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Transorbs for Lancair Flap Actuator...

 
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gregcampbellusa(at)gmail.
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PostPosted: Sat Aug 26, 2006 2:57 pm    Post subject: Transorbs for Lancair Flap Actuator... Reply with quote
What size Transorb or MOV would be suitable for the flap motor on a Lancair ES ?
They use an "FL1" 12v (or 24v) "linear actuator", Aircraft Spruce part # 05-66223
http://www.aircraftspruce.com/catalog/appages/flaplinact.php

Lancair provided the flap actuator, limit switches, and Omrom 12vdc relays.
I'm still using the "factory standard" schematic, but it doesn't utilize diodes
or MOV's to protect the switches or relays. The flap motor is a pretty healthy
size motor, I'm guessing the amp draw is around 8 or 10 amps.

The Lancair schematic shorts the two terminals of the flap motor together
when the flap is not in operation. This acts as an electronic brake
and noticeably minimizes any tendency to "coast".

If I wanted to add a transorb - would I just wire it in parallel with the motor leads?
What size would I use? (Mine is a 12v system, but others have the 24v model.)

Thanks,
Greg
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Eric M. Jones



Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts
PostPosted: Sun Aug 27, 2006 3:37 pm    Post subject: Re: Transorbs for Lancair Flap Actuator... Reply with quote
Quote:
What size Transorb or MOV would be suitable for the flap motor on a Lancair ES ? They use an "FL1" 12v (or 24v) "linear actuator", Aircraft Spruce part # 05-66223 .....

Lancair provided the flap actuator, limit switches, and Omrom 12vdc relays. I'm still using the "factory standard" schematic, but it doesn't utilize diodes or MOV's to protect the switches or relays. The flap motor is a pretty healthy size motor, I'm guessing the amp draw is around 8 or 10 amps.

The Lancair schematic shorts the two terminals of the flap motor together
when the flap is not in operation. This acts as an electronic brake
and noticeably minimizes any tendency to "coast".

If I wanted to add a transorb - would I just wire it in parallel with the motor leads? What size would I use? (Mine is a 12v system, but others have the 24v model.) Thanks, Greg


Greg,

Transient supressors are installed so as to shunt the inductive coil in a relay or motor, and also to shunt to ground the positive leads on bidirectional motors. The SnapJack suppressors on my website are fine and I show the places to mount them. For 24-28V systems us 600W 36V bidirectional transorbs.

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Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net
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bonanza(at)vodamail.co.za
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PostPosted: Mon Aug 28, 2006 4:58 am    Post subject: Transorbs for Lancair Flap Actuator... Reply with quote
Greg,
Could you post that part of the circuit (or sketch) showing the “brake” system relays where it “shorts” the motor leads. Working on something similar for a homebuilt project with 28v. Also where you would put the transorbs.

Thanx
Bob Verwey
A35 Bonanza ZU-DLW
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robert.bishop(at)peterson
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PostPosted: Mon Aug 28, 2006 5:37 am    Post subject: Transorbs for Lancair Flap Actuator... Reply with quote
TWIMC,
How on earth can I get off this "Chat Board" distribution list? I get
about 300 unwanted e-mails a day... Any help would be appreciated.
Thanks

MSgt Robert Bishop
21 MOF/CCA
W: 556-6527 (DSN 834)


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