how to simulate a proportional valve?
how to simulate a proportional valve?
(OP)
does anyone know how to simulate a proportional valve feedback, i wish the information for i can probe a board that drive ones of this valves.
thanks for your help
thanks for your help





RE: how to simulate a proportional valve?
RE: how to simulate a proportional valve?
thanks again
RE: how to simulate a proportional valve?
This simulation is non-trivial.
I am of course assuming that you are talking about proportional control of an on/off type of valve, where the duty cycle controls the proportional output. If you have a linear actuated valve then the simulation would simply consist of a few opamps, R's, C's and L's, to simulate the various system components.
RE: how to simulate a proportional valve?
RE: how to simulate a proportional valve?
http://www.boschrexroth.com/
I checked out the proportional hydraulic valves on the above site. The fluid flow is apparently monotonically dependant on the analog current into the solenoid coil. One beast in particular takes 30W (12V, 2.5A, 5 ohm coil). Testing the driver board would then consist of putting on a suitable load resistor and perhaps a moving coil meter to measure the output voltage. Obviously the board would have to be put into some sort of open-loop test condition.
RE: how to simulate a proportional valve?
i dont know much about proportional hidraulics but i saw the drawings for the feedback wiring on a ENGEL manual for a mold injection machine and it seems to be a LVDT or a resolver, more than a variable resistor. i assume by this fact that the valvule hasnt a linear output.
thanks again
RE: how to simulate a proportional valve?
On the other end ia a little more difficult. The LVDT may output a signal that will vary the phase of the signal. I you had a spare transducer, you could attach it to the motor via a cam or lever. You would have to allow for continuous rotation. An electronic simularor would likely be beyond explanation here.
RE: how to simulate a proportional valve?
and for the rexroth page
RE: how to simulate a proportional valve?
You might also check out Moog's page. They're well-known in the precision servo valve business.
http://www.moog.com/
----------------------------------
I don't suffer from insanity. I enjoy it...