Pole-Changing Field Modulation Permanent Magnet Motor Based on Magnetomotive Force Offset

作者：Yi Du, Zhuofan He, Feng Xiao, Xiaoyong Zhu, Chao Zhang, Li Quan · 发表于：IEEE Transactions on Energy Conversion · 年份：2024 · DOI：10.1109/tec.2024.3369077 · 被引用次数：8 · 研究领域：Electric Motor Design and Analysis、Magnetic Bearings and Levitation Dynamics、Sensorless Control of Electric Motors

This paper proposes a new pole-changing (PC) design method for rotor-permanent-magnet (RPM) motors based on magnetomotive force (MMF) offset (MMFO), which is realized by offsetting the magnetic pole positions of permanent magnet (PM) MMF to introduce even-order harmonics. The newly introduced PM MMF harmonics and the original PM MMF harmonics can both interact with the air-gap permeance harmonics to generate PM air-gap flux density harmonics with different slot phasor diagrams, making it possible to realize PC. The design principle of MMFO is specifically investigated, based on which a PC-MMFO motor using modular MMFO structure is further proposed. The operating principle of the PC-MMFO motor is then discussed. By finite element analysis, the motor performance is analyzed and verified by experiments. The results show that the proposed motor possesses a high torque and a wide high-efficiency speed regulation range.