On 11 June 2010 18:20, John Kasunich <[email protected]> wrote: Firstly, let me make it clear that I don't intend that the component will reverse the motor in any other way than by changing the lead angle. What follows is purely academic.
> I haven't taken the time to read the code in detail, so I might be > confused. But I don't think inverting all three phase signals will > reverse the motor. The normal way of reversing a three phase motor > when running across the line is to swap any TWO of the three phase > wires. That will reverse the phase rotation. In this case the situation is a little different, as the phase pattern applied to the motor is a function of the motor position, rather than is the case with a normal 3-phase motor where the phase pattern does the same thing regardless. The output of the module is a set of PWM duty-cycles where +ve means "turn on the high-side driver" and -ve means "turn on the low-side driver" I think in this case negating the input is equivalent to swapping the +ve and -ve leads into the drive (but without the smoke and sparks this would normally cause) > Isn't this a brand new component? Spare yourself the pain of making > the diff (and us the pain of reading it). Just post the component > itself. Good point, well made. -- 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
