4-pole alignment ring-shaped magnet for automobile dc motor

Recently, high performance anisotropic NdFeB bonded magnets, named MAGFINE, were investigated for small motors used in automobiles. This paper discusses the success in developing a new 4-pole dc brush motor using MAGFINE, with 50% weight and volume reduction while maintaining the same motor characteristics as conventional motors. The 4-pole alignment method makes it possible to mold a long ring-shaped magnet with high performance for use in automobile motors. The motor using the 4-pole alignment magnet has reduced cogging torque while maintaining high motor performance. Therefore, the magnet with 4-pole alignment makes it possible to produce a high performance and small-sized dc brush motor for automobile applications with high cost performance.