We have a saying in my language that roughly translated says : "I have just picked a lashing stick for my own ass" :)
He said I should covert to steppers for the sake of cost and I said No lets try and make the servos work. I will have to look at Jon's stuff as well before I decide. Thanks for all the great info. I have a feeling though that I will ask some more questions on the BLDC component in the near future. ------ Original Message ------ From: "andy pugh" <bodge...@gmail.com> To: "Marius Liebenberg" <mar...@mastercut.co.za> Cc: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> Sent: 2015-01-30 14:54:06 Subject: Re: Re[2]: [Emc-users] BLDC Hal component >On 30 January 2015 at 12:33, Marius Liebenberg <mar...@mastercut.co.za> >wrote: >> >> 196V @ 8.5A and looks like a resolver feedback. These are the Lafert. >>The >> others I have not seen yet. > >That sounds a lot like what I have on my mill. > >Pico-systems have a 160V / 20A servo drive that can probably be made >to work along with their resolver-to-quadrature converter. I think you >would need advice from Jon as to how to commutate using the converter. >It may be that the bldc component can help there. > >On my machine I am using a set of the Mesa 8i20 drives and the 7i49 >resolver interface board. Because the 8i20 takes digital phase angle >information I am not using the 7i49 analogue outputs, and had to add a >7i44 for the serial comms. The FPGA board on my system is the 5i23 but >I think that 5i24 or 6i24 are cheaper and equivalent now. > >There are drives from the likes of AMC that take +/-10V command and >hall signal patterns. The bldc component can convert resolver feedback >from the 7i49 to hall patterns. This might also work with the Pico >drives, but I think that they are PWM controlled rather than analogue. > >You almost certainly can't connect resolvers to the parallel port even >through quadrature converters because the counts-per-rev is too high. >The Pico boards count in hardware (and connect to the parport) so do >work with their resolver to quadrature board. > >Whilst other options exist, the 5i23 / 7i49 / 7i44 / 8i20 combination >is known to work, though is not inexpensive. > >-- >atp >If you can't fix it, you don't own it. >http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ Dive into the World of Parallel Programming. The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
