Saturated dq-Axis Inductance Offline Identification Method for SynRM Based on a Novel Active Flux Observer Orientation

The precision of motor parameters directly affects the control performance of SynRMs drive system. Currently, high-frequency injection methods often generate noise and are unsuitable for high-power and low carrier wave ratio scenarios. Meanwhile, model-based methods can only identify the saturation characteristics of the
L_d
without calibration bench loading. This letter proposes an identification method based on a novel active flux observer orientation, which does not require high-frequency injection or calibration bench loading to identify the saturation characteristics of
dq
-axis inductance. During identification
L_d
, the active flux observer adopts
d
-axis orientation and identifies the saturation values of
L_d
by applying different
i_d
. When identifying the
L_q
, the active flux observer adopts negative
q
-axis orientation, and the output of the speed loop is used as the input for the
d
-axis current loop. By applying different
i_q
, the saturation values of
L_q
are identified. Experimental results show the validity of the proposed method.