| 摘要 |
PURPOSE:To achieve collective magnetization to provide a high surface magnetic field in a short time and enable durability of a magnetizer to be improved by performing electromagnetic induction heating of a rare earth alloy magnet and then magnetizing it while a coercive force (iHc) is in a specific state. CONSTITUTION:After mixing an Nd-Fe-B rapid-cooling thin-band ground magnetic powder, epoxy resin which is in liquid at room temperature, and a curing agent, they are subjected to compression molding and are heated, and the epoxy resin is cured, thus obtaining plastic magnetic ring. A 6-turn ring-shaped coil is used for high-frequency induction heating, heating is made for a specified amount of time, and then immediately magnetization is made below 9kOe using a commercial magnetizer. The commercial magnetizer is in general an outer- periphery collective magnetizer which is produced by manufactures of electromagnetic equipment and consists of an air core 3 at a part where a magnetization yoke 1, a coil 2, and a body to be magnetized are set. The iHc of the body to be magnetized is small, namely below 9kOe, thus achieving full magnetization even if magnetizing magnetic field is small. |
