Today's Message Index:
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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
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| Subject: | Re: 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 <meyerkc135@
gmail.com> 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?
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http://forums.matronics.com/viewtopic.php?p=510289#510289
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Message 2
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| Subject: | 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 <hivan
haecker@gmail.com> 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 <skyeyecorp@airpost.net> 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.
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Message 3
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| Subject: | Re: SD-8 Self Exciting via Z25L |
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
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