On Wed, 13 Dec 2006, Anders Wallin wrote: > Date: Wed, 13 Dec 2006 20:18:16 +0200 > From: Anders Wallin <[EMAIL PROTECTED]> > Reply-To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Subject: [Emc-users] Mesa m5i20 PWM frequency ? > > Hi All, > > I'm considering using Jon Elson's PWM servo amplifiers with my Mesa > M5i20 servo card. > > Jon tells me his amplifiers are optimized for 50 kHz PWM frequency. Does > anyone know in what range the PWM frequency is adjustable on the Mesa > M5i20 ? >
Its limited to ~33 KHz at the moment (33.3 MHz PCI clock /1024) It would be pretty easy to use the 50 MHz clock instead to the max would be close to 50 KHz, or double that for 100 KHz or so maximum. 50 KHz is pretty high for PWM, as the switching losses in the HBridge go up, and the dead time becomes more of the total cycle time. If the PWM is not used directly to drive a HBridge, (just filtered to generate an analog current threshold or something) then using the interleaved PWM option will result lower ripple, so such a high PWM rate is not needed, but dont use the interleaved option if the PWM drives an HBridge directly... > The manual talks about 10-bit PWM with a 33MHz clock so 1024 ticks > equals 31us or 32.2 kHz > is it possible to use a higher PWM frequency than this ? > > AW > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share your > opinions on IT & business topics through brief surveys - and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
