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Landing gear electric actuator circuit

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nuckolls.bob(at)aeroelect
Guest

Posted: Sat Mar 09, 2019 7:44 am Post subject: Landing gear electric actuator circuit

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: 1921
Location: Riley TWP Michigan

Posted: Sat Mar 09, 2019 11:08 am Post subject: Re: Landing gear electric actuator circuit

Thanks Bob

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_________________
Joe Gores

nuckolls.bob(at)aeroelect
Guest

Posted: Mon Mar 11, 2019 8:03 am Post subject: Landing gear electric actuator circuit

 	  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: 1921
Location: Riley TWP Michigan

Posted: Mon Mar 11, 2019 10:33 am Post subject: Re: Landing gear electric actuator circuit

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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