On 09/30/2015 10:55 AM, Roland Jollivet wrote: > > And does anyone know why Gecko has shied away from 3ph drives? It seems a > step away from 2 phases ;-) > > Yes, Mariss mentioned this years ago. In a simple drive with minimal configuration setup, the only reasonable way to go is a six step drive. these have small 'bumps" when the commutation jumps to the next set of coils. he didn't like that. The fix is sinusoidal drive, which takes a lot more processing in the drive, and requires a setup so the drive knows how many poles the motor has, and the encoder resolution. there are LOTS of sinusoidal drives now on the market, they usually have some DSP processor to do the math, and need a setup program to download the motor settings into non-volatile memory in the drive. This is WAY more complexity than the types of stepper and step-servo drives that Gecko is making.
I make a six-step drive, and the "bump" really isn't that bad with most motors, but it definitely is detectable in the encoder response. Jon ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
