On Fri, 2010-11-12 at 17:34 +0000, Andy Pugh wrote: > On 12 November 2010 17:12, Mario. <[email protected]> wrote: > > > And as for "flat-topped sine wave, are you sure it is NOT a space > vector wave? When I did SVPWM on PIC18F452 some 6 years ago, it made a > lovely sine wave measured from phase to phase, > > Surely what you are describing there is more related to the drive then > to the motor though? > > Anyway, none of this matters to my HAL component, the inputs, outputs > and modes are exactly the same regardless of subtle motor or drive > differences.
Without extensive knowledge, I'm guessing that the reason it doesn't matter is because of the positional encoder feedback keeps the motor position within planned limits. I think the thrust of the BLDC and PMAC issue is that they employ different magnet/coil layout in order to try to get a constant torque throughout a rotation, given a constant trapezoidal (DC) or sine (AC) input. Depending on whom you ask, these motor types could be considered _completely_ different. It might also matter when the motor driver is near it's limits and control overhead starts to fade. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Centralized Desktop Delivery: Dell and VMware Reference Architecture Simplifying enterprise desktop deployment and management using Dell EqualLogic storage and VMware View: A highly scalable, end-to-end client virtualization framework. Read more! http://p.sf.net/sfu/dell-eql-dev2dev _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
