On Saturday 04 August 2007, Jon Elson wrote: >Gene Heskett wrote: >> On Saturday 04 August 2007, Jon Elson wrote: >>>The rotary coils are your resolver. Your resolver should be >>>built at the factory so there is no need for diddling. > >I'm pretty sure the 2S1200 needs no coils > >> Maybe, maybe not. I have wound coils before, and it would be a learning >> experience. > >But, you are going to spend the rest of your life trying to make >a resolver that works as well as a commercial one. That doesn't >make sense. I have looked at both the chip and the eval board >data sheets, and the only inductors I see are some simple filter >inductors on the power supply nets.
>From the schematics, one must assume that the 3 sets of balanced signals are, exciter signal, to be off-chip buffered to sufficient power to excite the driving coil, and the other two pairs of differential inputs are just as easily seen as inputs from the detection coils, presumably oriented at 90 degrees magnetically from each other. >>>>Then the question is, can emc2 interface, via a separate parport, the >>>>rather copious amount of data this thing can produce on demand, and make >>>>use of it at usable spindle speeds? That would appear to be easier on >>>> the software than trying to use the quadrature signals since their rep >>>> rate can get well into the megahertz range, pushing the interrupts right >>>> over the edge. >>> >>>Yes, you skip the absolute output and just use the A and B >>>outputs that look just line an encoder. Don't try to interface >>>something like this in software. Use a hardware encoder >>>counter. You'd never use the quadrature signal to cause interrupts. >> >> Another accessory board? Whose would you suggest? And which .ini file? > >Umm, well, you could use my universal PWM Controller board. It >has quadrature counters and PWM generators for servo amps for up >to 4 axes, and digital inputs and outputs, too. See >http://jelinux.pico-systems.com/univpwm.html >for more info on it. There are other choices, too. For my toy, by the time I'd change all the motors and buy your amps, I can easily see the far side of a $500 bill before I make swarf again. I don't think I could justify that given the demonstrated sloppiness of this particular machine. However, I've been drooling over the Grizzly catalog, and their fancied up X3 sure looks good if I can drum up enough production business to make it pay its way somehow. For that, 4 of the 425 motors, and some gecko drives would seem to make the most sense. The 4th motor goes on the rotary table of course, so I could hob gears and such. >But, this replaces just about everything else you would need, >such as breakout boards, SSR mounting panels, cables, etc. > >A similar product is the Universal Stepper Controller, for any >servo or stepper drive that takes step and direction pulses. > >For old versions such as EMC1 and BDI, suitable .ini files are >on my web page. For all EMC2 versions, they are part of the >list of configs directories that come with the EMC2 >distribution. Specifically, univpwm for the PWM controller, and >univstep for the stepper controller. I have some other versions >that support the spindle DAC option, spindle-synced threading >and such. > >Jon Thanks Jon. All meat for consideration when I get caught up on the honeydoos. -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Always leave room to add an explanation if it doesn't work out. ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
