On 22 April 2011 22:26, Robert Pabon <robertpa...@corseusa.com> wrote: > Man my head is starting to spin! No wonder people just go with steppers and > call it a day. Maybe my vision is clouded by ignorance but it doesn't seem > like it should be that hard to pick up a brushless DC motor, a suitable amp > and make it work.
The issue is that to commmutate a brushless motor the drive needs to know the rotor position. There are lots of ways that that information can be transmitted, and the manufacturers seem to like to choose deliberately incompatible methods (possibly so that they can guarantee motor and drive compatibility). > http://www.servodynamics.com/Drawing/23S-IE.pdf Looks good. No wierdness there, just conventional Hall sensors and an incremental encoder. That's about as easy as it gets. > http://www.a-m-c.com/download/datasheet/bd30a8.pdf That one looks a little easier than the other, as it takes a PWM input rather than an analogue voltage. It claims to allow you to swap the hall phasing between 60 and 120 degrees, so combined with the 6 possible ways to connect the halls and the 6 possible ways to connect the power cables I think all possibilities are covered. The drawback of the AMC drive you linked is that it only goes up to 80V. How much are they? -- atp "Torque wrenches are for the obedience of fools and the guidance of wise men" ------------------------------------------------------------------------------ Fulfilling the Lean Software Promise Lean software platforms are now widely adopted and the benefits have been demonstrated beyond question. Learn why your peers are replacing JEE containers with lightweight application servers - and what you can gain from the move. http://p.sf.net/sfu/vmware-sfemails _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
