Recently, much research has been conducted on non-rare-earth magnet motors due to limited reserves and high prices of rare-earth materials. Among them, a magnetic flux concentrating motor using a ferrite magnet is being commercialized in many parts. However, it is disadvantageous to high-speed operation due to the structure of the rotor. In this paper, we propose a hybrid structure of a magnetic flux concentrating and an axial motor to solve this problem and named it FC-AFPM motor. In the axial direction motor, the axes for generating torque and centrifugal force are separated from each other to ensure mechanical stability. FC-AFPM can increase the power density by using ferrite magnets, and is excellent in mechanical stability and suitable for high-speed high-torque applications. Double-sided and Single-sided FC-AFPM motor were designed and evaluated, and the validity of the proposed new structure was verified.
This work was supported by the Energy Efficiency & Resources of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Trade, Industry & Energy (No. 20172010105920