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can't I just build my own R/R unit?

  • Thread starter Thread starter Anonymous
  • Start date Start date
One of things that I learned in my research today is some of the bikes, Goldwings in particular do use an automotive style alternator, in that it uses electromagnets instead of permanent ones.
 
the old GT750 suzuki (water buffalo) used a automotive type alternator with a electramagnet instead of regular magnetic rotor.
 
3phase said:
I just cant see how a regular automotive reg will work. It would put out an increasing wattage to be sent to the rotating electromagnet as it detected dropping voltage and would cut back on the wattage as the voltage climbed. It actually does regulate. It controls how much the alternator puts out. The Suz just puts out max all the time and its reg controls the voltage by directing the excess to ground through a zenor gated SCR. I would use a 3 phase full wave rectifier to rectify the total output(all three legs) to begin with. I would then have a zenor discharge into the gate of a nice big SCR which would go to ground. The SCR would need to be heavily finned as it would get hot from the "voltage drop" across it so air flow would be an issue as well perhaps. Good night, will follow your progress and the feedback from others. Your onto a great idea.
Click to expand...

after the scr is activate, what will shut it off???
 
3phase said:
I would use a 3 phase full wave rectifier to rectify the total output(all three legs) to begin with. I would then have a zenor discharge into the gate of a nice big SCR which would go to ground. The SCR would need to be heavily finned as it would get hot from the "voltage drop" across it so air flow would be an issue as well perhaps. Good night, will follow your progress and the feedback from others. Your onto a great idea.
Click to expand...

Isn't this what Mr. Lucas, "The Prince of Darkness", did on his British electical systems?
 
Eric,
There is a web site that has a listing for the components to build you own R/R it also has the art work for the p/c board or you can use a dremmel and carve out your own traces.
you will need to make a heat sink (big) but it has and can be done.
let me know if you need the address and i will dig it up for you
electrical components can last a long, long time or the go POOF in a short while so don't let an old R/R scare you... (e-bayin' i will go.. hiho the merry oh e-bayin' i will go) 20.00 incl shippin"
 
Yes and no. Lucas discharged the excess to ground by zenor alone. In my old 67 bonnie the zenor resides under the headlight in a cool bullet shaped heat sink. Suz (and I think honda but I dont know for sure) are using the zenor to turn on and off an scr. A zenor is like a pressure release valve, Once voltage from the rectifier output hits, in this case, 14.5 volts it starts to let electrons(current) through. In the lucas case to ground imposing an upper limit on the voltage. In the Suzuki case , the zenor discharges into the gate of the scr and causes the scr to start conducting to ground. I assume that an scr is better suited to the heavy lifting. This is all fine except for the odd way Suz chooses to regulate only some of the power. Honda regulates it all and sends it to the fuse box for distribution. Yes, I came across a yamaha 650 twin a few weeks ago that had a fully regulatable alternator. A much better system when it works but hardly simple involving slip rings and brushes. Simple is good. Having had zero trouble with my 83 gs 1100 charging system, I am not fully knowledgable beyond reading this forum and puzzling over the schematic in my manual. I keep my battery full of electrolyte and my engine topped right up with oil. Its a good old bike
 
jimcor said:
3phase said:
I would use a 3 phase full wave rectifier to rectify the total output(all three legs) to begin with. I would then have a zenor discharge into the gate of a nice big SCR which would go to ground. The SCR would need to be heavily finned as it would get hot from the "voltage drop" across it so air flow would be an issue as well perhaps. Good night, will follow your progress and the feedback from others. Your onto a great idea.
Click to expand...

Isn't this what Mr. Lucas, "The Prince of Darkness", did on his British electical systems?
Click to expand...

Not quite, there was no SCR, just a big zener diode fitted with cooling fins. It was mounted under the headlight to give it some airflow. Not a great design at standstill though!
 
Someone posted an Adobe file with a schematic about one or two months ago. I had it, but when my computer fouled up, it was gone.
 
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