---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Mon 02/27/23: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:51 AM - Re: SD-8 Self Exciting via Z25L (Charles Kuss) 2. 04:55 AM - Re: Re: Intermittent Charging (Charles Kuss) 3. 08:32 AM - Re: SD-8 Self Exciting via Z25L (user9253) ________________________________ Message 1 _____________________________________ Time: 04:51:28 AM PST US From: Charles Kuss Subject: Re: AeroElectric-List: SD-8 Self Exciting via Z25L The SD-8 produces power whenever it is moving. The faster it rotates, the more power it creates. The issue is shedding that power [which is converted to heat] when it isn't needed. So max heat is created at normal cruise pow er to max [2700] RPMs, when the unit's power is not required [normal operat ions]. That means you need max ability to shed heat 98% of the time. Better to keep the voltage control device out in the open on a large heat sink [a luminum plate] Classic British motorcycles use this same sort of alternator and voltage co ntrol. Check out the large aluminum plates used to mount the drivers footpe gs in the photo linked below [1975 Norton 850 Commando Mk III] The voltage control devices [Zener diodes] are mounted to the back side of these plates .. Full page fax print (classicbike.biz) On Sunday, February 26, 2023 at 07:38:10 PM EST, andymeyer wrote: > I am setting up the regulator and components from Z25L for a self exciting SD-8 to support backup power for my second ignition and backup power for th e aircraft E-Bus. One option is to screw this stuff to an Aluminum plate and let it hang out in the air - another is to 3D print an enclosure for everything. Question i s how much heat do I have to deal with and what's the fire risk of these co mponents if I have it running full tilt (not likely in my configuration, bu t...) I'm not seeing more than a watt from the resistors if my math is right. How much heat from the regulator and diode bridge? Read this topic online here: http://forums.matronics.com/viewtopic.php?p=510289#510289 - S - WIKI - - =C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin. ________________________________ Message 2 _____________________________________ Time: 04:55:12 AM PST US From: Charles Kuss Subject: Re: AeroElectric-List: Re: Intermittent Charging As a first step, I would remove all the ground wires. Clean the connection s and test the ring terminals physical connection to their wires by pulling on them. A poor ground often causes the symptoms you describe. On Sunday, February 26, 2023 at 06:15:08 PM EST, H. Ivan Haecker wrote: I just saw the response from =9DRadioflyer=9D and will try tha t in a couple of days when the weather improves (and recheck the connection s again).Ivan Haecker On Sun, Feb 26, 2023 at 4:00 PM Radioflyer wrote: et> I think the first thing I would do is to connect a temporary extension wire from the field wire going directly into the alternator into the cabin/cock pit so that you can measure the field Volts. If the field Volts are not nor mal or go too low, then its not the alternator. Bob N. discusses this in hi s book (diag. Z-23) and advises putting a 1k Ohm resistor in this line to l imit any shorting potential. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=510283#510283 - Electric-List" rel="noreferrer" target="_blank">http://www.matronics.co m/Navigator?AeroElectric-List FORUMS - eferrer" target="_blank">http://forums.matronics.com WIKI - errer" target="_blank">http://wiki.matronics.com b Site - =C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin. ="noreferrer" target="_blank">https://matronics.com/contribution ________________________________ Message 3 _____________________________________ Time: 08:32:59 AM PST US Subject: AeroElectric-List: Re: SD-8 Self Exciting via Z25L From: "user9253" It seems that you are saying that the voltage regulator for the SD-8 is a shunt type. Is there any documentation to support that? Most modern voltage regulators for permanent magnet alternators are the switching type. They open the output for part of the AC cycle. The power produced is determined by the connected load, provided that the permanent magnet alternator is spinning fast enough to maintain the voltage. -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=510293#510293 ------------------------------------------------------------------------------------- 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.