Neodymium Ring Magnet

Neodymium magnets are manufactured based on Nd-Fe-B alloys, and sintered neodymium magnets have the highest (BH)max value among all commercially available permanent magnets.

Neodymium ring magnets are circular in shape with a concentric hole inside. They can be classified into standard rings or countersunk rings based on the design of the inner hole. A neodymium ring magnet is typically specified by its outer diameter (O.D.), inner diameter (I.D.), and thickness (T).

Similar to neodymium disc magnets, ring magnets can be magnetized axially, with the north and south poles on opposite flat surfaces, or diametrically, with the north and south poles on opposite curved sides. In addition to these conventional magnetization types, radially oriented ring magnets are also available from Hongyu.

However, neodymium magnets are prone to corrosion under humid conditions and therefore require a protective coating.

1. Material selection: Neodymium magnets are made from an alloy of neodymium, iron, and boron, often referred to as NdFeB. The specific composition of the alloy will depend on the desired magnetic properties of the final product.
2. Cutting the raw material: The first step in machining neodymium ring magnets is to cut the raw material into the desired shape and size. This can be done using a variety of methods, such as wire EDM (electrical discharge machining) or laser cutting.
3. Grinding the material: Once the material has been cut, it is often necessary to grind it to the exact dimensions required for the final product. This is typically done using a diamond grinding wheel, which can create very precise shapes and sizes.
4. Magnetization: Once the material has been cut and ground, it must be magnetized in order to create the desired magnetic properties. This can be done using a variety of methods, such as pulse magnetization or multi-pole magnetization.
5. Inspection and testing: After the neodymium ring magnets have been magnetized, they must be inspected and tested to ensure that they meet the required specifications. This can involve measuring the magnetic field strength, as well as checking the dimensions and overall quality of the magnet.
6. Coating: Finally, neodymium ring magnets may be coated with a protective layer of nickel or other material to prevent corrosion and ensure long-lasting performance.

Overall, the process of machining neodymium ring magnets requires a high degree of precision and expertise, as even small variations in the manufacturing process can have a significant impact on the final product's magnetic properties and overall performance.

Magnetisation	Axially Magnetized	2-Poles Magnetized	Diametrically Magnetized	multi-Poles On ID	Radially magnetized	Axially Magnetized
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Magnetisation Direction

Typical available dimention and grade of Hongyu Magnetic Ring

• Electric motors → efficient rotation and energy conversion
• Speakers → stable magnetic field for sound output
• Sensors → precise signal detection
• Magnetic holding systems → compact and strong fixation

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