Robert Pabon wrote: > Andy I wanted to get back to this because I am looking at another amp that > uses sinusoidal drive. It is a copley 7425 AC drive: > http://www.copleycontrols.com/motion/pdf/7225ac.pdf > What they are doing is using two analog +-10v to represent the current > command for the u and v and then they are synthesizing w either 120 or 90 > degrees apart. Actually, because there are only three wires on the servo motor, U + V + W must equal 0 (zero). So, W can be derived by simple subtraction. > This seems pretty doable assuming using something like the 5i20 than a 7i33 > card. > The obvious benefits are that I get the voltages I need, I get line power so > I just need a line filter which will definitely offset the cost of the extra > card. but it looks maybe a bit harder to set up. What do you think? > > The difficult part is that a hal component needs to know the approximate rotor position to provide U and V signals that will get the motor to move. Once it has passed the index marker, the exact position can be computed from the encoder count. I think somebody has got a new component that does most of this, but it is still pretty experimental.
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