I am just curious, in what application is it needed to know motor shaft position to fractions of a degree even with constant and variable loads when running at 20000 rpm?
> -----Original Message----- > From: Kirk Wallace [mailto:kwall...@wallacecompany.com] > Sent: den 23 januari 2011 10:01 > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] DIY BLDC Motors - FCM8201,2 and IRAMS > > 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 ------------------------------------------------------------------------------ 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
