Hi Mark,
The most straightforward way to add redundancy and to solve the
overheating problem is to install a second motor on the same shaft and
run it with the second inverter. Close to the redundancy of a twin
engine aircraft. He could perhaps reduce the size of each the twin
motors slightly to better match the controller output.
Adds a bit of weight, but not a huge amount. Adds a significant
amount of power, however.
He can make the controller "fold back" to a lower output when it
starts to get too warm in firmware. Far far better than a shutdown, or a
controller failure.
On 4/30/2023 1:51 AM, Mark Hanson via EV wrote:
Hi Folks
I live near Bob Barrows bearhawkaircraft.com plane “experimental” kits to get
around FAA requirements. He and his associate are building a single seater
electric version of his bearhawk kit. They’re using an Australian APD control
with a 3K rpm direct drive BLDC (pulsed 3 phase) magnet motor ( so no brushes
to fail). They bought the package from a consultant in California and Mike was
programming the controller with his laptop when I visited. It runs fine at
200A 120Vdc on a Lithium China pack but at 300A starts to overheat. So they’re
adding a second controller for flight redundancy and dual 3 phase windings in
the motor in the next couple months.
Does anyone work on electric planes or is there an off the shelf electric drive
(motor control) with a good reliable track record ? Just don’t want to be
reinventing the wheel here…. If you google Bob Barrows electric plane YouTube
videos pop up about the construction and issues they’ve run into. He estimates
about 1/2 hour of flight time.
Stay Charged
Mark
Sent from my iPhone
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