Jon Elson wrote: > Ed Fanta sent me a HUGE Fanuc "red cap" brushless servo motor to work > with.
These are an "average" size for most machine tools. These motors use an insane > proprietary commutation encoder scheme that puts each cycle of the motor > into 16 states, represented by 4 signal > lines. Obviously, for a 6-step drive, which I'm pretty sure they must > have been using at that time, just using 3 lines > would have been a LOT more straightforward, but not proprietary. > > Anyway, I have just gotten a converter board partially working for this > motor/encoder. The idea is to use the > 4 proprietary signals to get the motor moving, and switch to counting > encoder pulses once the encoder index pulse > (Z) has appeared. I don't have the inital use of the absolute signals > aligned right, but once the index is seen, it works very well. > Making the absolute signals work is just realigning the code values. > But, the good news is this motor runs VERY nicely > with my 6-step PWM drive, very smooth and with practically no vibration. > > So, for anyone considering a retrofit of a machine with brushless Fanuc > motors, I should have a solution available > very shortly. I will be bringing this to the EMC Fest for demos. > > Jon A lot of machines that use this size motor will be getting to "end of life" in the next few years. The iron can be rebuilt, usually with simply replacing the linear ways, the controls will be obsoleted leaving a lot of opportunities for the smaller operator. Ed. ------------------------------------------------------------------------------ Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
