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A permanent magnet is a material that is able to provide magnetic flux after magnetized with an applied magnetic field.
Dec 22, 2018

A permanent magnet is a material that is able to provide magnetic flux after magnetized with an applied magnetic field. The ability is characterized by two key parameters including remanence and coercivity. Generally, a permanent magnet’s intrinsic coercivity (Hcj) is higher than 300kOe (in CGS unit) or 24kA/m (in SI unit). With higher coervivity, a permanent magnet has higher ability to resist demagnetization, including field demagnetization from the electric or magnetic circuit and thermal demagnetization from the working temperature in various motors and/or electric machines applications.

A commercial permanent magnet requires relative high remanence and coercivity at affordable cost. According to material type, commercial permanent magnets include ferrite/ceramic, AlNiCo, SmCo and NdFeB magnets. According to manufacturing process type, they include sintered, cast, bonded (compressed, injected, extruded and calendered) and hot-pressed magnets


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