SINTERED MAGNET, ELECTRICAL MACHINE, USE OF THE SINTERED MAGNET FOR AN ELECTRICAL MACHINE AND MANUFACTURING METHOD OF A SINTERED MAGNET

摘要

A sintered magnet (1), e.g. for an electrical machine, the sintered magnet comprising a core portion (3), a shell portion (2) arranged at an outer part of the sintered magnet, and a diffusion portion (4) arranged at least partially between the core portion and the shell portion. The shell portion (2) has a coercivity, which is at least 30 kA/m larger than the coercivity of the core portion (3). In the diffusion portion (4), the coercivity is not less than the coercivity of the core portion (3) and not larger than the coercivity of the shell portion (2) and the value of the coercivity gradually increases from the core portion (3) towards the shell portion (2). T the thickness of the core portion (3) is not less than 1 mm and the total thickness of the shell portion (2) and the diffusion portion (4) is at least 5 mm.