| Author | Message | ||
     Alaskacr |
are the 09/10 12 pole stators failing when used w/ the Compufire or FH012AA rectifiers? Oh, and how many magnets are in the 08 rotor vs the 09/10 rotors? thanks AJ 2010 CR | ||
| Alaskacr |
I have been wondering lately the following: Maybe the stock rectifiers are failing - thus taking out the stator when they do. I have read the same RR was used in the 08s with no problems. But the 09/10s went to a 12 pole stator vs the 18 pole units in the 08s. The 12 pole stators will have an output frequency 50% lower than the 18 pole stators at a given RPM. I also read recently the ECMs are programmed for a relatively high idle as a band-aid for insufficient voltage at idle. I am statrting to suspect the lower frequency of the 12 pole stator might be the culprit, killing the RRs that may have had a minimum frequency input spec suited to 18 pole stators. When the RRs fail, they fail short, overheating the stator until failure. So, anyone have a 12 pole stator that died with the Compufire or FHxxx RRs? | ||
| Jules |
I've never had a VR fail... but have had a stator go. Whilst I suspect that the VR is "marginal" I don't think it is the cause of stator failures any more than any other shunt VR would be (inc the Mossfet ones). It is indeed possible that a failed VR might take the stator with it, but it's more likely that a failing stator would kill the VR - and even then it's not a certainty. | ||
| Alaskacr |
According to http://www.windstuffnow.com/main/3_phase_basics.ht m , "The advantage of star [wye] is the higher voltage at lower rpm..." Are our 12 pole stators Delta or Wye wound? Edit: They are Delta wound. If you were to rewind in a wye config, that would increase voltage output at lower rpms and decrease current. That config should reduce het in the stator too. That might also be the right answer for low rpm charging. Of course if my suspicion about the freq being too low for the stock RR is true, then the stock RR would fail even faster. Either way, going from delta to wye should reduce heat in the stator. (Message edited by alaskacr on October 18, 2011) | ||
| Sparky |
What proof do you have that 1125 stators are delta wound? | ||
| Alaskacr |
Because it only has 3 leads. Wye would have four. EDIT: Ok the more I read, it could be either I guess. A Wye doesn't necessarily have four; instead, the three separate starting ends of each phase are soldered together after the winding is completed. Maybe someone who's had one rewound could chime it. Anyone know how many magnets are in the 08 rotor? How about the 09/10s? (Message edited by alaskacr on October 18, 2011) | ||
| Sparky |
You have a good point re output frequency. I'm sure that would tie in with the fact that the 09-10 stators are 530 watt systems vs 400 watts for the 08s. The result is 6 fewer coils producing more current thus more heat to dissipate with the approx same amount of cooling oil being sprayed onto the coils. It's excessive heat that is presumed to break down the wire's insulation and shorting out. Of course a 532 watt stator would likely overstress a VR designed for a 400 watt system too, don't ya think? | ||
| Alaskacr |
"Of course a 532 watt stator would likely overstress a VR designed for a 400 watt system too, don't ya think?" Yes, especially with a shunt type regulator. I assume a series rectifier wouldn't care though. | ||
| Jules |
I'm not sure the VR was "designed" for a 400W system - it's a reasonably generic part, "designed" for a wide range of outputs, it wasn't specifically designed for the Buell. It may be rated up to 1000W for all we know... Unlikely I know, but it's still just idle speculation.. | ||
| Alaskacr |
Fair enough. I do like your pun though: "idle speculation" AJ | ||
| Crustyxpunk |
I think a lot of it has to do with the placement of the r/r On these. The factory position is bullsh*t especially since it doesn't have fins to help cool it. Every Other bike I have owned has it front and center to maximize cooling. I'm planning on moving mine up by the oil cooler this winter and throwing some fins on it. | ||
| Turbovet |
I like the idea of moving the vr to the oil cooler area. I might try to move the horn and place the vr there. The only problem I see is the distance between the vr and the battery. The wire to the battery will be about 3-4ft long. I think it will make changing the stator and vr easier in the future. | ||
| Bcrawf68 |
My VR failed, but left the stator intact. Voltage started increasing past 16 volts, whereby the display read 'overvoltage' or something like that (CRS!). Anywhey, failed VR caused the wiring loom to overheat, breaking down insulation, burning wires, blowing out bulbs (head, tail, turn signals) and the burning the battery. I too am wondering if anyone has a definitive answer for AlaskaCR's question. | ||
| Rt_performance |
I thought the r/r was the issue I changed to the f00. Smoked 2 stators since r/r still working |
