On Mon, 26 Apr 2010 11:22 +0100, "Andy Pugh" <a...@andypugh.fsnet.co.uk> wrote:
(snip) > I suspect that there might be scope for a specific HAL software PWM > module that provides the 6 gate drive signals to drive a 3-phase motor > of whatever type. The power modules I have been looking at recently > seem to work best at about 10kHz PWM frequency, well within the > capability of EMCs existing software PWM generation. 10kHz is not really within the capability of software PWM. 10kHz PWM means a total period of 100uS. If your base period is 20uS, then you only have 6 possible duty cycles: 0uS on time = 0% duty cycle 20uS on time 40uS on time 60uS on time 80uS on time 100uS on time = 100% duty cycle I suppose such a system might work, for some value of "work", but there will be significant voltage and current waveform distortion, etc, and probably a lot of torque ripple and other undesirable stuff. Regards, John Kasunich -- John Kasunich jmkasun...@fastmail.fm ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
