| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method for a permanent magnet built-in type rotor, which has a permanent magnet that prevents degradation in magnetic characteristics of the iron core of the rotor even when an intermediate molded body to be formed as a permanent magnet is sintered with the whole rotor, and that is able to ensure the maximum volume by adhering to the hole of the iron core.SOLUTION: A manufacturing method for a permanent magnet built-in type rotor 100 comprises: a magnetic particle filling step in which un-magnetized particles 32 is filled in holes 12 of an iron core 1, for a permanent magnet; a magnetization facilitation axis adjustment step in which the magnetization facilitation axes of magnetic particles 32 are aligned by applying a magnetic field to the iron core 1 by magnetic field generating means 39 from outside; a pressure application step in which the magnetic particles 32 filled in the holes 12 after the magnetization facilitation axis adjustment step are compressed in the axial direction, thereby forming an intermediate molded body 52 in the iron core 1; a sinter step in which the iron core 1 containing the intermediate molded body 52 is sintered at 900°C or below in a vacuum or inactive gas while applying pressure to it in the axial direction, thereby composing a sinter body 62; and a magnetization step in which the sinter body 62 is magnetized while being contained in the iron core 1, thereby composing a permanent magnet 2. |
