paso alternator is it single or twin phase
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paso alternator is it single or twin phase
paso alternator is it single or twin phase ?
Any one know ? as I need a new regulator.
Any one know ? as I need a new regulator.
- higgy
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Re: paso alternator is it single or twin phase
Depends, some are single some are two phase, ST2 after the first 2 years went to 3 phase which is a big deal to convert to. Does not make a difference as to which regulator you need, only the way it gets wired up is different
The very best regulator is a Mosfett hanging in a good airstream
The very best regulator is a Mosfett hanging in a good airstream
Ducati,making mechanics out of riders since 1946
There's no problem so bad that a little fixing can't make it worse! : )
If it ain't broke keep fixin it till it is
88 750
90 906
92 907ie
There's no problem so bad that a little fixing can't make it worse! : )
If it ain't broke keep fixin it till it is
88 750
90 906
92 907ie
- ducinthebay
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Re: paso alternator is it single or twin phase
All Paso and Sports are single phase alternators. Two wires. Each phase 180 from the next
There is no such a thing as two phase.
Later model Ducatis are 3 phase, with 3 wires. Each phase 120 from the others.
And yes, you can use a 3 phase R/R on a single phase system, just use 2 of the leads. As long as the R/R is rated for enough wattage.
But you can not put a single phase R/R on a 3 phase alternator. You will only get 1/3 of the power out.
Cheers, Phil
There is no such a thing as two phase.
Later model Ducatis are 3 phase, with 3 wires. Each phase 120 from the others.
And yes, you can use a 3 phase R/R on a single phase system, just use 2 of the leads. As long as the R/R is rated for enough wattage.
But you can not put a single phase R/R on a 3 phase alternator. You will only get 1/3 of the power out.
Cheers, Phil
Duc in the Bay
1990 750 Sport x2-Rosso Blanko (900ss copy) & Nuovo Nudo (Scrambler project)
1991 907 -mostly stock
2002 ST4s - Lots of mods.
1990 750 Sport x2-Rosso Blanko (900ss copy) & Nuovo Nudo (Scrambler project)
1991 907 -mostly stock
2002 ST4s - Lots of mods.
- higgy
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Re: paso alternator is it single or twin phase
ducinthebay wrote:All Paso and Sports are single phase alternators. Two wires. Each phase 180 from the next
There is no such a thing as two phase.
Later model Ducatis are 3 phase, with 3 wires. Each phase 120 from the others.
And yes, you can use a 3 phase R/R on a single phase system, just use 2 of the leads. As long as the R/R is rated for enough wattage.
But you can not put a single phase R/R on a 3 phase alternator. You will only get 1/3 of the power out.
Cheers, Phil
wanna bet ?
Yes it is true Paso stators are two output wires. Some are wired with one wire wrapped in one direction( single phase) Others are wired with two wires joined at the output terminals ( two Phase)
You know of a single phase regulator still in production ?
Ducati started the "3 Phase" stator with the 99 model ST2 and changed the crankshaft
each phase, Oh you mean each of 2 phasesEach phase 180 from the next
Phil some stators as I said are one continuous wire, some are two wires run in opposite directions on the stator
joined at the stator terminals
Ducati,making mechanics out of riders since 1946
There's no problem so bad that a little fixing can't make it worse! : )
If it ain't broke keep fixin it till it is
88 750
90 906
92 907ie
There's no problem so bad that a little fixing can't make it worse! : )
If it ain't broke keep fixin it till it is
88 750
90 906
92 907ie
- Derek
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Re: paso alternator is it single or twin phase
I have to disagree. The may have 2 windings in parallel but they are still single-phase.higgy wrote: ... Some are wired with one wire wrapped in one direction( single phase) Others are wired with two wires joined at the output terminals ( two Phase)
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- ducinthebay
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Re: paso alternator is it single or twin phase
I stand corrected. There is such a thing as 2 phase power.
It takes 4 leads and has two single phase circuits that are 90 degrees out.
But not likely on a motorcycle.
http://en.wikipedia.org/wiki/2_phase_power
It takes 4 leads and has two single phase circuits that are 90 degrees out.
But not likely on a motorcycle.
http://en.wikipedia.org/wiki/2_phase_power
Duc in the Bay
1990 750 Sport x2-Rosso Blanko (900ss copy) & Nuovo Nudo (Scrambler project)
1991 907 -mostly stock
2002 ST4s - Lots of mods.
1990 750 Sport x2-Rosso Blanko (900ss copy) & Nuovo Nudo (Scrambler project)
1991 907 -mostly stock
2002 ST4s - Lots of mods.
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Re: paso alternator is it single or twin phase
Hi guys, A little confuseing for a non electrical person,
But I got there in the end,
I had a spare boyer reg/rec fitted it it seems to work fine.
Thanks.
But I got there in the end,
I had a spare boyer reg/rec fitted it it seems to work fine.
Thanks.
- 907pasonut
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Re: paso alternator is it single or twin phase
higgy is correct...I just had a look at the wiring diagrams, the 907 has a single phase alternator two wires one winding, but surprizingly, both the 750 and 906 are in fact two phase with 3 wires and two windings (two voltage wires and a common wire)higgy wrote:Depends, some are single some are two phase
this is according to the diagrams
Cheers Claude.
...long live the square framed duc!
'92 907...numero 2046
'92 851...in progress
...long live the square framed duc!
'92 907...numero 2046
'92 851...in progress
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Re: paso alternator is it single or twin phase
The red wire is a common centre tap point to both the yellow wires. Check this diagram for the Electrex RR51 regulator which connects the 2 windings in parallel.
http://www.electrexworld.co.uk/acatalog/RR51-ducati.pdf
http://www.electrexworld.co.uk/acatalog/RR51-ducati.pdf
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- 907pasonut
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Re: paso alternator is it single or twin phase
thats interesting, on the electrex diagram both windings connect to the same terminal on the regulator and common to the other, on the original wiring diagram it shows 3 separate connections...I think the factor that determines how many pulses you get (1 or 2 per rev) is how the stator has been wired up...ie two windings in series going the same way or the second winding reversed...I still remember the right hand grip rule from trade school
Cheers Claude.
...long live the square framed duc!
'92 907...numero 2046
'92 851...in progress
...long live the square framed duc!
'92 907...numero 2046
'92 851...in progress
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Re: paso alternator is it single or twin phase
I am not sure about the '3 wire' connections from Electrex. The standard Energis reg/rec has two yellow (phase power) and one Red that is for voltage comparitor (warning light circuit). Simply joining the red to a yellow and the yellows together is not to be done! Even if they are right to say the phases are the same (0v diff) it does no harm to treat it as a 2 phase alternator, wire it up as they have and it could make flames. Besides, how are we to measure the alternator output with a static engine?
Last edited by JWilliam on Fri Jun 14, 2013 2:19 pm, edited 1 time in total.
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Re: paso alternator is it single or twin phase
Yeah , I think that there is a bit of that going on here , and I do remember it from "trade school" too but it was confusing as Im sure my teacher had both hands on it when it came to AC theory. Ducati originally made electrical equipment so I spose they know what they are doing ( "someone" dropped a BF bomb on them in the 40's ) Maybe the reason there are 2 single phases in parallel is because its better not to load up the reg/rect with one hi current phase907pasonut wrote:I still remember the right hand grip rule from trade school
I wish I was young again............Id be heaps smarter than last time
- Derek
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Re: paso alternator is it single or twin phase
The reasons for the centre tapped alternator winding has to do with the way the Ducati Elettrotecnica rectifier/regulator works. It uses a 2 diode circuit (actually SCRs I believe) instead of a bridge rectifier.
So it is wired like this;
More conventionally a bridge rectifier is used like this;
For clarity only the rectifier part of the circuit is shown.
So it is wired like this;
More conventionally a bridge rectifier is used like this;
For clarity only the rectifier part of the circuit is shown.
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2015 Scrambler Classic
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Re: paso alternator is it single or twin phase
its all about the heat in the stator and the regulator
Ducati,making mechanics out of riders since 1946
There's no problem so bad that a little fixing can't make it worse! : )
If it ain't broke keep fixin it till it is
88 750
90 906
92 907ie
There's no problem so bad that a little fixing can't make it worse! : )
If it ain't broke keep fixin it till it is
88 750
90 906
92 907ie
- 907pasonut
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Re: paso alternator is it single or twin phase
... good one Mc toolMc tool wrote:Yeah , I think that there is a bit of that going on here ,907pasonut wrote:I still remember the right hand grip rule from trade school
that's a good explanation, and Dereks diagram makes things clear...so...single phase it is
Cheers Claude.
...long live the square framed duc!
'92 907...numero 2046
'92 851...in progress
...long live the square framed duc!
'92 907...numero 2046
'92 851...in progress