Disc Permanent Magnet Manufacturers

1. What is a Disc Permanent Magnet?
A disc permanent magnet is a special type of permanent magnet. As the name suggests, a permanent magnet is a material that maintains its magnetism for a long time without external magnetic field excitation. Common permanent magnet materials include alloy permanent magnets (such as rare earth permanent magnets such as neodymium iron boron (Nd₂Fe₁₄B), samarium cobalt (SmCo), and aluminum nickel cobalt (AlNiCo)) as well as ferrite permanent magnets. Disc permanent magnets, with their disc-like shape, offer unique advantages in certain applications. For example, in ironless disc permanent magnet motors, disc permanent magnets are often used in the rotor, generating torque through the interaction of their magnetic field with the current in the stator windings.

2. Characteristics of Disc Permanent Magnets
2.1 High Magnetic Properties
Take the widely used NdFeB disc permanent magnet as an example. NdFeB is one of the most powerful permanent magnet materials currently available, boasting high remanence (Br), high coercivity (Hc), and a high maximum energy product (BH)m. This means disc permanent magnets can generate a strong magnetic field and maintain their magnetism despite external interference, ensuring stable operation. In motor applications, this strong magnetic field effectively increases the motor's power density, enabling it to output greater power within a smaller footprint.
2.2 Advantages of Shape
The disc shape makes it ideal for applications with specific spatial requirements. Compared to traditional cylindrical or block permanent magnets, disc permanent magnets can be more easily installed flat, saving space. In electronic products requiring a thin and lightweight design, such as small speakers and hard disk drives, disc permanent magnets better meet the demand for compact structures.

3. Applications of Disc Permanent Magnets
3.1 Motors
Disc permanent magnets play a key role in coreless disc permanent magnet motors. They offer advantages such as low losses (the ironless structure eliminates iron losses, i.e., hysteresis and eddy current losses, resulting in higher efficiency at high frequencies), high power density (the disc design increases the effective electromagnetic area, providing greater torque), low torque ripple (no cogging, resulting in smooth torque output, suitable for high-dynamic performance applications), lightweight (the ironless structure reduces motor weight and moment of inertia, improving dynamic response), and efficient heat dissipation (the windings are directly exposed to air or a cooling medium). These advantages are all made possible by the properties of disc permanent magnets. These motors are widely used in aerospace (such as drones, electric aircraft, and spacecraft, leveraging their lightweight and high efficiency), electric vehicles (using in-wheel motors or powertrains to provide efficient and compact power solutions), wind power generation (suitable for small and medium-sized wind turbines due to their high power density and low losses), and industrial robotics (smooth torque output and fast dynamic response, suitable for high-precision motion control). 3.2 Electronic Equipment
Disk permanent magnets also have numerous applications in consumer electronics. For example, in mobile phone vibration motors, disk permanent magnets work in conjunction with coils to generate vibrations through electromagnetic force. In hard disk drives, disk permanent magnets drive the magnetic head, precisely controlling its position and enabling fast data reading and writing. In small speakers, the magnetic field generated by disk permanent magnets interacts with the voice coil, driving the diaphragm to vibrate, thereby producing sound.

4. Industry Development and Related Companies – Taking Ningbo Jinlun Magnet Technology Co., Ltd. as an Example
Ningbo Jinlun Magnet Technology Co., Ltd. is a highly influential company in the permanent magnet manufacturing industry. It specializes in the research, development, production, and sales of high-performance rare earth permanent magnet materials and is a technologically innovative enterprise. Equipped with advanced permanent magnet production equipment and robust blank production capabilities, it is capable of producing a wide range of permanent magnet products, including disk permanent magnets.
In terms of technological research and development, the company continuously invests in the technical research of high-tech products. For example, the company has mastered a variety of core technologies, including THPC (high-performance CeFeb) technology, which uses the highly abundant rare earth element cerium to replace neodymium. This technology reduces costs and balances the use of rare earth resources while maintaining high performance and corrosion resistance. GBD (Grain Boundary Diffusion) technology distributes low concentrations of heavy rare earth elements at grain boundaries, improving grain boundary defects and significantly increasing intrinsic coercivity (Hcj). TPR (Grain Refinement Process) refines grain size to 2.5-3 microns without adding heavy rare earths, optimizing the microstructure and significantly improving Hcj, effectively enhancing product competitiveness. J-LOP (Jinlun Low Oxygen Process) ensures comprehensive oxygen control throughout the entire production process, keeping the oxygen content in magnets below 500 ppm, effectively preventing rare earth phase oxidation and significantly improving product performance and consistency.

In terms of raw material supply, the company has established a stable supply system. By diversifying its supplier base, establishing a core supplier + backup supplier tier system, and building regional and cross-border supply networks, the company leverages digital tools such as intelligent supply chain systems, integrated ERP-SCM management, and the use of IoT and big data to predict supply and demand fluctuations to ensure a stable supply of raw materials. Furthermore, through centralized procurement, strategic partnerships and long-term supply agreements with high-quality mines and smelters, and vertical integration of the supply chain (extending to upstream rare earth separation and metal purification), the company reduces raw material costs and ensures stable product prices, quality, and supply. These advantages ensure that the quality and performance of products such as disc permanent magnets are guaranteed from the source.