John, The work has already been done with the STMBL project. The biggest issue with that one was the 3 phase motor driver was discontinued so that caused a bit of panic. But it's an open source project that can use step/dir or smart serial from the MESA boards.
https://github.com/rene-dev/stmbl John Dammeyer > -----Original Message----- > From: John Figie [mailto:zephyr9...@gmail.com] > Sent: September-13-21 1:32 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Suggestions for a retrofit. > > It's been a long time and I have not made much progress. Except now I am > retired from my job as an electrical engineer. In my job I developed > industrial PMAC servo drives for a leading industrial controls manufacturer > located in Milwaukee. So to solve my servo amplifier problem I have decided > to build my own and have already made significant progress. My homemade > drives will be able to run either DC brush motors or in the future AC > motors. I have a basic torque mode drive in the process of development but > I am thinking I would like the drive to be a velocity mode drive. > > My question now is how to interface to LinuxCNC? I really want to connect > all of my I/O using the mesa ethernet cards like the 7I80. From the 7I80 it > looks like there is a way to have SPI interfaces. It seems like the SPI > would be one way to make a simple digital interface to my drives. The 7I80 > would send velocity commands and velocity feedback to the drives. The > drives would return status and fault information back to LinuxCNC. > > Is it possible for me to use the SPI interfaces with LinuxCNC in the way I > have described? If so, how does one go about setting up the SPI interfaces > and defining what data is passed back and forth? I am hoping Andy Pugh, PCW > or someone that knows can comment. > > LinuxCNC <--Ethernet--> 7I80 -----<> I/O inputs and outputs > |-----<> SPI comms to > servo amps 7I46? > | ----< encoder inputs for > axis and MPGs > > LinuxCNC with position loop only should be able to run with a slower 1mSec > or maybe 500uSec thread and no other high speed thread would be needed. I > may however need to get the velocity feedback to my servo drive at a faster > rate for best/better performance. > > My reason for wanting Ethernet is I do not have to have my LinuxCNC PC on > or embedded in my machine, it can be several meters away mounted where it > won't be subject to heat and vibration. In addition with only one > interface, a PC upgrade or repair / swap is easy. > > > Regards, > > John Figie > > > On Sun, Nov 29, 2020 at 6:47 PM dave engvall <dengv...@charter.net> wrote: > > > > > > > On 11/27/20 10:52 AM, andy pugh wrote: > > > On Fri, 27 Nov 2020 at 18:45, John Figie <zephyr9...@gmail.com> wrote: > > > > > >> I think I am going to attempt to figure out what the parameters of my > > motor > > >> are and make a model to simulate my control loop. For hobby stuff I > > think > > >> LTspice may be good to model and simulate. > > > I am not sure what you hope to gain from a model. The data to populate > > > it would have to come from the actual machine, and at that point you > > > might as well just get on with it. > > > > > IIRC early versions of emc had motor parameters, etc tacked on the the > > end of the parameters for each axis. I don't know if any use was ever > > made of that. > > Maybe some of the early emc-ers with their memory still intact will > > remember as well as a model to insert the data into. > > Dave > > > > Just a comment: I've never had much success using torque mode: that > > doesn't mean I should not go back and revisit it. > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
