On Wed, 29 Dec 2004 17:55:16 -0600, itoldyouiamnotiamnotgeorge
wrote in
:

Frank Gilliland wrote in
:

Current equalizing resistors is another way to do it. It's common
practice in SS audio amps to use emitter resistors to equalize the
currents between parallel transistors. But I would hesitate using them
with modern alternators because I don't know how it would screw with
the regulators -- some have a local sense line and others have a
remote sense line -- a resistor in the load might send the regulator
into seizures.


Frank it is very easy a single regulator will control the field voltage on
both alternators. This way they would run the same and share the "Load"


I thought about that, but wouldn't the rotors need to be locked in
phase?

Frank Gilliland wrote:

On Wed, 29 Dec 2004 17:55:16 -0600, itoldyouiamnotiamnotgeorge
wrote in
:

Frank Gilliland wrote in
m:

Current equalizing resistors is another way to do it. It's common
practice in SS audio amps to use emitter resistors to equalize the
currents between parallel transistors. But I would hesitate using them
with modern alternators because I don't know how it would screw with
the regulators -- some have a local sense line and others have a
remote sense line -- a resistor in the load might send the regulator
into seizures.


Frank it is very easy a single regulator will control the field voltage
on
both alternators. This way they would run the same and share the "Load"


I thought about that, but wouldn't the rotors need to be locked in
phase?

Phase? The control voltage is DC, the output is DC, am I missing something?
Wouldn't you just want the outputs to be at the same level?

On Thu, 30 Dec 2004 14:59:40 GMT, Lancer wrote in
:

Frank Gilliland wrote:

On Wed, 29 Dec 2004 17:55:16 -0600, itoldyouiamnotiamnotgeorge
wrote in
:

Frank Gilliland wrote in
:

Current equalizing resistors is another way to do it. It's common
practice in SS audio amps to use emitter resistors to equalize the
currents between parallel transistors. But I would hesitate using them
with modern alternators because I don't know how it would screw with
the regulators -- some have a local sense line and others have a
remote sense line -- a resistor in the load might send the regulator
into seizures.


Frank it is very easy a single regulator will control the field voltage
on
both alternators. This way they would run the same and share the "Load"


I thought about that, but wouldn't the rotors need to be locked in
phase?

Phase? The control voltage is DC, the output is DC, am I missing something?


The control (field) current is fluctuating DC, isn't it? Isn't that
how the regulator smooths the output (which would be fluctuating DC if
the field current was steady)?


Wouldn't you just want the outputs to be at the same level?


That's the plan. But regulators are like little kids with a new toy.
When you put two or more regulators in parallel (without current
equalizing resistors) it's almost impossible to make them share the
load equally.

On Wed, 29 Dec 2004 16:17:01 -0800, Frank Gilliland
wrote:

On Wed, 29 Dec 2004 17:55:16 -0600, itoldyouiamnotiamnotgeorge
wrote in
:

Frank Gilliland wrote in
m:

Current equalizing resistors is another way to do it. It's common
practice in SS audio amps to use emitter resistors to equalize the
currents between parallel transistors. But I would hesitate using them
with modern alternators because I don't know how it would screw with
the regulators -- some have a local sense line and others have a
remote sense line -- a resistor in the load might send the regulator
into seizures.


Frank it is very easy a single regulator will control the field voltage on
both alternators. This way they would run the same and share the "Load"


I thought about that, but wouldn't the rotors need to be locked in
phase?


Phase? The control voltage is DC, the outputs are DC, am I missing
something? I know that the output of an alternator isn't "pure' DC,
but it will never be 180 degrees out.

On Thu, 30 Dec 2004 16:46:42 GMT, Lancer wrote in
. com:

On Wed, 29 Dec 2004 16:17:01 -0800, Frank Gilliland
wrote:

On Wed, 29 Dec 2004 17:55:16 -0600, itoldyouiamnotiamnotgeorge
wrote in
:

Frank Gilliland wrote in
:

Current equalizing resistors is another way to do it. It's common
practice in SS audio amps to use emitter resistors to equalize the
currents between parallel transistors. But I would hesitate using them
with modern alternators because I don't know how it would screw with
the regulators -- some have a local sense line and others have a
remote sense line -- a resistor in the load might send the regulator
into seizures.


Frank it is very easy a single regulator will control the field voltage on
both alternators. This way they would run the same and share the "Load"


I thought about that, but wouldn't the rotors need to be locked in
phase?


Phase? The control voltage is DC, the outputs are DC, am I missing
something? I know that the output of an alternator isn't "pure' DC,
but it will never be 180 degrees out.


Auto alternators are three-phase alternators. As such, the rectified
output never drops to zero, but it does have significant ripple. The
regulator obviously controls the DC component. So I guess the question
is if the regulator also smooths the ripple. If it does then parallel
alternators must be locked in phase. But if it just controls the DC
component then current equalizing resistors will do the job (although
I would think about putting a ripple filter on the sense lines).

"Lancer" wrote in message
ews.com...
On Wed, 29 Dec 2004 16:17:01 -0800, Frank Gilliland
wrote:

On Wed, 29 Dec 2004 17:55:16 -0600, itoldyouiamnotiamnotgeorge
wrote in
:

Frank Gilliland wrote in
:

Current equalizing resistors is another way to do it. It's common
practice in SS audio amps to use emitter resistors to equalize the
currents between parallel transistors. But I would hesitate using them
with modern alternators because I don't know how it would screw with
the regulators -- some have a local sense line and others have a
remote sense line -- a resistor in the load might send the regulator
into seizures.


Frank it is very easy a single regulator will control the field voltage
on
both alternators. This way they would run the same and share the "Load"


I thought about that, but wouldn't the rotors need to be locked in
phase?


Phase? The control voltage is DC, the outputs are DC, am I missing
something? I know that the output of an alternator isn't "pure' DC,
but it will never be 180 degrees out.

Alternators deliver 3 phase, approximately 120 volts output at working RPM.

U Know Who wrote:


"Lancer" wrote in message
ews.com...
On Wed, 29 Dec 2004 16:17:01 -0800, Frank Gilliland
wrote:

On Wed, 29 Dec 2004 17:55:16 -0600, itoldyouiamnotiamnotgeorge
wrote in
:

Frank Gilliland wrote in
m:

Current equalizing resistors is another way to do it. It's common
practice in SS audio amps to use emitter resistors to equalize the
currents between parallel transistors. But I would hesitate using them
with modern alternators because I don't know how it would screw with
the regulators -- some have a local sense line and others have a
remote sense line -- a resistor in the load might send the regulator
into seizures.


Frank it is very easy a single regulator will control the field voltage
on
both alternators. This way they would run the same and share the "Load"


I thought about that, but wouldn't the rotors need to be locked in
phase?


Phase? The control voltage is DC, the outputs are DC, am I missing
something? I know that the output of an alternator isn't "pure' DC,
but it will never be 180 degrees out.

Alternators deliver 3 phase, approximately 120 volts output at working
RPM.

Yes I know that, The output (at least on most automotive applications is
DC.)
I have seen modifed alternators with 3 transformers on them to provide
higher voltages for B+ for transmitters.

On Fri, 31 Dec 2004 00:40:51 GMT, Lancer wrote:

U Know Who wrote:


"Lancer" wrote in message
ews.com...
On Wed, 29 Dec 2004 16:17:01 -0800, Frank Gilliland
wrote:

On Wed, 29 Dec 2004 17:55:16 -0600, itoldyouiamnotiamnotgeorge
wrote in
:

Frank Gilliland wrote in
om:

Current equalizing resistors is another way to do it. It's common
practice in SS audio amps to use emitter resistors to equalize the
currents between parallel transistors. But I would hesitate using them
with modern alternators because I don't know how it would screw with
the regulators -- some have a local sense line and others have a
remote sense line -- a resistor in the load might send the regulator
into seizures.


Frank it is very easy a single regulator will control the field voltage
on
both alternators. This way they would run the same and share the "Load"


I thought about that, but wouldn't the rotors need to be locked in
phase?


Phase? The control voltage is DC, the outputs are DC, am I missing
something? I know that the output of an alternator isn't "pure' DC,
but it will never be 180 degrees out.

Alternators deliver 3 phase, approximately 120 volts output at working
RPM.

Yes I know that, The output (at least on most automotive applications is
DC.)
I have seen modifed alternators with 3 transformers on them to provide
higher voltages for B+ for transmitters.

BTW Randy, I wasn't trying to be a smart ass with my answer.

"Lancer" wrote in message
ews.com...
On Fri, 31 Dec 2004 00:40:51 GMT, Lancer wrote:

U Know Who wrote:


"Lancer" wrote in message
ews.com...
On Wed, 29 Dec 2004 16:17:01 -0800, Frank Gilliland
wrote:

On Wed, 29 Dec 2004 17:55:16 -0600, itoldyouiamnotiamnotgeorge
wrote in
:

Frank Gilliland wrote in
news:q9i5t09kfa8oceo2bsc8sp2fri7hl2d4bo@4ax. com:

Current equalizing resistors is another way to do it. It's common
practice in SS audio amps to use emitter resistors to equalize the
currents between parallel transistors. But I would hesitate using
them
with modern alternators because I don't know how it would screw with
the regulators -- some have a local sense line and others have a
remote sense line -- a resistor in the load might send the regulator
into seizures.


Frank it is very easy a single regulator will control the field
voltage
on
both alternators. This way they would run the same and share the
"Load"


I thought about that, but wouldn't the rotors need to be locked in
phase?


Phase? The control voltage is DC, the outputs are DC, am I missing
something? I know that the output of an alternator isn't "pure' DC,
but it will never be 180 degrees out.

Alternators deliver 3 phase, approximately 120 volts output at working
RPM.

Yes I know that, The output (at least on most automotive applications is
DC.)
I have seen modifed alternators with 3 transformers on them to provide
higher voltages for B+ for transmitters.

BTW Randy, I wasn't trying to be a smart ass with my answer.

I didn't take it that way. NP!