On 12/03/2014 07:28 PM, Leonardo Marsaglia wrote: > 2014-12-04 0:11 GMT-03:00 Jon Elson <[email protected]>: > >> There are basically two ways to run resolvers. You can >> excite the rotor and get two >> varying voltages from the stator coils. These will >> generally be in phase with the >> excitation, or 180 degrees out of phase. >> >> Or, you can excite the two stator coils with signals that >> have some phase relationship, >> (usually 90 degrees) and measure the time of the zero >> crossing of the rotor signal, >> which will be roughly constant amplitude. >> >> it sounds like this system may be using the excite the >> stator scheme. >> > Hello Jon and thank you for the explaination! > > So in theory I could use them as normal resolvers and output them to > LinuxCNC as several people did. > > The problem is I don't know if it's worth to spend money on hardware just > to test if this is going to work, or if it's better to use encoders from > scratch which I know they will work. On my mazak ( V5) the resolvers were mounted in the servo motors with an approx 7:1 gearing. I'm guessing that that gearing plus the gears between the servo motor and the ballscrew gave them a clean 10x ratio. I put 2500 cpr encoders on the ballscrew ends and that seemed to work OK and gave me 40,000 c/in. Of course, I have no idea how much resolution was built into the resolver electronics. I built aluminium cases around the encoders and the only failure I've had was a broken coupler.
If you can use the resolvers it certainly makes for less effort to get a running system. Dave > > ------------------------------------------------------------------------------ Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration & more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
