> The Pico system you make looks very nice and is something I will > consider. I don't really have a full understanding of how the brushless > servos work, but I'm slowly learning. So far I think I understand that > they are like stepper motors just with 3 steps instead of 200, which > allows them to spin at high rpms since there is more time for the > magnetic field to build in the coils since the coils only have to be > switched on and off 3 times per rev. But if this is correct, wouldn't > stopping and holding the position of the motor somewhere between the > poles be like how microstepping works on stepper motors and it wouldn't > be that accurate? > >
No, Brushless Servos are not like Steppers at all. You can position a brushless servo to a fraction of a degree of rotation typically. The resolution really depends on encoder count and the quality of the drive and motor. But on a typical industrial brushless servo motor/drive system you can typically position the motor shaft in increments that you cannot see! Steppers "step", brushless servos rotate very smoothly if the system is tuned properly. The difference is very dramatic. Still many machines run very well with steppers. It all depends on what you need and how deep your pockets are. There was a company in BC Canada selling small brushless servo motor systems very cheaply. Have you found them yet? I can find the link if you haven't. They were selling on Ebay for quite a while. Dave ------------------------------------------------------------------------------ This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers http://p.sf.net/sfu/verizon-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
