Research on Stator Magnetic Field Orientation Method for Quasi-Synchronous Operation of Doubly-Fed Linear Motor
Based on the analysis of aerodynamic noise characteristics and acoustic tests of self-ventilated traction motors, the main noise sources were determined, the steady-state
For high-speed maglev applications, the doubly-fed linear motor (DFLM) adopts a quasi-synchronous operation (QSO) control framework, with scalar control on the stator side and vector control on the mover side. However, as the basic requirement of the DFLM-QSO, the magnetic field orientation faces two major challenges. Firstly, under levitation conditions, the mover’s magnetic motive force (MMF) is significantly stronger than that of the stator, causing the stator’s magnetic field to be overwhelmed by the mover’s, and making it difficult to accurately determine the stator’s magnetic field angle. Secondly, to maintain wideband stability in AC levitation, harmonic injection is required in the mover current, necessitating a magnetic field orientation method with superior dynamic performance.
To address these challenges, this paper proposes a novel stator magnetic field orientation method based on a mover-consolidated α-β coordinate system, along with a corresponding parameter correction scheme. As shown in Figure 1, this method estimates the stator current in real time within the α-β coordinate system and adjusts the orientation angle of the mover’s synchronous magnetic field coordinate system through the closed-loop control, ensuring that the T-axis component of the stator current converges to zero, thereby achieving magnetic field orientation. Additionally, the parameter correction method enhances the accuracy of mover-side parameters, enabling precise extraction of the stator’s induced voltage within the mover windings, even when the induced voltage is relatively small. This method demonstrates excellent dynamic performance, maintaining stable magnetic field orientation even under harmonic injection in the mover current.
Figure.1 Block diagram of stator magnetic field orientation method
Experimental results further validate the effectiveness of this approach. As illustrated in Figure 2, the T-axis component of the stator current converges and stabilizes at 0 A during the magnetic field orientation process. When the reference current vector angles of the stator and mover are set to 0° and 90°, respectively, the oscilloscope waveforms show that the phase difference between the two currents remains precisely at 0° and 90°, confirming the accurate orientation of the stator’s magnetic field.
Figure.2 Magnetic field orientation verification experiment
This study effectively resolves the challenge of stator magnetic field orientation in DFLMs under high-speed maglev conditions, laying a solid foundation for decoupled control of traction, levitation, and power supply. It holds significant theoretical value and engineering potential for future high-speed maglev systems.
--本文由作者团队供稿
支持基金：
National Natural Science Foundation of China (52202448)
论文链接：
http://www.motor-abc.cn/djykzyy/article/abstract/20241101
推荐引用格式：
陈鸿, 王修森, 王业勤, 钟再敏. 准同步运行双馈直线电机定子磁场定向方法研究[J]. 电机与控制应用, 2024, 51(11): 1-10.
CHEN Hong, WANG Xiusen, WANG Yeqin, ZHONG Zaimin. Research on Stator Magnetic Field Orientation Method for Quasi-Synchronous Operation of Doubly-Fed Linear Motor[J]. Electric Machines & Control Application, 2024, 51(11): 1-10.
Hong Chen received the B.S. degree from the School of Automotive Studies, Tongji University, in 2023. He is currently pursuing the M.S. degree with the School of Automotive Studies, Tongji University. His current research interests include motor control.
Xiusen Wang received the B.S. degree from the School of Automotive Studies, Tongji University, in 2021. He is currently pursuing the Ph.D. degree with the School of Automotive Studies, Tongji University. His current research interests include motor control.
Yeqin Wang received the B.Eng. degree from the College of Engineering, China Agricultural University, in 2009, the M.Eng. degree from the School of Automotive Studies, Tongji University, in 2012, and the Ph.D. degree from the National Wind Institute, Texas Tech University, USA, in 2019. He is currently an Assistant Professor with the School of Automotive Studies, Tongji University. His current research interests include electric drive system and power electronics control.
Zaimin Zhong received the B.S. and Ph.D. degrees in vehicle engineering from the Beijing Institute of Technology, Beijing, China, in 1995 and 2000, respectively. He is currently a Professor at Tongji University. His current research interests include automotive electric drive and transportation electrification.
