On Sun, 2011-01-23 at 17:04 +1030, Eric Parsonage wrote: > Hi guys > > I think you would do better to leverage of the work done by others on > bldc drivers. The open-bldc project is very advanced in getting nice > control of the motors using an stm32. h > > Piotr has already prototype hardware available for a control section > (his intent is to create seperate output sections for different > motors). He has done all the hard yards of creating toolchains and > JTAG programmers built documented etc. He has boards made. Whilst his > interest is not cnc he is a big open source fan. > > Regards Eric
Just very briefly looking at the open-bldc site, it looks like they are doing more of a speed control or ESC. What I have planned is a little different in two (or more) ways. First, a CNC axis application needs to control motor shaft position to fractions of a degree even with constant and variable loads, or rather, integrate well with the motion control software and have very low latency. Second, I want to keep most of the intelligence in EMC2 as opposed to the more popular step/dir DC motor controllers that have some motion control built in. The plan is to have EMC2 send velocity data, receive encoder counts, and do commutation, but commutation and bridge switch timing might be better done in the signal generator microprocessor to keep that loop close to the motor. I haven't gotten that far yet. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! Finally, a world-class log management solution at an even better price-free! Download using promo code Free_Logger_4_Dev2Dev. Offer expires February 28th, so secure your free ArcSight Logger TODAY! http://p.sf.net/sfu/arcsight-sfd2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
