On 22 January 2012 23:20, Leonardo Marsaglia <leonardomarsagli...@gmail.com> wrote:
> I'm curious about the 8i20 card. Does this card handle the PID > calculations? That card does hardly any calculations at all. It takes current and phase angle information from EMC2/linuxCNC via a serial link. The current command will come from a PID component running in LinuxCNC, and the angle information comes from another HAL component which takes data from hall sensors, encoders or resolvers on the motor. > By the way, this card is intended for AC brushless motors. I'm not an > expert on the subject, so I need to ask. What's the main difference > between an AC brusless and a DC brushless motor. Do the coils change? The > control method?. Both. The main difference (apart from the lack of brushes) is that an AC brushless is a 3-phase machine so needs 3 power wires, and a brished servo is DC with only 2 power wires. You need very different drives. -- atp The idea that there is no such thing as objective truth is, quite simply, wrong. ------------------------------------------------------------------------------ Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
