On Wed, 2012-05-02 at 10:19 -0500, Jon Elson wrote: ... snip > It just seems to me that when the motor inductance causes the winding > current to lag > behind the current command from the microstep sine wave, the current control > logic will automatically become the same as a full-step drive, with no > special > function at all required. But, I admit, I have not extracted the > schematic of > the drive to figure out if there is anything extra there. > > Jon
I suspect the magic is in the Xilinx chip programming, so we'll probably never know what the magic is. I'd like to play with a couple of Pico PWM amps on one of my Shizuoka steppers and drive them with FPGA PWM. There would not be any current feedback to work with unless I add a pair of ADC's though. On the other hand it might be more productive to start work on fitting some brushless motors. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
