I just found this application note from Atmel http://www.atmel.com/dyn/resources/prod_documents/doc2592.pdf Which seems to describe how to do almost exactly what we want to do. This is trapezoidal control, whilst sinusoidal control would be preferred, but would appear to offer a way to control a high voltage brushless servo using a $20 Arduino (or a $3 AVR chip by itself) and a $20 Smart Power Module.
As an add-on to the resolver converter it is a non-starter as initially described, the free-running loop that watches the PWM output is incompatible with the free-running loop that calculates resolver position, but the example using an external OR gate to combine the hardware-generated PWM and the software-generated high-side/low-side pattern is definitely do-able. In fact I think I will pick up a couple of quad NAND gates on the way home tonight (Maplin are out of stock of OR's) and see what I can produce. -- atp ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
