The biggest problem with stepper motors is they are designed to have a given DC resistance so that some DC voltage can be applied without the current going it infinity when the motor is stopped. That resistance is why they get hot.
Unlike that stepper motor every good high performance AC or DC motor is designed so as to get that DC resistance as close to zero as possible. So say you are trying to drag a weight around on the floor while at all times controlling its position and velocity. A stepper motor is like pulling on that weight with bungee cords, it will always be in the wrong place and/or moving in the wrong direction. The servo is more like a steel bar. While steppers have their place, but if you want precision motion control of a machine with unknown and variable factors (part mass and cutting forces) they are not the best choice. And from what I have seen by the time you add all the extra stuff to make up for their defects you would have been much farther ahead to have just went with servos in the first place. ______________ Andre' B. ------------------------------------------------------------------------------ Check out the new SourceForge.net Marketplace. It is the best place to buy or sell services for just about anything Open Source. http://p.sf.net/sfu/Xq1LFB _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
