- Outer diameter: The diameter of the ring magnet.
- Inner diameter: The diameter of the center hole of the ring magnet.
- Thickness: The thickness of the ring magnet.
- Magnetization direction: The direction of the magnetic field in the ring magnet.
- Neodymium iron boron (NdFeB): The strongest magnetic material, but it is also the most susceptible to corrosion and requires surface treatment.
- Ferrite: Lower cost, but weaker magnetic force, suitable for low-cost applications.
- Samarium cobalt (SmCo): High coercivity, high temperature and corrosion resistance, but expensive.
- Magnetic force: The strength of the magnetic field of the ring magnet, measured in gauss or tesla. Usually represented by surface magnetic field (Br) or magnetic flux density (B).
- Coercivity: The ability of the ring magnet to resist demagnetization by an external magnetic field. Unit is oersted.
- Remanence: The magnetic field remaining in the ring magnet after the external magnetic field is removed. Unit is gauss or tesla.
- Working temperature: The temperature range at which the ring magnet can operate normally.
Product specifications: Outer diameter 88 mm, inner diameter 75 mm, thickness 3 mm, material: neodymium iron boron
Case description:This D88-D75x3 NdFeB ring magnet is used in MRI equipment to generate strong magnetic fields. It improves image quality, reduces scan time, and makes equipment more compact.
Conclusion
Ring magnets, with their unique shape and magnetic properties, play a crucial role in diverse fields. The three case studies demonstrate their applications in motors, sensors, and medical devices, each highlighting different considerations for choosing the right ring magnet. When selecting a ring magnet, comprehensively assess your application needs, material characteristics, size & strength, and magnetization direction to achieve optimal results.
