Arc ferrite magnet

When selecting Arc Ferrite Magnets (also known as Ceramic Magnets), you must prioritize Magnetic Grade (e.g., Y30, Y35, C8, C12), which determines the Remanence (Br) and Coercivity (Hcb/Hcj). For high-performance motors, ensure the Intrinsic Coercivity (Hcj) is high enough to resist demagnetization at elevated temperatures. Additionally, specify the Dimensional Tolerances (typically +/- 0.1mm to 0.2mm) and the Magnetization Direction (usually radial or diametrical for arc shapes) to ensure compatibility with your rotor or stator design.

Ferrite magnets are inherently corrosion-resistant and do not require plating, but you should verify their Thermal Stability. Standard ferrites can operate up to 250°C, but their magnetic properties change with temperature. Request Demagnetization Curves (B-H Curves) at different temperatures from the supplier. For mechanical durability, check for surface defects like cracks or chips, as ferrite is brittle; ensure the supplier follows ISO 9001 or IATF 16949 standards for consistent manufacturing processes.

Arc Ferrite Magnets are primarily used in DC Motors, Automotive Starters, Power Tools, and Brushless Motors (BLDC). The functional requirement is to provide a stable magnetic field within a curved geometry. You should evaluate the Flux Density consistency across a batch to ensure uniform motor torque and efficiency. For high-speed applications, the concentricity and weight balance of the arc segments are critical to prevent vibration.

The main risks include breakage during transit due to brittleness and shipping delays caused by magnetic interference with aircraft instruments. To mitigate this, ensure the supplier uses Professional Magnetic Shielding Packaging (iron sheets and foam) if shipping by air. For sea freight, verify that the Palletization is robust. Always use Made-in-China.com's Secured Trading services to protect your payment until the goods pass a third-party inspection for cracks and magnetic strength.

Ferrite magnets are raw-material intensive (Iron Oxide and Strontium Carbonate). Negotiate based on Raw Material Index Pricing to ensure transparency. Since arc magnets require Specific Molds, expect a Tooling Fee for custom dimensions. To lower the unit price, aim for an MOQ of 5,000 to 10,000 pieces, as the setup time for hydraulic presses is significant. Ask for a Sample Run first to verify the mold precision before committing to mass production.

Ensure the products comply with RoHS and REACH directives, especially if exporting to the EU, to certify the absence of hazardous substances. For US-bound shipments, be aware of Section 301 tariffs if applicable. Always request a Certificate of Analysis (COA) and a Magnetic Property Report for every batch. When sourcing via Made-in-China.com, prioritize Audited Suppliers who have undergone on-site factory inspections to verify their production capacity and export licenses.