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 -- An idealist is one who, on noticing that a rose smells better than a cabbage, concludes that it will also make a better soup. -- H.L. Mencken ------------------------------------------------------------------------------ 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
