Permanent magnetic material, also called permanent magnet, hard magnet. Through the magnetic field magnetization and then remove the external magnetic field can keep high residual magnetism, and can withstand a certain magnetic field and other environmental factors (such as temperature and vibration etc.) interference and easy demagnetization of strong magnetic material. Using the characteristics of a magnet factory, it can be used as a magnetic source for producing a magnetic field when it requires a constant magnetic field without energy.
Magnetic assembly
The performance of the permanent magnetic material is the most comprehensive is based on various external conditions (temperature, time, radiation) under the demagnetization curve shape, but for convenience, usually only take the following three parameters to the performance of the symbol: Br, remanence coercivity Hc (including magnetic induction coercivity Hcb and the intrinsic coercive force of Hcj), and the maximum energy product (BH) m. The remanence high material is expected to obtain high energy product; Hc materials, it is difficult to reverse the domain wall displacement and domain rotation, therefore, strong anti-interference ability, to meet the same requirements (range of magnetic field data and space) under the condition of (BH) m material material at least, so the (BH) m the better value. Coercive force is one of the most basic criteria for evaluating the performance of permanent magnetic material. It is the three essential factor of permanent magnetic material, which is called remanence Br and maximum magnetic energy product (BH) M.
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