single phase and 3 phase alternators

Status
Not open for further replies.

Holeshot

Joined
Dec 3, 2009
Messages
12
I've got a '72 engine in a '70 fastback chassis and I'd like to install a Podtronics regulator/rectifier...Does that engine have a single or a 3 phase alternator and what is the difference? I've got 2 wires coming off the alternator...
Thanks.
 
2 wires = two phases
3 wires = three phases ( unless it's a very old stator in which case it is a two phase )

Jean
 
On the Podtronics diagrams for hooking up their products, it's either a single phase or a 3 phase...it doesn't mention 2 phase.
 
2 - wires from the stator = RM-19 120 Watt single phase.
 
You are, of course, correct, Les.

I believe the RM-19 used the open stator with the two coils connected and the third separate (3-wires) used on the Atlas and others in the '60's, wasn't it?
(Or perhaps the 5-wire ET ignition stator used by the BSA Hornet and TT Triumph?)

Either way, they were not used on Commandos. My mistake.
 
Ron L said:
I believe the RM-19 used the open stator with the two coils connected and the third separate (3-wires) used on the Atlas and others in the '60's, wasn't it?
(Or perhaps the 5-wire ET ignition stator used by the BSA Hornet and TT Triumph?)

Either way, they were not used on Commandos. My mistake.
Click to expand...

I thought you really meant RM21, Ron!

Yes, the RM19 is a three-wire single-phase type, and I believe it was also made as a four-wire type for ET ignitions (according to the Lucas service notes).
 
kommando said:
Jean meant to say single phase I am sure.
Click to expand...


:oops: I think Cristmass is getting to me or it's the fact I finished my bike and I have to do other things around the house or it's my brain hibernating while my body must stay awake, at any rate, you are absolutely right

Jean
 
Been thinking about this for another project I'm working on.

Would I need a single or three phase alternator for a bike with a magneto? It will just have a headlight and tail/brake lights. No battery and just a capacitor.
 
Doesn't matter, 1 or 3 phase would work. The lights would probably be dim at idle though.

Jean
 
Jeandr said:
Doesn't matter, 1 or 3 phase would work. The lights would probably be dim at idle though.

Jean
Click to expand...

Thanks Jean. I was going to use a 3 but have been told a single will be fine. Maybe I'll stick with a 3 phase.
 
Status
Not open for further replies.
Back
Top