| 摘要 |
PURPOSE:To extract the magnetic characteristic of an Nd-Fe-B-based magnet to the full by a method wherein a magnetic yoke is arranged around a ring- shaped magnet to form a closed magnetic circuit structure, an electric current is applied to a magnetizing coil and the ring-shaped magnet is magnetized in a radial direction. CONSTITUTION:A magnetic field which is generated at the end part of a magnetizing coil 63 and which gushes out in a radial direction or a magnetic field which flows into is utilized. The intensity of the magnetic field is strong when the field 15 close to the magnetizing coil 63. When a ring-shaped magnet 1 is brought close to the magnetizing coil 63, it can be magnetized in the redial direction. A magnetic yoke 5 is arranged around the magnetizing coil 63 to form a closed magnetic circuit, and one part of the closed magnetic circuit is occupied by the ring-shaped magnet 1. By this constitution, the magnetic field in the radial direction can flow efficiently inside the closed magnetic circuit and the flow of the magnetic field can be made parallel with the ring edge of the ring-shaped magnet 1. Thereby, the ring-shaped magnet 1 can be magnetized homogeneously in the radial direction in parallel with its edge. |
