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Knackmanic OP t1_iyop0wl wrote

Reply to comment by crazybutthole in Is it possible to control pump pressure with current? by Knackmanic

The machine I have is quite customizable and cheap. Users are installing pressure sensor. I was wondering if I could skip the pressure sensor which is used as a feedback to modulate the pump current, just by knowing what the pump's RMP/current is.

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frzn_dad t1_iyp6wm5 wrote

Depends on how static the other variables are. Hint they probably aren't or others wouldn't be using pressure control.

Also please explain how you intend modulate the current? Most speed controllers adjust voltage, frequency or resistance which do change the current but it isnt a direct correlation the load on the motor at a given speed changes the current.

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Fuzzy_Chom t1_iyrpngd wrote

That is what i was thinking. It's possible to estimate flow and pressure based on pump demand (current, etc), but you'd probably want to do so real testing and trending to understand the actual correlation. This is really the only shortcut around modeling every electrical and mechanical stage of the process, accounting for losses, variability, etc. Either way, it becomes a bit of a science project.

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