Hmmm! Resolver for position or AC servo control or both? Dave
On Wed, 2009-11-18 at 11:39 -0800, Peter C. Wallace wrote: > On Wed, 18 Nov 2009, Anders Wallin wrote: > > > Date: Wed, 18 Nov 2009 19:48:17 +0200 > > From: Anders Wallin <anders.e.e.wal...@gmail.com> > > Reply-To: "Enhanced Machine Controller (EMC)" > > <emc-users@lists.sourceforge.net> > > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > > Subject: [Emc-users] Mesa 5i20 vs 22 vs 23 ? > > > > Hi all, > > > > I have a mill which runs a mesa 5i20 card and I am now starting a > > lathe build/retrofit (more on that later!). Compared to a few years > > ago there are now three or four variants of these cards available: > > 5i20, 5i22-1, 5i22-1.5 and 5i23. > > Also, I know there has been some good work on the modular hm2 > > fpga-code and emc2-driver for these cards. > > > > - How stable is the hm2 fpga-code + driver right now? anyone using it > > routinely for 'production' ? > > There seem to be at least several people using it in production. There are > undoubtedly some remaining firmware and driver bugs, but the basics look to > be > pretty solid. (Thanks Sebastian!) > > > - Any benefits of the 5i23 (400kgate fpga) over the 5i20 (200k fpga) ? > > - The 5i22 cards are more expensive, have a bit more I/O, but isn't > > the large fpga overkill for a setup where emc2 runs the pid-loops on > > the cpu anyway? > > The main advantage of the 5I22 and 5I23 is future growth potential. Here are > some advantages of the 5I22 and 5I23: > > 1. The PCI bridge chips used on the 5I23 and 5I22 support DMA. The HostMot2 > driver was designed at the outset to eventually support DMA to lower the > overhead of card access. > > 2. The larger FPGAs will support fancier configurations, for example > the resolver configuration I'm working on will not fit in the 5I20s Spartan2 > chip (Mainly because theres no hardware multiplier in Spartan2) > > 3. Higher speed, the Spartan3 chips used on the 5I22 and 5I23 are about 50% > faster than Spartan2 used on the 5I20. This is especially noticeble when > processors are embedded in the FPGA. > > On the other hand, the 5I20 is probably overkill for controlling a lathe, if > 72 pins are sufficient. (GPIO will eventually be expandable via SPI anyway) > the HostMot2 firmware supports up to 12 axis of servo interface on the 5I20, > so a 3/4 axis lathe is not taxing its capabilities. > > > > > > > For the lathe I will have servos on the Z- and X-axes, not sure about > > DC-brush vs. brushless yet, but Jon Elsons PWM amps work very well on > > the mill so I am leaning towards them. Then the spindle will hopefully > > be driven by a big 1.75kW brushless servo. The lathe project also > > calls for a revolver-type toolchanger which needs one I/O bit for a > > pneumatic cylinder, and one servo/stepper axis to rotate the revolver. > > In addition I will need the usual jog-pendant I/O: MPG (thinking about > > two, separate for X and Z), a few selection-switches, and some > > buttons. Live tooling is a dream for the future :) > > Looking at the schematic for the mill[1], I think the lathe setup will > > be pretty similar and I should be OK with 72 I/O pins. > > > > regards, > > > > Anders W > > > > [1] > > http://www.anderswallin.net/wp-content/uploads/2008/09/dc_servo_schematic_2008jan19.pdf > > > > ------------------------------------------------------------------------------ > > Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day > > trial. Simplify your report design, integration and deployment - and focus > > on > > what you do best, core application coding. Discover what's new with > > Crystal Reports now. http://p.sf.net/sfu/bobj-july > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > Peter Wallace > Mesa Electronics > > (\__/) > (='.'=) This is Bunny. Copy and paste bunny into your > (")_(") signature to help him gain world domination. > > > ------------------------------------------------------------------------------ > Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day > trial. Simplify your report design, integration and deployment - and focus on > what you do best, core application coding. Discover what's new with > Crystal Reports now. http://p.sf.net/sfu/bobj-july > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
