nuckolls.bob(at)aeroelect
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 Posted: Fri Jun 12, 2015 8:15 am Post subject: Newbie with PM alternator feed question |
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At 05:26 PM 6/11/2015, you wrote:
| Quote: | --> AeroElectric-List message posted by: "blues750" <den_beaulieu(at)yahoo.com>
Thanks Bob...more confused and curious now.
The system is described as a permanent magnet 3-phase alternator with a simple and reliable shunt type of regulator with fail safe characteristics. They further state "the thyristors in the shunt regulator actually short the generator windings to ground (dump the load) in a pulsating like fashion..."
What class of of R/R and Alternator do I have? Or, better yet, what is the accurate way to refer to my system. |
That 'series' and 'shunt' thing is subject to
interpretation and mis-understanding borne
of arcane technologies and low information
consumerism . . .
Indeed, the first r/r systems installed on small
alternators were "shunt" regulated in the sense
that when the system votlage was high enough, an
silicon controlled rectifier was triggered to place
a nearly dead short on the alternator's output.
Simple, effective and VERY inefficient. This system
placed the alternator under a 100%, worse than
full load. The alternator had to be designed to
tolerate the 'abuse' by making sure that
it was adequately cooled . . . okay for running
the headlight on a mini-bike.
As the power output of the PM alternator went
up to accommodate increased system demands,
the dead-short-shunt technique became impractical
but the term 'shunt' style regulator sorta
hung on although it could NOT be configured
to operate like it's ancestors . . .
| Quote: | | Not sure what a series switched R/R is with respect to my system. Should I consider changing out my R/R for any reason? |
No
| Quote: | | Trying to determine how to best (if required) implement a disconnect of some sort in the event an over voltage condition occurs. |
That drawing I referenced illustrates a methodology
for disconnecting the AC power from the R/R with
a relay controlled by the crew for normal on/off
control of the alternator . . . a relay that could
also be opened by operation of a crowbar over votlage
detection module.
In the case of a 3-phase alternator, you need to open
TWO of the three leads . . . the single phase can be
shut down by opening ONE of the two leads.
| Quote: | | Trying to sort things out as I proceed and appreciate this forum and your literature! |
Pleased that you find it useful. I need to take
care of some other pressing business. I'll see if I
can sketch a diagram of what I've described above
and post it later today.
Bob . . . [quote][b]
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