Subject: [FlyRotary] Re: Racemate alt/water pump

> That's why I'm interested in this PM generator. Looks nearly 100% bullet
> proof, especially with redundant rectifiers and regulators isolated with
> switches from the coils (at which point the switches become the weak link).
>
> It appeared to me the primary mechanical failure would be the mags,
> unless some resonant frequncy could break off the stators or coils.
>
> Finn
>
> Ernest Christley wrote:
>
> > Finn Lassen wrote:
> >
> >> I was looking for possible failure modes. We know that alternators
> >> fail. What would be the possible fairure modes of this PM generator -
> >> other than rectifiers, and series voltage regulator?
> >> Alternators failures: rectifiers, bearings, brushes, ?
> >> The envisioned PM generator would have which possible mechanical
> >> failure modes?
> >>
> >> Finn
> >>
> > -No bearings.  In fact, if installed properly, no moving parts (at
> > least in the sense that parts are rubbing against one another).  The
> > stator bolts to something solid and doesn't (shouldn't) move relative
> > to the mounting.  The rotor bolts to a shaft and doesn't (shouldn't)
> > move relative to the mounting.
> >> >
> > In the final analysis, the PM alternator is just a simpler design that
> > does the job very well.  Standard alternators were made more
> > complicated due to the operating environment, and along with that
> > complexity comes  a list of failure modes.  Even though the modern
> > alternator is very robust, it'd be nice to leave that list on the ground.
> I haven't chimed in on this yet (was down in Texas for 3 days and had 288 messages to go thru).Looks inviting to not need the belted alt. However, if you cruise at 4500RPM will it still put out adequate voltage.  Someone mentioned that at a 6000 RPM cruise the output would only then be sufficient to supply the load and charge the bat.