Ian Wright <watchm...@...> writes: > > Hi, > > I'm looking for inspiration as to how I can use a 12 volt > 6-8 Amp motor > to drive my mini-mill spindle. I'm currently using an old > mains voltage > teleprinter motor which, although it does the job admirably, > is as noisy > as hell and I have to leave the room while it screeches > away. I've now > got this nice little 12 pole 12 volt motor which should do > the job > better and quieter but, while I am fitting it, I would like > to get some > automatic control over its speed. So, does anyone know of any > schematics/circuits which I could build to allow me to hook > the motor up > to EMC2 and send it meaningful M3 / M4's? > > Ian > -------------------- > Ian W. Wright > Sheffield UK
Hello Ian, Since you mention "schematics/circuits" I am assuming that you intend to build your own H bridge controller for the 12V spindle motor that you have. True? If so, you will need to decide on what control signal (0-10-vdc + dir, pwm + dir) you will use. If, for example, you decide to use 0-10vdc + dir then you will need to decide how to output it (CNC4PC, Mesa 5i20, motenc, etc.) and how to properly isolate it so that switching noise from the spindle amplifier/H-bridge & motor commutator does not interfere with the logic side of your controls. Once you have an isolated spindle control signal, then you can adapt any number of H bridge controllers to use that signal. The Unitrode UC1637 is an H bridge controller that can be configured to use a 0-10v control signal, and could be used to control a homebrew H bridge consisting of P channel high side / N channel low side mosfets. See the datasheet here: http://www.iutenligne.net/ressources/etudes_realisations/Lequeu/kart/pdf/SLUA13 7.pdf Here is a link to an open source dc servo design discussion that might help. http://www.cnczone.com/forums/showthread.php?t=25929 Good luck, Tom ------------------------------------------------------------------------------ Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT is a gathering of tech-side developers & brand creativity professionals. Meet the minds behind Google Creative Lab, Visual Complexity, Processing, & iPhoneDevCamp as they present alongside digital heavyweights like Barbarian Group, R/GA, & Big Spaceship. http://p.sf.net/sfu/creativitycat-com _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
