What is a Radial Ring Magnet

 Multi-pole ring magnets are infinitely more preferred paths for rotating machinery and magnetically coupled devices than the traditional splicing of multiple arc magnets. In addition to polar anisotropic ring magnets manufactured using multipole orientation technology, radial ring magnets, also known as radially oriented ring magnets, are the most common and proven solution for producing multipole ring magnets. Radial ring magnets can be manufactured by either a powder metallurgical process or a heat deformation process, which can then be further divided into the older repulsive orientation technique and the unique Chinese rotational orientation technique, depending on the details of how the radially oriented magnetic field is generated. Compared to rotationally oriented ring magnets, hot pressed radial ring magnets exhibit better performance by.

 

1. The thermal deformation process can produce anisotropy along the radial vector of the ring without applying a radial magnetic field, which is completely different from the powder metallurgy process.

 

2. Hot-pressed ring magnets are more suitable for small sizes, high aspect ratios or thin-walled ring magnets.

 

3. The density of rotationally oriented ring magnets is even lower than conventional sintered neodymium magnets, so their corrosion resistance cannot be compared with full-density hot-pressed magnets with lower Nd-rich phase content and nanocrystalline structure.

 

4. Rotationally oriented ring magnets are always inevitably cracked and deformed due to internal stress, so the mechanical strength is lower than that of hot-pressed magnets.

 

5. Hot-pressed ring magnets are good for saving rare earth resources and controlling product cost, with 2% lower rare earth element content than rotationally oriented ring magnets for the same magnetic property requirement, requiring less heavy rare earth elements (HREEs) to improve thermal capability. In addition, the thermal deformation process is a near-net-shape technology with relatively high material utilization.

 

6. Hot-pressed magnets provide reliable assurance of motor performance. The relevant test results show that the magnetic field intensity waveform of rotating oriented ring magnets shows an unusual dispersion and the magnetization pattern of rotating oriented ring magnets shows a strange spiral shape.

 

For the rotational orientation technology, due to its own technical defects, there is always a deviation angle of 10-20 degrees between the ideal orientation direction and the actual orientation direction, and the above abnormal waveform is more obvious when the pole width of the multi-pole ring magnet is larger.

 

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