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IVO Prop current limiter

 
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bob.verwey(at)gmail.com
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PostPosted: Thu Nov 01, 2018 5:43 am    Post subject: IVO Prop current limiter Reply with 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.
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
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PostPosted: Thu Nov 01, 2018 6:34 am    Post subject: IVO Prop current limiter Reply with quote

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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