celeron55: Yes, I agree, ifw is limited so never goes below -100.
johu: Ok, that makes sens with the rest of the sw.
Regarding this plot from yesterday.
- Currents on left axis, voltages on right axis
When looking closely one can see that Ud reaches its limit before the Id colapses. On other plots in this thread also the opposite appears, Ud reaches its limit after Id colapses. However, Uq always rises the exact moment Id colapses, which I think is a bit strange.
Another question is why there are no step in Iq, but still a step in Uq. To my understanding, Uq is calculated from Iq, so this does not add up.
Changing the syncadv factor increased torque and power delivery but still shows the same behavior regarding Id colapsing and a large step in Uq.
This really is strange to me.
Would be very interesting to see similar plots from other motor/inverter combinations to find out if this only happends to the MGR or to other motors as well. The MGR does not have very much power so might be why it becomes very noticable for this motor.
Just for the fun of it I made some crude measured of the motor parameters as per previously posted document. I used a 50A current transducer and put my low resolution scope probe directly on it. Would proably be better if I used a amplifier in between.
Anyway, the results:
Winding resistance for one leg: 75mohm
Ld = 2,15mH
Lq = 6,33mH
Flux linkage = 0,108 Weber
This results in LqminusLq = 4,18mH
Looking at the Id/Iq distribution from these and it is almost identical as with the parameters used by the SW so thats great.
The Id/Iq distribution seem to be correct and not really have anything to do with the Id colapse.
Will keep looking for more clues to this, any pointer much appreciated.