off grid delima 48v system

[mbryner]

You don't *have* to reconfigure the stator coils.   That's only if you have to have 60 V AC from the gen head.   If you rectify the RMS AC you'll get higher DC anyway.   If you're using a charge controller, it depends on the Voc limit.   You can always transform down to the desired voltage, so you don't have to take apart the gen head.    You have a lot of options and if you come up with a different method we'll enjoy reading about it.   

Yes, the threads can get huge and wander all over.   Oftentimes you can do a search and find where a topic was already discussed and you can add onto that thread.   If you're just asking about something that was already discussed, someone may redirect you.   Overall, we're a fairly benign group and won't reprimand too hard if you post in the wrong place.   

Marcus

[rosscat3]

Too late the STS is already apart ,my intentions are to have a generator that is only used for charging my batteries .I got another inverter coming but I don't want to get stuck without a charger again .I cant imagine not being to build a generator more efficient than the inverter besides it is only 60 amps @ full output. Any links to other threads  that might help would be appreciated I was thinking of six legs of 60v. Am i thinking right?

Don C

[mbryner]

Isn't it 4 poles at 60 V AC each?

[mobile_bob]

i am not  familiar with the STS head
however the STC head is three phase, and as such has three groups of two windings each
for a total of 6 sets.

each of which could be rectified separately and then parallel connected to do some heavy low ripple battery charging.

i have one stc 12 genhead i am planning on doing just this sort of thing to, to test the efficiency and max output possible.

kind of anxious to see how it actually performs, but will probably be at least another year before i get to that point.

bob g

[rcavictim]

i am not  familiar with the STS head
however the STC head is three phase, and as such has three groups of two windings each
for a total of 6 sets.

each of which could be rectified separately and then parallel connected to do some heavy low ripple battery charging.

i have one stc 12 genhead i am planning on doing just this sort of thing to, to test the efficiency and max output possible.

kind of anxious to see how it actually performs, but will probably be at least another year before i get to that point.

bob g

Bob, I'm pretty sure what you just described, i.e. "three groups of two windings each
for a total of 6 sets" describes a 3600 RPM 3-phase machine.  That ought to be three groups of four windings each, with the groups offset 120 degrees from the next around the stator for an 1800 RPM, 60 Hz machine.

[rosscat3]

Well I thought I would see six distinct coils to make the conversion a little easier to bring out the other 3 leads. What is there is 3 wires that are already tapped for the line and then 7 wires that are coil ends? I don't understand the 7th wire center tap? in my head I see 12 wires 6 coils that could deliver potentially 20 amps per coil? I will take pictures today

[rosscat3]

rcavictim so that mean that 24 wires would need to be brought out total

[rcavictim]

rcavictim so that mean that 24 wires would need to be brought out total

These poles or coils are wired together in series inside the machine.  Each pole coil you find will be series connected to it's opposite magnetic sense pole located 180 degrees across the big armature hole.  These pole pairs will not work efficiently if separated.  They can however be connected in series or in parallel as sets depending on how much voltage you need.

As to your specific question, IF you were to bring both ends of every single coil out then yes you would have 24 wires.  If you have pairs connected inside the machine frame then you would only be bringing out 12 wires to the outside world.

[mobile_bob]

in a first world genhead that is single phase, each 120 volt leg is comprised of 4 coil groups for a 1800rpm unit
however the chinese ST heads onl use 2 coil groups to power each 120volt leg, that is how we split them for 60volts each.

in a single phase head you bring out all 4 coil groups or 8 wires to reconnect

i don't know, because i haven't opened up an stc 3phase head yet, but my bet is there is only an additional pair of coils added to the
4 coils of an st head, each pair is distributed about the stator with 120 degree's of displacement.

this would make for only 12 wires not 24 wires, that would need to be isolotated, identified and reconnected.

if however the stc actually does have 12 coil sets and therefore 24 wires to isolate , identify and reconnect, that would make each capable
of about 30volts each, which would be a godsend, as this would make the unit capable of being reconnected for either 24 or 48volt charging.

hopefully if the OP has an STC head, he can and will post some pics of the stator.

also, rather than reconnect each coil separately, so that they can be rectified individually, and rather than connect
the groups in delta configuration for 48volt charging, it might be best to reconnect them in wye/star configuration

delta is fine as long as the turn count in each pole coil group is equal, which who knows with the chinese, otherwise if the count
is off a bit there would be circulating currents which will cause heating of the stator and lower efficient,

connected as wye/star configuration eliminates this problem.

anyway my bet is there are only 6coil groups mounted in pairs, displaced 120 degree's from each other, and connected in wye/star config
it is just the easiest way to wind a stator by hand.

either way that stator will operate at 60hz /1800rpm because the rotor has 4 poles.

bob g

[rosscat3]

Hope these pics are clear enough what I have as far as wires brought out are Z1 thru Z7 The following wires have continuity through them Z2-Z3,Z4-Z5,Z5-Z6 .Z7 no idea also U1,U2,U3 and one wire labeled N. hope this helps. Turns out its nothing like I thought it would be
from what I see in the windings are 18 coils of 20 ga wire and 18 goils of14 gauge wire
Thanks Don

[rosscat3]

Sorry should have been wearing my glasses Z2-Z3,Z4-Z5,Z6-Z7 have cont more pics

[rcavictim]

U1,U2,U3 and one wire labeled N.  I believe these are the main output terminals when used normally.  That would be

U1=phase 1

U2= phase 2 or a rock band

U3=phase 3

N= Neutral or the central point of a wye system.  The common point or one side of all three phase windings.

Additionally, you mention heavier and lighter gauge wiring. The first set of coils you see which fill the slots closest to the removed rotor, the lighter gauge wire I believe to be the harmonic excitation windings.

[rosscat3]

 ???So after this surgery what is the best way to reassemble with A60V only battery charging?

[rosscat3]

Just a Update I had to physically remove the stator from the case to find the jumpers they are between the case and the back side of the coils .
from there I will wire the opposite coils in series together then connect in Wye configuration

      Don C