Abstract
The magnetic properties of radially-anisotropic ring-shaped magnets deteriorate when their diameter decreases, so the miniaturization of their magnet motors becomes difficult. In order to overcome this difficulty, we developed a self-organization technique of binder for anisotropic rare-earth bonded-magnets. By using this technique, we controlled the flexibility of perpendicularly-anisotropic rigid sheet-shaped magnets (approximately 1 mm in thickness), transformed them into various specific shapes, and succeeded in preparing radially-anisotropic ring-shaped magnets. In this contribution, we report a new technique which enables us to prepare an composite bonded magnet with a two-layered structure. In the magnet prepared by the developed technique, the direction of easy magnetization varies from the circumferential direction to the radial direction without deterioration of the degree of alignment. Consequently, the multi-polar magnetized magnets observed a smooth flux waveform and the initial irreversible flux loss reduction compared with that of conventional radially anisotropic magnets.
