Re: pump control
- From: clay@xxxxxxxxxxxxxxx
- Date: Thu, 29 May 2008 07:22:40 -0700 (PDT)
On May 29, 8:07 am, "sorenbirk" <sorenb...@xxxxxxxxx> wrote:
This is actualy a question regarding control theory...
I am controlling a motor by sending a reference between 0 and 1, where one
corresponds to full speed and 0 to stopped, i.e., the motor only turns in
one direction. It is an analog value, so any value between 0 and 1
corresponds to a motor speed. The motor drives a pump, which produces a
pressure. My application is to keep the pressure constant, by controlling
the motor speed. The pressure is measured in N/m^2, (e.g. 100000 N/m^2)
which gives rather large error signals. My problem is how to scale my
signals, as the control signal must be between 0 and 1? How is this
commonly done?
You can use a PID controller to operate the pump using pressure as it
input.
Although practically you may wish to have the pump fill a tank using a
simple on/off controller and then use a regulator on the tank's
output. This way the pump doesn't have to run all of the time. If you
are pumping liquid, just have a compressible air bladder in the tank.
IHTH,
Clay
.
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