Inverter question for Jim Weir

On Fri, 13 Feb 2004 19:43:56 -0800, "Tarver Engineering"
wrote:


clare @ snyder.on .ca wrote in message
.. .
On Fri, 13 Feb 2004 08:03:34 -0800, "Tarver Engineering"
wrote:


"RU ok" wrote in message
.. .
On Thu, 12 Feb 2004 22:28:52 -0800, Jim Weir wrote:

snip of senile old fool

You mean the alternator on my car isn't
three phase furnishing DC to charge the battery"?

Yes, it is.

It is a 3 phase AC machine - the rectifiers make DC - which is DC no
mater how you slice it and dice it, and no matter what you roll it in.

Actually, no, but I'll let you ponder on the rest of the circuit.

PLONK

I suppose if you want to be fussy, the DC will be lumpy every 120 degrees,
but hey, thats what lead acid batteries like being charged by....

Cam..

You mean the alternator on my car isn't
three phase furnishing DC to charge the battery"?

Yes, it is.

It is a 3 phase AC machine - the rectifiers make DC - which is DC no
mater how you slice it and dice it, and no matter what you roll it in.

Actually, no, but I'll let you ponder on the rest of the circuit.

PLONK

"Cam" wrote in message
...
I suppose if you want to be fussy, the DC will be lumpy every 120 degrees,
but hey, thats what lead acid batteries like being charged by....

Rectified three phase into a battery makes a quiet DC source.

I believe it is only 60° "lumpiness" as there are 6 diodes in the full wave
rectifying bridge.

"Cam" wrote in message
...
I suppose if you want to be fussy, the DC will be lumpy every 120 degrees,
but hey, thats what lead acid batteries like being charged by....

Cam..

You mean the alternator on my car isn't
three phase furnishing DC to charge the battery"?

Yes, it is.

It is a 3 phase AC machine - the rectifiers make DC - which is DC no
mater how you slice it and dice it, and no matter what you roll it
in.

Actually, no, but I'll let you ponder on the rest of the circuit.

PLONK

True.

Cam

"Cy Galley" wrote in message
news:CNMXb.312257$I06.3161934@attbi_s01...
I believe it is only 60° "lumpiness" as there are 6 diodes in the full
wave
rectifying bridge.

"Cam" wrote in message
...
I suppose if you want to be fussy, the DC will be lumpy every 120
degrees,
but hey, thats what lead acid batteries like being charged by....

Cam..

"Tarver Engineering" wrote in message
...

"Cam" wrote in message
...
I suppose if you want to be fussy, the DC will be lumpy every 120
degrees,
but hey, thats what lead acid batteries like being charged by....

Rectified three phase into a battery makes a quiet DC source.



No, not that quiet. Otherwise we wouldn't have "alternator whine." And
there is a "bump" every 60 degrees (full wave rectification). However, due
to the higher frequency of the ripple, 3 phase is easier to filter to make
pure DC. I imagine that's what everyone here means to say?