Neodymium ring magnet refers to the Neodymium magnet in the ring or donut shape. Sometimes we also call it NdFeB ring magnet, Neo magnetic ring, rare earth ring magnet or ring Neodymium magnet. This design offers unique advantages for specific applications where mounting or assembly requirements dictate the need for a centralized void. Therefore, the ring shaped magnet is very common and easy to find in many application markets.
Radially magnetized ring, diametrical ring magnet and axially magnetized ring magnet
Found in many application markets
Machining methods available to meet cost-effective order requirement
How to Describe Size of Neodymium Ring Magnet:
Generally speaking, the exact dimension for the ring magnet can be described exactly with all three related sizes, like outer diameter (OD or D), inner diameter (ID or d) and the length or thickness (L or T), for example OD55 x ID32 x T10 mm or simply as D55 x d32 x 10 mm.
Magnetization Directions of Neodymium Ring Magnet:
For Neodymium ring magnet, the production technology is more difficult or has more options than simple block shaped magnets. What production technology should be chosen depends on several factors including the strong ring magnet dimension, magnetization direction, scrap rate and then production cost at least. Based on the magnetization direction, the Neodymium magnet ring has three types like radially magnetized ring, diametrical ring magnet and axially magnetized ring magnet. Ring Neodymium magnet mainly has three types of magnetization directions, axial, diametrical and radial magnetization. Axial magnetization is easy to understand, and the magnetic lines travel through the length of the magnet. Diametrical magnetization means magnetic lines through wall thickness diametrically. Radial magnetization means magnetic lines from the circle center to the OD surface radially.
Neodymium Magnet Radial Ring:
In theory, the magnetic properties of an entire radial magnetized ring are better than the assembled ring composed of several segments diametrical magnetized in pair. But the production technology for radial ring of sintered Neodymium magnet still has many obstacles, and the sintered radial ring magnet in production has many requirement limits to lower properties, smaller size, higher scrap rate, more expensive tooling charge starting from the sampling stage, and then higher price, etc. In most applications, in the end the customers decide to use diametrical magnetized segments of sintered Neodymium magnets to form a ring or only bonded Neodymium magnet ring instead. Therefore the actual market for sintered Neodymium magnet radial ring is very small compared to the general ring or diametrically magnetized segments of Neodymium magnets.
Machining Technology and Cost of Neodymium Ring Magnet:
Generally the machining method for the outer diameter is same as that of the cylinder, and then it goes to inner diameter drilling and then slicing. If the order quantity is not big, generally the Neodymium ring magnet orientated via diameter is machined from a large rectangular magnet block rather than from a ring shaped magnet block. Although the machining cost from a block shape to a ring shape is higher, the production cost for rectangular magnet block is much lower than diametrically orientated ring or cylinder magnet.
Application of Neodymium Ring Magnet:
Neodymium ring magnets are widely used in industries such as electric motors, medical, automotive, aerospace, and power generation applications. Due to the magnetic properties of rare earth magnets, it has replaced other magnetic materials to enable smaller designs but achieve the same results. These shaped ring Neodymium magnets are widely used in engineering, manufacturing, and various consumer products, including loudspeakers, magnetic bearings, magnetic couplings, magnetic hooks, and magnetic sensors. The ring shape provides a concentrated magnetic field around the perimeter while allowing for easy mounting through the central aperture, facilitating efficient and space-saving integration into diverse systems. Ring neodymium magnets are valued for their exceptional magnetic strength, compact design, and versatility, making them indispensable in numerous industrial and commercial applications requiring precise magnetic control and performance.
Size Range of Neodymium Ring Magnet:
Normal Size Range: D (Outer Diameter): 1.5~180mm, d (Inner Diameter): 0.4~100mm, T (Thickness): 0.4~150mm
Maximum Size: D180 x d100mm x T60mm, D80 x d60 x T180mm
Minimum Size: D1.5 x d0.4 x T0.4mm
Orientation Direction Size: Lower than 80mm
Tolerance: Generally +/-0.1mm, Particularly +/-0.05mm
Magnets for PMSM (permanent magnet synchronous motors), particularly sintered Neodymium magnets (NdFeB), are integral components that determine the performance, efficiency, and reliability of PMSM motors. Neodymium magnets are essential components in modern electric motors, providing the necessary magnetic fields for efficient and powerful operation.
Precast shuttering magnet or formwork magnet is an innovative magnetic shuttering solution for precast concrete formworks! This siderail shuttering magnet makes it convenient, economic and efficient to fix the side forms and openings firmly onto steel tables and beds during the casting and vibration processes. As a China leading shuttering magnet manufacturer & supplier, Horizon Magnetics keep developing and manufacturing various shuttering magnets to help worldwide precast concrete industry solve problems caused by the traditional formwork fastening methods.
Samarium Cobalt ring magnet is the cylindrical shaped SmCo magnets with a center hole through the flat surfaces of magnets. The SmCo ring magnets are mainly used in sensors, magnetrons, high performance motors for example dental motors, microwave communication TWT (travelling wave tube), etc.
Neodymium block magnets are usually square and rectangular block shaped, which are the most common shape of Neodymium magnet. Usually we call them rare earth bar magnets, magnetic blocks, Neodymium bar magnets or rectangular Neodymium magnets. The strong block magnets are always used in industrial markets and small blocks may be used as craft magnets.
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