I will never pass up an opportunity to show what we do.
Thanks Peter. But is the hydraulic card used to control the proportional valve or the swash plate on the pump?
Normally the hydraulic card controls a servo valve because a servo valve responds MUCH faster than a hydraulic motors swash plate. A lot depends on the needs of the application. All the examples below use a servo valve to control the hydraulic actuator.
There have been some instances where our controlller controls a VFD/motor with a fixed displacement pump. In this case we were controlling the speed of the motor to control position and pressure and he hydraulic oil was just a means of getting the energy from one point to another.
Could you you post some videos and links if you have them
This video was made by one of our distributors to prove to a major aircraft manufacturer that hydraulic axes can be synchronized. This is simple.
http://deltamotion.com/peter/Videos/EM 0405-06 PrePaint.wmv
The next video is really a force control application. It is simulating forces on a tire but what is unique is that it controls the vertical and horizontal force on the tire.
http://deltamotion.com/peter/Videos/Innkeeper LLC2.flv
This is an example of controlling a 6DOF ( Stewart ) platform.
This Stewart platform is in Vancouver BC and used to film movies. Whole movie sets are placed on the platform. This platform was used in making the movie 2012.
http://deltamotion.com/peter/Videos/40x40test.flv
Curve or shaping sawing is one of our most common applications. The wood is scanned and an 'optimizer' computes the best way to cut the wood to get the most recovery. The wood is dried out later to straight out the curves. In this video a different curve or spline is downloaded for every piece of wood. One spline is downloaded while the previous spline is being executed.
http://deltamotion.com/peter/Videos/JAN-04 VSS_0001.wmv
Another wood application. This is how veneer is peeled. There are over 30 axes if hydraulic and motor control on this machine. The lathe spindles are motor controlled, the rest are hydraulic. What makes these machine a challenge is that there is little linear motion. Cubic splines are used to linearize the actuators. The blocks of wood are scanned and then the spindles are moved to present the largest right cylinders to the lathe.
http://deltamotion.com/peter/Videos/charger 4.mp4
This is a video I made in response to another forum member that was having problems getting his hydraulic system to do what he wanted. He was trying to make sine waves using an S7 PLC. It worked but only up to two Hz. Our controller scans much faster and actually has a sinewave motion generator build in since we do so many testing applications that require sinusoidal motion.
http://deltamotion.com/peter/Videos/SineWave.mp4
Another video I have made.
http://deltamotion.com/peter/Videos/PositionControl/PositionControl.mp4
More application examples can be found here.
http://deltamotion.com/applications/
More magazine articles
http://deltamotion.com/applications/magazine.php