Thanks andy< I sent out my motor feedback specs with another email and will try to keep the information brief so I don't become redundant. I was looking at the Mesa amps and it looks like only the 7I39 is a BLDC amp, the 8I20 appears to be AC (although granites VSD will run AC and BLDC, so maybe it can, I don't know). I am trying to keep this as dumb and generic as possible for a couple of reasons (parts sourcing and finding help) so I am trying to stick with what has been more or less proven. Rob
--- On Fri, 4/22/11, andy pugh <[email protected]> wrote: > From: andy pugh <[email protected]> > Subject: Re: [Emc-users] Motion control cards > To: "Enhanced Machine Controller (EMC)" <[email protected]> > Date: Friday, April 22, 2011, 6:08 AM > On 22 April 2011 05:11, Robert Pabon > @ Corse USA > <[email protected]> > wrote: > > > But I don't know much about motion control cards. How > generic are these things in terms of pairing them to servo > amps? > > If the servo amps take a +/- 10V signal then there are a > number of > ways to control them with EMC2. > Be aware that not all amps work with all motors, though. > There are a > number of possible feedback systems, some rather > proprietary. Even a > simple three hall sensors system can be set up in a variety > of ways. > (There are 48 possible combinations, but only a few are > actually used > in practice). > > > about software, if I buy something like a galil card > on ebay will I need driver software and is that available > somewhere? > > Much better to buy something from the "supported hardware" > list. > http://wiki.linuxcnc.org/emcinfo.pl?EMC2_Supported_Hardware > > The "EMC2 Way" is to use dumb hardware and do the > calculations and > feedback in the PC. You could use step-direction servo > drives as > suggested earlier, but that rather goes against this, as > you need to > do the tuning in the drive (and often with a Windows-only > special > utility). > Both the Pico and Mesa systems fit this paradigm, but so > does any > driver controlled in torque-mode by an analogue or PWM > signal output > by EMC2. If the motors have tachos and the drives are > velocity mode, > though, it is probably best to use them that way. > > > I have thought about the Mesa cards, but I honestly > don't know what all I would need to buy or what I would > > need to configure one. > > It depends on your motors' voltage and current > requirements. Mesa do > at least two drives for Brushless motors, the 7i39 and 8i20 > (just > Google them) > > There is an EMC2 software component that can take almost > any form of > motor feedback and convert it to almost any form of > amplifier drive. > > It is a complicated subject. I started to write a Wiki page > to try to > clarify it all, but got distracted. > http://wiki.linuxcnc.org/emcinfo.pl?BLDC > > -- > atp > "Torque wrenches are for the obedience of fools and the > guidance of wise men" > > ------------------------------------------------------------------------------ > Fulfilling the Lean Software Promise > Lean software platforms are now widely adopted and the > benefits have been > demonstrated beyond question. Learn why your peers are > replacing JEE > containers with lightweight application servers - and what > you can gain > from the move. http://p.sf.net/sfu/vmware-sfemails > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Fulfilling the Lean Software Promise Lean software platforms are now widely adopted and the benefits have been demonstrated beyond question. Learn why your peers are replacing JEE containers with lightweight application servers - and what you can gain from the move. http://p.sf.net/sfu/vmware-sfemails _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
