Design and Modeling of a Novel Permanent Magnet Width Modulation Secondary for Permanent Magnet Linear Synchronous Motor

• Published in: IEEE transactions on industrial electronics (1982) Vol. 69; no. 3; pp. 2749 - 2758
• Main Authors: Zhang, Zijiao, Luo, Meizhu, Duan, Ji-an, Kou, Baoquan
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-03-2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Electric motors; High speed; High-speed motor; Iron; Low thrust; low thrust ripple; Magnetic fields; Magnetic properties; Magnetism; Magnetization; Mathematical models; Modulation; permanent magnet (PM) width modulation secondary; Permanent magnet motors; Permanent magnets; PM linear synchronous motor (PMLSM); Pulse duration; Ripples; Synchronous motors; Topology
• ISSN: 0278-0046; 1557-9948
• DOI: 10.1109/TIE.2021.3065625

High-speed linear motor with low thrust ripple is one of the research focuses of high-performance systems. This article proposes a novel secondary topology for permanent magnet (PM) linear synchronous motor (PMLSM) with high speed, to suppress the thrust ripple. PM width modulation secondary adopts several PMs to excite the main magnetic field per pole. The issues from a big pole pitch, which is generally used by high-speed PMLSM, are solved. These PMs have various longitudinal lengths based on the pulsewidth modulation principle, to achieve a magnetic field with excellent sinusoidal features. First, the topology structure of PM width modulation secondary is designed. The analytical model of the main magnetic field excited by PMs in this novel secondary is established, and the electromagnetic thrust is calculated. Furthermore, the influences of PM width modulation secondary on the main magnetic field and thrust properties are analyzed. The comparisons between two PMLSMs employing PM width modulation secondary and Halbach secondary, respectively, are provided. Finally, prototypes are manufactured and tested, to verify the effectiveness of the topology proposed in this article.