Toward Reducing Undesired Rotation Torque in Maglev Permanent Magnet Synchronous Linear Motor

Feng Xing, Xiaoyu Song, Yuge Gao and Chaoning Zhang ()
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Feng Xing: School of Electrical Engineering, Liaoning University of Technology, Jinzhou 121001, China
Xiaoyu Song: School of Electrical Engineering, Liaoning University of Technology, Jinzhou 121001, China
Yuge Gao: School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
Chaoning Zhang: Department of Artificial Intelligence, Kyung Hee University, Seoul 02447, Republic of Korea

Energies, 2023, vol. 16, issue 16, 1-20

Abstract: The dq current transformation method can be used to achieve the drive control of the maglev permanent magnet synchronous linear motor (MPMSLM). Specifically, the control of the suspension force F z can be achieved by controlling the d -axis current, and the control of the thrust force F x can be achieved by controlling the q -axis current. However, the direct use of the dq current transformation method on traditional MPMSLM structures produces an additional rotation torque around the y -axis. In order to reduce this additional torque, a new MPMSLM structure is proposed in this work. First, the characteristics of additional torque through finite element analysis are analyzed. Second, the Halbach permanent magnet array and coil size are optimized, and the topology of the MPMSLM coil is designed to reduce the additional torque. The decoupling performance and current of the proposed MPMSLM are experimentally verified through open-loop experiments using finite element simulation software. Finally, the decoupling algorithm of the generalized inverse matrix is used to achieve the decoupling between forces F x and F z and torque T y and the d -axis and q -axis currents in each drive unit. Based on this, a three-degree-of-freedom closed-loop control system of the MPMSLM is designed. The LabVIEW 2018 software is used for the simulation analysis of the three-degree-of-freedom MPMSLM motion control system, and the results show that the proposed motor structure has superior closed-loop control performance.

Keywords: dq current transformation; MPMSLM; additional torque; three degrees of freedom (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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