On 2 April 2013 09:19, propcoder <[email protected]> wrote: > The question is: which way to go?
I guess there are two ways to do this, either choose the optimum for each application, or try to find one technology which fits all applications. The latter approach is likely to be a lot more expensive, but does have the advantage that upgrades will simply involve bigger motors and/or bigger drives and no changes to the control system. > 1. Take AC servo motors and drives like Yaskawa, Panasonic, Delta > electronics, add gearboxes, tune PID, use position control mode using > LPT and step/dir. > 2. The same as 1, but with mesa card and velocity control mode, position > loop in LinuxCNC. I think this way is logical only where trajectory > following needed. I don't think I would consider using the parport in an industrial setting. However I might be tempted to use step-dir servo drives with internal position control for the more undemanding applications. If all that is needed is for something to go to a position, then a Limit3 and stepgen is easily controlled direct from HAL. > As for the 5th, I think it is possible to use a bridge, make PWM > frequency booster or serial-in to PWM-out controller with current > limiter and encoder counter with serial shift-out interface. It is possible to control a 3-phase inverter bridge directly from a Mesa card, the three-phase PWM generator and the HAL bldc component do all that is required. However, I doubt it makes sense to install home-brew drives in an industrial setting, especially if the plan is to install, get paid, and walk away. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ Own the Future-Intel(R) Level Up Game Demo Contest 2013 Rise to greatness in Intel's independent game demo contest. Compete for recognition, cash, and the chance to get your game on Steam. $5K grand prize plus 10 genre and skill prizes. Submit your demo by 6/6/13. http://altfarm.mediaplex.com/ad/ck/12124-176961-30367-2 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
