Today's Message Index:
----------------------
1. 07:01 AM - Re: Data acquisition tools? (Robert L. Nuckolls, III)
2. 09:15 AM - Re: Re: Newbie with PM alternator feed question (Robert L. Nuckolls, III)
3. 03:00 PM - Re: Data acquisition tools? (Paul A. Fisher)
4. 04:34 PM - Re: For Sale: Two Cheltons, EI MVP-50, Pinpoint ADAHRS and Spare (Norm.dewitt)
5. 09:23 PM - Re: Re: Newbie with PM alternator feed question (Robert L. Nuckolls, III)
Message 1
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Subject: | Re: Data acquisition tools? |
At 04:25 PM 6/11/2015, you wrote:
>Thanks Bob. I would be interested if you find your amplifier board
>description. This looks cheap enough to buy just to play with it to
>see what it can do!
You got that right. In fact, even if I can't
find the original (I think it had a d-sub
input and ribbon cable output to my $100
fast-das) I think I'll whip out another version
with a hole pattern that will accept that $15
eBay product.
If your guys are willing to put up the hardware
with wings, I'll put up the electron-pushers.
This is possibly the beginnings of a nice
article for KP.
I've done a lot of this kind of thing . . . on
other people's million dollar airplanes. Given
that I don't have ready access to OBAM aircraft,
it's a rarer opportunity to exploit the trickle-down
possibilities.
Bob . . .
Message 2
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Subject: | Re: Newbie with PM alternator feed question |
At 05:26 PM 6/11/2015, you wrote:
>
>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 . . .
>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
>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.
>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 . . .
Message 3
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Subject: | Re: Data acquisition tools? |
I'm sure we can find "hardware with wings"! I've been chasing hot oil
temperatures lately, so I have a vested interest in this - which is why
I volunteered to investigate tools for our chapter. If we could make a
KP article out of it that would help others, that would be even better!
Let me know how (if) you would like to proceed.
- Paul
On 6/12/2015 6:59 AM, Robert L. Nuckolls, III wrote:
> At 04:25 PM 6/11/2015, you wrote:
>> Thanks Bob. I would be interested if you find your amplifier board
>> description. This looks cheap enough to buy just to play with it to
>> see what it can do!
>
> You got that right. In fact, even if I can't
> find the original (I think it had a d-sub
> input and ribbon cable output to my $100
> fast-das) I think I'll whip out another version
> with a hole pattern that will accept that $15
> eBay product.
>
> If your guys are willing to put up the hardware
> with wings, I'll put up the electron-pushers.
> This is possibly the beginnings of a nice
> article for KP.
>
> I've done a lot of this kind of thing . . . on
> other people's million dollar airplanes. Given
> that I don't have ready access to OBAM aircraft,
> it's a rarer opportunity to exploit the trickle-down
> possibilities.
>
> Bob . . .
>
> *
>
>
> *
Message 4
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Subject: | Re: For Sale: Two Cheltons, EI MVP-50, Pinpoint ADAHRS |
and Spare
Hi Mike,
Is the PinPoint ADAHRS still for sale? What are you asking for it and will you
sell it separate from the Chelton IDUs?
Thanks,
Norm
Norm.dewitt@gmail.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=443442#443442
Message 5
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Subject: | Re: Newbie with PM alternator feed question |
>
>>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.
I've posted a drawing that describes on/off control
of a 3-phase PM alternator with Over Voltage Protection
http://tinyurl.com/n9tottf
Bob . . .
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