550 seca MOSFET upgrade

So one of the guys at work gave me a shindengen MOSFET reg/Rec that he had. He said it would improve my electrical, because it does not shunt the extra power as heat. Just wondering if anyone has done this to their bike. And of course any photos or tips would be greatly appreciated.

 

looks like a good upgrade if ever my r/r should cease to function.

i guess its just plug and play

found this online

 

Yup that's the one. Now all I have to figure out is how to put it on the bike.

 

Your stock regulator/rectifier doesn't shunt extra power as heat either.

The XJ uses a field coil and the regulator rectifier controls the field coil voltage to generate exactly the correct amount of power.

The schematic from venlis is of a permanent magnet alternator. Not what's on the XJ.

 

had to dig this up.

so micarl are you saying it wouldnt work on our xj's?

i have stumbled on this product again and word is (quote) "You can install this unit on your Triumph Sprint, S3, Daytona, TT600, Tiger; Suzuki TL, SV 650, SV1K;
or indeed ANY bike that has discreet three-phase stator and R/R arrangement."

 

It could PROBABLY be made to work but would require someone brave to try it.

AS MIcarl says, most XJ's use an alternator that varies the strength of the alternator field although later models - like my old XJ600 and the "SecaII" models use a permanent magnet alternator and a rectifier/regulator like the one in the picture.

What you would have to do is find a way to pass a current through the field equal to that of a normal regulator, when the battery is at 12volts, ie delivering maximum field strength.


What you want is a trusty XJer to get you that info with a DC current clamp meter. If the current is not too high perhaps some high power wirewound resistors would do the job. Use the existing brown wire for the supply as this is only on with the ignition - otherwise your battery will go flat! Connect the green wire to the chassis.

Now the new RR should regulate the outputs via the mosfets.

It sounds like quite a lot of work to be honest and you wouldn't gain much (You'd still have brushes to maintain) It would be worth doing if standard regulators werent avaiable anymore!

I can only think of old BSA and Triumph bikes which used a zener diode to dump excess power as heat!!!

PS: apologies for replying to a resurected post!

 

And Norton, Matchless', AJS' they all used it. Probably because there wasn't all that much "extra" needing to be dumped.

But the HEAT SINK was so cool! (Except the Norton Commando that just used one of the alloy sideplates as its heatsink.)

 

We're back to Joe Lucas - the prince of darkness!!!!

 

I wouldn't trust one of them, there is still a volt drop on the transistors, and that will still generate heat. Transistors can't handle the high currents a thyristor can. Plus the current dumping thyristors are not constantly shorting it out, its very rapid cycling.

The regs that dump to ground are under less load when you increase the electrical load, these will be the other way round.

I'm working on an 80%+ efficient regulator that will give off very little heat and will waste very little of the alternators output

 

i have no ****ing idea what all of you just said

 

Over here, rumour has it that you folks drink warm beer because you have Lucas refrigerators...

 

DAMN! Never understood the warm beer thing either but this theory makes since.

 

It's an old English tradition, to keep the beer in the sideboard. Don't knock it, the Brits are doing their bit to combat climate change.

 

I used to work for a brewery - Greene King - and the town I live in has two large USAF bases in the surrounding area, so maybe there is a chance that some forum members will have sampled their beers especially "Abbot ale" which certainly separates the men from the boys!!!

I agree "ales" can be an aquired taste but they shold not be served warm!

As well as a brewery, the town has the ruins of a large monestary. Because the water was of poor quality, the monks brewed ale. They were allowed 6 pints per day....unless they were ill, when they were allowed 12...........

This is a bit off topic I know!