On 10 June 2010 01:41, Neil Baylis <[email protected]> wrote: > My question was trying to ascertain how much improvement you saw, relative > to Trapezoidal commutation.
As I have not managed to get Trapezoidal commutation working properly for this motor, then the improvement is enormous. > I was under the impression that the 7i93 already did Trapezoidal commutation. > Otherwise, what kind of motors does it drive? My understanding is that the 7i39 is a "dumb" drive and doesn't drive any sort of motor without suitable host software. Until recently the 7i39 was only supported by SoftDMC, not by EMC2. > When you rotate your motor shaft by hand, (open circuit) do you feel > cogging? If so, then it's not ironless, and would be more difficult to > control smoothly, especially at low speeds. I have had the motor apart, and the rotor is a bunch of magnets glued to a shaft. Interestingly I checked the specs of the servo I have fitted: it is a 100 oz-in (0.7 Nm) 140W servo and can move the fairly heavy Z at 2000mm.min whilst the 2.5Nm stepper can move it at 660mm/min. -- atp ------------------------------------------------------------------------------ ThinkGeek and WIRED's GeekDad team up for the Ultimate GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the lucky parental unit. See the prize list and enter to win: http://p.sf.net/sfu/thinkgeek-promo _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
