Andy Pugh wrote: > I just found this application note from Atmel > http://www.atmel.com/dyn/resources/prod_documents/doc2592.pdf > The problem with all of these designs is they have no current loop control. I could be wrong, but I think you really need closed-loop current (torque) control for this to work well. If you do this in voltage-mode control (just adjusting the PWM duty cycle without sensing motor current) then I think you will find that the loop becomes very hard to tune near zero speed, where the requirement for PWM duty cycle will be VERY low. This is how my drives work, but since they are only doing trapezoidal drive, you don't have to impose the sinusoidal drive waveforms on top of that already small pulse width.
Jon ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
