At 04:25 PM 8/6/01 -0400, you wrote: > >Feedback is what you need. Simply sense the RPM and control it with PWM. >You will get close to the full torque at any RPM. At slow speeds however, >you will not have the benefit of the armatures inertia. For momentarily >applied loads this often get confused with torque. Rather than going to the trouble and cost of a tachometer, simply measuring the armature current allows you to boost the voltage to compensate. Best regards, =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Spehro Pefhany --"it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com Contributions invited->The AVR-gcc FAQ is at: http://www.bluecollarlinux.com =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics