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Landing gear electric actuator circuit

 
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nuckolls.bob(at)aeroelect
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PostPosted: Sat Mar 09, 2019 7:44 am    Post subject: Landing gear electric actuator circuit Reply with quote

At 06:55 PM 3/8/2019, you wrote:
Quote:
At 01:19 PM 3/8/2019, you wrote:
Quote:
--> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com>

How about this?
Is the purpose of shorting the motor to bring it to stop it quicker?

--------
Joe Gores

Attachments:

http://forums.matronics.com//files/long_ez_gear_d_919.jpg

Not bad! The only downside I see here
is that the crew control switch carries
motor current . . . which is not a
horrible thing to contemplate.

On further contemplation, your
suggested circuit seems quite
practical. Lower parts count and
yes, motor current runs through
the panel switch but I suspect that
most if not all of the switch bounce
will have died out before the relay
'makes' . . . wear-n-tear on switch
is minimized.



Bob . . .


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user9253



Joined: 28 Mar 2008
Posts: 1900
Location: Riley TWP Michigan

PostPosted: Sat Mar 09, 2019 11:08 am    Post subject: Re: Landing gear electric actuator circuit Reply with quote

Thanks Bob

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nuckolls.bob(at)aeroelect
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PostPosted: Mon Mar 11, 2019 8:03 am    Post subject: Landing gear electric actuator circuit Reply with quote

Quote:
Will be interested to see your next iteration . . .
in the mean time, I'll see if I can dig up
the notes on the selective dynamic braking
design.

Found the files. Here's an AeroElectric
Connection drawing that adapts the idea
from that program to a page-per-system
file . . .


http://www.aeroelectric.com/PPS/Landing_Gear/Canard%20Pusher%20Gear.pdf

The dynamic braking path is asserted only
while the gear select switch is in a
gear-up or gear-down position. When operating
the gear, the pilot would not release the
switch until the expected limit light
illuminates. During the reaction time from first
light to pilot release of the switch, the
gear system would be brought to a rapid
halt through the selective dynamic braking
relay.

Once the pilot is satisfied with gear
position, the switch is released which
also drops the dynamic braking relay.

Hence, during power failure or failure of
electrical controls, there will be no
impediment to using a manual, hand-crank
feature to lower the gear.


Bob . . .


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user9253



Joined: 28 Mar 2008
Posts: 1900
Location: Riley TWP Michigan

PostPosted: Mon Mar 11, 2019 10:33 am    Post subject: Re: Landing gear electric actuator circuit Reply with quote

Would this circuit work? The intent is to slow the motor quickly until the
induced voltage drops below zener voltage. The motor would then coast until
stopped. It should be easy to turn the motor slowly by hand. A resistor could
be connected in parallel with the two zener diodes.
I do not know if it will work, just asking.


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