Andy thanks for your explaination about the 8i20 card. So, this card used with LinuxCNC and hostmot2 will work well to drive a servo for accurate positioning. Right?
I saw that you wrote the difference between an AC brushless and DC brushed motor if I'm not wrong. But the main doubt that I have is the difference between AC brushless and DC brushless motors. Sorry If I read your message wrongly. El 22 de enero de 2012 20:27, andy pugh <bodge...@gmail.com> escribió: > 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 > -- *Leonardo Marsaglia*. ------------------------------------------------------------------------------ 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
