On 22 April 2011 17:12, Eric Keller <eekel...@psu.edu> wrote: > Where does the motor feedback enter the system with an 8i20? I just > scanned the manual, and I didn't really see a diagram.
Typically the Hall sensors and the encoder counts would be connected to the "bldc" HAL component. Then when the motor is first moved it will be controlled trapezoidally until the first Hall transition, at which point the bldc component has enough information about the relationship between the encoder counts and the motor rotor angle to start commutating sinusoidally. > Are you aware of anyone using the 8i20 in an EMC2 system? Yes, I am. (I had to write the 8i20 driver and the bldc component to do so, and documentation is a bit sparse, but it works) http://www.youtube.com/watch?v=1LvdrHvGxJ8 The eagle-eyed will spot that there is no feedback back from that motor, and it is in fact running as a sort of many-times microstepping, 6-step-per-rev stepper motor in the video. I do now have it working properly using my Resolver convertor and the bldc component in proper closed-loop PID control. It has even moved my mill knee. (but only down…) -- 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
