Lucas 3-Phase Stators

Bernhard said:

I understand that in an alternator, the fields can be switched on according to the load required,

Click to expand...

You're thinking of three-wire single-phase with lighting control.
http://gabma.us/wp-content/uploads/2015/09/3-wire_alt.pdf

Bernhard said:

which is OK, my question is could they be connected in any old fashion or do they have to be connected in the right order?

Click to expand...

All three stator outputs need to be connected or a three-phase wouldn't work, therefore, there's no 'order' of connection.

gtiller said:

@APRRSV sometimes bigger is not always better.

View attachment 14352

This is for a MKIII but other than the starter, your 71 is the same.

Typically in normal riding, we are drawing under 10 amps.
Think about what you are consuming and try and match your charging system to that.

Going three phase is a good idea - you are charging at lower RPMs so it’s better suited to today’s riding and stop go traffic.

But unless you are going to fit electric start and have heated gloves, the RM24 10.5 amp stator (47252) is more than adequate for your 71.

Click to expand...

Thanks for posting this. Saves me some work.
Just need to bump the Iggy to 3.3 for my LR.
I would agree, It appears the 10.5 is plenty for a kick start bike.
The only real issue I can see are the blinkers with full lights.
But then again, this can corrected with some LED's if one is so inclined.

Seems to me a nice package would be the 10.5a, RM 24 with this.
https://andover-norton.co.uk/en/sho...ectifier-single-3-phase-20-amp-with-capacitor

I wonder what the life expectancy of the Cap is?
That's another thread.

Never buy a capacitor combined with ignition or reg/rect inside the box, the capacitor is a weak link and will fail, if it fails correctly you just add a capacitor alongside but if it fails as a short then the whole box is for the bin.

Has anyone ever seen this before?


Shows 3 phase @ 8.7 amps

180W at 12V is 15A, that suggests typo. Part number is for the higher output.

Deets55 said:

Shows 3 phase @ 8.7 amps

Click to expand...

I think that refers to the individual wire (draht) rating as 14/0.30mm is rated at 8.75A and would be the usual stator wire size.

https://www.autoelectricsupplies.co.uk/product/66/category/11
https://www.vehiclewiringproducts.co.uk/p-1020-8-75amp-1mm-sq-14-0-30

MichaelB said:

Thanks for posting this. Saves me some work.
Just need to bump the Iggy to 3.3 for my LR.
I would agree, It appears the 10.5 is plenty for a kick start bike.
The only real issue I can see are the blinkers with full lights.
But then again, this can corrected with some LED's if one is so inclined.

Seems to me a nice package would be the 10.5a, RM 24 with this.
https://andover-norton.co.uk/en/sho...ectifier-single-3-phase-20-amp-with-capacitor

I wonder what the life expectancy of the Cap is?
That's another thread.

Click to expand...

I think that reg/rec is for the trispark , which need a cap to avoid trouble (misfire) to that "special" digital EI.......as said Kommando a more simple one should do the trick ........

Les, kommando thanks for the input.

Thank you Gtiller,
This info is very helpful. My 71 Commando will be fitted with a CNW e-start. However, I have a 70 Commando which will remain kick start.

Ed

gtiller said:

@APRRSV sometimes bigger is not always better.

View attachment 14352

This is for a MKIII but other than the starter, your 71 is the same.

Typically in normal riding, we are drawing under 10 amps.
Think about what you are consuming and try and match your charging system to that.

Going three phase is a good idea - you are charging at lower RPMs so it’s better suited to today’s riding and stop go traffic.

But unless you are going to fit electric start and have heated gloves, the RM24 10.5 amp stator (47252) is more than adequate for your 71.

Click to expand...

@APRRSV apologies - I didn't realise that the 71 you referred to in your original question was electric start.

That changes everything, since after a few starts, your battery will always be running in a depleted state and will require constant charging.


So for the 71 with cNw electric start kit, go for the high power variant RM24 14.5 amp stator (47244)

A good pairing for this is the Shindengen SH775 or SH847 series-type combined rectifier/regulator and a Shorai LFX36L3-BS12 (it's the biggest you'll get in the battery tray, but weighs nothing, is the equivalent to a 36Ah lead acid battery, has 540 cold cranking amps and turns over my 72 combat engine with a cNw electric start as well as the MK3 with the prestolite both like they haven't got sparkplugs in them)

I'm happy to make you a wiring diagram for your 71 if you want to go up that route (just let me know if you have the original 3 pin ignition switch, or the slightly later 4 pin)