte |
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WD Forte World Chat Champion
Joined: 17 Jun 2010 Karma :
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Pete. |
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Pete. Super Spammer
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stinkwheel |
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stinkwheel Bovine Proctologist
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Pete. |
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Pete. Super Spammer
Joined: 22 Aug 2006 Karma :
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Posted: 06:23 - 30 Jul 2021 Post subject: |
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I had no idea that the LED drew so little.
When you un-wound the stator did you find any fault or evidence of shorting? Any portion of the winding wire discoloured? Usually a short in a coil makes at least some of it turn black and crispy.
You say that the coils are dirty-earthed through the base of the stator? Bit poor really it could possibly be the source of your fault. It's a thing that work fine when it works (which is most of the time) but it much more reliable when loom earths are used hence why all those 70's Japanese bike indictors with just a feed wire and dirty earth return were replaced with 2-wire units. ____________________ a.k.a 'Geri'
132.9mph off and walked away. Gear is good, gear is good, gear is very very good |
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stinkwheel |
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stinkwheel Bovine Proctologist
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WD Forte |
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WD Forte World Chat Champion
Joined: 17 Jun 2010 Karma :
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Posted: 16:45 - 30 Jul 2021 Post subject: |
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Its probably a project that needs some experimenting
and woudl love to put my scope on it but
my initial thoughts on a single phase setup would be to
wind all the bobbin in the same direction as in your proposed setup pic
This cos as the coils are at 90 degree intervals and the rotor has 8 ( or 4)
magnets, all windings will be swept by the same N or S pole at the same time
Make sure to sleeve and insulate the wire from the engine body(ground) and run both
tails to something like this which I assume/hope has a full wave bridge rectifier inside
as well as voltage regulation
https://i.ebayimg.com/images/g/~EwAAOSw5W9e62Zp/s-l1600.jpg
https://www.ebay.co.uk/itm/313119747851?hash=item48e7642f0b:g:~EwAAOSw5W9e62Zp
On the output as well as a big cap, I'd add a smaller secondary cap for extra ripple smoothing
as leds tend to react a lot more to voltage variations than an incandescent blub.
I'd consider using a weeny scooter battery if voltages allow as this can help smooth out voltages
I can only guess but comparing it to similar setups I reckon you may get say 70-80 watts/6A-ish out of it
which is enough to run a 20w headlight which will be fookin bright!
Be wary when buying led headlamps as I've seen many sellers state the equivalent power rather then actual which can be misleading
and say its 100W when in reality it uses 20W of real power ____________________ bikers smell of wee |
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Old Thread Alert!
The last post was made 2 years, 268 days ago. Instead of replying here, would creating a new thread be more useful? |
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