Question:
How can the torque characteristic in the lower speed range be optimised?
Answer:
Apart from the known methods of optimisation by manually adjusting motor stator resistance C0084 and/or motor stator inductance C0092 there is a third method which consists of manually adjusting motor cos phi C0091.
If the torque achieved with the default settings after an identification run is not sufficient, a torque increase of approx. 10…20 % can be achieved, particularly in the lower frequency range, by reducing cos phi by approx. 5 %.
Reduce value in C0091 => Torque increases at low speeds
Since the value of cos phi is used for the internal calculation of leakage inductance of the motor (primary losses), one must remember that any manual change in C0091 always necessitates a repeat identification run, as opposed to a change in main inductance C0092.
The values determined in this way are then also sent during the parameter set transfer.
