On 01/30/2015 06:54 AM, andy pugh wrote: > On 30 January 2015 at 12:33, Marius Liebenberg <[email protected]> wrote: >> 196V @ 8.5A and looks like a resolver feedback. These are the Lafert. The >> others I have not seen yet. > That sounds a lot like what I have on my mill. > > Pico-systems have a 160V / 20A servo drive that can probably be made > to work along with their resolver-to-quadrature converter. I think you > would need advice from Jon as to how to commutate using the converter. > It may be that the bldc component can help there. Our current version of the resolver converter produces quadrature (ie. incremental) position. It does have an absolute binary output as 12 CMOS-level bits available on a header. I have thought about adding a feature to create the industry standard "Hall signals", but as this needs to accommodate the number of motor poles and maybe alignment offsets between motor and resolver shafts, it gets complicated. BLDC does apparently have a sensorless mode where it can get the motor moving by trying different windings, and then get in sync once the index pulse is seen. > > There are drives from the likes of AMC that take +/-10V command and > hall signal patterns. The bldc component can convert resolver feedback > from the 7i49 to hall patterns. This might also work with the Pico > drives, but I think that they are PWM controlled rather than analogue. Yes, our drives take a digital PWM signal.
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