Effects of Triangular Wave Injection and Current Differential Terms on Multiparameter Identification for PMSM

Permanent magnet synchronous motor (PMSM) has been widely used in industry in recent years because of its simple structure, high power density, and high efficiency. Accurate electromagnetic parameters of PMSM are of great significance in many fields, such as control system design, fault diagnosis, and condition monitoring. However, when the motor is in steady-state operation, the traditional identification method will have the issues, such as model accuracy, rank deficient, and the incompletely observable. Therefore, a parameter identification method based on biased triangular wave injection and current differential term is proposed in this article to solve them. In addition, the influence of triangular wave injection and current differential term on motor parameter identification is comparatively analyzed and verified by comparative experiments. Finally, the experimental results show that the proposed method can realize the multiparameter identification of motor resistance, inductance, and flux linkage in steady-state operation.