Sintered neodymium iron boron radiation (multi-pole) magnetic rings are a new product developed in recent years and another new direction for the development of sintered neodymium iron boron permanent magnetic materials. Mainly used in high-performance permanent magnet motors and sensors, it has the advantages of high accuracy, smooth operation, and low noise, making it the preferred choice for high speed and high-precision control of motors. The surface magnetic curve of sintered neodymium iron boron multipole magnetic ring (as shown in the figure below) is distributed in a sine wave shape, and its ultra-high surface magnetic field can greatly improve the efficiency of the motor. Without reducing efficiency, the motor can be further lightweight and miniaturized. Sintered neodymium iron boron radiation (multipole) magnetic rings overcome the drawbacks of splicing magnetic rings and can replace traditional tile shaped blocks. Sintered neodymium iron boron multipole magnetic rings have advantages such as ultra-high surface magnetic field, simplified assembly, stable magnetic circuit, higher mechanical accuracy, assembly with non-conductive magnetic shaft rods, without reducing magnetic performance, and achieving efficient utilization of permanent magnet materials.