Rare Earth Arc Magnets

A useful quotation begins with a complete drawing. The drawing should show outer diameter, inner diameter, thickness, arc angle, chord length, and tolerance. If the magnet sits inside a rotor or stator, the assembly method also matters. Will it be glued, overmolded, pressed, or mechanically locked? Each method changes the recommended tolerance and coating. Buyers who send only a photo or a sample often receive slower replies because the factory must reverse-engineer the geometry before quoting.

Working conditions should be stated at the same time. Include ambient temperature, peak temperature, humidity, salt exposure, reverse field risk, and expected service life. These details decide whether a standard NdFeB grade is enough or whether a high-coercivity grade, samarium cobalt, alnico, or another material is needed. Our plant produces multiple magnet series, so the recommendation is based on the application, not on a single inventory item.

For rare earth arc magnets, the alloy route should be based on temperature and demagnetization risk. Sintered NdFeB covers N30 to N55, including M, H, SH, UH, EH, and AH grades. Maximum remanence can reach 1.5T. This suits compact motors, sensors, and high-torque assemblies where space is limited. When heat is higher, samarium cobalt can work up to 350°C. Alnico can reach 600°C in some designs. Ferrite and rubber magnet options may fit lower-cost or flexible projects, even though they are not rare-earth materials.

Raw material control is strict. We use high-purity material from listed large-scale suppliers, with purity ≥95%. Recycled material is not used. In heavy rare earth addition, we use dysprosium-iron rather than low-cost holmium-iron. This improves high-temperature stability and batch consistency. The result is stronger resistance to demagnetization and more predictable performance across production lots.

Arc magnets are custom parts, so tooling and machining discipline decide whether the batch fits. We control dimensional tolerance to 0.01mm and produce sizes from 0.2mm to 150mm, including thin arcs and irregular profiles. Magnetization can be radial, axial, or multi-pole. If the arc is very thin, special support may be needed during slicing and coating to reduce chips and cracks. Our engineers review the drawing before production and suggest changes only when they improve yield without harming magnetic performance.

Bare NdFeB is not suitable for many humid or salty environments. We apply a nickel-copper-nickel three-layer electroplating process. The single nickel layer can reach 5μm, with uniform color and strong adhesion. Other coatings include zinc, epoxy, gold, and silver. The automatic plating line is environmentally compliant. Coatings can pass SGS 300+ item testing and meet REACH, RoHS, CP65, and EN71. This helps buyers ship to Europe, North America, Japan, and Korea with fewer market-access problems. The factory is also certified to IATF16949 and ISO9001, which supports automotive and industrial supply chains.

A curved magnet may pass the first sample and still fail in mass production if the process is not controlled. Every lot is checked for chemical composition, dimensions, magnetic flux, and salt spray performance. We use X-ray thickness gauges, high-temperature test chambers, and HAST accelerated aging testers. Inspection data is recorded by lot number and can be reviewed during customer audits. Batch magnetic fluctuation is kept small, and demagnetization rate is lower than the industry average. For projects that need PPAP, material certificates, or additional test reports, the documents can be discussed during the RFQ stage.

Arc magnets can chip or crack if packed poorly. We use 8-hole thickened inner boxes plus outer cartons. The double-layer design protects against shock, scratches, and rust during long-distance transport. Free small samples are available for evaluation. Small-batch trial production and fast prototyping are supported. Lead times are stable, and multiple payment methods are accepted. Technical support is free, including magnetic circuit design, material selection, and application review. After-sales response is timely.

To request a quotation for rare earth arc magnets, send your drawing, material preference, grade, coating, magnetization direction, working temperature, and estimated quantity. Our engineering team will review the details and reply with a practical solution.

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Email: zb16@magnets-world.com

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