Annular hollow NdFeB magnetic ring is a hollow ring-shaped permanent magnet component made of high-performance NdFeB rare earth magnetic materials through precision molding and finishing processing. It has a standard circular ring structure with a solid outer ring and hollow inner hole, featuring uniform circumferential magnetic field, high magnetic field density and stable magnetic symmetry. As a key special-shaped magnet in NdFeB series products, the hollow annular structure makes it different from solid magnets, which can be sleeved on rotating shafts, cylindrical parts and linear transmission components, and is widely used in rotary power equipment, magnetic induction devices and precision transmission systems. According to different processing technologies, annular hollow NdFeB magnetic rings are divided into sintered magnetic rings and bonded magnetic rings. Sintered magnetic rings have higher magnetic performance and structural strength, suitable for high-power and high-precision equipment; bonded magnetic rings have better molding consistency and dimensional accuracy, suitable for miniaturized precision equipment.

In terms of performance and structural characteristics, annular hollow NdFeB magnetic rings have ultra-high magnetic energy product and remanence, with concentrated and uniform circumferential magnetic field distribution, no magnetic field dead angle, and good magnetic symmetry, which can provide stable and continuous circular magnetic field induction for rotating equipment. The hollow inner hole design realizes the sleeved installation mode, which can be directly nested on motor shafts, transmission shafts and sensor mandrels, saving installation space and realizing compact equipment structure. The product has excellent high-temperature resistance and anti-demagnetization performance. High-grade high-temperature resistant models can work stably at 180℃-220℃ for a long time, with almost no magnetic attenuation, adapting to the high-temperature heat generation environment of motors and power equipment. After precision finishing, the inner and outer circles of the magnetic ring have high dimensional accuracy and smooth surface, with small assembly gap and good rotation coordination. The surface is treated with multi-layer electroplating, which effectively prevents oxidation and corrosion, and improves the wear resistance and service life of the product during high-speed rotation.

Annular hollow NdFeB magnetic rings are mainly applied in high-end power equipment, precision transmission devices and magnetic induction systems. In the motor industry, they are the core magnetic components of permanent magnet synchronous motors, brushless DC motors, servo motors and micro drive motors. The hollow ring structure matches the rotor rotating shaft perfectly, providing stable magnetic field power for motor rotation and improving motor efficiency and power density. In the sensor industry, annular NdFeB magnetic rings are used for magnetic encoding sensors, rotation angle sensors, speed sensors and position sensors, realizing accurate magnetic induction and signal conversion through uniform circular magnetic field changes. In addition, they are also widely used in magnetic coupling transmission devices, mechanical damping equipment, aerospace precision instruments, new energy vehicle motor systems and industrial automation transmission equipment. With the rapid development of high-efficiency motors and intelligent sensing technology, the demand for high-precision and high-stability annular hollow NdFeB magnetic rings is continuously increasing, becoming an indispensable core component in the field of high-end power transmission and intelligent detection.