I am running a motor using sensorless FOC in PID speed control mode.
The problem i have is: after certain load point motor oscillates and motor current sharply raises and falls for few seconds, during this time d axis currents is fluctuating. once the d axis current stabilizes, motor maintains speed and motor current, d axis current increases with load.
what should i try to remove speed and d axis current oscillations.
I was able to reduce the oscillations by changing speed PID values in PID controllers settings, but motor overall efficiency significantly dropped and small oscillations still preset, though the peak current is reduced from 125A to 80A, as seen in attached image.
thanks for any Hints!