Lebowski said:
For me FOC means that (when powering) the motor current vector is lined up with the Back EMF vector
Could you please explain that a little bit further ? The back EMF will probably not be a sinusoid, so what is the back EMF vector based on ?
i.e. from what basis is it calculated ? Is it based on an average/RMS/best fit of a sinusoid to the back EMF waveform ? Or taking the zero crossing points of the back EMF as a reference ? Something else?
Assuming that the Clarke and Park transforms use sine wave parameters, how are they derived from non-sine signals?
Does the controller produce a sinusoidal profile, or does it match the back EMF waveform ? I thought that FOC produced a sinusoidal wave, and adjusted the timing accordingly. Now I'm not sure if that's correct.
I think I'm in one of those situations where the more I learn, the less I know...
Thanks for taking the time to educate us. This is a really good topic.