What is the proper method for tuning a hydraulic servo?
There has always been lots of talk about tuning electric motors, but whenever hydraulics are brought everyone starts to get very vague.
I want to know if Galil has a 'manufacturers suggested method' for tuning a hydraulic servo.
Galil_Todds on 04/20/2001 - 08:23
Assuming the hydraulic servo is very responsive, tuning should be very similar to a standard DC or AC servo motor. The only difference is the initial stiction that some hydraulic systems have that needs to be accounted for. I would recommend using the FA command (Feedforward Acceleration), which adds a bias voltage to the accel and decel in order to overcome this static friction. One characteristic of many hydraulic systems that aids in tuning is the inherent damping of the hydraulics. This makes for a much easier system to stabilize, so that the KD term does not need to provide all of the velocity damping.
Frank van den Berg on 04/26/2001 - 11:09
Hello,
What kind of hardware is ussually used for controlling hydraulic systems ?
Does it take special (fast) valves ? Brand ?
Can flexible oiltubes be used, or only metal pipes ?
Can hydraulic positioning be as accurate as servo-motor positioning ??
Many thanks,
Kind regards,
Frank
NTGuy on 05/08/2001 - 14:33
It all depends on your application ofcourse but if you need accuracy Use Servo Valves and not Proportional vavles.
Also make sure your vavles got encoders for feedback.
DIECOMAN on 05/09/2001 - 06:46
Servo Valves are too expensive, and are very susceptable to containmenation.
Especially when our customers do not follow recommended filter change schedules.