What Are Diametric Magnets? All Related

Diametric magnets usually refer to magnets magnetized in the diameter direction, with strong magnetic surfaces on the sides. They are generally circular, ring-shaped, cylindrical, or cylindrical with through holes. Today, let's talk about this type of magnet.

First, in terms of material, various materials can be used, primarily including neodymium iron boron, ferrite, and samarium cobalt. Among these, neodymium is the most commonly used material, especially in applications requiring strong magnetic fields; ferrite has significantly weaker magnetic properties than neodymium iron boron but exhibits better stability in high-temperature and humid environments; samarium cobalt offers superior corrosion resistance and is suitable for use in harsh environments; it is more expensive and has weaker magnetic properties than neodymium iron boron.

Through diameter magnetized cylindrical neodymium magnets

Examples of common sizes for diametric magnets;

Diameter 1 mm, thickness 0.5 mm, 1 mm, 2 mm

Diameter 2 mm, thickness 1 mm, 2 mm, 3 mm

Diameter 3 mm, thickness 2 mm, 3 mm, 5 mm, 6 mm

Diameter 5 mm, thickness 2 mm, 5 mm

Diameter 8 mm, thickness 2 mm, 5 mm

Diameter 10mm, thickness 2mm, 5mm, 10mm

Diameter 20mm, thickness 3mm, 5mm, 10mm, 20mm

Diameter 50-100mm, thickness 10-30mm

Sample：

1mm thick radial rare-earth neodymium magnetic ring 29x18x1mm

Radial ferrite magnets

Diametrically magnetized magnets

Performance characteristics of diametric magnets:

Magnetic field direction distributed transversely, suitable for motor coil winding induction;

More uniform magnetic field distribution (especially multi-pole magnetization);

Enables precise induction during high-speed rotation, reducing vibration;

Can be used for non-contact angle, position, and speed detection;

Typical applications of diametric magnets;

It is mainly used in the fields of motors, sensors, and encoders. For example, in brushless DC motor rotors, multi-pole radial magnetized magnetic rings are core components. The arc-shaped segmented magnets and arc-shaped magnetic blocks in the rotor are radially magnetized to form a closed magnetic ring. In magnetic encoders, angle and speed information is obtained by detecting multi-pole magnetic pole signals.

The main difference between diameter magnets and axial magnets lies in their different magnetization methods, which results in differences in their magnetic field distribution, applicable scenarios, processing difficulty, and price. For more details, please click: Axially magnetized vs diametrically magnetized

If you need to select diameter magnetized magnets for your actual project, we recommend that you prioritize neodymium iron boron (sintered or bonded) or ferrite (sintered or injection molded) materials, and clearly specify the number of magnetic poles and polarity distribution requirements (such as 12 poles evenly distributed), as well as the surface magnetic field strength requirements.

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