Indeed, FWIW, it's called "dynamic braking". Yeat another UBI (Useless Bit of Information) :)
On 04/06/2010 07:39 AM, Erik Christiansen wrote: > On Mon, Apr 05, 2010 at 06:08:15PM +0200, Jan de Kruyf wrote: > >> Hallo, >> The accepted wisdom with commutator d.c. servo motors was always to >> have a contactor break the motor wires and short the motor armature >> through a resistor. The shorting of the armature works as a brake to >> stop the motors reasonably quick. The resistor in series is needed so >> the armature shorting current does not become greater than the >> demagnetizing current of the permanent magnets. 2 or 3 times maximum >> stall current should be ok. >> > I hadn't thought of that, and like it a lot. It's simple, and doesn't muck > with the power supply. It does though require a DPDT relay for each > motor, or an 8PDT relay for all four. Fortunately, I have a tube of 25A > DPDT relays in the junkbox. > > Choices. :-) > > Erik > > ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
