On Sunday 18 December 2016 17:46:21 andy pugh wrote: > On 17 December 2016 at 21:56, Jon Elson <[email protected]> wrote: > > Well, I think the A06B-6058 is a PWM-input servo amp that > > requires SIX PWM signals, one to drive each transistor. > > That's six signals PER AXIS. > > As Jon mentioned, Mesa does have a three-phase PWM module that (in > some configurations) has all 6 channels connected to output pins. > > The software "bldc" component can provide 6 separate PWM amplitudes, > but that isn't something that you can connect to 6 separate PWM > modules, as the PWM signals need to be running in phase with each > other, or there is a danger of turning on both the high and low side > drivers of the same part of the bridge: > https://en.wikipedia.org/wiki/Power_inverter#Three-phase_inverters > shows why some drives need 6 PWM channels, and also shows why having > high-side and low-side turned on at the same time is a problem.
Andy, always curious, I see I have a bldc_hall3 module and manpage, at the bottom of which it says to see bldc_hall6 for 6 wire unipolar motors. But I have neither the module, nor that manpage. ISTR we had something like that in older releases? But the *_hall3 manpage says it was created 2 weeks ago. Is my wet ram lieing to me? Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
