The magnet may be divided into two categories: one is the eternal magnet - hard magnetic magnet magnetic dispensable - soft magnets. Types of hard magnet, NdFeB, ferrite, Alnico, SmCo. Which is divided into NdFeB magnets, sintered and bonded to two kinds.

      The following are some of the characteristics of the magnet.

      Ferrite low, the lowest price, good temperature characteristics, corrosion resistance, good performance and low cost

      Sintered NdFeB magnets highest performance, price, good strength, high temperature and corrosion

      Samarium cobalt high performance, the highest price, crisp, excellent temperature characteristics, corrosion resistance

      Alnico low performance, in terms of price, excellent temperature characteristics, corrosion resistance, differential interference

       Samarium cobalt, ferrite, NdFeB sintered and bonded method, high sintered magnet, bonded magnet formed poor moldability, good performance degradation.

      Alnico casting and sintering method can manufacture high performance cast magnet, good formability poor, low sintered magnet, formability is better.