On Thu, 7 Jan 2010, Flying Electron wrote: > Date: Thu, 07 Jan 2010 11:29:10 -0800 > From: Flying Electron <sa...@flyingelectron.com> > Reply-To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Subject: [Emc-users] Servo Drives > > I'm deciding on what servo drive to use with the mesa FPGA card and it > doesn't look too bad since there are not too many low cost options. I'm > constrained to a NEMA 23 size motor since a NEMA 23 stepper is on the > machine right now and I want it to be a direct swap. So far I've found > from searching on google and from people's suggestions here on the > mailing list: > > Drives > ------- > [brushless] Pico Brushless PWM Servo Amp $150 > [brushed] Pico PWM Servo Amplifier $125 > > Motors > -------- > [brushless] Pico Size 23 Brushless Servo (61ozin continous, 180ozin > peak, 1000 CPR) $120 > [brushless] Keling KL23BLS-115 Brushless Servo (61ozin continous, 180 > ozin peak, 1000 CPR) $134 > [brushed] Keling KL23-130-60 Brushed Servo (50ozin continous, 350ozin > peak, 1000 CPR) $162 > > Not Suitable > ------------- > dmm-tech.com -- RS232 based communication not PWM > gecko -- EMC2 cannot control PID loop (step/dir input, not > pwm) > viper -- EMC2 cannot control PID loop (step/dir input, > not pwm) > rutex -- EMC2 cannot control PID loop (step/dir input, > not pwm)
Well, the step+dir drives will work but you wont have a full closed loop system. > > Most of the servo drives I have found have the PID loop built into > them. Is this the normal case? For velocity mode drives, yes, the drive has a velocity control loop using tachometer or encoder feedback. EMC closes the position loop with this type of drive. > > Is it possible to run a brushed DC servo with just a simple H-Bridge > controlled directly by the PWM output and a direction signal? I was > looking at the Freescale MC33886 which I think could make a very simple > and cheap H-Bridge. > http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=MC33886VW-ND > <http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=MC33886VW-ND> Yes, though tuning will be fussier than with a velocity mode servo drive > > Anybody know of any companies or products I may have missed in my search? > > Yes, Mesa We have some simple Hbridges that match the pinout of our FPGA cards > > > ------------------------------------------------------------------------------ > This SF.Net email is sponsored by the Verizon Developer Community > Take advantage of Verizon's best-in-class app development support > A streamlined, 14 day to market process makes app distribution fast and easy > Join now and get one step closer to millions of Verizon customers > http://p.sf.net/sfu/verizon-dev2dev > _______________________________________________ > 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. ------------------------------------------------------------------------------ This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers http://p.sf.net/sfu/verizon-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
