Analysis of synergistic stator permanent magnet machine with the synergies of flux-switching and flux-reversal effects

• Main Authors: Cai, Shun, Chen, Hao, Yuan, Xin, Wang, Yun-Chong, Shen, Jian-Xin, Lee, Christopher Ho Tin
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2022
• Subjects: Engineering::Electrical and electronic engineering; Dual Permanent Magnet Machine; Flux Reversal Effect
• Online Access: https://hdl.handle.net/10356/160161
• Institution: Nanyang Technological University

Dual permanent magnet (PM) machines have attracted numerous interests due to the high torque density and compact volume. This paper investigates a synergistic PM machines with the synergies of flux switching and flux reversal effects. The flux-reversal and flux-switching PM flux paths circulate from two sides of the split teeth separately, which avoid the over-saturation with dual PM excitations. The preferred stator and rotor pole number is derived from a simplified analytical model and the influence of leading parameters is analyzed as design guidelines. Furthermore, the synergistic stator PM machine is optimized and compared with flux-switching PM (FSPM) machines. It is revealed that the synergistic stator PM machine exhibits ~20%, ~10%, and ~17% higher torque density than conventional FSPM machine, C-core FSPM machine, and E-core FSPM machine, respectively. Besides, good flux weakening capability is achieved with a larger inductance than conventional FSPM machine, and higher efficiency is obtained at both low-speed and high-speed operations. Finally, an experimental prototype is fabricated to validate the proposed concepts.