Revision of homemade electric diagram

[Who Dat?]

The FH012 should be a series type (although there's some debate about it) so the stator shouldn't turn crispy... again


Rich82GS750TZ and Who Dat? maybe you can weigh in now the diagram is clear?​

I'll have to take a look at the diagram a bit closer after I get home from work, but felt it necessary to comment on another statement.

​

1. Now we ride the bike: the increased rpm of the engine spins the flywheel around the stator faster, thus making enough power to supply the needs of the bike's loads.
   • Because the output of the stator is now greater than that of the battery, the potential difference (difference in voltage) between them makes the battery a load. It is now being charged.
   • When fully charged, the draw of current will be lower as the battery doesn't "ask" for more and the r/r will lower the voltage to whatever is needed.

The r/r does not lower voltage. It accepts whatever is coming in from the stator, rectifies it to a pulsed DC current, then limits (regulates) it to whatever its setpoint is, usually around 14 volts. As the engine slows down from riding speed, the input voltage is not going to be enough to need regulating, so the voltage does drop, but not because the r/r lowers it.

As you are (hopefully) aware, a shunt-style r/r does its regulating by shunting any excess back through the stator (essentially to ground), meaning that the stator is ALWAYS producing as much as it can. Some of it will get used by lights, ignition, accessories, etc., but the rest is simply wasted. A series-type r/r does its regulation by interrupting the circuit. It does it very quickly, without an oscilloscope it might apear to be steady, but it will actually be a series of pulses, which will average out to whatever the voltage is supposed to be. This means that overall, there is less current going through the stator, allowing it to run cooler.

And, I am not so sure that the FH012 is a series r/r, I belive it is still a shunt-style. Might be a newer MOSFET style, but that is just the type of transistor used in the shunting circuits.

 

[Diirk]

Who Dat? As I already mentioned it's quite unclear (and therefor debated) wether the FH012 is a shunt- or series- R/R, but it's definitely better than whatever was on the bike stock so I'll be content with that. Also, thank you for the clarification on the R/R.

Life got in the way of me progressing with the bike (as well as suddenly ending up with a coveted, for me at least, Inazuma 1200 that needed work done). But I'd still like to get your take on the schematic if you should find the time for it. If the Dutch names for the components are giving you a hard time, I'd be happy to upload another version in English.


Homebrew schematic for the 1979 GS850G

 

[salty_monk]

I’m pretty sure the FH012 is not series. There are only about 3 or 4 units that are.
SH775 being one of them with SH866 allegedly it’s more modern replacement.
The higher spec version is the SH847.

i also thing there is a Polaris numbered unit that is series as well.

Dan