---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Fri 06/12/15: 5 ---------------------------------------------------------- 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 _____________________________________ Time: 07:01:46 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: 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 _____________________________________ Time: 09:15:15 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: 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 _____________________________________ Time: 03:00:43 PM PST US From: "Paul A. Fisher" Subject: Re: AeroElectric-List: 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 _____________________________________ Time: 04:34:24 PM PST US Subject: AeroElectric-List: Re: For Sale: Two Cheltons, EI MVP-50, Pinpoint ADAHRS and Spare From: "Norm.dewitt" 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 _____________________________________ Time: 09:23:02 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: 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 . . . ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.