CYLINDRICAL PERMANENT MAGNET DEVICE GENERATING A CONTROLLED MAGNETIC FIELD AT A DISTANCE FROM THE SURFACE THEREOF

摘要

The invention relates to a cylindrical permanent magnetic device comprising at least one base structure (10) having a longitudinal axis (z) and a set (20) of coaxial magnetised structures (21, 22, 23, 24) in the form of non-jointed crowns having the longitudinal axis (z) as the axis thereof, and arranged on the same side of the base structure (10) by defining an outer surface perpendicular to the longitudinal axis (z) for producing a magnetic field (B0) outside the magnet device in an external zone of interest (3) arranged at a pre-determined distance from the outer surface along the longitudinal axis (z). The at least one of the coaxial magnetised structures (21, 22, 23, 24) in the form of a crown is divided into constitutive elements in the form of non-jointed identical sectors. The base structure (10) and the set (20) of coaxial magnetised structures (21, 22, 23, 24) in the form of crowns are magnetised in the same direction (M) in such a way as to create, in the outer zone of interest (3), an induced magnetic field (B0) that is homogeneous or has a constant gradient, and is oriented by the formation of a pre-determined angle (T2) in relation to the longitudinal axis (z).