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IVO Prop current limiter

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bob.verwey(at)gmail.com
Guest

Posted: Thu Nov 01, 2018 5:43 am Post subject: IVO Prop current limiter

Guys how difficult would it be to have an adjustment for the current trip setpoint? I'm thinking of this as a good option for a hydraulic pump application on an aircraft, it makes sense because of the versatility and lightness.

Best...Bob Verwey



082 331 2727

[img]https://docs.google.com/uc?export=download&id=0B5d7rgAInTuTUUZsUjY4QmJsdVU&revid=0B5d7rgAInTuTdDJDaXRFZVh3b3lMa3FWL0s3MFdzc01YRlNvPQ[/img]





On Mon, 29 May 2017 at 18:04, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:



 	  Quote: 	
		    At 11:06 PM 5/27/2017, you wrote:



  	  Quote: 	
		    	  Quote: 	
		    	  Quote: 	
		  with the engine off, the prop and circuit behaved normally.  With the engine running, the prop current is shut down almost immediately, though a small bit of pitch change does occur prior to cut-off.



 --------

 Doug 	
	


 Could this have something to do with the higher system voltage when the engine is running? 	


   possibly . . . but I think not. The

   current limiter is configured to 'latch'

   into an OFF state approx 200 mS after

   a current limit on the order of 9A is

   achieved.



   The 'latch' is subject to premature triggering

   if subjected to noise which I suspect is coming

   from the ship's alternator. 



 

 [img]cid:166cf7ef43a4ec4f5b01[/img]



 

   Doug,



   Try tacking this combination of components onto

   your assembly. The experiment is to see if adding

   a smoothing capacitor to the circuit's power

   source will sufficiently attenuate the antagonistic

   energies. The 100 uF cap is the 'smoother' while

   the 10 ohm resistor mitigates inrush currents impressed

   on the circuit when the directional control switch

   closes . . .



 



 



 

 

   Bob . . .

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nuckolls.bob(at)aeroelect
Guest

Posted: Thu Nov 01, 2018 6:34 am Post subject: IVO Prop current limiter

At 08:41 AM 11/1/2018, you wrote:

  	  Quote: 	
		  Guys how difficult would it be to have an adjustment for the current trip setpoint? I'm thinking of this as a good option for a hydraulic pump application on an aircraft, it makes sense because of the versatility and lightness. 	


   The IVO controller is nothing more than

   an electronic circuit breaker with tightly

   calibrated trip current and trip delay.



   This product was made practical by design

   choices of the IVO prop drive mechanism.

   It is difficult if not impossible to fit

   the pitch actuator with limit switches.

   The original designers elected to size

   motor torque, gearbox robustness and 

   mechanical limit stops such that no

   mechanical damage is incurred by allowing

   the mechanism to routinely visit hard

   stops at the end of travel.



   Many actuators I've worked with are not

   so robust . . . repeated encounters with

   hard stops severely limits service life

   or poses risk of damage.



   The IVO actuator's circuit breaker proved

   to be both electrical fault protection

   -AND- an indicator for having reached end

   of travel. Like crowbar ov protection, the

   prop pitch breaker simply pops when the

   system reaches mechanical limits.



   The IVO controller was simply an extension

   of this design philosophy to make the end-of-

   travel-trip both self resetting -AND-

   event annunciating. Hence it is more a 

   controller than circuit breaker.



   Unlike the IVO prop, the hydraulic pump does

   not routinely trip the feeder protection. 



 

 

   Bob . . .

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