Automotive alternator windings & rectifier

M

Mike Cook

Guest
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.
 
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.
Click to expand...

Photo on p. 18.

and the 8 diode rectifier.

I don't see any 8 diode rectifier.
Click to expand...

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.
Click to expand...

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.
 
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.
Click to expand...

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.
 
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
Click to expand...

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.
 
On 8/19/2013 9:23 PM, Mike Cook wrote:
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.
Click to expand...

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
 
On 8/19/2013 8:23 PM, Mike Cook wrote:
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.
Click to expand...

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

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.)
Click to expand...

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

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.
Click to expand...
 
On 20/08/13 09:23, Mike Cook wrote:
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.
Click to expand...

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

A "Y" = "Wye". "Wye" is just a way of sounding the letter "Y". They are one
and the same.
 
On 2013-08-19, Mike Cook <mcham@NOTyahoo.com> wrote:
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.
Click to expand...

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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