Ferrite Arc Magnet

Magnetic ceramics, also known as ferrites, are composite oxide magnetic materials composed of iron ions, oxygen ions, and other metal ions, although some magnetic oxides may not contain iron. Based on their applications, ferrites can be classified into soft magnetic, hard magnetic, gyromagnetic, moment magnetic, and piezomagnetic materials. Among these, soft magnetic ceramics are the most diverse and widely used, characterized by high initial permeability, easy magnetization, and easy demagnetization.

A ferrite arc magnet, also known as an arc ferrite magnet or ferrite segment magnet, is a type of sintered ceramic permanent magnet made from iron oxide combined with barium or strontium carbonate. It is produced through a powder metallurgy process and formed into curved segments to match motor assemblies.

• DC motors
• Automotive motors
• Household appliances (fans, pumps, washing machines)
• Power tools and generators

These magnets are essential components in motor systems where durability and cost control are critical.

The porous insulating substance known as ferrite magnet is made up of many grains and pores. It is nearly hard to manufacture sintered ferrite magnets in nearly net-shape, hence special machining is required. Due to its hardness and fragility, ferrite magnets can only be machined using the grinding, slicing, and polishing processes to meet the required levels of dimensional precision, geometric tolerance, and roughness. The block, disc, ring, and segment shapes of ferrite magnets are the most typical ones; therefore, the magnet maker must choose an appropriate machining process in accordance with product specifications. The wire-cutting procedure is not appropriate to ferrite magnets, unlike Neodymium arc magnets or SmCo arc magnets with strong conductivity, hence its machining is primarily carried out using copy grinding technology.

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