Online Identification of Flux Linkage Based on FPGA for Permanent Magnet Synchronous Motor Current Decouple Control

The cross-coupling of online multi-parameter identification caused by the rank-deficient of the mathematical model of permanent magnet synchronous motor (PMSM) affects the torque and speed performance. For the online identification of PMSM flux linkage, a method based on look-up table is proposed to realize accurate observation of flux linkage in this paper. In order to verify the correctness of the method, a PMSM dragging platform based on FPGA controller is established to carry out experiments. Analyzed results show that the current feedback decoupling method of d-q axis improves the response performance of current and torque. Moreover, after obtaining the accurate flux linkage parameters, the overshoot of speed and current is reduced to a certain extent, and the control performance of the motor is improved.