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Kelly, this is nothing more than a SWAG, but one of the
larger motor had these specs
Monster Power 160 (63M57)
It could handle 2700 watts.
At 16 Volts it would take 2700/16 = 168 amps input
to generate 2700 watts.
So even if you assume it was only 50 % as effective as an
alternator and after the voltage drop you would get across the diode array, it
would appear
that 60 Amps at 13 volts would not be too wild a
guess. These motor wind at high rpms but then so doe our
alternators.
My main concern would be whether these motor using for
relative short duration flights - would provide the mechanical reliability at
hours, days, weeks, months, years of high continous rpm. I don't
think the electronics would be a problem, but not as comfortable
about
1. Mechanical reliability under the stress (hot
engine compartments, hours of high rpm running)
2. Cooling mechanism - I don't see any cooling fans
like an auto alternator
But must admit 22 oz and 2.5 inches in diameter would sure
make them attractive for aircraft use if my concerns are invalid
Ed
Sent: Tuesday, October 05, 2010 6:39 PM
Subject: [FlyRotary] Re: Permanent Magnet
Alternators
Lynn,
Any idea what amp output would be for your motor
used as an alternator after diode array
and regulated to 12-14 volts ??.............
Kelly Troyer
"DYKE DELTA JD2" (Eventually)
"13B ROTARY"_ Engine
"RWS"_RD1C/EC2/EM2
"MISTRAL"_Backplate/Oil
Manifold
"TURBONETICS"_TO4E50 Turbo
From: "Lehanover@aol.com" <Lehanover@aol.com>
To: Rotary motors in aircraft
<flyrotary@lancaironline.net>
Sent: Tue, October 5, 2010 4:50:00
PM
Subject: [FlyRotary] Re:
Permanent Magnet Alternators
In a message dated 10/5/2010 4:47:46 P.M. Eastern Daylight Time,
echristley@nc.rr.com writes:
Lynn, do
you have any documentation stating a max
RPM?
--
In the tech data the KV rating times the voltage applied gives you the prop
RPM per volt. Usually 11.7 or 22 volts from Lipo batteries.
Virtually unlimited RPM as an alternator, as no copper is moving at all. No
brushes to wear out or sparking.
For example a 670KV motor with 11.7 volts and a medium size prop about an
11" by 6" will turn up 7,839 RPM. You can hover a 5 pound 60" wingspan plane
with that. They don't even get hot. Mine was $28.50.
Lynn E. Hanover
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