Online Identification of Inductance and Flux Linkage for Inverter-fed SPMSMs Using Switching State Functions

• Published in: IEEE transactions on power electronics Vol. 38; no. 1; pp. 1 - 13
• Main Authors: Huang, Xiaoyan, Yu, Yelong, Li, Zhaokai, Chen, Zhuo, Huang, Shaopo, Niu, Feng, Zhang, Jian
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.01.2023; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Back electromotive force; Circuits; Coils; Couplings; Data buses; Electric potential; Electromotive forces; Impact resistance; Inductance; Inverters; Low speed; Parameter estimation; Parameter identification; Permanent magnet motors; Permanent magnets; Position errors; Rotors; Stators; Surface-mounted permanent magnet synchronous motors (SPMSMs); Switches; Switching; switching state functions; Synchronous motors; Voltage; Voltage measurement
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2022.3206119

This paper presents an online method to acquire the stator inductance and flux linkage for inverter-fed surface-mounted permanent magnet synchronous motors (SPMSMs) using switching state functions instead of average models. Given the switching state functions when different voltage vectors are applied to the motors, the information of inductance and flux linkage is revealed. Based on the DC bus voltage and current derivatives obtained from either hardware methods like Rogowski Coil and differential circuit, or software methods such as tracking differentiator, stator inductance and flux linkage are able to be figured out directly using the redundant or more practical methods with the help of recursive least square (RLS). Simulations and experiments are carried out to prove the effectiveness of proposed methods, besides, DC voltage and operating speed variation as well as the impact of resistance are taken into account. Finally, compared with the conventional parameter identification based on the average models either in α-β or d - q coordinate, the proposed methods with switching state functions have remarkable advantages especially when the rotor position error exists. What need further efforts is about the challenging case at very low speed, e.g., it is hard to identify flux linkage due to the small back EMF.