Through-hole ring NdFeB magnets are hollow annular permanent magnets with central through holes, made of high-performance neodymium iron boron magnetic materials. The product has a regular circular ring structure, with a complete through hole in the center, uniform outer circle and inner hole roundness, flat and smooth upper and lower end faces. It is a kind of annular fixed magnetic component integrating adsorption function and assembly and fixing function. Through-hole ring NdFeB magnets have ultra-high magnetic energy product, strong magnetic force, stable performance and high assembly precision, and are widely used in motor equipment, sensor accessories, mechanical fixing, electronic equipment and new energy fields.

The production process of through-hole ring NdFeB magnets is precise and standardized, including NdFeB raw material sintering, annular blank cutting, central through-hole precise drilling, inner and outer circle fine grinding, double-sided flat grinding, edge chamfering, surface anti-corrosion electroplating and high-strength magnetization. The core processing links are inner hole drilling and inner and outer circle finishing. Professional precision drilling equipment is adopted to ensure that the central through hole is smooth and vertical, the hole wall is flat and burr-free, and the aperture tolerance is small, which is convenient for shaft penetration and bolt fixing. The inner and outer circle fine grinding process ensures the uniformity of the outer diameter and inner aperture of the ring magnet, standard roundness and good concentricity, avoiding magnetic field deviation and assembly deviation caused by concentricity errors. After saturation magnetization, the magnetic field distribution of the annular magnet is uniform and stable, with strong and lasting magnetic force.

Through-hole ring NdFeB magnets have multiple performance and structural advantages. Firstly, the hollow through-hole design realizes the integrated function of magnetic adsorption and mechanical fixing. It can be sleeved on the fixed shaft or fixed by bolts through the through hole, with firm assembly and convenient disassembly and maintenance, which is more practical than solid magnets in shafting assembly scenarios; secondly, the annular structure forms a uniform circular closed magnetic field, which is very suitable for rotating and annular magnetic induction equipment, with concentrated magnetic field and stable induction signal; in addition, the NdFeB material has ultra-high magnetic performance, small volume and strong magnetic force, high temperature resistance and anti-demagnetization ability, and can work stably in high-temperature and high-speed rotating working environments for a long time without magnetic attenuation.

Through-hole ring NdFeB magnets are widely used in permanent magnet motors, rotating machinery equipment, automobile sensors, new energy equipment, electronic precision instruments and mechanical fixing accessories. In the motor industry, they are core magnetic components of annular motors, miniature rotating motors and generator equipment. The annular magnetic field cooperates with the shafting structure to drive the equipment to rotate stably and improve the operation efficiency of the motor; in the sensor industry, they are used for annular magnetic cores of speed sensors, angle sensors and displacement sensors, realizing accurate magnetic induction and signal transmission through the change of annular magnetic field; in mechanical equipment, they are applied to shafting fixing magnetic parts, annular positioning accessories and rotating equipment magnetic limit components; in new energy field, they serve as magnetic accessories of new energy motors and photovoltaic power generation equipment, with stable performance and long service life.

Through-hole ring NdFeB magnets support customized outer diameter, inner aperture, thickness, magnetic grade and surface treatment. Conventional specifications are in sufficient stock, and special-shaped large and small aperture ring magnets can be customized according to customer equipment parameters. The surface can be plated with zinc, nickel, epoxy resin, etc., to adapt to different working environments such as humidity, high temperature and corrosion. The product has the characteristics of high concentricity, uniform magnetic field, firm assembly, strong magnetic force and stable performance. It is a high-precision and high-cost-performance annular magnetic component, which is widely used in various industrial rotating equipment and precision assembly scenarios, and is one of the indispensable core magnetic accessories in modern industrial manufacturing.