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Automotive alternator windings & rectifier

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Mike Cook
Guest

Mon Aug 19, 2013 10:17 pm   



http://www.autoshop101.com/forms/alt_bwoh.pdf

has photos of an alternator with 4 connections for windings (each of 3 phases
+ common), and the 8 diode rectifier. But wiring diagrams show only 3
connections and 6 diodes.

Where does the common winding terminal connect (there is a connection on the
rectifier plate)? Where do the other 2 diodes connect?

I handled one of these disassembled units but didn't have time to ohm out the
connections.

Thanks.

Mike Cook
Guest

Tue Aug 20, 2013 7:23 am   



Quote:
http://www.autoshop101.com/forms/alt_bwoh.pdf

has photos of an alternator with 4 connections for windings (each of 3
phases + common),

Not one of the pages shows four connections brought out from the
windings.


Photo on p. 18.

Quote:
and the 8 diode rectifier.

I don't see any 8 diode rectifier.


Photo on p. 25. Note callouts for 6 diodes but you can see 8 round circles --
those are the diodes. Eight. (And yes, I've seen the rectifier and each of
the 8 have leads soldered to each bus (or something...). I can confirm that
firsthand.)

My conundrum remains:

Quote:
But wiring diagrams show only 3 connections and 6 diodes.

Where does the common winding terminal connect (there is a connection on the
rectifier plate)? Where do the other 2 diodes connect?

Common is created by the way the diodes are connected. >THAT< common is
connected to the auto frame.


By "common" are you referring to the (-) terminal? We agree that that
terminal goes to chassis (presuming neg. ground chassis).

I'm talking about the common point among all 3 windings -- the center
terminal of the "Y" configuration.

> Would you ask your question again and maybe clarify the situation?

There ya' go...

Thanks.

Mike Cook
Guest

Tue Aug 20, 2013 7:30 am   



Quote:
Photo on p. 25. Note callouts for 6 diodes but you can see 8 round circles
--
those are the diodes. Eight. (And yes, I've seen the rectifier and each of
the 8 have leads soldered to each bus (or something...). I can confirm that
firsthand.)

I'll take that as so, but I don't see it.


http://oi44.tinypic.com/n6s3k3.jpg

The 4th positive diode is a circle, just visible. The negative diodes are on
the flip side of the rectifier so only the solder joints of the diode leads
are visible as square tabs.

The 4 connections for the 4 winding terminals (3 windings + the common) are
are around the periphery of the rectifier plate (only 2 called out, labeled
"stator taps" in the original PDF reference).

Thanks for looking.

Mike Cook
Guest

Tue Aug 20, 2013 7:30 am   



Quote:
The + and - from the six diodes is connected to a series pair of
diodes. The junction of that pair goes to the neutral junction
of the stator coils and the regulator. Like this:

+ --->|---+--->|--- -


Neutral Junction-+->to regulator

See
http://autonopedia.org/renewable-ene...nator-secrets/

Ed


Thanks Ed. I see that there are 2 additional figures:

ALTERNATOR WITH NEUTRAL SAMPLING CIRCUIT

which shows use of 8 diodes, and

ALTERNATOR WITH STATOR COIL SAMPLING CIRCUIT

which shows use of 9 diodes.

Appreciate your pointing out this web page. Thanks.

ehsjr
Guest

Tue Aug 20, 2013 7:30 am   



On 8/19/2013 9:23 PM, Mike Cook wrote:
Quote:
http://www.autoshop101.com/forms/alt_bwoh.pdf

has photos of an alternator with 4 connections for windings (each of 3
phases + common),

Not one of the pages shows four connections brought out from the
windings.

Photo on p. 18.

and the 8 diode rectifier.

I don't see any 8 diode rectifier.

Photo on p. 25. Note callouts for 6 diodes but you can see 8 round circles --
those are the diodes. Eight. (And yes, I've seen the rectifier and each of
the 8 have leads soldered to each bus (or something...). I can confirm that
firsthand.)

My conundrum remains:

But wiring diagrams show only 3 connections and 6 diodes.

Where does the common winding terminal connect (there is a connection on the
rectifier plate)? Where do the other 2 diodes connect?

Common is created by the way the diodes are connected. >THAT< common is
connected to the auto frame.

By "common" are you referring to the (-) terminal? We agree that that
terminal goes to chassis (presuming neg. ground chassis).

I'm talking about the common point among all 3 windings -- the center
terminal of the "Y" configuration.

Would you ask your question again and maybe clarify the situation?

There ya' go...

Thanks.


The + and - from the six diodes is connected to a series pair of
diodes. The junction of that pair goes to the neutral junction
of the stator coils and the regulator. Like this:

+ --->|---+--->|--- -
|
|
Neutral Junction-+->to regulator

See
http://autonopedia.org/renewable-energy/generators/alternator-secrets/

Ed

amdx
Guest

Tue Aug 20, 2013 7:30 am   



On 8/19/2013 8:23 PM, Mike Cook wrote:
Quote:
http://www.autoshop101.com/forms/alt_bwoh.pdf

has photos of an alternator with 4 connections for windings (each of 3
phases + common),

Not one of the pages shows four connections brought out from the
windings.

Photo on p. 18.

and the 8 diode rectifier.


You're right, I'm wrong. I see the four a little hidden by the picture
angle.

Quote:
I don't see any 8 diode rectifier.

Photo on p. 25. Note callouts for 6 diodes but you can see 8 round circles --
those are the diodes. Eight. (And yes, I've seen the rectifier and each of
the 8 have leads soldered to each bus (or something...). I can confirm that
firsthand.)


I'll take that as so, but I don't see it.

Quote:
My conundrum remains:

But wiring diagrams show only 3 connections and 6 diodes.

Where does the common winding terminal connect (there is a connection on the
rectifier plate)? Where do the other 2 diodes connect?

Common is created by the way the diodes are connected. >THAT< common is
connected to the auto frame.

By "common" are you referring to the (-) terminal? We agree that that
terminal goes to chassis (presuming neg. ground chassis).

I'm talking about the common point among all 3 windings -- the center
terminal of the "Y" configuration.

Would you ask your question again and maybe clarify the situation?

There ya' go...

Thanks.


Rheilly Phoull
Guest

Tue Aug 20, 2013 7:30 am   



On 20/08/13 09:23, Mike Cook wrote:
Quote:
http://www.autoshop101.com/forms/alt_bwoh.pdf

has photos of an alternator with 4 connections for windings (each of 3
phases + common),

Not one of the pages shows four connections brought out from the
windings.

Photo on p. 18.

and the 8 diode rectifier.

I don't see any 8 diode rectifier.

Photo on p. 25. Note callouts for 6 diodes but you can see 8 round circles --
those are the diodes. Eight. (And yes, I've seen the rectifier and each of
the 8 have leads soldered to each bus (or something...). I can confirm that
firsthand.)

My conundrum remains:

But wiring diagrams show only 3 connections and 6 diodes.

Where does the common winding terminal connect (there is a connection on the
rectifier plate)? Where do the other 2 diodes connect?

Common is created by the way the diodes are connected. >THAT< common is
connected to the auto frame.

By "common" are you referring to the (-) terminal? We agree that that
terminal goes to chassis (presuming neg. ground chassis).

I'm talking about the common point among all 3 windings -- the center
terminal of the "Y" configuration.

Would you ask your question again and maybe clarify the situation?

There ya' go...

Thanks.


afaik the common of the 'Y' does not connect anywhere else.
To do so would make it a "Wye" setup.

Fester Bestertester
Guest

Tue Aug 20, 2013 1:09 pm   



Quote:
afaik the common of the 'Y' does not connect anywhere else.
To do so would make it a "Wye" setup.


A "Y" = "Wye". "Wye" is just a way of sounding the letter "Y". They are one
and the same.

Jasen Betts
Guest

Tue Aug 20, 2013 5:19 pm   



On 2013-08-19, Mike Cook <mcham_at_NOTyahoo.com> wrote:
Quote:
http://www.autoshop101.com/forms/alt_bwoh.pdf

has photos of an alternator with 4 connections for windings (each of 3 phases
+ common), and the 8 diode rectifier. But wiring diagrams show only 3
connections and 6 diodes.

Where does the common winding terminal connect (there is a connection on the
rectifier plate)? Where do the other 2 diodes connect?

I handled one of these disassembled units but didn't have time to ohm out the
connections.

Thanks.


common to the chassis
3 big diodes to battery positive
3 small diodes to the altenator regulator
another small diode between the regulator and the altenator light,

eigth diode, dunno.





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elektroda.net NewsGroups Forum Index - Electronics Equipment - Automotive alternator windings & rectifier

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