On 1/7/2010 5:40 AM, Andy Pugh wrote: > 2010/1/7 Chris Morley<chrisinnana...@hotmail.com>: > > >>> There was a company in BC Canada selling small brushless servo motor >>> systems very cheaply. >>> > >> Yes what is the link please? >> > I think he is referring to > http://www.dmm-tech.com/ > Which do look tempting. > > Anyway, my take on how brushless servos work: > > They are effectively just the same as a DC servo, except instead of > the commutator determining which windings are energised, and in which > direction, the driver board does that using the hall sensors to > determine the rotor position. > > So, the hall sensors tell the drive which wires to energise to achieve > clockwise or anticlockwise torque, and the feedback controller (either > in the drive, or in EMC, or anywhere else you choose to run it) > decides how much torque and in what direction is needed to achieve > position. > > That's the one. I had an email exchange with one guy at the company and he certainly seems knowledgible.
I see they have a new 900 peak watt servo drive/motor now for $328!? Their prices are very good. They were selling on Ebay - might want to check their feedback. Has anyone used some of the TECO servo drives and motors that MachMotion.com is selling. Tom, the same guy that distributes Rutex in the US runs that website. For a servo drive package, those are the cheapest I have seen. I was tempted to spec them for a waterjet retrofit I need to do soon, but I chickened out and spec'ed AD drives instead as I know they work. Dave ------------------------------------------------------------------------------ This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers http://p.sf.net/sfu/verizon-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
