kestreltom <kestrel...@...> writes: > > What about trying one of those radio control outrunner brushless dc motors > and > electronic speed controllers (ESC)? They are common on eBay and the RCgroups.com > classifieds here in the states. That would keep you in your power supply range, > but allow you to run up to 1500 watts and 20,000 rpm or more, provided your > spindle bearings can handle it. The control signal is a 0 - 5v pwm with a period > of 60 Hz and a pulse width of 1.0 to 2.0 mS which corresponds to 0-100% > power. I > think that the ESCs for r/c cars will reverse the motor using the smaller > portion of the pwm range. I would think it would be possible to output that > on a > Pport pin using pwmgen. A second pin could be your on/off signal. > > A guy, Matt Shumaker has an interesting web site documenting his electric > bike > project here: > http://www.recumbents.com/WISIL/shumaker/default.htm > > He has a cnc Sherline style micro mill with a brushless outrunner motor on > the > spindle: > http://www.recumbents.com/WISIL/shumaker/CNC1.jpg > > I highly recommend reading his informative posts and maybe even shoot him an > email about how he is controlling the spindle. > > Tom >
Ian, I found an inexpensive motor and esc here on ebay that represents a point of departure for experimentation. http://cgi.ebay.com/AVEOX-1406-4Y-GEARED-BRUSHLESS-MOTOR-W-L260-ESC- RECON_W0QQitemZ250528575746QQcmdZViewItemQQptZRadio_Control_Parts_Accessories? hash=item3a54aab102#ht_500wt_1182 good luck, Tom ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
