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nuckolls.bob(at)aeroelect
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 Posted: Sun Dec 12, 2021 10:54 am Post subject: Monkworkz MZ-30L, 2.6 lb 30 amp generator |
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At 07:20 AM 12/12/2021, you wrote:
| Quote: | 'Someone' should have mentioned that this list/forum is an advertising-free
zone. I wasted 5 valuable minutes of my life thinking I might be able to help you with a problem.
Get BlueMail for Android
On Dec 12, 2021, at 1:07 AM, bigginsking <bjudge(at)gmail.com (bjudge(at)gmail.com)> wrote:
| Quote: | --> AeroElectric-List message posted by:
"bigginsking" <bjudge(at)gmail.com>
Greetings,
Someone was kind enough to let me know I should post something on
this forum about my new generator.
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<snip>
Don't know that his post is so much 'advertising' as it is
| Quote: | useful information for future planning. This product
is a
contemporary offspring of the PM 'dynamo' style alternators.
A sibling of the family of alternators launched into OBAM
Aircraft by B&C back in the dark ages.
This device has the look and smell of having benefited from
a lot of thought and hard work. It's a 3-phase machine which
gives it a leg up on watts/cu-cm. Also, it no doubt
benefits from some improvements in magnetics. The addition
of forced air cooling suggests a trade-off for using
more turns of smaller wire to improve low rpm
performance at the expense of heat rejection in wires
that drive the cooling requirement. It's compact
size will also call for increased attention to
cooling.
Note: back in the early days of shift from vacuum
tubes to transistors, many installers were somewhat
perplexed by the need for cooling plenums on a full
stack of new radios. While the new kids did
use less energy from the bus, they were also MUCH
more compact . . . i.e. watts/cu-cm was often as
high in a solid state radio as some tube types.
The transistors back then were less tolerant of
high temperatures too . . . a condition that pretty
much disappeared.
The supporting literature seems well crafted. The
only thing I missed was an RPM vs. available current
at bus voltage.
I note a feature in the regulator for sensing internal
temperature of the alternator. I'm guessing it's
to effect protective shut down or dial-back of output
current in rare cases of low cooling air and high
current draw. The rectifier/regulator also offers
some interesting system integration features.
This 'new kid' on the block seems worthy of your
consideration for configuring your ship's hardware.
If anyone has personal observations or knowledge
about this product's induction into the society
of civilized aircraft systems, please share them
with the group!
Bill, thanks for the heads-up! No sweat Charlie
. . . 'he done good'.
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Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
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bigginsking
Joined: 25 Sep 2012
Posts: 27
Location: San Diego, California
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| Posted: Sun Dec 12, 2021 4:55 pm Post subject: Re: Monkworkz MZ-30L, 2.6 lb 30 amp generator |
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Thanks Bob!
For sure using neodymium magnets rather than ferrite makes the power density higher. The next issue is handling the variable voltage from the generator, and thanks to advancements in power electronics that is something that can be done now at a scale that is interesting for this application.
Below 1800 RPM it will current limit at 15 amps, it does this by reducing the output voltage. At ~1000 RPM you can get around 15 amps, but maybe at 13.5V, at around 1100 or so you will get 15 amps. Over 1800 RPM it will limit at 30 amps.
The thermistor on the generator serves as a "guard rail" to prevent destroying the device if the cooling isn't installed as directed by the installation manual. there are also three thermistors on the circuit board of the regulator as well.
Happy to answer any questions.
Thanks,
Bill
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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_________________
Bill Judge
N84WJ, RV-8 |
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nuckolls.bob(at)aeroelect
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| Posted: Tue Dec 14, 2021 8:43 am Post subject: Monkworkz MZ-30L, 2.6 lb 30 amp generator |
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At 06:33 AM 12/14/2021, you wrote:
| Quote: | EMF would depend on the number of field lines cut by the coils per second, not any linear speed; whether the magnets are on the inside or the outside the field lines cut per revolution would be the same.
Maybe there's room for bigger magnets on the outside? But then there's room for fewer coil turns. |
Yes, larger magnets that produce MORE lines
for given flux density. Optimum turns will
be an exceedingly interactive trade off for
volume and core magnetics. The steel on which
the coils are situation is part of the flux
path. The steel is limited in how many lines
of flux it will carry. If the steel is being
operated high on it's saturation curve (desirable)
then going to bigger magnets may not proportionately
increase energy available from the machine.
The housing on which carries the magnets
may also be a critical part of the magnetic
circuit depending on the polarity configuration
of the magnets.
The performance of rotating electrics is driven
by a symphony of effects which interact with
each other any one of which can become a singular
limit . . . fine tuning these critters is an
art aided by nimble footed software!
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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